<?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\Query;

/**
 * An adapter implementation of the TreeWalker interface. The methods in this class
 * are empty. ﻿This class exists as convenience for creating tree walkers.
 * 
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
abstract class TreeWalkerAdapter implements TreeWalker
{
    private $_query;
    private $_parserResult;
    private $_queryComponents;
    
    /**
     * {@inheritdoc}
     */
    public function __construct($query, $parserResult, array $queryComponents)
    {
        $this->_query = $query;
        $this->_parserResult = $parserResult;
        $this->_queryComponents = $queryComponents;
    }

    /**
     * @return array
     */
    protected function _getQueryComponents()
    {
        return $this->_queryComponents;
    }

    /**
     * Retrieve Query Instance reponsible for the current walkers execution.
     *
     * @return Doctrine\ORM\Query
     */
    protected function _getQuery()
    {
        return $this->_query;
    }

    /**
     * Retrieve ParserResult
     *
     * @return Doctrine\ORM\Query\ParserResult
     */
    protected function _getParserResult()
    {
        return $this->_parserResult;
    }
    
    /**
     * Walks down a SelectStatement AST node, thereby generating the appropriate SQL.
     *
     * @return string The SQL.
     */
    public function walkSelectStatement(AST\SelectStatement $AST) {}

    /**
     * Walks down a SelectClause AST node, thereby generating the appropriate SQL.
     *
     * @return string The SQL.
     */
    public function walkSelectClause($selectClause) {}

    /**
     * Walks down a FromClause AST node, thereby generating the appropriate SQL.
     *
     * @return string The SQL.
     */
    public function walkFromClause($fromClause) {}

    /**
     * Walks down a FunctionNode AST node, thereby generating the appropriate SQL.
     *
     * @return string The SQL.
     */
    public function walkFunction($function) {}

    /**
     * Walks down an OrderByClause AST node, thereby generating the appropriate SQL.
     *
     * @param OrderByClause
     * @return string The SQL.
     */
    public function walkOrderByClause($orderByClause) {}

    /**
     * Walks down an OrderByItem AST node, thereby generating the appropriate SQL.
     *
     * @param OrderByItem
     * @return string The SQL.
     */
    public function walkOrderByItem($orderByItem) {}

    /**
     * Walks down a HavingClause AST node, thereby generating the appropriate SQL.
     *
     * @param HavingClause
     * @return string The SQL.
     */
    public function walkHavingClause($havingClause) {}

    /**
     * Walks down a JoinVariableDeclaration AST node and creates the corresponding SQL.
     *
     * @param JoinVariableDeclaration $joinVarDecl
     * @return string The SQL.
     */
    public function walkJoinVariableDeclaration($joinVarDecl) {}

    /**
     * Walks down a SelectExpression AST node and generates the corresponding SQL.
     *
     * @param SelectExpression $selectExpression
     * @return string The SQL.
     */
    public function walkSelectExpression($selectExpression) {}

    /**
     * Walks down a QuantifiedExpression AST node, thereby generating the appropriate SQL.
     *
     * @param QuantifiedExpression
     * @return string The SQL.
     */
    public function walkQuantifiedExpression($qExpr) {}

    /**
     * Walks down a Subselect AST node, thereby generating the appropriate SQL.
     *
     * @param Subselect
     * @return string The SQL.
     */
    public function walkSubselect($subselect) {}

    /**
     * Walks down a SubselectFromClause AST node, thereby generating the appropriate SQL.
     *
     * @param SubselectFromClause
     * @return string The SQL.
     */
    public function walkSubselectFromClause($subselectFromClause) {}

    /**
     * Walks down a SimpleSelectClause AST node, thereby generating the appropriate SQL.
     *
     * @param SimpleSelectClause
     * @return string The SQL.
     */
    public function walkSimpleSelectClause($simpleSelectClause) {}

    /**
     * Walks down a SimpleSelectExpression AST node, thereby generating the appropriate SQL.
     *
     * @param SimpleSelectExpression
     * @return string The SQL.
     */
    public function walkSimpleSelectExpression($simpleSelectExpression) {}

    /**
     * Walks down an AggregateExpression AST node, thereby generating the appropriate SQL.
     *
     * @param AggregateExpression
     * @return string The SQL.
     */
    public function walkAggregateExpression($aggExpression) {}

    /**
     * Walks down a GroupByClause AST node, thereby generating the appropriate SQL.
     *
     * @param GroupByClause
     * @return string The SQL.
     */
    public function walkGroupByClause($groupByClause) {}

    /**
     * Walks down a GroupByItem AST node, thereby generating the appropriate SQL.
     *
     * @param GroupByItem
     * @return string The SQL.
     */
    public function walkGroupByItem(AST\PathExpression $pathExpr) {}

    /**
     * Walks down an UpdateStatement AST node, thereby generating the appropriate SQL.
     *
     * @param UpdateStatement
     * @return string The SQL.
     */
    public function walkUpdateStatement(AST\UpdateStatement $AST) {}

    /**
     * Walks down a DeleteStatement AST node, thereby generating the appropriate SQL.
     *
     * @param DeleteStatement
     * @return string The SQL.
     */
    public function walkDeleteStatement(AST\DeleteStatement $AST) {}

    /**
     * Walks down a DeleteClause AST node, thereby generating the appropriate SQL.
     *
     * @param DeleteClause
     * @return string The SQL.
     */
    public function walkDeleteClause(AST\DeleteClause $deleteClause) {}

    /**
     * Walks down an UpdateClause AST node, thereby generating the appropriate SQL.
     *
     * @param UpdateClause
     * @return string The SQL.
     */
    public function walkUpdateClause($updateClause) {}

    /**
     * Walks down an UpdateItem AST node, thereby generating the appropriate SQL.
     *
     * @param UpdateItem
     * @return string The SQL.
     */
    public function walkUpdateItem($updateItem) {}

    /**
     * Walks down a WhereClause AST node, thereby generating the appropriate SQL.
     *
     * @param WhereClause
     * @return string The SQL.
     */
    public function walkWhereClause($whereClause) {}

    /**
     * Walks down a ConditionalTerm AST node, thereby generating the appropriate SQL.
     *
     * @param ConditionalTerm
     * @return string The SQL.
     */
    public function walkConditionalTerm($condTerm) {}

    /**
     * Walks down a ConditionalFactor AST node, thereby generating the appropriate SQL.
     *
     * @param ConditionalFactor
     * @return string The SQL.
     */
    public function walkConditionalFactor($factor) {}

    /**
     * Walks down an ExistsExpression AST node, thereby generating the appropriate SQL.
     *
     * @param ExistsExpression
     * @return string The SQL.
     */
    public function walkExistsExpression($existsExpr) {}
    
    /**
     * Walks down a CollectionMemberExpression AST node, thereby generating the appropriate SQL.
     *
     * @param CollectionMemberExpression
     * @return string The SQL.
     */
    public function walkCollectionMemberExpression($collMemberExpr) {}

    /**
     * Walks down an EmptyCollectionComparisonExpression AST node, thereby generating the appropriate SQL.
     *
     * @param EmptyCollectionComparisonExpression
     * @return string The SQL.
     */
    public function walkEmptyCollectionComparisonExpression($emptyCollCompExpr) {}

    /**
     * Walks down a NullComparisonExpression AST node, thereby generating the appropriate SQL.
     *
     * @param NullComparisonExpression
     * @return string The SQL.
     */
    public function walkNullComparisonExpression($nullCompExpr) {}

    /**
     * Walks down an InExpression AST node, thereby generating the appropriate SQL.
     *
     * @param InExpression
     * @return string The SQL.
     */
    public function walkInExpression($inExpr) {}

    /**
     * Walks down a literal that represents an AST node, thereby generating the appropriate SQL.
     *
     * @param mixed
     * @return string The SQL.
     */
    public function walkLiteral($literal) {}

    /**
     * Walks down a BetweenExpression AST node, thereby generating the appropriate SQL.
     *
     * @param BetweenExpression
     * @return string The SQL.
     */
    public function walkBetweenExpression($betweenExpr) {}

    /**
     * Walks down a LikeExpression AST node, thereby generating the appropriate SQL.
     *
     * @param LikeExpression
     * @return string The SQL.
     */
    public function walkLikeExpression($likeExpr) {}

    /**
     * Walks down a StateFieldPathExpression AST node, thereby generating the appropriate SQL.
     *
     * @param StateFieldPathExpression
     * @return string The SQL.
     */
    public function walkStateFieldPathExpression($stateFieldPathExpression) {}

    /**
     * Walks down a ComparisonExpression AST node, thereby generating the appropriate SQL.
     *
     * @param ComparisonExpression
     * @return string The SQL.
     */
    public function walkComparisonExpression($compExpr) {}

    /**
     * Walks down an InputParameter AST node, thereby generating the appropriate SQL.
     *
     * @param InputParameter
     * @return string The SQL.
     */
    public function walkInputParameter($inputParam) {}

    /**
     * Walks down an ArithmeticExpression AST node, thereby generating the appropriate SQL.
     *
     * @param ArithmeticExpression
     * @return string The SQL.
     */
    public function walkArithmeticExpression($arithmeticExpr) {}

    /**
     * Walks down an ArithmeticTerm AST node, thereby generating the appropriate SQL.
     *
     * @param mixed
     * @return string The SQL.
     */
    public function walkArithmeticTerm($term) {}

    /**
     * Walks down a StringPrimary that represents an AST node, thereby generating the appropriate SQL.
     *
     * @param mixed
     * @return string The SQL.
     */
    public function walkStringPrimary($stringPrimary) {}

    /**
     * Walks down an ArithmeticFactor that represents an AST node, thereby generating the appropriate SQL.
     *
     * @param mixed
     * @return string The SQL.
     */
    public function walkArithmeticFactor($factor) {}

    /**
     * Walks down an SimpleArithmeticExpression AST node, thereby generating the appropriate SQL.
     *
     * @param SimpleArithmeticExpression
     * @return string The SQL.
     */
    public function walkSimpleArithmeticExpression($simpleArithmeticExpr) {}

    /**
     * Walks down an PathExpression AST node, thereby generating the appropriate SQL.
     *
     * @param mixed
     * @return string The SQL.
     */
    public function walkPathExpression($pathExpr) {}
    
    /**
     * Gets an executor that can be used to execute the result of this walker.
     * 
     * @return AbstractExecutor
     */
    public function getExecutor($AST) {}
}