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     *****************************************************************************/
008    package org.picocontainer.defaults;
009    
010    import org.picocontainer.ComponentMonitor;
011    
012    import java.io.Serializable;
013    
014    /**
015     * Abstract base class for lifecycle strategy implementation supporting a {@link ComponentMonitor}.
016     * 
017     * @author Jörg Schaible
018     * @since 1.2
019     */
020    public abstract class AbstractMonitoringLifecycleStrategy implements LifecycleStrategy, ComponentMonitorStrategy, Serializable {
021    
022        private ComponentMonitor componentMonitor;
023    
024        /**
025         * Construct a AbstractMonitoringLifecylceStrategy.
026         * 
027         * @param monitor the componentMonitor to use
028         * @throws NullPointerException if the monitor is <code>null</code>
029         */
030        public AbstractMonitoringLifecycleStrategy(ComponentMonitor monitor) {
031            if (monitor == null) {
032                throw new NullPointerException("Monitor is null");
033            }
034            this.componentMonitor = monitor;
035        }
036        
037        public void changeMonitor(ComponentMonitor monitor) {
038            if (monitor == null) {
039                throw new NullPointerException("Monitor is null");
040            }
041            this.componentMonitor = monitor;
042        }
043    
044        public ComponentMonitor currentMonitor() {
045            return componentMonitor;
046        }
047    
048    }