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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 javax.el;
import java.beans.FeatureDescriptor;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Iterator;
import java.util.Objects;
/**
* @since EL 3.0
*/
public class StaticFieldELResolver extends ELResolver {
@Override
public Object getValue(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base instanceof ELClass && property instanceof String) {
context.setPropertyResolved(base, property);
Class<?> clazz = ((ELClass) base).getKlass();
String name = (String) property;
Exception exception = null;
try {
Field field = clazz.getField(name);
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers) &&
Modifier.isPublic(modifiers)) {
return field.get(null);
}
} catch (IllegalArgumentException | IllegalAccessException
| NoSuchFieldException | SecurityException e) {
exception = e;
}
String msg = Util.message(context, "staticFieldELResolver.notFound",
name, clazz.getName());
if (exception == null) {
throw new PropertyNotFoundException(msg);
} else {
throw new PropertyNotFoundException(msg, exception);
}
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property,
Object value) {
Objects.requireNonNull(context);
if (base instanceof ELClass && property instanceof String) {
Class<?> clazz = ((ELClass) base).getKlass();
String name = (String) property;
throw new PropertyNotWritableException(Util.message(context,
"staticFieldELResolver.notWriteable", name,
clazz.getName()));
}
}
@Override
public Object invoke(ELContext context, Object base, Object method,
Class<?>[] paramTypes, Object[] params) {
Objects.requireNonNull(context);
if (base instanceof ELClass && method instanceof String) {
context.setPropertyResolved(base, method);
Class<?> clazz = ((ELClass) base).getKlass();
String methodName = (String) method;
if ("<init>".equals(methodName)) {
Constructor<?> match =
Util.findConstructor(clazz, paramTypes, params);
Object[] parameters = Util.buildParameters(
match.getParameterTypes(), match.isVarArgs(), params);
Object result = null;
try {
result = match.newInstance(parameters);
} catch (IllegalArgumentException | IllegalAccessException |
InstantiationException e) {
throw new ELException(e);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
Util.handleThrowable(cause);
throw new ELException(cause);
}
return result;
} else {
Method match =
Util.findMethod(clazz, methodName, paramTypes, params);
int modifiers = match.getModifiers();
if (!Modifier.isStatic(modifiers)) {
throw new MethodNotFoundException(Util.message(context,
"staticFieldELResolver.methodNotFound", methodName,
clazz.getName()));
}
Object[] parameters = Util.buildParameters(
match.getParameterTypes(), match.isVarArgs(), params);
Object result = null;
try {
result = match.invoke(null, parameters);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new ELException(e);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
Util.handleThrowable(cause);
throw new ELException(cause);
}
return result;
}
}
return null;
}
@Override
public Class<?> getType(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base instanceof ELClass && property instanceof String) {
context.setPropertyResolved(base, property);
Class<?> clazz = ((ELClass) base).getKlass();
String name = (String) property;
Exception exception = null;
try {
Field field = clazz.getField(name);
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers) &&
Modifier.isPublic(modifiers)) {
return field.getType();
}
} catch (IllegalArgumentException | NoSuchFieldException |
SecurityException e) {
exception = e;
}
String msg = Util.message(context, "staticFieldELResolver.notFound",
name, clazz.getName());
if (exception == null) {
throw new PropertyNotFoundException(msg);
} else {
throw new PropertyNotFoundException(msg, exception);
}
}
return null;
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base instanceof ELClass && property instanceof String) {
context.setPropertyResolved(base, property);
}
return true;
}
/**
* Always returns <code>null</code>.
*/
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
Object base) {
return null;
}
/**
* Always returns <code>String.class</code>.
*/
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base) {
return String.class;
}
}
|
