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/*******************************************************************************
* Copyright (c) 2006, 2014 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.jpql.parser;
import org.eclipse.persistence.jpa.jpql.WordParser;
/**
* The WHERE clause of a query consists of a conditional expression used to select objects or
* values that satisfy the expression. The WHERE clause restricts the result of a select
* statement or the scope of an update or delete operation.
*
* BNF: where_clause ::= WHERE conditional_expression
*
* @version 2.5
* @since 2.3
* @author Pascal Filion
*/
public final class WhereClause extends AbstractConditionalClause {
/**
* Creates a new WhereClause
.
*
* @param parent The parent of this expression
*/
public WhereClause(AbstractExpression parent) {
super(parent, WHERE);
}
/**
* {@inheritDoc}
*/
@Override
protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) {
if (word.equalsIgnoreCase(SELECT) ||
word.equalsIgnoreCase(FROM)) {
return false;
}
return super.isParsingComplete(wordParser, word, expression);
}
/**
* {@inheritDoc}
*/
public void accept(ExpressionVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
*/
public JPQLQueryBNF getQueryBNF() {
return getQueryBNF(WhereClauseBNF.ID);
}
}