org.apache.openjpa.persistence.query.LikeExpression Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package org.apache.openjpa.persistence.query;

/**
 * Denotes e1 LIKE e2 Expression.
 * 
 * @author Pinaki Poddar
 *
 */
public class LikeExpression extends BinaryExpressionPredicate {
	private final Object  _echar;
	private final boolean _escaped;
	
	public LikeExpression(Expression e, Expression pattern, Object echar) {
		super(e, BinaryConditionalOperator.LIKE, 
			BinaryConditionalOperator.LIKE_NOT, pattern);
		_echar = echar;
		_escaped = true;
	}
	
	public LikeExpression(Expression e, Expression pattern) {
		super(e, BinaryConditionalOperator.LIKE, 
			BinaryConditionalOperator.LIKE_NOT, pattern);
		
		_echar = null;
		_escaped = false;
	}
	
	@Override
	public String asExpression(AliasContext ctx) {
		return super.asExpression(ctx) +
            (_escaped ? "ESCAPE " + JPQLHelper.toJPQL(ctx, _echar) : EMPTY);
	}

}