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 * 009 *****************************************************************************/ 010package org.picocontainer.injectors; 011 012import org.picocontainer.ComponentMonitor; 013import org.picocontainer.NameBinding; 014import org.picocontainer.Parameter; 015import org.picocontainer.PicoContainer; 016import org.picocontainer.annotations.Bind; 017 018import java.lang.annotation.Annotation; 019import java.lang.reflect.*; 020import java.security.AccessController; 021import java.security.PrivilegedAction; 022import java.util.ArrayList; 023import java.util.Arrays; 024import java.util.Collections; 025import java.util.List; 026import java.util.Set; 027 028/** 029 * Injection happens after instantiation, and fields are marked as 030 * injection points via a field type. 031 */ 032@SuppressWarnings("serial") 033public class TypedFieldInjector<T> extends AbstractFieldInjector<T> { 034 035 private final List<String> classes; 036 037 public TypedFieldInjector(Object key, 038 Class<?> impl, 039 Parameter[] parameters, 040 ComponentMonitor componentMonitor, 041 String classNames) { 042 super(key, impl, parameters, componentMonitor, true); 043 this.classes = Arrays.asList(classNames.trim().split(" ")); 044 } 045 046 @Override 047 protected void initializeInjectionMembersAndTypeLists() { 048 injectionMembers = new ArrayList<AccessibleObject>(); 049 List<Annotation> bindingIds = new ArrayList<Annotation>(); 050 final List<Type> typeList = new ArrayList<Type>(); 051 final Field[] fields = getFields(); 052 for (final Field field : fields) { 053 if (isTypedForInjection(field)) { 054 injectionMembers.add(field); 055 typeList.add(box(field.getType())); 056 bindingIds.add(getBinding(field)); 057 } 058 } 059 injectionTypes = typeList.toArray(new Type[0]); 060 bindings = bindingIds.toArray(new Annotation[0]); 061 } 062 063 private Annotation getBinding(Field field) { 064 Annotation[] annotations = field.getAnnotations(); 065 for (Annotation annotation : annotations) { 066 if (annotation.annotationType().isAnnotationPresent(Bind.class)) { 067 return annotation; 068 } 069 } 070 return null; 071 } 072 073 protected boolean isTypedForInjection(Field field) { 074 return classes.contains(field.getType().getName()); 075 } 076 077 private Field[] getFields() { 078 return AccessController.doPrivileged(new PrivilegedAction<Field[]>() { 079 public Field[] run() { 080 return getComponentImplementation().getDeclaredFields(); 081 } 082 }); 083 } 084 085 086 protected Object injectIntoMember(AccessibleObject member, Object componentInstance, Object toInject) 087 throws IllegalAccessException, InvocationTargetException { 088 Field field = (Field) member; 089 field.setAccessible(true); 090 field.set(componentInstance, toInject); 091 return null; 092 } 093 094 @Override 095 public String getDescriptor() { 096 return "TypedFieldInjector-"; 097 } 098 099 @Override 100 protected NameBinding makeParameterNameImpl(final AccessibleObject member) { 101 return new NameBinding() { 102 public String getName() { 103 return ((Field) member).getName(); 104 } 105 }; 106 } 107 108 protected Object memberInvocationReturn(Object lastReturn, AccessibleObject member, Object instance) { 109 return instance; 110 } 111 112 List<String> getInjectionFieldTypes() { 113 return Collections.unmodifiableList(classes); 114 } 115 116 117}