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 *****************************************************************************/ 009package org.picocontainer.behaviors; 010 011import org.picocontainer.ComponentAdapter; 012import org.picocontainer.LifecycleStrategy; 013import org.picocontainer.ObjectReference; 014import org.picocontainer.PicoCompositionException; 015import org.picocontainer.PicoContainer; 016import org.picocontainer.ComponentLifecycle; 017 018import java.lang.reflect.Type; 019import java.io.Serializable; 020 021/** 022 * behaviour for allows components to be guarded by another component 023 * 024 * @author Paul Hammant 025 * @param <T> 026 */ 027@SuppressWarnings("serial") 028public class Guarded<T> extends AbstractBehavior<T> { 029 private final String guard; 030 031 public Guarded(ComponentAdapter delegate, String guard) { 032 super(delegate); 033 this.guard = guard; 034 } 035 036 public T getComponentInstance(PicoContainer container, Type into) throws PicoCompositionException { 037 container.getComponent(guard); 038 return super.getComponentInstance(container, into); 039 } 040 041 public String getDescriptor() { 042 return "Guarded(with " + guard + ")"; 043 } 044 045 046}