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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.xbean.kernel;

import java.util.Set;
import java.util.Collections;
import java.util.HashSet;

/**
 * AbstractServiceFactory is an implementation of ServiceFactory that handles all of the mundane issues.
 *
 * @author Dain Sundstrom
 * @version $Id$
 * @since 2.0
 */
public abstract class AbstractServiceFactory implements ServiceFactory {
    private boolean enabled = true;
    private final Set startConditions = new HashSet();
    private final Set stopConditions = new HashSet();

    /**
     * {@inheritDoc}
     */
    public synchronized boolean isEnabled() {
        return enabled;
    }

    /**
     * {@inheritDoc}
     */
    public synchronized void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

    /**
     * {@inheritDoc}
     */
    public synchronized Set getStartConditions() {
        return Collections.unmodifiableSet(new HashSet(startConditions));
    }

    /**
     * {@inheritDoc}
     */
    public synchronized void addStartCondition(ServiceCondition startCondition) throws NullPointerException {
        if (startCondition == null) throw new NullPointerException("startCondition is null");
        startConditions.add(startCondition);
    }

    /**
     * {@inheritDoc}
     */
    public synchronized void removeStartCondition(ServiceCondition startCondition) throws NullPointerException {
        if (startCondition == null) throw new NullPointerException("startCondition is null");
        startConditions.remove(startCondition);
    }

    /**
     * {@inheritDoc}
     */
    public synchronized Set getStopConditions() {
        return Collections.unmodifiableSet(new HashSet(stopConditions));
    }

    /**
     * {@inheritDoc}
     */
    public synchronized void addStopCondition(ServiceCondition stopCondition) throws NullPointerException {
        if (stopCondition == null) throw new NullPointerException("stopCondition is null");
        stopConditions.add(stopCondition);
    }

    /**
     * {@inheritDoc}
     */
    public synchronized void removeStopCondition(ServiceCondition stopCondition) throws NullPointerException {
        if (stopCondition == null) throw new NullPointerException("stopCondition is null");
        stopConditions.remove(stopCondition);
    }
}