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 *****************************************************************************/ 009 package org.picocontainer.injectors; 010 011 import java.lang.reflect.Type; 012 013 import org.picocontainer.ComponentMonitor; 014 import org.picocontainer.Injector; 015 import org.picocontainer.LifecycleStrategy; 016 import org.picocontainer.Parameter; 017 import org.picocontainer.PicoCompositionException; 018 import org.picocontainer.PicoContainer; 019 import org.picocontainer.PicoVisitor; 020 import org.picocontainer.ComponentAdapter; 021 022 @SuppressWarnings("serial") 023 public class CompositeInjector<T> extends AbstractInjector<T> { 024 025 private final Injector<T>[] injectors; 026 027 public CompositeInjector(Object componentKey, Class<?> componentImplementation, Parameter[] parameters, ComponentMonitor monitor, LifecycleStrategy lifecycleStrategy, 028 boolean useNames, Injector... injectors) { 029 super(componentKey, componentImplementation, parameters, monitor, lifecycleStrategy, useNames); 030 this.injectors = injectors; 031 } 032 033 034 public T getComponentInstance(PicoContainer container) throws PicoCompositionException { 035 return getComponentInstance(container, NOTHING.class); 036 } 037 038 public T getComponentInstance(PicoContainer container, Type into) throws PicoCompositionException { 039 T instance = null; 040 for (int i = 0; i < injectors.length; i++) { 041 Injector<T> injector = injectors[i]; 042 if (instance == null) { 043 instance = injector.getComponentInstance(container, ComponentAdapter.NOTHING.class); 044 } else { 045 injector.decorateComponentInstance(container, into, instance); 046 } 047 } 048 return (T) instance; 049 } 050 051 052 public void decorateComponentInstance(PicoContainer container, Type into, T instance) { 053 } 054 055 public void verify(PicoContainer container) throws PicoCompositionException { 056 for (int i = 0; i < injectors.length; i++) { 057 injectors[i].verify(container); 058 } 059 } 060 061 public final void accept(PicoVisitor visitor) { 062 super.accept(visitor); 063 for (int i = 0; i < injectors.length; i++) { 064 injectors[i].accept(visitor); 065 } 066 } 067 068 public String getDescriptor() { 069 return "CompositeInjector"; 070 } 071 }