--- /dev/null
+<?php
+/*
+ * 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 MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Query;
+
+/**
+ * Represents a chain of tree walkers that modify an AST and finally emit output.
+ * Only the last walker in the chain can emit output. Any previous walkers can modify
+ * the AST to influence the final output produced by the last walker.
+ *
+ * @author Roman Borschel <roman@code-factory.org>
+ * @since 2.0
+ */
+class TreeWalkerChain implements TreeWalker
+{
+ /** The tree walkers. */
+ private $_walkers = array();
+ /** The original Query. */
+ private $_query;
+ /** The ParserResult of the original query that was produced by the Parser. */
+ private $_parserResult;
+ /** The query components of the original query (the "symbol table") that was produced by the Parser. */
+ private $_queryComponents;
+
+ /**
+ * @inheritdoc
+ */
+ public function __construct($query, $parserResult, array $queryComponents)
+ {
+ $this->_query = $query;
+ $this->_parserResult = $parserResult;
+ $this->_queryComponents = $queryComponents;
+ }
+
+ /**
+ * Adds a tree walker to the chain.
+ *
+ * @param string $walkerClass The class of the walker to instantiate.
+ */
+ public function addTreeWalker($walkerClass)
+ {
+ $this->_walkers[] = new $walkerClass($this->_query, $this->_parserResult, $this->_queryComponents);
+ }
+
+ /**
+ * Walks down a SelectStatement AST node, thereby generating the appropriate SQL.
+ *
+ * @return string The SQL.
+ */
+ public function walkSelectStatement(AST\SelectStatement $AST)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSelectStatement($AST);
+ }
+ }
+
+ /**
+ * Walks down a SelectClause AST node, thereby generating the appropriate SQL.
+ *
+ * @return string The SQL.
+ */
+ public function walkSelectClause($selectClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSelectClause($selectClause);
+ }
+ }
+
+ /**
+ * Walks down a FromClause AST node, thereby generating the appropriate SQL.
+ *
+ * @return string The SQL.
+ */
+ public function walkFromClause($fromClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkFromClause($fromClause);
+ }
+ }
+
+ /**
+ * Walks down a FunctionNode AST node, thereby generating the appropriate SQL.
+ *
+ * @return string The SQL.
+ */
+ public function walkFunction($function)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkFunction($function);
+ }
+ }
+
+ /**
+ * Walks down an OrderByClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param OrderByClause
+ * @return string The SQL.
+ */
+ public function walkOrderByClause($orderByClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkOrderByClause($orderByClause);
+ }
+ }
+
+ /**
+ * Walks down an OrderByItem AST node, thereby generating the appropriate SQL.
+ *
+ * @param OrderByItem
+ * @return string The SQL.
+ */
+ public function walkOrderByItem($orderByItem)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkOrderByItem($orderByItem);
+ }
+ }
+
+ /**
+ * Walks down a HavingClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param HavingClause
+ * @return string The SQL.
+ */
+ public function walkHavingClause($havingClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkHavingClause($havingClause);
+ }
+ }
+
+ /**
+ * Walks down a Join AST node and creates the corresponding SQL.
+ *
+ * @param Join $join
+ * @return string The SQL.
+ */
+ public function walkJoin($join)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkJoin($join);
+ }
+ }
+
+ /**
+ * Walks down a SelectExpression AST node and generates the corresponding SQL.
+ *
+ * @param SelectExpression $selectExpression
+ * @return string The SQL.
+ */
+ public function walkSelectExpression($selectExpression)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSelectExpression($selectExpression);
+ }
+ }
+
+ /**
+ * Walks down a QuantifiedExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param QuantifiedExpression
+ * @return string The SQL.
+ */
+ public function walkQuantifiedExpression($qExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkQuantifiedExpression($qExpr);
+ }
+ }
+
+ /**
+ * Walks down a Subselect AST node, thereby generating the appropriate SQL.
+ *
+ * @param Subselect
+ * @return string The SQL.
+ */
+ public function walkSubselect($subselect)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSubselect($subselect);
+ }
+ }
+
+ /**
+ * Walks down a SubselectFromClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param SubselectFromClause
+ * @return string The SQL.
+ */
+ public function walkSubselectFromClause($subselectFromClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSubselectFromClause($subselectFromClause);
+ }
+ }
+
+ /**
+ * Walks down a SimpleSelectClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param SimpleSelectClause
+ * @return string The SQL.
+ */
+ public function walkSimpleSelectClause($simpleSelectClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSimpleSelectClause($simpleSelectClause);
+ }
+ }
+
+ /**
+ * Walks down a SimpleSelectExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param SimpleSelectExpression
+ * @return string The SQL.
+ */
+ public function walkSimpleSelectExpression($simpleSelectExpression)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSimpleSelectExpression($simpleSelectExpression);
+ }
+ }
+
+ /**
+ * Walks down an AggregateExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param AggregateExpression
+ * @return string The SQL.
+ */
+ public function walkAggregateExpression($aggExpression)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkAggregateExpression($aggExpression);
+ }
+ }
+
+ /**
+ * Walks down a GroupByClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param GroupByClause
+ * @return string The SQL.
+ */
+ public function walkGroupByClause($groupByClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkGroupByClause($groupByClause);
+ }
+ }
+
+ /**
+ * Walks down a GroupByItem AST node, thereby generating the appropriate SQL.
+ *
+ * @param GroupByItem
+ * @return string The SQL.
+ */
+ public function walkGroupByItem($groupByItem)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkGroupByItem($groupByItem);
+ }
+ }
+
+ /**
+ * Walks down an UpdateStatement AST node, thereby generating the appropriate SQL.
+ *
+ * @param UpdateStatement
+ * @return string The SQL.
+ */
+ public function walkUpdateStatement(AST\UpdateStatement $AST)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkUpdateStatement($AST);
+ }
+ }
+
+ /**
+ * Walks down a DeleteStatement AST node, thereby generating the appropriate SQL.
+ *
+ * @param DeleteStatement
+ * @return string The SQL.
+ */
+ public function walkDeleteStatement(AST\DeleteStatement $AST)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkDeleteStatement($AST);
+ }
+ }
+
+ /**
+ * Walks down a DeleteClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param DeleteClause
+ * @return string The SQL.
+ */
+ public function walkDeleteClause(AST\DeleteClause $deleteClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkDeleteClause($deleteClause);
+ }
+ }
+
+ /**
+ * Walks down an UpdateClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param UpdateClause
+ * @return string The SQL.
+ */
+ public function walkUpdateClause($updateClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkUpdateClause($updateClause);
+ }
+ }
+
+ /**
+ * Walks down an UpdateItem AST node, thereby generating the appropriate SQL.
+ *
+ * @param UpdateItem
+ * @return string The SQL.
+ */
+ public function walkUpdateItem($updateItem)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkUpdateItem($updateItem);
+ }
+ }
+
+ /**
+ * Walks down a WhereClause AST node, thereby generating the appropriate SQL.
+ *
+ * @param WhereClause
+ * @return string The SQL.
+ */
+ public function walkWhereClause($whereClause)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkWhereClause($whereClause);
+ }
+ }
+
+ /**
+ * Walks down a ConditionalExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param ConditionalExpression
+ * @return string The SQL.
+ */
+ public function walkConditionalExpression($condExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkConditionalExpression($condExpr);
+ }
+ }
+
+ /**
+ * Walks down a ConditionalTerm AST node, thereby generating the appropriate SQL.
+ *
+ * @param ConditionalTerm
+ * @return string The SQL.
+ */
+ public function walkConditionalTerm($condTerm)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkConditionalTerm($condTerm);
+ }
+ }
+
+ /**
+ * Walks down a ConditionalFactor AST node, thereby generating the appropriate SQL.
+ *
+ * @param ConditionalFactor
+ * @return string The SQL.
+ */
+ public function walkConditionalFactor($factor)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkConditionalFactor($factor);
+ }
+ }
+
+ /**
+ * Walks down a ConditionalPrimary AST node, thereby generating the appropriate SQL.
+ *
+ * @param ConditionalPrimary
+ * @return string The SQL.
+ */
+ public function walkConditionalPrimary($condPrimary)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkConditionalPrimary($condPrimary);
+ }
+ }
+
+ /**
+ * Walks down an ExistsExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param ExistsExpression
+ * @return string The SQL.
+ */
+ public function walkExistsExpression($existsExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkExistsExpression($existsExpr);
+ }
+ }
+
+ /**
+ * Walks down a CollectionMemberExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param CollectionMemberExpression
+ * @return string The SQL.
+ */
+ public function walkCollectionMemberExpression($collMemberExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkCollectionMemberExpression($collMemberExpr);
+ }
+ }
+
+ /**
+ * Walks down an EmptyCollectionComparisonExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param EmptyCollectionComparisonExpression
+ * @return string The SQL.
+ */
+ public function walkEmptyCollectionComparisonExpression($emptyCollCompExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkEmptyCollectionComparisonExpression($emptyCollCompExpr);
+ }
+ }
+
+ /**
+ * Walks down a NullComparisonExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param NullComparisonExpression
+ * @return string The SQL.
+ */
+ public function walkNullComparisonExpression($nullCompExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkNullComparisonExpression($nullCompExpr);
+ }
+ }
+
+ /**
+ * Walks down an InExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param InExpression
+ * @return string The SQL.
+ */
+ public function walkInExpression($inExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkInExpression($inExpr);
+ }
+ }
+
+ /**
+ * Walks down an InstanceOfExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param InstanceOfExpression
+ * @return string The SQL.
+ */
+ function walkInstanceOfExpression($instanceOfExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkInstanceOfExpression($instanceOfExpr);
+ }
+ }
+
+ /**
+ * Walks down a literal that represents an AST node, thereby generating the appropriate SQL.
+ *
+ * @param mixed
+ * @return string The SQL.
+ */
+ public function walkLiteral($literal)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkLiteral($literal);
+ }
+ }
+
+ /**
+ * Walks down a BetweenExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param BetweenExpression
+ * @return string The SQL.
+ */
+ public function walkBetweenExpression($betweenExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkBetweenExpression($betweenExpr);
+ }
+ }
+
+ /**
+ * Walks down a LikeExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param LikeExpression
+ * @return string The SQL.
+ */
+ public function walkLikeExpression($likeExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkLikeExpression($likeExpr);
+ }
+ }
+
+ /**
+ * Walks down a StateFieldPathExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param StateFieldPathExpression
+ * @return string The SQL.
+ */
+ public function walkStateFieldPathExpression($stateFieldPathExpression)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkStateFieldPathExpression($stateFieldPathExpression);
+ }
+ }
+
+ /**
+ * Walks down a ComparisonExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param ComparisonExpression
+ * @return string The SQL.
+ */
+ public function walkComparisonExpression($compExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkComparisonExpression($compExpr);
+ }
+ }
+
+ /**
+ * Walks down an InputParameter AST node, thereby generating the appropriate SQL.
+ *
+ * @param InputParameter
+ * @return string The SQL.
+ */
+ public function walkInputParameter($inputParam)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkInputParameter($inputParam);
+ }
+ }
+
+ /**
+ * Walks down an ArithmeticExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param ArithmeticExpression
+ * @return string The SQL.
+ */
+ public function walkArithmeticExpression($arithmeticExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkArithmeticExpression($arithmeticExpr);
+ }
+ }
+
+ /**
+ * Walks down an ArithmeticTerm AST node, thereby generating the appropriate SQL.
+ *
+ * @param mixed
+ * @return string The SQL.
+ */
+ public function walkArithmeticTerm($term)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkArithmeticTerm($term);
+ }
+ }
+
+ /**
+ * Walks down a StringPrimary that represents an AST node, thereby generating the appropriate SQL.
+ *
+ * @param mixed
+ * @return string The SQL.
+ */
+ public function walkStringPrimary($stringPrimary)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkStringPrimary($stringPrimary);
+ }
+ }
+
+ /**
+ * Walks down an ArithmeticFactor that represents an AST node, thereby generating the appropriate SQL.
+ *
+ * @param mixed
+ * @return string The SQL.
+ */
+ public function walkArithmeticFactor($factor)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkArithmeticFactor($factor);
+ }
+ }
+
+ /**
+ * Walks down an SimpleArithmeticExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param SimpleArithmeticExpression
+ * @return string The SQL.
+ */
+ public function walkSimpleArithmeticExpression($simpleArithmeticExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkSimpleArithmeticExpression($simpleArithmeticExpr);
+ }
+ }
+
+ /**
+ * Walks down an PathExpression AST node, thereby generating the appropriate SQL.
+ *
+ * @param mixed
+ * @return string The SQL.
+ */
+ public function walkPathExpression($pathExpr)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkPathExpression($pathExpr);
+ }
+ }
+
+ /**
+ * Walks down an ResultVariable AST node, thereby generating the appropriate SQL.
+ *
+ * @param string $resultVariable
+ * @return string The SQL.
+ */
+ public function walkResultVariable($resultVariable)
+ {
+ foreach ($this->_walkers as $walker) {
+ $walker->walkResultVariable($resultVariable);
+ }
+ }
+
+ /**
+ * Gets an executor that can be used to execute the result of this walker.
+ *
+ * @return AbstractExecutor
+ */
+ public function getExecutor($AST)
+ {}
+}
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