openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/kernel/exps/CurrentDate.java

/*
 * 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.jdbc.kernel.exps;

import java.util.Date;

import org.apache.openjpa.jdbc.meta.JavaSQLTypes;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.util.InternalException;

/**
 * A literal current DATE/TIME/TIMESTAMP value in a filter.
 *
 * @author Marc Prud'hommeaux
 */
class CurrentDate
    extends Const {

    private final int _type;

    public CurrentDate(int type) {
        _type = type;
    }

    public Class getType() {
        return Date.class;
    }

    public void setImplicitType(Class type) {
    }

    public Object getValue(Object[] params) {
        return new Date();
    }

    public void appendTo(Select sel, ExpContext ctx, ExpState state, 
        SQLBuffer sql, int index) {
        switch (_type) {
            case JavaSQLTypes.DATE:
                sql.append(ctx.store.getDBDictionary().currentDateFunction);
                break;
            case JavaSQLTypes.TIME:
                sql.append(ctx.store.getDBDictionary().currentTimeFunction);
                break;
            case JavaSQLTypes.TIMESTAMP:
                sql.append(ctx.store.getDBDictionary().
                    currentTimestampFunction);
                break;
            default:
                throw new InternalException();
        }
    }
}