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