<?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 ORM metadata of an entity and
 * it's associations. It is the backbone of Doctrine's metadata mapping.
 *
 * <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;

    /**
     * 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>unique (string, optional, schema-only)</b>
     * Whether a unique constraint should be generated for the column.
     * The value specifies the name of the unique constraint. To create a multi-column 
     * unique constraint, 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();

    /**
     * An array of 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();

    /**
     * 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 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>
     *
     * @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;

    /**
     * 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
     */
    //private $_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;
        $this->namespace = substr($entityName, 0, strrpos($entityName, '\\'));
        $this->primaryTable['name'] = str_replace($this->namespace . '\\', '', $this->name);
        $this->rootEntityName = $entityName;
        $this->reflClass = new \ReflectionClass($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::updateMe("getSingleIdReflectionProperty called on entity with composite key.");
        }
        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 $fieldName  The field name
     * @return boolean  TRUE if the field is not null, FALSE otherwise.
     */
    public function isNotNull($fieldName)
    {
        $mapping = $this->getFieldMapping($fieldName);
        if ($mapping !== false) {
            return isset($mapping['nullable']) && $mapping['nullable'] == false;
        }
        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 fieldname.
     *
     * @param string $mappedByFieldName
     * @return Doctrine\ORM\Mapping\AssociationMapping The mapping.
     */
    public function getInverseAssociationMapping($mappedByFieldName)
    {
        return $this->inverseMappings[$mappedByFieldName];
    }
    
    /**
     * Whether the class has an inverse association mapping on the given fieldname.
     *
     * @param string $mappedByFieldName
     * @return boolean
     */
    public function hasInverseAssociationMapping($mappedByFieldName)
    {
        return isset($this->inverseMappings[$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'];
        }

        $this->columnNames[$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;
    }
    
    /**
     * @todo Implementation of Optimistic Locking.
     */
    public function mapVersionField(array $mapping)
    {
        //...
    }
    
    /**
     * Overrides an existant field mapping.
     * Used i.e. by Entity classes deriving from another Entity class that acts
     * as a mapped superclass to refine the basic mapping.
     *
     * @param array $newMapping
     * @todo Implementation.
     */
    public function overrideFieldMapping(array $newMapping)
    {
        //...
    }
    
    /**
     * 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::updateMe("Calling getSingleIdentifierFieldName "
                    . "on a class that uses a composite identifier is not allowed.");
        }
        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()
    {
        return $this->getColumnNames((array)$this->getIdentifierFieldNames());
    }

    /**
     * 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 <type> 
     */
    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 (maximum) length of a field.
     */
    public function getFieldLength($fieldName)
    {
        return $this->fieldMappings[$fieldName]['length'];
    }

    /**
     * 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';
    }

    public function getInheritedFields()
    {

    }

    /**
     * Adds a named query.
     *
     * @param string $name  The name under which the query gets registered.
     * @param string $query The DQL query.
     * @todo Implementation.
     */
    public function addNamedQuery($name, $query)
    {
        //...
    }

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

    /**
     * Sets the subclasses of the mapped class.
     * 
     * <b>All entity classes that participate in a hierarchy and have subclasses
     * need to declare them this way.</b>
     *
     * @param array $subclasses  The names of all subclasses.
     */
    public function setSubclasses(array $subclasses)
    {
        $this->subClasses = $subclasses;
    }

    /**
     * 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
     */
    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)
    {
        $sourceFieldName = $mapping->sourceFieldName;
        if (isset($this->associationMappings[$sourceFieldName])) {
            throw MappingException::duplicateFieldMapping();
        }
        $this->associationMappings[$sourceFieldName] = $mapping;
        $this->inheritedAssociationFields[$sourceFieldName] = $owningClassName;
        $this->_registerMappingIfInverse($mapping);
    }

    /**
     * INTERNAL:
     * Adds an association 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->getMappedByFieldName()] = $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 = $assocMapping->getSourceFieldName();
        if (isset($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)
    {
        $this->discriminatorColumn = $columnDef;
        if ( ! isset($columnDef['fieldName'])) {
            $this->discriminatorColumn['fieldName'] = $columnDef['name'];
        }
    }

    /**
     * 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 dsicriminator value used by this class.
     * Used for JOINED and SINGLE_TABLE inheritance mapping strategies.
     *
     * @param array $map
     */
    public function setDiscriminatorValue($value)
    {
        $this->discriminatorValue = $value;
    }

    /**
     * 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;
    }
    
    /**
     * 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;
    }

    /**
     * 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);
    }
}