org.apache.openjpa.persistence.query.OrderableItem 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 an item of ORDER BY clause.
*
* @author Pinaki Poddar
*
*/
public class OrderableItem extends AbstractVisitable
implements OrderByItem, Visitable {
private static final long serialVersionUID = 1L;
private final Boolean _asc;
private final ExpressionImpl _e;
OrderableItem(ExpressionImpl path) {
this(path, null);
}
public ExpressionImpl getExpression() {
return _e;
}
OrderableItem(ExpressionImpl path, Boolean asc) {
super();
this._asc = asc;
this._e = path;
}
@Override
public String asExpression(AliasContext ctx) {
return (ctx.hasAlias(_e) ? ctx.getAlias(_e) : _e.asExpression(ctx))
+ (_asc == null ? "" : (_asc ? " ASC " : " DESC"));
}
}