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1
17
18 package org.apache.el.lang;
19
20 import java.io.Externalizable  ;
21 import java.io.IOException ;
22 import java.io.ObjectInput ;
23 import java.io.ObjectOutput ;
24 import java.lang.reflect.Method ;
25 import java.util.HashMap ;
26 import java.util.Map ;
27
28 import javax.el.FunctionMapper;
29
30 import org.apache.el.util.ReflectionUtil;
31
32
33
37 public class FunctionMapperImpl extends FunctionMapper implements
38 Externalizable {
39
40 private static final long serialVersionUID = 1L;
41
42 protected Map functions = null;
43
44
50 public Method resolveFunction(String prefix, String localName) {
51 if (this.functions != null) {
52 Function f = (Function) this.functions.get(prefix + ":" + localName);
53 return f.getMethod();
54 }
55 return null;
56 }
57
58 public void addFunction(String prefix, String localName, Method m) {
59 if (this.functions == null) {
60 this.functions = new HashMap ();
61 }
62 Function f = new Function(prefix, localName, m);
63 synchronized (this) {
64 this.functions.put(prefix+":"+localName, f);
65 }
66 }
67
68
73 public void writeExternal(ObjectOutput out) throws IOException {
74 out.writeObject(this.functions);
75 }
76
77
82 public void readExternal(ObjectInput in) throws IOException ,
83 ClassNotFoundException {
84 this.functions = (Map ) in.readObject();
85 }
86
87 public static class Function implements Externalizable {
88
89 protected transient Method m;
90 protected String owner;
91 protected String name;
92 protected String [] types;
93 protected String prefix;
94 protected String localName;
95
96
99 public Function(String prefix, String localName, Method m) {
100 if (localName == null) {
101 throw new NullPointerException ("LocalName cannot be null");
102 }
103 if (m == null) {
104 throw new NullPointerException ("Method cannot be null");
105 }
106 this.prefix = prefix;
107 this.localName = localName;
108 this.m = m;
109 }
110
111 public Function() {
112 }
114
115
120 public void writeExternal(ObjectOutput out) throws IOException {
121 out.writeUTF((this.prefix != null) ? this.prefix : "");
122 out.writeUTF(this.localName);
123 out.writeUTF(this.m.getDeclaringClass().getName());
124 out.writeUTF(this.m.getName());
125 out.writeObject(ReflectionUtil.toTypeNameArray(this.m.getParameterTypes()));
126 }
127
128
133 public void readExternal(ObjectInput in) throws IOException ,
134 ClassNotFoundException {
135
136 this.prefix = in.readUTF();
137 if ("".equals(this.prefix)) this.prefix = null;
138 this.localName = in.readUTF();
139 this.owner = in.readUTF();
140 this.name = in.readUTF();
141 this.types = (String []) in.readObject();
142 }
143
144 public Method getMethod() {
145 if (this.m == null) {
146 try {
147 Class t = Class.forName(this.owner);
148 Class [] p = ReflectionUtil.toTypeArray(this.types);
149 this.m = t.getMethod(this.name, p);
150 } catch (Exception e) {
151 e.printStackTrace();
152 }
153 }
154 return this.m;
155 }
156
157 public boolean matches(String prefix, String localName) {
158 if (this.prefix != null) {
159 if (prefix == null) return false;
160 if (!this.prefix.equals(prefix)) return false;
161 }
162 return this.localName.equals(localName);
163 }
164
165
168 public boolean equals(Object obj) {
169 if (obj instanceof Function) {
170 return this.hashCode() == obj.hashCode();
171 }
172 return false;
173 }
174
175
178 public int hashCode() {
179 return (this.prefix + this.localName).hashCode();
180 }
181 }
182
183 }
184 |
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