openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/meta/strats/NoneDiscriminatorStrategy.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.meta.strats;

import org.apache.openjpa.jdbc.meta.Discriminator;

/**
 * No-op Discriminator strategy.
 *
 * @author Abe White
 */
public class NoneDiscriminatorStrategy
    extends AbstractDiscriminatorStrategy {

    
    private static final long serialVersionUID = 1L;

    public static final String ALIAS = "none";

    private static final NoneDiscriminatorStrategy _instance =
        new NoneDiscriminatorStrategy();

    /**
     * Return singleton instance.
     */
    public static NoneDiscriminatorStrategy getInstance() {
        return _instance;
    }

    /**
     * Hide constructor.
     */
    private NoneDiscriminatorStrategy() {
    }

    @Override
    public String getAlias() {
        return ALIAS;
    }

    @Override
    public void setDiscriminator(Discriminator owner) {
        // mark subs loaded immediately since we know there's nothing to do
        // to load them
        owner.setSubclassesLoaded(true);
    }
}