1 /***************************************************************************************
2 * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved. *
3 * http://aspectwerkz.codehaus.org *
4 * ---------------------------------------------------------------------------------- *
5 * The software in this package is published under the terms of the LGPL license *
6 * a copy of which has been included with this distribution in the license.txt file. *
7 **************************************************************************************/
8 package org.codehaus.aspectwerkz.reflect.impl.asm;
9
10 import org.codehaus.aspectwerkz.reflect.ClassInfo;
11 import org.codehaus.aspectwerkz.reflect.FieldInfo;
12 import org.codehaus.aspectwerkz.transform.inlining.AsmHelper;
13 import org.codehaus.aspectwerkz.annotation.instrumentation.asm.AsmAnnotationHelper;
14 import org.codehaus.aspectwerkz.proxy.ProxyCompiler;
15
16 import org.objectweb.asm.Type;
17 import org.objectweb.asm.ClassReader;
18 import org.objectweb.asm.attrs.Attributes;
19
20 import java.util.List;
21 import java.util.ArrayList;
22 import java.io.IOException;
23 import java.io.InputStream;
24
25 /***
26 * ASM implementation of the FieldInfo interface.
27 *
28 * @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr </a>
29 */
30 public class AsmFieldInfo extends AsmMemberInfo implements FieldInfo {
31
32 /***
33 * The field type name.
34 */
35 private String m_typeName;
36
37 /***
38 * The field type.
39 */
40 private ClassInfo m_type = null;
41
42 /***
43 * Creates a new field java instance.
44 *
45 * @param field
46 * @param declaringType
47 * @param loader
48 */
49 AsmFieldInfo(final FieldStruct field, final String declaringType, final ClassLoader loader) {
50 super(field, declaringType, loader);
51 m_typeName = Type.getType(field.desc).getClassName();
52 }
53
54 /***
55 * Returns the field info for the field specified.
56 *
57 * @param fieldName
58 * @param fieldDesc
59 * @param bytecode
60 * @param loader
61 * @return the field info
62 */
63 public static FieldInfo getFieldInfo(final String fieldName,
64 final String fieldDesc,
65 final byte[] bytecode,
66 final ClassLoader loader) {
67 String className = AsmClassInfo.retrieveClassNameFromBytecode(bytecode);
68 AsmClassInfoRepository repository = AsmClassInfoRepository.getRepository(loader);
69 ClassInfo classInfo = repository.getClassInfo(className);
70 if (classInfo == null) {
71 classInfo = AsmClassInfo.getClassInfo(bytecode, loader);
72 }
73 return classInfo.getField(AsmHelper.calculateFieldHash(fieldName, fieldDesc));
74 }
75
76 /***
77 * Returns the signature for the element.
78 *
79 * @return the signature for the element
80 */
81 public String getSignature() {
82 return AsmHelper.getFieldDescriptor(this);
83 }
84
85 /***
86 * Returns the type.
87 *
88 * @return the type
89 */
90 public ClassInfo getType() {
91 if (m_type == null) {
92 m_type = AsmClassInfo.getClassInfo(m_typeName, (ClassLoader) m_loaderRef.get());
93 }
94 return m_type;
95 }
96
97 /***
98 * Returns the annotations.
99 *
100 * @return the annotations
101 */
102 public List getAnnotations() {
103 if (m_annotations == null) {
104 try {
105 InputStream in = null;
106 ClassReader cr = null;
107 try {
108 if ((ClassLoader) m_loaderRef.get() != null) {
109 in = ((ClassLoader) m_loaderRef.get()).getResourceAsStream(
110 m_declaringTypeName.replace('.', '/') + ".class"
111 );
112 } else {
113 in = ClassLoader.getSystemClassLoader().getResourceAsStream(
114 m_declaringTypeName.replace('.', '/') + ".class"
115 );
116 }
117 if (in == null) {
118 in = ProxyCompiler.getProxyResourceAsStream((ClassLoader) m_loaderRef.get(), m_declaringTypeName);
119 }
120 cr = new ClassReader(in);
121 } finally {
122 try {
123 in.close();
124 } catch (Exception e) {
125 ;
126 }
127 }
128 List annotations = new ArrayList();
129 cr.accept(
130 new AsmAnnotationHelper.FieldAnnotationExtractor(
131 annotations, m_member.name, (ClassLoader) m_loaderRef.get()
132 ),
133 Attributes.getDefaultAttributes(),
134 true
135 );
136 m_annotations = annotations;
137 } catch (IOException e) {
138
139 System.err.println(
140 "WARN - could not load " + m_declaringTypeName + " as a resource to retrieve annotations"
141 );
142 m_annotations = AsmClassInfo.EMPTY_LIST;
143 }
144 }
145 return m_annotations;
146 }
147
148 public boolean equals(Object o) {
149 if (this == o) {
150 return true;
151 }
152 if (!(o instanceof FieldInfo)) {
153 return false;
154 }
155 FieldInfo fieldInfo = (FieldInfo) o;
156 if (!m_declaringTypeName.equals(fieldInfo.getDeclaringType().getName())) {
157 return false;
158 }
159 if (!m_member.name.equals(fieldInfo.getName())) {
160 return false;
161 }
162 if (!m_typeName.equals(fieldInfo.getType().getName())) {
163 return false;
164 }
165 return true;
166 }
167
168 public int hashCode() {
169 int result = 29;
170 result = (29 * result) + m_declaringTypeName.hashCode();
171 result = (29 * result) + m_member.name.hashCode();
172 result = (29 * result) + m_typeName.hashCode();
173 return result;
174 }
175
176 public String toString() {
177 StringBuffer sb = new StringBuffer(m_declaringTypeName);
178 sb.append('.').append(m_member.name).append(' ');
179 sb.append(m_member.desc);
180 return sb.toString();
181 }
182 }