This repository was archived by the owner on Jan 30, 2019. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 10
Expand file tree
/
Copy pathELManager.java
More file actions
191 lines (175 loc) · 7.19 KB
/
ELManager.java
File metadata and controls
191 lines (175 loc) · 7.19 KB
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
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.el;
import java.lang.reflect.Method;
/**
* <p>Manages EL parsing and evaluation environment. The ELManager maintains an
* instance of ExpressionFactory and StandardELContext, for
* parsing and evaluating EL expressions.</p>
*
* @since EL 3.0
*/
public class ELManager {
private StandardELContext elContext;
/**
* Return the ExpressionFactory instance used for EL evaluations.
* @return The ExpressionFactory
*/
public static ExpressionFactory getExpressionFactory() {
return ELUtil.getExpressionFactory();
}
/**
* Return the ELContext used for parsing and evaluating EL expressions.
* If there is currently no ELContext, a default instance of
* StandardELContext is returned.
*
* @return The ELContext used for parsing and evaluating EL expressions..
*/
public StandardELContext getELContext() {
if (elContext == null) {
elContext = new StandardELContext(getExpressionFactory());
}
return elContext;
}
/**
* Set the ELContext used for parsing and evaluating EL expressions.
* The supplied ELContext will not be modified, except for the context
* object map.
* @param context The new ELContext.
* @return The previous ELContext, null if none.
*/
public ELContext setELContext(ELContext context) {
ELContext prev = elContext;
elContext = new StandardELContext(context);
return prev;
}
/**
* Register a BeanNameResolver.
* Construct a BeanNameELResolver with the BeanNameResolver and add it
* to the list of ELResolvers.
* Once registered, the BeanNameResolver cannot be removed.
* @param bnr The BeanNameResolver to be registered.
*/
public void addBeanNameResolver(BeanNameResolver bnr) {
getELContext().addELResolver(new BeanNameELResolver(bnr));
}
/**
* Add an user defined ELResolver to the list of ELResolvers.
* Can be called multiple times. The new ELResolver is
* placed ahead of the default ELResolvers. The list of the ELResolvers
* added this way are ordered chronologically.
*
* @param elr The ELResolver to be added to the list of ELResolvers in
* ELContext.
* @see StandardELContext#addELResolver
*/
public void addELResolver(ELResolver elr) {
getELContext().addELResolver(elr);
}
/**
* Maps a static method to an EL function.
* @param prefix The namespace of the functions, can be "".
* @param function The name of the function.
* @param meth The static method to be invoked when the function is used.
*/
public void mapFunction(String prefix, String function, Method meth) {
getELContext().getFunctionMapper().mapFunction(prefix, function, meth);
}
/**
* Assign a ValueExpression to an EL variable, replacing
* any previous assignment to the same variable.
* The assignment for the variable is removed if
* the expression is <code>null</code>.
*
* @param variable The variable name
* @param expression The ValueExpression to be assigned
* to the variable.
*/
public void setVariable(String variable, ValueExpression expression) {
getELContext().getVariableMapper().setVariable(variable, expression);
}
/**
* Import a static field or method. The class of the static member must be
* loadable from the classloader, at class resolution time.
* @param staticMemberName The full class name of the class to be imported
* @throws ELException if the name is not a full class name.
*/
public void importStatic(String staticMemberName) throws ELException {
getELContext().getImportHandler().importStatic(staticMemberName);
}
/**
* Import a class. The imported class must be loadable from the classloader
* at the expression evaluation time.
* @param className The full class name of the class to be imported
* @throws ELException if the name is not a full class name.
*/
public void importClass(String className) throws ELException {
getELContext().getImportHandler().importClass(className);
}
/**
* Import a package. At the expression evaluation time, the imported package
* name will be used to construct the full class name, which will then be
* used to load the class. Inherently, this is less efficient than
* importing a class.
* @param packageName The package name to be imported
*/
public void importPackage(String packageName) {
getELContext().getImportHandler().importPackage(packageName);
}
/**
* Define a bean in the local bean repository
* @param name The name of the bean
* @param bean The bean instance to be defined. If null, the definition
* of the bean is removed.
*/
public Object defineBean(String name, Object bean) {
Object ret = getELContext().getBeans().get(name);
getELContext().getBeans().put(name, bean);
return ret;
}
/**
* Register an evaluation listener.
*
* @param listener The evaluation listener to be added.
*/
public void addEvaluationListener(EvaluationListener listener) {
getELContext().addEvaluationListener(listener);
}
}