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 * Original code by Mauro Talevi * 009 *****************************************************************************/ 010 package org.picocontainer.defaults; 011 012 import java.io.Serializable; 013 014 import org.picocontainer.ComponentMonitor; 015 016 /** 017 * Abstract {@link ComponentAdapterFactory ComponentAdapterFactory} supporting a 018 * {@link ComponentMonitorStrategy ComponentMonitorStrategy}. 019 * It provides a {@link DelegatingComponentMonitor default ComponentMonitor}, 020 * but does not allow to use <code>null</code> for the component monitor. 021 * 022 * @author Mauro Talevi 023 * @see ComponentAdapterFactory 024 * @see ComponentMonitorStrategy 025 * @since 1.2 026 */ 027 public abstract class MonitoringComponentAdapterFactory implements ComponentAdapterFactory, ComponentMonitorStrategy, Serializable { 028 private ComponentMonitor componentMonitor; 029 030 /** 031 * Constructs a MonitoringComponentAdapterFactory with a custom monitor 032 * @param monitor the ComponentMonitor used by the factory 033 */ 034 protected MonitoringComponentAdapterFactory(ComponentMonitor monitor) { 035 if (monitor == null){ 036 throw new NullPointerException("componentMonitor"); 037 } 038 this.componentMonitor = monitor; 039 } 040 041 /** 042 * Constructs a MonitoringComponentAdapterFactory with a {@link DelegatingComponentMonitor default monitor}. 043 */ 044 protected MonitoringComponentAdapterFactory() { 045 this(new DelegatingComponentMonitor()); 046 } 047 048 public void changeMonitor(ComponentMonitor monitor) { 049 this.componentMonitor = monitor; 050 } 051 052 /** 053 * Returns the monitor currently used 054 * @return The ComponentMonitor currently used 055 */ 056 public ComponentMonitor currentMonitor(){ 057 return componentMonitor; 058 } 059 060 }