/*
* 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 LOCATE(e1, e2, n) Expression.
* e1 : string to be located
* e2 : string to be searched
* n : starting poistion in e2, default is 1
*
* @author Pinaki Poddar
*
*/
public class LocateExpression extends BinaryOperatorExpression {
private final Expression _start;
public LocateExpression(Expression key, String str, int start) {
super(key, BinaryFunctionalOperator.LOCATE,
new ConstantExpression(str));
_start = new ConstantExpression(start);
}
public LocateExpression(Expression key, Expression str, int start) {
super(key, BinaryFunctionalOperator.LOCATE, str);
_start = new ConstantExpression(start);
}
public LocateExpression(Expression key, String str, Expression start) {
super(key, BinaryFunctionalOperator.LOCATE,
new ConstantExpression(str));
_start = start;
}
public LocateExpression(Expression key, Expression str, Expression start) {
super(key, BinaryFunctionalOperator.LOCATE, str);
_start = start;
}
public String asExpression(AliasContext ctx) {
String start = _start == null ? EMPTY : COMMA +
((Visitable)_start).asExpression(ctx);
return new StringBuilder(_op.toString())
.append(OPEN_BRACE)
.append(((Visitable)_e1).asExpression(ctx))
.append(COMMA)
.append(((Visitable)_e2).asExpression(ctx))
.append(start)
.append(CLOSE_BRACE).toString();
}
}