UpdateKeysTask.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.capedwarf.datastore.stats;

import java.util.HashMap;
import java.util.Map;

import com.google.appengine.api.datastore.Key;

/**
 * Update last entity keys.
 *
 * @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
 */
public class UpdateKeysTask extends AbstractUpdateTask<Map<String, Key>> {
    private MultipleUpdate update;

    public UpdateKeysTask(MultipleUpdate update) {
        super(update);
        this.update = update;
    }

    protected Key provideKey(Map<String, Key> value) {
        return value != null ? value.get(update.triggerKind()) : null;
    }

    protected Map<String, Key> updateValue(Map<String, Key> value, Key key) {
        if (value == null) {
            value = new HashMap<String, Key>();
        }
        value.put(update.triggerKind(), key);
        return value;
    }
}