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1
25 package com.sun.el.lang;
26
27 import java.io.Externalizable  ;
28 import java.io.IOException ;
29 import java.io.ObjectInput ;
30 import java.io.ObjectOutput ;
31 import java.lang.reflect.Method ;
32 import java.util.HashMap ;
33 import java.util.Map ;
34
35 import javax.el.FunctionMapper;
36
37 import com.sun.el.util.ReflectionUtil;
38
39
43 public class FunctionMapperImpl extends FunctionMapper implements
44 Externalizable {
45
46 private static final long serialVersionUID = 1L;
47
48 protected Map functions = null;
49
50
56 public Method resolveFunction(String prefix, String localName) {
57 if (this.functions != null) {
58 Function f = (Function) this.functions.get(prefix + ":" + localName);
59 return f.getMethod();
60 }
61 return null;
62 }
63
64 public void addFunction(String prefix, String localName, Method m) {
65 if (this.functions == null) {
66 this.functions = new HashMap ();
67 }
68 Function f = new Function(prefix, localName, m);
69 synchronized (this) {
70 this.functions.put(prefix+":"+localName, f);
71 }
72 }
73
74
79 public void writeExternal(ObjectOutput out) throws IOException {
80 out.writeObject(this.functions);
81 }
82
83
88 public void readExternal(ObjectInput in) throws IOException ,
89 ClassNotFoundException {
90 this.functions = (Map ) in.readObject();
91 }
92
93 public static class Function implements Externalizable {
94
95 protected transient Method m;
96 protected String owner;
97 protected String name;
98 protected String [] types;
99 protected String prefix;
100 protected String localName;
101
102
105 public Function(String prefix, String localName, Method m) {
106 if (localName == null) {
107 throw new NullPointerException ("LocalName cannot be null");
108 }
109 if (m == null) {
110 throw new NullPointerException ("Method cannot be null");
111 }
112 this.prefix = prefix;
113 this.localName = localName;
114 this.m = m;
115 }
116
117 public Function() {
118 }
120
121
126 public void writeExternal(ObjectOutput out) throws IOException {
127
128 out.writeUTF((this.prefix != null) ? this.prefix : "");
129 out.writeUTF(this.localName);
130
131 if (this.owner != null) {
132 out.writeUTF(this.owner);
133 } else {
134 out.writeUTF(this.m.getDeclaringClass().getName());
135 }
136 if (this.name != null) {
137 out.writeUTF(this.name);
138 } else {
139 out.writeUTF(this.m.getName());
140 }
141 if (this.types != null) {
142 out.writeObject(this.types);
143 } else {
144 out.writeObject(ReflectionUtil.toTypeNameArray(this.m.getParameterTypes()));
145 }
146 }
147
148
153 public void readExternal(ObjectInput in) throws IOException ,
154 ClassNotFoundException {
155
156 this.prefix = in.readUTF();
157 if ("".equals(this.prefix)) this.prefix = null;
158 this.localName = in.readUTF();
159 this.owner = in.readUTF();
160 this.name = in.readUTF();
161 this.types = (String []) in.readObject();
162 }
163
164 public Method getMethod() {
165 if (this.m == null) {
166 try {
167 Class t = Class.forName(this.owner);
168 Class [] p = ReflectionUtil.toTypeArray(this.types);
169 this.m = t.getMethod(this.name, p);
170 } catch (Exception e) {
171 e.printStackTrace();
172 }
173 }
174 return this.m;
175 }
176
177 public boolean matches(String prefix, String localName) {
178 if (this.prefix != null) {
179 if (prefix == null) return false;
180 if (!this.prefix.equals(prefix)) return false;
181 }
182 return this.localName.equals(localName);
183 }
184
185
188 public boolean equals(Object obj) {
189 if (obj instanceof Function) {
190 return this.hashCode() == obj.hashCode();
191 }
192 return false;
193 }
194
195
198 public int hashCode() {
199 return (this.prefix + this.localName).hashCode();
200 }
201 }
202
203 }
204 |
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