/*
* 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 SUBSTR(a,i1,i2) Expression.
*
* @author Pinaki Poddar
*
*/
public class SubStringExpression extends UnaryOperatorExpression {
private final Expression _start;
private final Expression _length;
public SubStringExpression(Expression op, Expression start) {
super(op, UnaryFunctionalOperator.SUBSTR);
_start = start;
_length = null;
}
public SubStringExpression(Expression op, int start) {
super(op, UnaryFunctionalOperator.SUBSTR);
_start = new ConstantExpression(start);
_length = null;
}
public SubStringExpression(Expression op, int start, int len) {
super(op, UnaryFunctionalOperator.SUBSTR);
_start = new ConstantExpression(start);
_length = new ConstantExpression(len);
}
public SubStringExpression(Expression op, Expression start, Expression l) {
super(op, UnaryFunctionalOperator.SUBSTR);
_start = start;
_length = new ConstantExpression(l);
}
public String asExpression(AliasContext ctx) {
return _op + "(" + ((Visitable)_e).asExpression(ctx)
+ "," + ((Visitable)_start).asExpression(ctx)
+ (_length == null ? "" : ","
+ ((Visitable)_length).asExpression(ctx)) + ")";
}
}