<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Mapping;

use Doctrine\Common\DoctrineException;

/**
 * A <tt>ClassMetadata</tt> instance holds all the object-relational mapping metadata
 * of an entity and it's associations.
 * 
 * Once populated, ClassMetadata instances are usually cached in a serialized form.
 *
 * <b>IMPORTANT NOTE:</b>
 *
 * The fields of this class are only public for 2 reasons:
 * 1) To allow fast READ access.
 * 2) To drastically reduce the size of a serialized instance (private/protected members
 *    get the whole class name, namespace inclusive, prepended to every property in
 *    the serialized representation).
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
final class ClassMetadata
{
    /* The inheritance mapping types */
    /**
     * NONE means the class does not participate in an inheritance hierarchy
     * and therefore does not need an inheritance mapping type.
     */
    const INHERITANCE_TYPE_NONE = 1;
    /**
     * JOINED means the class will be persisted according to the rules of
     * <tt>Class Table Inheritance</tt>.
     */
    const INHERITANCE_TYPE_JOINED = 2;
    /**
     * SINGLE_TABLE means the class will be persisted according to the rules of
     * <tt>Single Table Inheritance</tt>.
     */
    const INHERITANCE_TYPE_SINGLE_TABLE = 3;
    /**
     * TABLE_PER_CLASS means the class will be persisted according to the rules
     * of <tt>Concrete Table Inheritance</tt>.
     */
    const INHERITANCE_TYPE_TABLE_PER_CLASS = 4;
    
    /* The Id generator types. */
    /**
     * AUTO means the generator type will depend on what the used platform prefers.
     * Offers full portability.
     */
    const GENERATOR_TYPE_AUTO = 1;
    /**
     * SEQUENCE means a separate sequence object will be used. Platforms that do
     * not have native sequence support may emulate it. Full portability is currently
     * not guaranteed.
     */
    const GENERATOR_TYPE_SEQUENCE = 2;
    /**
     * TABLE means a separate table is used for id generation.
     * Offers full portability.
     */
    const GENERATOR_TYPE_TABLE = 3;
    /**
     * IDENTITY means an identity column is used for id generation. The database
     * will fill in the id column on insertion. Platforms that do not support
     * native identity columns may emulate them. Full portability is currently
     * not guaranteed.
     */
    const GENERATOR_TYPE_IDENTITY = 4;
    /**
     * NONE means the class does not have a generated id. That means the class
     * must have a natural id.
     */
    const GENERATOR_TYPE_NONE = 5;
    /**
     * DEFERRED_IMPLICIT means that changes of entities are calculated at commit-time
     * by doing a property-by-property comparison with the original data. This will
     * be done for all entities that are in MANAGED state at commit-time.
     *
     * This is the default change tracking policy.
     */
    const CHANGETRACKING_DEFERRED_IMPLICIT = 1;
    /**
     * DEFERRED_EXPLICIT means that changes of entities are calculated at commit-time
     * by doing a property-by-property comparison with the original data. This will
     * be done only for entities that were explicitly saved (through save() or cascade).
     */
    const CHANGETRACKING_DEFERRED_EXPLICIT = 2;
    /**
     * NOTIFY means that Doctrine relies on the entities sending out notifications
     * when their properties change. Such entity classes must implement
     * the <tt>NotifyPropertyChanged</tt> interface.
     */
    const CHANGETRACKING_NOTIFY = 3;

    /**
     * The name of the entity class.
     */
    public $name;

    /**
     * The namespace the entity class is contained in.
     *
     * @var string
     */
    public $namespace;

    /**
     * The name of the entity class that is at the root of the entity inheritance
     * hierarchy. If the entity is not part of an inheritance hierarchy this is the same
     * as $_entityName.
     *
     * @var string
     */
    public $rootEntityName;

    /**
     * The name of the custom repository class used for the entity class.
     * (Optional).
     *
     * @var string
     */
    public $customRepositoryClassName;
    
    /**
     * Whether this class describes the mapping of a mapped superclass.
     * 
     * @var boolean
     */
    public $isMappedSuperclass = false;

    /**
     * The names of the parent classes (ancestors).
     * 
     * @var array
     */
    public $parentClasses = array();

    /**
     * The names of all subclasses.
     * 
     * @var array
     */
    public $subClasses = array();

    /**
     * The field names of all fields that are part of the identifier/primary key
     * of the mapped entity class.
     *
     * @var array
     */
    public $identifier = array();
    
    /**
     * The inheritance mapping type used by the class.
     *
     * @var integer
     */
    public $inheritanceType = self::INHERITANCE_TYPE_NONE;
    
    /**
     * The Id generator type used by the class.
     *
     * @var string
     */
    public $generatorType = self::GENERATOR_TYPE_NONE;
    
    /**
     * The field mappings of the class.
     * Keys are field names and values are mapping definitions.
     *
     * The mapping definition array has the following values:
     * 
     * - <b>fieldName</b> (string)
     * The name of the field in the Entity. 
     * 
     * - <b>type</b> (object Doctrine\DBAL\Types\* or custom type)
     * The type of the column. Can be one of Doctrine's portable types
     * or a custom type.
     * 
     * - <b>columnName</b> (string, optional)
     * The column name. Optional. Defaults to the field name.
     * 
     * - <b>length</b> (integer, optional)
     * The database length of the column. Optional. Default value taken from
     * the type.
     * 
     * - <b>id</b> (boolean, optional)
     * Marks the field as the primary key of the Entity. Multiple fields of an
     * entity can have the id attribute, forming a composite key.
     * 
     * - <b>idGenerator</b> (string, optional)
     * Either: idGenerator => 'nameOfGenerator', usually only for TABLE/SEQUENCE generators
     * Or: idGenerator => 'identity' or 'auto' or 'table' or 'sequence'
     * Note that 'auto', 'table', 'sequence' and 'identity' are reserved names and
     * therefore cant be used as a generator name!
     * 
     * - <b>nullable</b> (boolean, optional)
     * Whether the column is nullable. Defaults to FALSE.
     * 
     * - <b>columnDefinition</b> (string, optional, schema-only)
     * The SQL fragment that is used when generating the DDL for the column.
     * 
     * - <b>precision</b> (integer, optional, schema-only)
     * The precision of a decimal column. Only valid if the column type is decimal.
     * 
     * - <b>scale</b> (integer, optional, schema-only)
     * The scale of a decimal column. Only valid if the column type is decimal.
     * 
     * - <b>index (string, optional, schema-only)</b>
     * Whether an index should be generated for the column.
     * The value specifies the name of the index. To create a multi-column index,
     * just use the same name for several mappings.
     * 
     * - <b>foreignKey (string, optional, schema-only)</b>
     *
     * @var array
     */    
    public $fieldMappings = array();
    
    /**
     * An array of field names. Used to look up field names from column names.
     * Keys are column names and values are field names.
     * This is the reverse lookup map of $_columnNames.
     *
     * @var array
     */
    public $fieldNames = array();

    /**
     * A map of field names to column names. Keys are field names and values column names.
     * Used to look up column names from field names.
     * This is the reverse lookup map of $_fieldNames.
     *
     * @var array
     */
    public $columnNames = array();
    
    /**
     * A map of column names as they appear in an SQL result set to column names as they
     * are defined in the mapping. This includes the columns of all mapped fields as well
     * as any join columns and discriminator columns.
     * 
     * @var array
     */
    public $resultColumnNames = array();

    /**
     * Whether to automatically OUTER JOIN subtypes when a basetype is queried.
     *
     * <b>This does only apply to the JOINED inheritance mapping strategy.</b>
     *
     * @var boolean
     */
    //public $joinSubclasses = true;

    /**
     * The discriminator value of this class.
     *
     * <b>This does only apply to the JOINED and SINGLE_TABLE inheritance mapping strategies
     * where a discriminator column is used.</b>
     *
     * @var mixed
     * @see _discriminatorColumn
     */
    public $discriminatorValue;
    
    /**
     * The discriminator map of all mapped classes in the hierarchy.
     *
     * <b>This does only apply to the JOINED and SINGLE_TABLE inheritance mapping strategies
     * where a discriminator column is used.</b>
     *
     * @var mixed
     * @see _discriminatorColumn
     */
    public $discriminatorMap = array();

    /**
     * The definition of the descriminator column used in JOINED and SINGLE_TABLE
     * inheritance mappings.
     *
     * @var array
     */
    public $discriminatorColumn;

    /**
     * The primary table definition. The definition is an array with the
     * following entries:
     *
     * name => <tableName>
     * schema => <schemaName>
     * indexes => array
     * uniqueConstraints => array
     *
     * @var array
     */
    public $primaryTable;

    /**
     * The registered lifecycle callbacks for entities of this class.
     *
     * @var array
     */
    public $lifecycleCallbacks = array();
    
    /**
     * The association mappings. All mappings, inverse and owning side.
     *
     * @var array
     */
    public $associationMappings = array();
    
    /**
     * List of inverse association mappings, indexed by mappedBy field name.
     *
     * @var array
     */
    public $inverseMappings = array();
    
    /**
     * Flag indicating whether the identifier/primary key of the class is composite.
     *
     * @var boolean
     */
    public $isIdentifierComposite = false;

    /**
     * The ReflectionClass instance of the mapped class.
     *
     * @var ReflectionClass
     */
    public $reflClass;

    /**
     * The ReflectionProperty instances of the mapped class.
     *
     * @var array
     */
    public $reflFields = array();

    /**
     * The ID generator used for generating IDs for this class.
     *
     * @var AbstractIdGenerator
     */
    public $idGenerator;

    /**
     * The definition of the sequence generator of this class. Only used for the
     * SEQUENCE generation strategy.
     *
     * @var array
     */
    public $sequenceGeneratorDefinition;

    /**
     * The definition of the table generator of this class. Only used for the
     * TABLE generation strategy.
     *
     * @var array
     */
    public $tableGeneratorDefinition;

    /**
     * The policy used for change-tracking on entities of this class.
     *
     * @var integer
     */
    public $changeTrackingPolicy = self::CHANGETRACKING_DEFERRED_IMPLICIT;

    /**
     * The SQL INSERT string for entities of this class.
     *
     * @var string
     */
    public $insertSql;

    /**
     * A map of field names to class names, where the field names are association
     * fields that have been inherited from another class and values are the names
     * of the classes that define the association.
     *
     * @var array
     */
    public $inheritedAssociationFields = array();

    /**
     * A flag for whether or not instances of this class are to be versioned with optimistic locking.
     *
     * @var boolean $isVersioned
     */
    public $isVersioned;

    /**
     * The name of the field which is used for versioning in optimistic locking (if any).
     *
     * @var mixed $versionField
     */
    public $versionField;

    /**
     * Initializes a new ClassMetadata instance that will hold the object-relational mapping
     * metadata of the class with the given name.
     *
     * @param string $entityName The name of the entity class the new instance is used for.
     */
    public function __construct($entityName)
    {
        $this->name = $entityName;
        $this->reflClass = new \ReflectionClass($entityName);
        $this->namespace = $this->reflClass->getNamespaceName();
        $this->primaryTable['name'] = $this->reflClass->getShortName();
        $this->rootEntityName = $entityName;
    }

    /**
     * Gets the ReflectionClass instance of the mapped class.
     *
     * @return ReflectionClass
     */
    public function getReflectionClass()
    {
        return $this->reflClass;
    }

    /**
     * Gets the ReflectionPropertys of the mapped class.
     *
     * @return array An array of ReflectionProperty instances.
     */
    public function getReflectionProperties()
    {
        return $this->reflFields;
    }

    /**
     * Gets the change tracking policy used by this class.
     *
     * @return integer
     */
    public function getChangeTrackingPolicy()
    {
        return $this->changeTrackingPolicy;
    }

    /**
     * Sets the change tracking policy used by this class.
     *
     * @param integer $policy
     */
    public function setChangeTrackingPolicy($policy)
    {
        $this->changeTrackingPolicy = $policy;
    }

    /**
     * Whether the change tracking policy of this class is "deferred explicit".
     *
     * @return boolean
     */
    public function isChangeTrackingDeferredExplicit()
    {
        return $this->changeTrackingPolicy == self::CHANGETRACKING_DEFERRED_EXPLICIT;
    }

    /**
     * Whether the change tracking policy of this class is "deferred implicit".
     *
     * @return boolean
     */
    public function isChangeTrackingDeferredImplicit()
    {
        return $this->changeTrackingPolicy == self::CHANGETRACKING_DEFERRED_IMPLICIT;
    }

    /**
     * Whether the change tracking policy of this class is "notify".
     *
     * @return boolean
     */
    public function isChangeTrackingNotify()
    {
        return $this->changeTrackingPolicy == self::CHANGETRACKING_NOTIFY;
    }

    /**
     * INTERNAL:
     * Adds a reflection property. Usually only used by the ClassMetadataFactory
     * while processing inheritance mappings.
     *
     * @param array $props
     */
    public function addReflectionProperty($propName, \ReflectionProperty $property)
    {
        $this->reflFields[$propName] = $property;
    }

    /**
     * Gets a ReflectionProperty for a specific field of the mapped class.
     *
     * @param string $name
     * @return ReflectionProperty
     */
    public function getReflectionProperty($name)
    {
        return $this->reflFields[$name];
    }

    /**
     * Gets the ReflectionProperty for the single identifier field.
     *
     * @return ReflectionProperty
     * @throws DoctrineException If the class has a composite identifier.
     */
    public function getSingleIdReflectionProperty()
    {
        if ($this->isIdentifierComposite) {
            throw DoctrineException::singleIdNotAllowedOnCompositePrimaryKey();
        }
        return $this->reflFields[$this->identifier[0]];
    }

    /**
     * Gets the name of the mapped class.
     *
     * @return string
     */
    public function getClassName()
    {
        return $this->name;
    }

    /**
     * Gets the name of the class in the entity hierarchy that owns the field with
     * the given name. The owning class is the one that defines the field.
     *
     * @param string $fieldName
     * @return string
     */
    public function getOwningClass($fieldName)
    {
        if ($this->inheritanceType == self::INHERITANCE_TYPE_NONE) {
            return $this->name;
        } else {
            $mapping = $this->getFieldMapping($fieldName);
            return $mapping['inherited'];
        }
    }

    /**
     * Gets the name of the root class of the mapped entity hierarchy. If the entity described
     * by this ClassMetadata instance is not participating in a hierarchy, this is the same as the
     * name returned by {@link getClassName()}.
     *
     * @return string The name of the root class of the entity hierarchy.
     */
    public function getRootClassName()
    {
        return $this->rootEntityName;
    }

    /**
     * Checks whether a field is part of the identifier/primary key field(s).
     *
     * @param string $fieldName  The field name
     * @return boolean  TRUE if the field is part of the table identifier/primary key field(s),
     *                  FALSE otherwise.
     */
    public function isIdentifier($fieldName)
    {
        if ( ! $this->isIdentifierComposite) {
            return $fieldName === $this->identifier[0];
        }
        return in_array($fieldName, $this->identifier);
    }

    /**
     * Checks if the class has a composite identifier.
     *
     * @param string $fieldName  The field name
     * @return boolean  TRUE if the identifier is composite, FALSE otherwise.
     */
    public function isIdentifierComposite()
    {
        return $this->isIdentifierComposite;
    }

    /**
     * Check if the field is unique.
     *
     * @param string $fieldName  The field name
     * @return boolean  TRUE if the field is unique, FALSE otherwise.
     */
    public function isUniqueField($fieldName)
    {
        $mapping = $this->getFieldMapping($fieldName);
        if ($mapping !== false) {
            return isset($mapping['unique']) && $mapping['unique'] == true;
        }
        return false;
    }

    /**
     * Check if the field is not null.
     *
     * @param string $fieldName  The field name
     * @return boolean  TRUE if the field is not null, FALSE otherwise.
     */
    public function isNullable($fieldName)
    {
        $mapping = $this->getFieldMapping($fieldName);
        if ($mapping !== false) {
            return isset($mapping['nullable']) && $mapping['nullable'] == true;
        }
        return false;
    }

    /**
     * Gets a column name for a field name.
     * If the column name for the field cannot be found, the given field name
     * is returned.
     *
     * @param string $fieldName The field name.
     * @return string  The column name.
     */
    public function getColumnName($fieldName)
    {
        return isset($this->columnNames[$fieldName]) ?
                $this->columnNames[$fieldName] : $fieldName;
    }

    /**
     * Gets the mapping of a (regular) field that holds some data but not a
     * reference to another object.
     *
     * @param string $fieldName  The field name.
     * @return array  The field mapping.
     */
    public function getFieldMapping($fieldName)
    {
        if ( ! isset($this->fieldMappings[$fieldName])) {
            throw MappingException::mappingNotFound($fieldName);
        }
        return $this->fieldMappings[$fieldName];
    }
    
    /**
     * Gets the mapping of an association.
     *
     * @param string $fieldName  The field name that represents the association in
     *                           the object model.
     * @return Doctrine\ORM\Mapping\AssociationMapping  The mapping.
     */
    public function getAssociationMapping($fieldName)
    {
        if ( ! isset($this->associationMappings[$fieldName])) {
            throw MappingException::mappingNotFound($fieldName);
        }
        return $this->associationMappings[$fieldName];
    }
    
    /**
     * Gets the inverse association mapping for the given target class name and
     * owning fieldname.
     *
     * @param string $mappedByFieldName The field on the 
     * @return Doctrine\ORM\Mapping\AssociationMapping The mapping or NULL if there is no such
     *          inverse association mapping.
     */
    public function getInverseAssociationMapping($targetClassName, $mappedByFieldName)
    {
        return isset($this->inverseMappings[$targetClassName][$mappedByFieldName]) ?
                $this->inverseMappings[$targetClassName][$mappedByFieldName] : null;
    }
    
    /**
     * Checks whether the class has an inverse association mapping that points to the
     * specified class and ha the specified mappedBy field.
     *
     * @param string $targetClassName The name of the target class.
     * @param string $mappedByFieldName The name of the mappedBy field that points to the field on
     *          the target class that owns the association.
     * @return boolean
     */
    public function hasInverseAssociationMapping($targetClassName, $mappedByFieldName)
    {
        return isset($this->inverseMappings[$targetClassName][$mappedByFieldName]);
    }
    
    /**
     * Gets all association mappings of the class.
     *
     * @return array
     */
    public function getAssociationMappings()
    {
        return $this->associationMappings;
    }
    
    /**
     * Gets all association mappings of the class.
     * 
     * Alias for getAssociationMappings().
     *
     * @return array
     */
    public function getAssociations()
    {
        return $this->associationMappings;
    }

    /**
     * Gets the field name for a column name.
     * If no field name can be found the column name is returned.
     *
     * @param string $columnName    column name
     * @return string               column alias
     */
    public function getFieldName($columnName)
    {
        return isset($this->fieldNames[$columnName]) ?
                $this->fieldNames[$columnName] : $columnName;
    }
    
    /**
     * Validates & completes the given field mapping.
     *
     * @param array $mapping  The field mapping to validated & complete.
     * @return array  The validated and completed field mapping.
     */
    private function _validateAndCompleteFieldMapping(array &$mapping)
    {
        // Check mandatory fields
        if ( ! isset($mapping['fieldName'])) {
            throw MappingException::missingFieldName();
        }
        if ( ! isset($mapping['type'])) {
            throw MappingException::missingType();
        }

        // Complete fieldName and columnName mapping
        if ( ! isset($mapping['columnName'])) {
            $mapping['columnName'] = $mapping['fieldName'];
        } else {
            if ($mapping['columnName'][0] == '`') {
                $mapping['columnName'] = trim($mapping['columnName'], '`');
                $mapping['quoted'] = true;
            }
        }

        $this->columnNames[$mapping['fieldName']] = $mapping['columnName'];
        $this->fieldNames[$mapping['columnName']] = $mapping['fieldName'];
        
        // Complete id mapping
        if (isset($mapping['id']) && $mapping['id'] === true) {
            if ( ! in_array($mapping['fieldName'], $this->identifier)) {
                $this->identifier[] = $mapping['fieldName'];
            }
            // Check for composite key
            if ( ! $this->isIdentifierComposite && count($this->identifier) > 1) {
                $this->isIdentifierComposite = true;
            }
        }

        // Store ReflectionProperty of mapped field
        $refProp = $this->reflClass->getProperty($mapping['fieldName']);
        $refProp->setAccessible(true);
        $this->reflFields[$mapping['fieldName']] = $refProp;
    }
    
    /**
     * Maps an embedded value object.
     *
     * @todo Implementation.
     */
    /*public function mapEmbeddedValue()
    {
        //...
    }*/

    /**
     * Gets the identifier (primary key) field names of the class.
     *
     * @return mixed
     * @deprecated Use getIdentifierFieldNames()
     */
    public function getIdentifier()
    {
        return $this->identifier;
    }

    /**
     * Gets the identifier (primary key) field names of the class.
     *
     * @return mixed
     */
    public function getIdentifierFieldNames()
    {
        return $this->identifier;
    }
    
    /**
     * Gets the name of the single id field. Note that this only works on
     * entity classes that have a single-field pk.
     *
     * @return string
     */
    public function getSingleIdentifierFieldName()
    {
        if ($this->isIdentifierComposite) {
            throw DoctrineException::singleIdNotAllowedOnCompositePrimaryKey();
        }
        return $this->identifier[0];
    }

    /**
     * Gets the column name of the single id column. Note that this only works on
     * entity classes that have a single-field pk.
     *
     * @return string
     */
    public function getSingleIdentifierColumnName()
    {
        return $this->getColumnName($this->getSingleIdentifierFieldName());
    }

    /**
     * INTERNAL:
     * Sets the mapped identifier/primary key fields of this class.
     * Mainly used by the ClassMetadataFactory to assign inherited identifiers.
     *
     * @param array $identifier
     */
    public function setIdentifier(array $identifier)
    {
        $this->identifier = $identifier;
    }

    /**
     * Checks whether the class has a (mapped) field with a certain name.
     * 
     * @return boolean
     */
    public function hasField($fieldName)
    {
        return isset($this->reflFields[$fieldName]);
    }

    /**
     * Extracts the identifier values of an entity of this class.
     * 
     * For composite identifiers, the identifier values are returned as an array
     * with the same order as the field order in {@link identifier}.
     *
     * @param object $entity
     * @return mixed
     */
    public function getIdentifierValues($entity)
    {
        if ($this->isIdentifierComposite) {
            $id = array();
            foreach ($this->identifier as $idField) {
                $value = $this->reflFields[$idField]->getValue($entity);
                if ($value !== null) {
                    $id[] = $value;
                }
            }
            return $id;
        } else {
            return $this->reflFields[$this->identifier[0]]->getValue($entity);
        }
    }

    /**
     * Populates the entity identifier of an entity.
     *
     * @param object $entity
     * @param mixed $id
     * @todo Rename to assignIdentifier()
     */
    public function setIdentifierValues($entity, $id)
    {
        if ($this->isIdentifierComposite) {
            foreach ((array)$id as $idField => $idValue) {
                $this->reflFields[$idField]->setValue($entity, $idValue);
            }
        } else {
            $this->reflFields[$this->identifier[0]]->setValue($entity, $id);
        }
    }

    /**
     * Sets the specified field to the specified value on the given entity.
     *
     * @param object $entity
     * @param string $field
     * @param mixed $value
     */
    public function setFieldValue($entity, $field, $value)
    {
        $this->reflFields[$field]->setValue($entity, $value);
    }

    /**
     * Sets the field mapped to the specified column to the specified value on the given entity.
     *
     * @param object $entity
     * @param string $field
     * @param mixed $value
     */
    public function setColumnValue($entity, $column, $value)
    {
        $this->reflFields[$this->fieldNames[$column]]->setValue($entity, $value);
    }
    
    /**
     * Gets all field mappings.
     *
     * @return array
     */
    public function getFieldMappings()
    {
        return $this->fieldMappings;
    }

    /**
     * Gets an array containing all the column names.
     *
     * @return array
     */
    public function getColumnNames(array $fieldNames = null)
    {
        if ($fieldNames === null) {
            return array_keys($this->fieldNames);
        } else {
            $columnNames = array();
            foreach ($fieldNames as $fieldName) {
                $columnNames[] = $this->getColumnName($fieldName);
            } 
            return $columnNames;
        }
    }

    /**
     * Returns an array with all the identifier column names.
     *
     * @return array
     */
    public function getIdentifierColumnNames()
    {
        if ($this->isIdentifierComposite) {
            $columnNames = array();
            foreach ($this->identifier as $idField) {
                $columnNames[] = $this->fieldMappings[$idField]['columnName'];
            }
            return $columnNames;
        } else {
            return array($this->fieldMappings[$this->identifier[0]]['columnName']);
        }
    }

    /**
     * Returns an array containing all the field names.
     *
     * @return array
     */
    public function getFieldNames()
    {
        return array_values($this->fieldNames);
    }
    
    /**
     * Gets the Id generator type used by the class.
     *
     * @return string
     */
    public function getIdGeneratorType()
    {
        return $this->generatorType;
    }

    /**
     * Sets the type of Id generator to use for the mapped class.
     */
    public function setIdGeneratorType($generatorType)
    {
        $this->generatorType = $generatorType;
    }
    
    /**
     * Checks whether the mapped class uses an Id generator.
     *
     * @return boolean  TRUE if the mapped class uses an Id generator, FALSE otherwise.
     */
    public function usesIdGenerator()
    {
        return $this->generatorType != self::GENERATOR_TYPE_NONE;
    }

    /**
     *
     * @return boolean
     */
    public function isInheritanceTypeNone()
    {
        return $this->inheritanceType == self::INHERITANCE_TYPE_NONE;
    }
    
    /**
     * Checks whether the mapped class uses the JOINED inheritance mapping strategy.
     *
     * @return boolean TRUE if the class participates in a JOINED inheritance mapping,
     *                 FALSE otherwise.
     */
    public function isInheritanceTypeJoined()
    {
        return $this->inheritanceType == self::INHERITANCE_TYPE_JOINED;
    }
    
    /**
     * Checks whether the mapped class uses the SINGLE_TABLE inheritance mapping strategy.
     *
     * @return boolean TRUE if the class participates in a SINGLE_TABLE inheritance mapping,
     *                 FALSE otherwise.
     */
    public function isInheritanceTypeSingleTable()
    {
        return $this->inheritanceType == self::INHERITANCE_TYPE_SINGLE_TABLE;
    }
    
    /**
     * Checks whether the mapped class uses the TABLE_PER_CLASS inheritance mapping strategy.
     *
     * @return boolean TRUE if the class participates in a TABLE_PER_CLASS inheritance mapping,
     *                 FALSE otherwise.
     */
    public function isInheritanceTypeTablePerClass()
    {
        return $this->inheritanceType == self::INHERITANCE_TYPE_TABLE_PER_CLASS;
    }
    
    /**
     * Checks whether the class uses an identity column for the Id generation.
     *
     * @return boolean TRUE if the class uses the IDENTITY generator, FALSE otherwise.
     */
    public function isIdGeneratorIdentity()
    {
        return $this->generatorType == self::GENERATOR_TYPE_IDENTITY;
    }
    
    /**
     * Checks whether the class uses a sequence for id generation.
     *
     * @return boolean TRUE if the class uses the SEQUENCE generator, FALSE otherwise.
     */
    public function isIdGeneratorSequence()
    {
        return $this->generatorType == self::GENERATOR_TYPE_SEQUENCE;
    }
    
    /**
     * Checks whether the class uses a table for id generation.
     *
     * @return boolean  TRUE if the class uses the TABLE generator, FALSE otherwise.
     */
    public function isIdGeneratorTable()
    {
        $this->generatorType == self::GENERATOR_TYPE_TABLE;
    }
    
    /**
     * Checks whether the class has a natural identifier/pk (which means it does
     * not use any Id generator.
     *
     * @return boolean
     */
    public function isIdentifierNatural()
    {
        return $this->generatorType == self::GENERATOR_TYPE_NONE;
    }
    
    /**
     * Gets the type of a field.
     *
     * @param string $fieldName
     * @return Doctrine\DBAL\Types\Type
     */
    public function getTypeOfField($fieldName)
    {
        return isset($this->fieldMappings[$fieldName]) ?
                $this->fieldMappings[$fieldName]['type'] : null;
    }

    /**
     * Gets the type of a column.
     *
     * @return Doctrine\DBAL\Types\Type
     */
    public function getTypeOfColumn($columnName)
    {
        return $this->getTypeOfField($this->getFieldName($columnName));
    }

    /**
     * Gets the name of the primary table.
     *
     * @return string
     */
    public function getTableName()
    {
        return $this->primaryTable['name'];
    }
    
    /**
     * Gets the table name to use for temporary identifier tables of this class.
     * 
     * @return string
     */
    public function getTemporaryIdTableName()
    {
        return $this->primaryTable['name'] . '_id_tmp';
    }

    /**
     * Gets the inheritance mapping type used by the mapped class.
     *
     * @return string
     */
    public function getInheritanceType()
    {
        return $this->inheritanceType;
    }

    /**
     * Sets the mapped subclasses of this class.
     *
     * @param array $subclasses  The names of all mapped subclasses.
     */
    public function setSubclasses(array $subclasses)
    {
        foreach ($subclasses as $subclass) {
            if (strpos($subclass, '\\') === false) {
                $this->subClasses[] = $this->namespace . '\\' . $subclass;
            } else {
                $this->subClasses[] = $subclass;
            }
        }
    }

    /**
     * Gets the names of all subclasses.
     *
     * @return array  The names of all subclasses.
     */
    public function getSubclasses()
    {
        return $this->subClasses;
    }

    /**
     * Checks whether the class has any persistent subclasses.
     *
     * @return boolean TRUE if the class has one or more persistent subclasses, FALSE otherwise.
     */
    public function hasSubclasses()
    {
        return ! $this->subClasses;
    }

    /**
     * Gets the names of all parent classes.
     *
     * @return array  The names of all parent classes.
     */
    public function getParentClasses()
    {
        return $this->parentClasses;
    }

    /**
     * Sets the parent class names.
     * Assumes that the class names in the passed array are in the order:
     * directParent -> directParentParent -> directParentParentParent ... -> root.
     */
    public function setParentClasses(array $classNames)
    {
        $this->parentClasses = $classNames;
        if (count($classNames) > 0) {
            $this->rootEntityName = array_pop($classNames);
        }
    }

    /**
     * Checks whether the class has any persistent parent classes.
     *
     * @return boolean TRUE if the class has one or more persistent parent classes, FALSE otherwise.
     */
    public function hasParentClasses()
    {
        return ! $this->parentClasses;
    }

    /**
     * Sets the inheritance type used by the class and it's subclasses.
     *
     * @param integer $type
     */
    public function setInheritanceType($type)
    {
        if ( ! $this->_isInheritanceType($type)) {
            throw MappingException::invalidInheritanceType($type);
        }
        $this->inheritanceType = $type;
    }

    /**
     * Checks whether a mapped field is inherited from a superclass.
     *
     * @return boolean TRUE if the field is inherited, FALSE otherwise.
     */
    public function isInheritedField($fieldName)
    {
        return isset($this->fieldMappings[$fieldName]['inherited']);
    }

    /**
     * Sets the name of the primary table the class is mapped to.
     *
     * @param string $tableName  The table name.
     * @deprecated
     */
    public function setTableName($tableName)
    {
        $this->primaryTable['name'] = $tableName;
    }

    /**
     * Sets the primary table definition. The provided array must have the
     * following structure:
     *
     * name => <tableName>
     * schema => <schemaName>
     * catalog => <catalogName>
     *
     * @param array $primaryTableDefinition
     */
    public function setPrimaryTable(array $primaryTableDefinition)
    {
        $this->primaryTable = $primaryTableDefinition;
    }

    /**
     * Gets the primary table definition.
     *
     * @see setPrimaryTable()
     * @return array
     */
    public function getPrimaryTable()
    {
        return $this->primaryTable;
    }
    
    /**
     * Checks whether the given type identifies an inheritance type.
     *
     * @param string $type
     * @return boolean
     */
    private function _isInheritanceType($type)
    {
        return $type == self::INHERITANCE_TYPE_NONE ||
                $type == self::INHERITANCE_TYPE_SINGLE_TABLE ||
                $type == self::INHERITANCE_TYPE_JOINED ||
                $type == self::INHERITANCE_TYPE_TABLE_PER_CLASS;
    }
    
    /**
     * Checks whether the given type identifies an id generator type.
     *
     * @param string $type
     * @return boolean
     */
    private function _isIdGeneratorType($type)
    {
        return $type == self::GENERATOR_TYPE_AUTO ||
                $type == self::GENERATOR_TYPE_IDENTITY ||
                $type == self::GENERATOR_TYPE_SEQUENCE ||
                $type == self::GENERATOR_TYPE_TABLE ||
                $type == self::GENERATOR_TYPE_NONE;
    }
    
    /**
     * Makes some automatic additions to the association mapping to make the life
     * easier for the user, and store join columns in the metadata.
     *
     * @param array $mapping
     * @todo Pass param by ref?
     */
    private function _completeAssociationMapping(array $mapping)
    {
        $mapping['sourceEntity'] = $this->name;
        if (isset($mapping['targetEntity']) && strpos($mapping['targetEntity'], '\\') === false) {
            $mapping['targetEntity'] = $this->namespace . '\\' . $mapping['targetEntity'];
        }
        return $mapping;
    }

    /**
     * Adds a field mapping.
     *
     * @param array $mapping The field mapping.
     */
    public function mapField(array $mapping)
    {
        $this->_validateAndCompleteFieldMapping($mapping);
        if (isset($this->fieldMappings[$mapping['fieldName']])) {
            throw MappingException::duplicateFieldMapping($mapping['fieldName']);
        }
        $this->fieldMappings[$mapping['fieldName']] = $mapping;
    }

    /**
     * INTERNAL:
     * Adds an association mapping without completing/validating it.
     * This is mainly used to add inherited association mappings to derived classes.
     *
     * @param AssociationMapping $mapping
     * @param string $owningClassName The name of the class that defined this mapping.
     * @todo Rename: addInheritedAssociationMapping
     */
    public function addAssociationMapping(AssociationMapping $mapping, $owningClassName = null)
    {
        $sourceFieldName = $mapping->sourceFieldName;
        if (isset($this->associationMappings[$sourceFieldName])) {
            throw MappingException::duplicateFieldMapping();
        }
        $this->associationMappings[$sourceFieldName] = $mapping;
        if ($owningClassName !== null) {
            $this->inheritedAssociationFields[$sourceFieldName] = $owningClassName;
        }
        $this->_registerMappingIfInverse($mapping);
    }

    /**
     * INTERNAL:
     * Adds a field mapping without completing/validating it.
     * This is mainly used to add inherited field mappings to derived classes.
     *
     * @param array $mapping
     * @todo Rename: addInheritedFieldMapping
     */
    public function addFieldMapping(array $fieldMapping)
    {
        $this->fieldMappings[$fieldMapping['fieldName']] = $fieldMapping;
        $this->columnNames[$fieldMapping['fieldName']] = $fieldMapping['columnName'];
        $this->fieldNames[$fieldMapping['columnName']] = $fieldMapping['fieldName'];
    }

    /**
     * Adds a one-to-one mapping.
     * 
     * @param array $mapping The mapping.
     */
    public function mapOneToOne(array $mapping)
    {
        $mapping = $this->_completeAssociationMapping($mapping);
        $oneToOneMapping = new OneToOneMapping($mapping);
        $this->_storeAssociationMapping($oneToOneMapping);
    }

    /**
     * Registers the mapping as an inverse mapping, if it is a mapping on the
     * inverse side of an association mapping.
     *
     * @param AssociationMapping The mapping to register as inverse if it is a mapping
     *      for the inverse side of an association.
     */
    private function _registerMappingIfInverse(AssociationMapping $assoc)
    {
        if ($assoc->isInverseSide()) {
            $this->inverseMappings[$assoc->targetEntityName][$assoc->mappedByFieldName] = $assoc;
        }
    }

    /**
     * Adds a one-to-many mapping.
     * 
     * @param array $mapping The mapping.
     */
    public function mapOneToMany(array $mapping)
    {
        $mapping = $this->_completeAssociationMapping($mapping);
        $oneToManyMapping = new OneToManyMapping($mapping);
        $this->_storeAssociationMapping($oneToManyMapping);
    }

    /**
     * Adds a many-to-one mapping.
     * 
     * @param array $mapping The mapping.
     */
    public function mapManyToOne(array $mapping)
    {
        // A many-to-one mapping is simply a one-one backreference
        $this->mapOneToOne($mapping);
    }

    /**
     * Adds a many-to-many mapping.
     * 
     * @param array $mapping The mapping.
     */
    public function mapManyToMany(array $mapping)
    {
        $mapping = $this->_completeAssociationMapping($mapping);
        $manyToManyMapping = new ManyToManyMapping($mapping);
        $this->_storeAssociationMapping($manyToManyMapping);
    }
    
    /**
     * Stores the association mapping.
     *
     * @param AssociationMapping $assocMapping
     */
    private function _storeAssociationMapping(AssociationMapping $assocMapping)
    {
        $sourceFieldName = $assocMapping->sourceFieldName;
        if (isset($this->associationMappings[$sourceFieldName])) {
            throw MappingException::duplicateFieldMapping();
        }
        $this->associationMappings[$sourceFieldName] = $assocMapping;
        $this->_registerMappingIfInverse($assocMapping);

        // Store ReflectionProperty of mapped field
        $refProp = $this->reflClass->getProperty($sourceFieldName);
        $refProp->setAccessible(true);
        $this->reflFields[$sourceFieldName] = $refProp;
    }
    
    /**
     * Registers a custom repository class for the entity class.
     *
     * @param string $mapperClassName  The class name of the custom mapper.
     */
    public function setCustomRepositoryClass($repositoryClassName)
    {
        $this->customRepositoryClassName = $repositoryClassName;
    }
    
    /**
     * Gets the name of the custom repository class used for the entity class.
     *
     * @return string|null  The name of the custom repository class or NULL if the entity
     *                      class does not have a custom repository class.
     */
    public function getCustomRepositoryClass()
    {
         return $this->customRepositoryClassName;
    }

    /**
     * Sets whether sub classes should be automatically OUTER JOINed when a base
     * class is queried in a class hierarchy that uses the JOINED inheritance mapping
     * strategy.
     *
     * <b>This options does only apply to the JOINED inheritance mapping strategy.</b>
     *
     * @param boolean $bool
     * @see getJoinSubClasses()
     */
    /*public function setJoinSubClasses($bool)
    {
        $this->joinSubclasses = (bool)$bool;
    }*/

    /**
     * Gets whether the class mapped by this instance should OUTER JOIN sub classes
     * when a base class is queried.
     *
     * @return <type>
     * @see setJoinSubClasses()
     */
    /*public function getJoinSubClasses()
    {
        return $this->joinSubclasses;
    }*/
    
    /**
     * Dispatches the lifecycle event of the given entity to the registered
     * lifecycle callbacks and lifecycle listeners.
     *
     * @param string $event  The lifecycle event.
     * @param Entity $entity  The Entity on which the event occured.
     */
    public function invokeLifecycleCallbacks($lifecycleEvent, $entity)
    {
        foreach ($this->lifecycleCallbacks[$lifecycleEvent] as $callback) {
            $entity->$callback();
        }
    }
    
    /**
     * Whether the class has any attached lifecycle listeners or callbacks for a lifecycle event.
     * 
     * @param string $lifecycleEvent
     * @return boolean
     */
    public function hasLifecycleCallbacks($lifecycleEvent)
    {
        return isset($this->lifecycleCallbacks[$lifecycleEvent]);
    }
    
    /**
     * Gets the registered lifecycle callbacks for an event.
     *
     * @param string $event
     * @return array
     */
    public function getLifecycleCallbacks($event)
    {
        return isset($this->lifecycleCallbacks[$event]) ? $this->lifecycleCallbacks[$event] : array();
    }
    
    /**
     * Adds a lifecycle callback for entities of this class.
     *
     * Note: If the same callback is registered more than once, the old one
     * will be overridden.
     * 
     * @param string $callback
     * @param string $event
     */
    public function addLifecycleCallback($callback, $event)
    {
        $this->lifecycleCallbacks[$event][] = $callback;
    }

    /**
     * Sets the discriminator column definition.
     *
     * @param array $columnDef
     * @see getDiscriminatorColumn()
     */
    public function setDiscriminatorColumn($columnDef)
    {
        if ($columnDef !== null) {
            if ( ! isset($columnDef['name'])) {
                throw new MappingException("'name' attribute is mandatory for discriminator columns.");
            }
            if ( ! isset($columnDef['fieldName'])) {
                $columnDef['fieldName'] = $columnDef['name'];
            }
            $this->discriminatorColumn = $columnDef;
        }
    }

    /**
     * Gets the discriminator column definition.
     *
     * The discriminator column definition is an array with the following keys:
     * name: The name of the column
     * type: The type of the column (only integer and string supported)
     * length: The length of the column (applies only if type is string)
     *
     * A discriminator column is used for JOINED and SINGLE_TABLE inheritance mappings.
     *
     * @return array
     * @see setDiscriminatorColumn()
     */
    public function getDiscriminatorColumn()
    {
        return $this->discriminatorColumn;
    }

    /**
     * Sets the discriminator values used by this class.
     * Used for JOINED and SINGLE_TABLE inheritance mapping strategies.
     *
     * @param array $map
     */
    public function setDiscriminatorMap(array $map)
    {
        foreach ($map as $value => $className) {
            if (strpos($className, '\\') === false) {
                $className = $this->namespace . '\\' . $className;
            }
            $this->discriminatorMap[$value] = $className;
            if ($this->name == $className) {
                $this->discriminatorValue = $value;
            } else if (is_subclass_of($className, $this->name)) {
                $this->subClasses[] = $className;
            }
        }
    }

    /**
     * Gets the discriminator value of this class.
     * Used for JOINED and SINGLE_TABLE inheritance mapping strategies.
     *
     * @return array
     */
    public function getDiscriminatorValue()
    {
        return $this->discriminatorValue;
    }

    /**
     * Checks whether the given column name is the discriminator column.
     *
     * @param string $columnName
     * @return boolean
     */
    public function isDiscriminatorColumn($columnName)
    {
        return $columnName === $this->discriminatorColumn['name'];
    }

    /**
     * Checks whether the class has a mapped association with the given field name.
     *
     * @param string $fieldName
     * @return boolean
     */
    public function hasAssociation($fieldName)
    {
        return isset($this->associationMappings[$fieldName]);
    }

    /**
     * Checks whether the class has a mapped association for the specified field
     * and if yes, checks whether it is a single-valued association (to-one).
     *
     * @param string $fieldName
     * @return boolean TRUE if the association exists and is single-valued, FALSE otherwise.
     */
    public function isSingleValuedAssociation($fieldName)
    {
        return isset($this->associationMappings[$fieldName]) &&
                $this->associationMappings[$fieldName]->isOneToOne();
    }

    /**
     * Checks whether the class has a mapped association for the specified field
     * and if yes, checks whether it is a collection-valued association (to-many).
     *
     * @param string $fieldName
     * @return boolean TRUE if the association exists and is collection-valued, FALSE otherwise.
     */
    public function isCollectionValuedAssociation($fieldName)
    {
        return isset($this->associationMappings[$fieldName]) &&
                ! $this->associationMappings[$fieldName]->isOneToOne();
    }

    /**
     * Gets the name of the ID generator used for this class.
     * Only classes that use a SEQUENCE or TABLE ID generation strategy have a generator name.
     *
     * @return string|null The name of the ID generator or NULL if this class does not
     *                     use a named ID generator.
     */
    /*public function getIdGeneratorName()
    {
        return $this->idGeneratorName;
    }*/

    /**
     * Sets the ID generator used to generate IDs for instances of this class.
     *
     * @param AbstractIdGenerator $generator
     */
    public function setIdGenerator($generator)
    {
        $this->idGenerator = $generator;
    }

    /**
     * Gets the ID generator used to generate IDs for instances of this class.
     *
     * @return AbstractIdGenerator
     */
    public function getIdGenerator()
    {
        return $this->idGenerator;
    }

    /**
     * Gets the definition of the sequence ID generator for this class.
     *
     * The definition has the following structure:
     * <code>
     * array(
     *     'sequenceName' => 'name',
     *     'allocationSize' => 20,
     *     'initialValue' => 1
     * )
     * </code>
     * 
     * @return array|null An array with the generator definition or NULL if this class
     *                    has no sequence generator definition.
     */
    public function getSequenceGeneratorDefinition()
    {
        return $this->sequenceGeneratorDefinition;
    }

    /**
     * Sets the definition of the sequence ID generator for this class.
     *
     * The definition must have the following structure:
     * <code>
     * array(
     *     'sequenceName' => 'name',
     *     'allocationSize' => 20,
     *     'initialValue' => 1
     * )
     * </code>
     *
     * @param array $definition
     */
    public function setSequenceGeneratorDefinition(array $definition)
    {
        $this->sequenceGeneratorDefinition = $definition;
    }
    
    /**
     * Sets the version field mapping used for versioning. Sets the default
     * value to use depending on the column type
     *
     * @param array $mapping   The version field mapping array
     * @return void
     */
    public function setVersionMapping(array &$mapping)
    {
        $this->isVersioned = true;
        $this->versionField = $mapping['fieldName'];

        if ( ! isset($mapping['default'])) {
            if ($mapping['type'] == 'integer') {
                $mapping['default'] = 1;
            } else if ($mapping['type'] == 'datetime') {
                $mapping['default'] = 'CURRENT_TIMESTAMP';
            } else {
                throw DoctrineException::unsupportedOptimisticLockingType($mapping['type']);
            }
        }
    }
    
    /**
     * Checks whether this class is versioned for optimistic locking.
     * 
     * @return boolean TRUE if this class is versioned for optimistic locking, FALSE otherwise.
     */
    public function isVersioned()
    {
        return $this->isVersioned;
    }
    
    /**
     * Sets whether this class is to be versioned for optimistic locking.
     * 
     * @param boolean $bool
     */
    public function setVersioned($bool)
    {
        $this->isVersioned = $bool;
    }
    
    /**
     * Gets the name of the field that is used for versioning if this class is versioned
     * for optimistic locking.
     * 
     * @return string
     */
    public function getVersionField()
    {
        return $this->versionField;
    }
    
    /**
     * Sets the name of the field that is to be used for versioning if this class is
     * versioned for optimistic locking.
     * 
     * @param string $versionField
     */
    public function setVersionField($versionField)
    {
        $this->versionField = $versionField;
    }
    
    /**
     * Gets the (possibly quoted) column name of a mapped field for safe use
     * in an SQL statement.
     * 
     * @param string $field
     * @param AbstractPlatform $platform
     * @return string
     */
    public function getQuotedColumnName($field, $platform)
    {
        return isset($this->fieldMappings[$field]['quoted']) ?
                $platform->quoteIdentifier($this->fieldMappings[$field]['columnName']) :
                $this->fieldMappings[$field]['columnName'];
    }
    
    /**
     * Gets the (possibly quoted) primary table name of this class for safe use
     * in an SQL statement.
     * 
     * @param AbstractPlatform $platform
     * @return string
     */
    public function getQuotedTableName($platform)
    {
        return isset($this->primaryTable['quoted']) ?
                $platform->quoteIdentifier($this->primaryTable['name']) :
                $this->primaryTable['name'];
    }
    
    /**
     * Gets the (possibly quoted) name of the discriminator column for safe use
     * in an SQL statement.
     * 
     * @param AbstractPlatform $platform
     * @return string
     */
    public function getQuotedDiscriminatorColumnName($platform)
    {
        return isset($this->discriminatorColumn['quoted']) ?
                $platform->quoteIdentifier($this->discriminatorColumn['name']) :
                $this->discriminatorColumn['name'];
    }
    
    /**
     * Creates a string representation of this instance.
     *
     * @return string The string representation of this instance.
     * @todo Construct meaningful string representation.
     */
    public function __toString()
    {
        return __CLASS__ . '@' . spl_object_hash($this);
    }
    
    /**
     * Determines which fields get serialized.
     * 
     * Parts that are NOT serialized because they can not be properly unserialized:
     *      - reflClass (ReflectionClass)
     *      - reflFields (ReflectionProperty array)
     * 
     * @return array The names of all the fields that should be serialized.
     */
    public function __sleep()
    {
        return array(
            'associationMappings',
            'changeTrackingPolicy',
            'columnNames',
            'customRepositoryClassName',
            'discriminatorColumn',
            'discriminatorValue',
            'discriminatorMap',
            'fieldMappings',
            'fieldNames',
            'generatorType',
            'identifier',
            'idGenerator',
            'inheritanceType',
            'inheritedAssociationFields',
            'insertSql',
            'inverseMappings',
            'isIdentifierComposite',
            'isMappedSuperclass',
            'isVersioned',
            'lifecycleCallbacks',
            'name',
            'namespace',
            'parentClasses',
            'primaryTable',
            'resultColumnNames',
            'rootEntityName',
            'sequenceGeneratorDefinition',
            'subClasses',
            'versionField'
        );
    }
    
    /**
     * Restores some state that could not be serialized/unserialized.
     * 
     * @return void
     */
    public function __wakeup()
    {
        // Restore ReflectionClass and properties
        $this->reflClass = new \ReflectionClass($this->name);
        foreach ($this->fieldNames as $field) {
            $this->reflFields[$field] = $this->reflClass->getProperty($field);
            $this->reflFields[$field]->setAccessible(true);
        }
        foreach ($this->associationMappings as $field => $mapping) {
            $this->reflFields[$field] = $this->reflClass->getProperty($field);
            $this->reflFields[$field]->setAccessible(true);
        }
    }
}