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1
29
30 package com.caucho.el;
31
32 import javax.el.ELContext;
33 import javax.el.ELResolver;
34 import java.beans.FeatureDescriptor  ;
35 import java.util.ArrayList ;
36 import java.util.Iterator ;
37
38
41 public class StackELResolver extends ELResolver {
42 public final ArrayList <ELResolver> _resolverStack
43 = new ArrayList <ELResolver>();
44
45 public StackELResolver()
46 {
47 }
48
49 public void push(ELResolver elResolver)
50 {
51 if (elResolver == null)
52 throw new NullPointerException ();
53
54 _resolverStack.add(elResolver);
55 }
56
57 public ELResolver pop()
58 {
59 if (_resolverStack.size() > 0)
60 return _resolverStack.remove(_resolverStack.size() - 1);
61 else
62 return null;
63 }
64
65 @Override
66 public Class <?> getCommonPropertyType(ELContext env, Object base)
67 {
68 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
69 ELResolver resolver = _resolverStack.get(i);
70
71 return getCommonPropertyType(env, base);
72 }
73
74 return null;
75 }
76
77 @Override
78 public Iterator <FeatureDescriptor > getFeatureDescriptors(ELContext env,
79 Object base)
80 {
81 ArrayList <FeatureDescriptor > descriptors = null;
82
83 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
84 ELResolver resolver = _resolverStack.get(i);
85
86 Iterator <FeatureDescriptor > iter
87 = resolver.getFeatureDescriptors(env, base);
88
89 if (iter == null)
90 continue;
91
92 if (descriptors == null)
93 descriptors = new ArrayList <FeatureDescriptor >();
94
95 while (iter.hasNext()) {
96 FeatureDescriptor desc = iter.next();
97
98 descriptors.add(desc);
99 }
100 }
101
102 if (descriptors != null)
103 return descriptors.iterator();
104 else
105 return null;
106 }
107
108 @Override
109 public Class <?> getType(ELContext context,
110 Object base,
111 Object property)
112 {
113 context.setPropertyResolved(false);
114
115 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
116 ELResolver resolver = _resolverStack.get(i);
117
118 Class type = resolver.getType(context, base, property);
119
120 if (context.isPropertyResolved())
121 return type;
122 }
123
124 return null;
125 }
126
127 @Override
128 public Object getValue(ELContext context,
129 Object base,
130 Object property)
131 {
132 context.setPropertyResolved(false);
133
134 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
135 ELResolver resolver = _resolverStack.get(i);
136
137 Object value = resolver.getValue(context, base, property);
138
139 if (context.isPropertyResolved()) {
140 return value;
141 }
142 }
143
144 return null;
145 }
146
147 @Override
148 public boolean isReadOnly(ELContext context,
149 Object base,
150 Object property)
151 {
152 context.setPropertyResolved(false);
153
154 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
155 ELResolver resolver = _resolverStack.get(i);
156
157 boolean isReadOnly = resolver.isReadOnly(context, base, property);
158
159 if (context.isPropertyResolved())
160 return isReadOnly;
161 }
162
163 return false;
164 }
165
166 @Override
167 public void setValue(ELContext context,
168 Object base,
169 Object property,
170 Object value)
171 {
172 context.setPropertyResolved(false);
173
174 for (int i = _resolverStack.size() - 1; i >= 0; i--) {
175 ELResolver resolver = _resolverStack.get(i);
176
177 resolver.setValue(context, base, property, value);
178
179 if (context.isPropertyResolved()) {
180 return;
181 }
182 }
183 }
184 }
185 |
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