001/*****************************************************************************
002 * Copyright (C) PicoContainer Organization. All rights reserved.            *
003 * ------------------------------------------------------------------------- *
004 * The software in this package is published under the terms of the BSD      *
005 * style license a copy of which has been included with this distribution in *
006 * the LICENSE.txt file.                                                     *
007 *****************************************************************************/
008package org.picocontainer.lifecycle;
009
010import java.io.Serializable;
011
012import org.picocontainer.ComponentAdapter;
013import org.picocontainer.ComponentMonitor;
014import org.picocontainer.ComponentMonitorStrategy;
015import org.picocontainer.LifecycleStrategy;
016
017/**
018 * Abstract base class for lifecycle strategy implementation supporting a {@link ComponentMonitor}.
019 *
020 * @author Jörg Schaible
021 */
022public abstract class AbstractMonitoringLifecycleStrategy implements LifecycleStrategy, ComponentMonitorStrategy, Serializable {
023
024        /**
025         * Component monitor that receives lifecycle state.
026         */
027    private ComponentMonitor componentMonitor;
028
029    /**
030     * Construct a AbstractMonitoringLifecycleStrategy.
031     *
032     * @param monitor the componentMonitor to use
033     * @throws NullPointerException if the monitor is <code>null</code>
034     */
035    public AbstractMonitoringLifecycleStrategy(final ComponentMonitor monitor) {
036        changeMonitor(monitor);
037    }
038
039    /**
040     * Swaps the current monitor with a replacement.
041     * @param monitor The new monitor.
042     * @throws NullPointerException if the passed in monitor is null.
043     */
044    public void changeMonitor(final ComponentMonitor monitor) {
045        if (monitor == null) {
046            throw new NullPointerException("Monitor is null");
047        }
048        this.componentMonitor = monitor;
049    }
050
051    public ComponentMonitor currentMonitor() {
052        return componentMonitor;
053    }
054
055    public boolean isLazy(ComponentAdapter<?> adapter) {
056        return false;
057    }
058
059}