/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.hql.internal.ast.tree;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.hql.internal.antlr.HqlSqlTokenTypes;
import org.hibernate.hql.internal.antlr.HqlTokenTypes;
import org.hibernate.param.ParameterSpecification;
import org.hibernate.type.Type;
import antlr.SemanticException;
import antlr.collections.AST;
/**
* @author Steve Ebersole
*/
public class InLogicOperatorNode extends BinaryLogicOperatorNode implements BinaryOperatorNode {
public Node getInList() {
return getRightHandOperand();
}
public void initialize() throws SemanticException {
Node lhs = getLeftHandOperand();
if ( lhs == null ) {
throw new SemanticException( "left-hand operand of in operator was null" );
}
Node inList = getInList();
if ( inList == null ) {
throw new SemanticException( "right-hand operand of in operator was null" );
}
// for expected parameter type injection, we expect that the lhs represents
// some form of property ref and that the children of the in-list represent
// one-or-more params.
if ( SqlNode.class.isAssignableFrom( lhs.getClass() ) ) {
Type lhsType = ( ( SqlNode ) lhs ).getDataType();
AST inListChild = inList.getFirstChild();
while ( inListChild != null ) {
if ( ExpectedTypeAwareNode.class.isAssignableFrom( inListChild.getClass() ) ) {
( ( ExpectedTypeAwareNode ) inListChild ).setExpectedType( lhsType );
}
inListChild = inListChild.getNextSibling();
}
}
SessionFactoryImplementor sessionFactory = getSessionFactoryHelper().getFactory();
if ( sessionFactory.getDialect().supportsRowValueConstructorSyntaxInInList() )
return;
Type lhsType = extractDataType( lhs );
if ( lhsType == null )
return;
int lhsColumnSpan = lhsType.getColumnSpan( sessionFactory );
Node rhsNode = (Node) inList.getFirstChild();
if ( !isNodeAcceptable( rhsNode ) )
return;
int rhsColumnSpan = 0;
if ( rhsNode.getType() == HqlTokenTypes.VECTOR_EXPR ) {
rhsColumnSpan = rhsNode.getNumberOfChildren();
} else {
Type rhsType = extractDataType( rhsNode );
if ( rhsType == null )
return;
rhsColumnSpan = rhsType.getColumnSpan( sessionFactory );
}
if ( lhsColumnSpan > 1 && rhsColumnSpan > 1 ) {
mutateRowValueConstructorSyntaxInInListSyntax( lhsColumnSpan, rhsColumnSpan );
}
}
/**
* this is possible for parameter lists and explicit lists. It is completely unreasonable for sub-queries.
*/
private boolean isNodeAcceptable( Node rhsNode ) {
return rhsNode instanceof LiteralNode
|| rhsNode instanceof ParameterNode
|| rhsNode.getType() == HqlTokenTypes.VECTOR_EXPR;
}
/**
* Mutate the subtree relating to a row-value-constructor in "in" list to instead use
* a series of ORen and ANDed predicates. This allows multi-column type comparisons
* and explicit row-value-constructor in "in" list syntax even on databases which do
* not support row-value-constructor in "in" list.
* <p/>
* For example, here we'd mutate "... where (col1, col2) in ( ('val1', 'val2'), ('val3', 'val4') ) ..." to
* "... where (col1 = 'val1' and col2 = 'val2') or (col1 = 'val3' and val2 = 'val4') ..."
*
* @param lhsColumnSpan The number of elements in the row value constructor list.
*/
private void mutateRowValueConstructorSyntaxInInListSyntax(
int lhsColumnSpan, int rhsColumnSpan ) {
String[] lhsElementTexts = extractMutationTexts( getLeftHandOperand(),
lhsColumnSpan );
Node rhsNode = (Node) getInList().getFirstChild();
ParameterSpecification lhsEmbeddedCompositeParameterSpecification = getLeftHandOperand() == null
|| ( !ParameterNode.class.isInstance( getLeftHandOperand() ) ) ? null
: ( (ParameterNode) getLeftHandOperand() )
.getHqlParameterSpecification();
/**
* only one element in "in" cluster, e.g.
* <code> where (a,b) in ( (1,2) ) </code> this will be mutated to
* <code>where a=1 and b=2 </code>
*/
if ( rhsNode != null && rhsNode.getNextSibling() == null ) {
String[] rhsElementTexts = extractMutationTexts( rhsNode,
rhsColumnSpan );
setType( HqlSqlTokenTypes.AND );
setText( "AND" );
ParameterSpecification rhsEmbeddedCompositeParameterSpecification = rhsNode == null
|| ( !ParameterNode.class.isInstance( rhsNode ) ) ? null
: ( (ParameterNode) rhsNode )
.getHqlParameterSpecification();
translate( lhsColumnSpan, HqlSqlTokenTypes.EQ, "=", lhsElementTexts,
rhsElementTexts,
lhsEmbeddedCompositeParameterSpecification,
rhsEmbeddedCompositeParameterSpecification, this );
} else {
List andElementsNodeList = new ArrayList();
while ( rhsNode != null ) {
String[] rhsElementTexts = extractMutationTexts( rhsNode,
rhsColumnSpan );
AST and = getASTFactory().create( HqlSqlTokenTypes.AND, "AND" );
ParameterSpecification rhsEmbeddedCompositeParameterSpecification = rhsNode == null
|| ( !ParameterNode.class.isInstance( rhsNode ) ) ? null
: ( (ParameterNode) rhsNode )
.getHqlParameterSpecification();
translate( lhsColumnSpan, HqlSqlTokenTypes.EQ, "=",
lhsElementTexts, rhsElementTexts,
lhsEmbeddedCompositeParameterSpecification,
rhsEmbeddedCompositeParameterSpecification, and );
andElementsNodeList.add( and );
rhsNode = (Node) rhsNode.getNextSibling();
}
setType( HqlSqlTokenTypes.OR );
setText( "OR" );
AST curNode = this;
for ( int i = andElementsNodeList.size() - 1; i > 1; i-- ) {
AST or = getASTFactory().create( HqlSqlTokenTypes.OR, "OR" );
curNode.setFirstChild( or );
curNode = or;
AST and = (AST) andElementsNodeList.get( i );
or.setNextSibling( and );
}
AST node0 = (AST) andElementsNodeList.get( 0 );
AST node1 = (AST) andElementsNodeList.get( 1 );
node0.setNextSibling( node1 );
curNode.setFirstChild( node0 );
}
}
}