/*
* 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 TRIM(e1,x) Expression.
*
* @author Pinaki Poddar
*
*/
public class TrimExpression extends UnaryOperatorExpression {
private final Expression _trimChar;
private final TrimSpec _trimSpec;
private static final String DEFAULT_TRIM_CHAR = "' '";
private static final String DEFAULT_TRIM_SPEC = EMPTY;
public TrimExpression(Expression op, char ch, TrimSpec spec) {
super(op, UnaryFunctionalOperator.TRIM);
_trimChar = new ConstantExpression(ch);
_trimSpec = spec;
}
public TrimExpression(Expression op, Expression ch, TrimSpec spec) {
super(op, UnaryFunctionalOperator.TRIM);
_trimChar = ch;
_trimSpec = spec;
}
public String asExpression(AliasContext ctx) {
String trimChar = _trimChar == null ? DEFAULT_TRIM_CHAR
: ((Visitable)_trimChar).asExpression(ctx);
String trimSpec = _trimSpec == null ? DEFAULT_TRIM_SPEC :
_trimSpec.toString();
return _op.toString()
+ OPEN_BRACE
+ trimSpec
+ SPACE
+ trimChar
+ " FROM "
+ ((Visitable)_e).asExpression(ctx)
+ CLOSE_BRACE;
}
}