-
Notifications
You must be signed in to change notification settings - Fork 78
/
AnnotationLiteral.java
299 lines (281 loc) · 12.5 KB
/
AnnotationLiteral.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
/*
* JBoss, Home of Professional Open Source
* Copyright 2018, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jakarta.enterprise.util;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import jakarta.enterprise.event.Event;
import jakarta.enterprise.inject.Instance;
/**
* <p>
* Supports inline instantiation of annotation type instances.
* </p>
*
* <p>
* Reflection operations are using {@link SecurityActions} utility class to support security manager.
* </p>
*
* <p>
* An instance of an annotation type may be obtained by subclassing <code>AnnotationLiteral</code>.
* </p>
*
* <pre>
* public abstract class PayByQualifier extends AnnotationLiteral<PayBy> implements PayBy {
* }
* </pre>
*
* <pre>
* PayBy payByCheque = new PayByQualifier() {
* public PaymentMethod value() {
* return CHEQUE;
* }
* };
* </pre>
*
* @author Pete Muir
* @author Gavin King
* @author Marko Luksa
* @author Antoine Sabot-Durand
*
* @param <T> the annotation type
*
* @see Instance#select(Annotation...)
* @see Event#select(Annotation...)
*
*/
public abstract class AnnotationLiteral<T extends Annotation> implements Annotation, Serializable {
private static final long serialVersionUID = 1L;
private transient Class<T> annotationType;
private transient Method[] members;
private transient Integer cachedHashCode;
protected AnnotationLiteral() {
}
private Method[] getMembers() {
if (members == null) {
members = SecurityActions.getDeclaredMethods(annotationType());
if (members.length > 0 && !annotationType().isAssignableFrom(this.getClass())) {
throw new RuntimeException(getClass() + " does not implement the annotation type with members "
+ annotationType().getName());
}
if (members.length == 0) {
this.cachedHashCode = 0;
} else {
this.cachedHashCode = null;
}
}
return members;
}
private static Class<?> getAnnotationLiteralSubclass(Class<?> clazz) {
Class<?> superclass = clazz.getSuperclass();
if (superclass.equals(AnnotationLiteral.class)) {
return clazz;
} else if (superclass.equals(Object.class)) {
return null;
} else {
return (getAnnotationLiteralSubclass(superclass));
}
}
@SuppressWarnings("unchecked")
private static <T> Class<T> getTypeParameter(Class<?> annotationLiteralSuperclass) {
Type type = annotationLiteralSuperclass.getGenericSuperclass();
if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
if (parameterizedType.getActualTypeArguments().length == 1) {
return (Class<T>) parameterizedType.getActualTypeArguments()[0];
}
}
return null;
}
public Class<? extends Annotation> annotationType() {
if (annotationType == null) {
Class<?> annotationLiteralSubclass = getAnnotationLiteralSubclass(this.getClass());
if (annotationLiteralSubclass == null) {
throw new RuntimeException(getClass() + " is not a subclass of AnnotationLiteral");
}
annotationType = getTypeParameter(annotationLiteralSubclass);
if (annotationType == null) {
throw new RuntimeException(getClass() + " does not specify the type parameter T of AnnotationLiteral<T>");
}
}
return annotationType;
}
@Override
public String toString() {
StringBuilder string = new StringBuilder();
string.append('@').append(annotationType().getName()).append('(');
for (int i = 0; i < getMembers().length; i++) {
string.append(getMembers()[i].getName()).append('=');
Object value = getMemberValue(getMembers()[i], this);
if (value instanceof boolean[]) {
appendInBraces(string, Arrays.toString((boolean[]) value));
} else if (value instanceof byte[]) {
appendInBraces(string, Arrays.toString((byte[]) value));
} else if (value instanceof short[]) {
appendInBraces(string, Arrays.toString((short[]) value));
} else if (value instanceof int[]) {
appendInBraces(string, Arrays.toString((int[]) value));
} else if (value instanceof long[]) {
appendInBraces(string, Arrays.toString((long[]) value));
} else if (value instanceof float[]) {
appendInBraces(string, Arrays.toString((float[]) value));
} else if (value instanceof double[]) {
appendInBraces(string, Arrays.toString((double[]) value));
} else if (value instanceof char[]) {
appendInBraces(string, Arrays.toString((char[]) value));
} else if (value instanceof String[]) {
String[] strings = (String[]) value;
String[] quoted = new String[strings.length];
for (int j = 0; j < strings.length; j++) {
quoted[j] = "\"" + strings[j] + "\"";
}
appendInBraces(string, Arrays.toString(quoted));
} else if (value instanceof Class<?>[]) {
Class<?>[] classes = (Class<?>[]) value;
String[] names = new String[classes.length];
for (int j = 0; j < classes.length; j++) {
names[j] = classes[j].getName() + ".class";
}
appendInBraces(string, Arrays.toString(names));
} else if (value instanceof Object[]) {
appendInBraces(string, Arrays.toString((Object[]) value));
} else if (value instanceof String) {
string.append('"').append(value).append('"');
} else if (value instanceof Class<?>) {
string.append(((Class<?>) value).getName()).append(".class");
} else {
string.append(value);
}
if (i < getMembers().length - 1) {
string.append(", ");
}
}
return string.append(')').toString();
}
private void appendInBraces(StringBuilder buf, String s) {
buf.append('{').append(s, 1, s.length() - 1).append('}');
}
@Override
public boolean equals(Object other) {
if (other == this) {
return true;
}
if (other == null) {
return false;
}
if (other instanceof Annotation) {
Annotation that = (Annotation) other;
if (this.annotationType().equals(that.annotationType())) {
for (Method member : getMembers()) {
Object thisValue = getMemberValue(member, this);
Object thatValue = getMemberValue(member, that);
if (thisValue instanceof byte[] && thatValue instanceof byte[]) {
if (!Arrays.equals((byte[]) thisValue, (byte[]) thatValue))
return false;
} else if (thisValue instanceof short[] && thatValue instanceof short[]) {
if (!Arrays.equals((short[]) thisValue, (short[]) thatValue))
return false;
} else if (thisValue instanceof int[] && thatValue instanceof int[]) {
if (!Arrays.equals((int[]) thisValue, (int[]) thatValue))
return false;
} else if (thisValue instanceof long[] && thatValue instanceof long[]) {
if (!Arrays.equals((long[]) thisValue, (long[]) thatValue))
return false;
} else if (thisValue instanceof float[] && thatValue instanceof float[]) {
if (!Arrays.equals((float[]) thisValue, (float[]) thatValue))
return false;
} else if (thisValue instanceof double[] && thatValue instanceof double[]) {
if (!Arrays.equals((double[]) thisValue, (double[]) thatValue))
return false;
} else if (thisValue instanceof char[] && thatValue instanceof char[]) {
if (!Arrays.equals((char[]) thisValue, (char[]) thatValue))
return false;
} else if (thisValue instanceof boolean[] && thatValue instanceof boolean[]) {
if (!Arrays.equals((boolean[]) thisValue, (boolean[]) thatValue))
return false;
} else if (thisValue instanceof Object[] && thatValue instanceof Object[]) {
if (!Arrays.equals((Object[]) thisValue, (Object[]) thatValue))
return false;
} else {
if (!thisValue.equals(thatValue))
return false;
}
}
return true;
}
}
return false;
}
@Override
public int hashCode() {
Method[] members = getMembers(); // init cachedHashCode
if (cachedHashCode != null) {
return cachedHashCode;
} else {
int hashCode = 0;
for (Method member : members) {
int memberNameHashCode = 127 * member.getName().hashCode();
Object value = getMemberValue(member, this);
int memberValueHashCode;
if (value instanceof boolean[]) {
memberValueHashCode = Arrays.hashCode((boolean[]) value);
} else if (value instanceof short[]) {
memberValueHashCode = Arrays.hashCode((short[]) value);
} else if (value instanceof int[]) {
memberValueHashCode = Arrays.hashCode((int[]) value);
} else if (value instanceof long[]) {
memberValueHashCode = Arrays.hashCode((long[]) value);
} else if (value instanceof float[]) {
memberValueHashCode = Arrays.hashCode((float[]) value);
} else if (value instanceof double[]) {
memberValueHashCode = Arrays.hashCode((double[]) value);
} else if (value instanceof byte[]) {
memberValueHashCode = Arrays.hashCode((byte[]) value);
} else if (value instanceof char[]) {
memberValueHashCode = Arrays.hashCode((char[]) value);
} else if (value instanceof Object[]) {
memberValueHashCode = Arrays.hashCode((Object[]) value);
} else {
memberValueHashCode = value.hashCode();
}
hashCode += memberNameHashCode ^ memberValueHashCode;
}
return hashCode;
}
}
private static Object getMemberValue(Method member, Annotation instance) {
Object value = invoke(member, instance);
if (value == null) {
throw new IllegalArgumentException("Annotation member value " + instance.getClass().getName() + "."
+ member.getName() + " must not be null");
}
return value;
}
private static Object invoke(Method method, Object instance) {
try {
if (!method.isAccessible())
SecurityActions.setAccessible(method);
return method.invoke(instance);
} catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException("Error checking value of member method " + method.getName() + " on "
+ method.getDeclaringClass(), e);
}
}
}