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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;
import java.sql.Time;
import java.util.Date;
/**
* Denotes CURRENT_TIME(), CURRENT_DATE() and CURRENT_TIMESTAMP() expressions.
*
* @author Pinaki Poddar
*
*/
public class CurrentTimeExpression extends ExpressionImpl {
private static enum Now {
CURRENT_DATE,
CURRENT_TIME,
CURRENT_TIMESTAMP
}
private final Class _type;
public CurrentTimeExpression(Class operand) {
_type = operand;
}
@Override
public String asExpression(AliasContext ctx) {
Now now = (_type == Date.class
? Now.CURRENT_DATE
: (_type == Time.class
? Now.CURRENT_TIME : Now.CURRENT_TIMESTAMP));
return now.toString();
}
@Override
public String asProjection(AliasContext ctx) {
throw new UnsupportedOperationException();
}
}