KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > tc > asm > commons > Method


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package com.tc.asm.commons;
31
32 import java.util.HashMap JavaDoc;
33 import java.util.Map JavaDoc;
34
35 import com.tc.asm.Type;
36
37 /**
38  * A named method descriptor.
39  *
40  * @author Juozas Baliuka
41  * @author Chris Nokleberg
42  * @author Eric Bruneton
43  */
44 public class Method {
45
46     /**
47      * The method name.
48      */
49     private final String JavaDoc name;
50
51     /**
52      * The method descriptor.
53      */
54     private final String JavaDoc desc;
55
56     /**
57      * Maps primitive Java type names to their descriptors.
58      */
59     private final static Map JavaDoc DESCRIPTORS;
60
61     static {
62         DESCRIPTORS = new HashMap JavaDoc();
63         DESCRIPTORS.put("void", "V");
64         DESCRIPTORS.put("byte", "B");
65         DESCRIPTORS.put("char", "C");
66         DESCRIPTORS.put("double", "D");
67         DESCRIPTORS.put("float", "F");
68         DESCRIPTORS.put("int", "I");
69         DESCRIPTORS.put("long", "J");
70         DESCRIPTORS.put("short", "S");
71         DESCRIPTORS.put("boolean", "Z");
72     }
73
74     /**
75      * Creates a new {@link Method}.
76      *
77      * @param name the method's name.
78      * @param desc the method's descriptor.
79      */
80     public Method(final String JavaDoc name, final String JavaDoc desc) {
81         this.name = name;
82         this.desc = desc;
83     }
84
85     /**
86      * Creates a new {@link Method}.
87      *
88      * @param name the method's name.
89      * @param returnType the method's return type.
90      * @param argumentTypes the method's argument types.
91      */
92     public Method(
93         final String JavaDoc name,
94         final Type returnType,
95         final Type[] argumentTypes)
96     {
97         this(name, Type.getMethodDescriptor(returnType, argumentTypes));
98     }
99
100     /**
101      * Returns a {@link Method} corresponding to the given Java method
102      * declaration.
103      *
104      * @param method a Java method declaration, without argument names, of the
105      * form "returnType name (argumentType1, ... argumentTypeN)", where
106      * the types are in plain Java (e.g. "int", "float",
107      * "java.util.List", ...).
108      * @return a {@link Method} corresponding to the given Java method
109      * declaration.
110      * @throws IllegalArgumentException if <code>method</code> could not get
111      * parsed.
112      */
113     public static Method getMethod(final String JavaDoc method)
114             throws IllegalArgumentException JavaDoc
115     {
116         int space = method.indexOf(' ');
117         int start = method.indexOf('(', space) + 1;
118         int end = method.indexOf(')', start);
119         if (space == -1 || start == -1 || end == -1) {
120             throw new IllegalArgumentException JavaDoc();
121         }
122         // TODO: Check validity of returnType, methodName and arguments.
123 String JavaDoc returnType = method.substring(0, space);
124         String JavaDoc methodName = method.substring(space + 1, start - 1).trim();
125         StringBuffer JavaDoc sb = new StringBuffer JavaDoc();
126         sb.append('(');
127         int p;
128         do {
129             p = method.indexOf(',', start);
130             if (p == -1) {
131                 sb.append(map(method.substring(start, end).trim()));
132             } else {
133                 sb.append(map(method.substring(start, p).trim()));
134                 start = p + 1;
135             }
136         } while (p != -1);
137         sb.append(')');
138         sb.append(map(returnType));
139         return new Method(methodName, sb.toString());
140     }
141
142     private static String JavaDoc map(final String JavaDoc type) {
143         if (type.equals("")) {
144             return type;
145         }
146
147         StringBuffer JavaDoc sb = new StringBuffer JavaDoc();
148         int index = 0;
149         while ((index = type.indexOf("[]", index) + 1) > 0) {
150             sb.append('[');
151         }
152
153         String JavaDoc t = type.substring(0, type.length() - sb.length() * 2);
154         String JavaDoc desc = (String JavaDoc) DESCRIPTORS.get(t);
155         if (desc != null) {
156             sb.append(desc);
157         } else {
158             sb.append('L');
159             if (t.indexOf('.') < 0) {
160                 sb.append("java/lang/" + t);
161             } else {
162                 sb.append(t.replace('.', '/'));
163             }
164             sb.append(';');
165         }
166         return sb.toString();
167     }
168
169     /**
170      * Returns the name of the method described by this object.
171      *
172      * @return the name of the method described by this object.
173      */
174     public String JavaDoc getName() {
175         return name;
176     }
177
178     /**
179      * Returns the descriptor of the method described by this object.
180      *
181      * @return the descriptor of the method described by this object.
182      */
183     public String JavaDoc getDescriptor() {
184         return desc;
185     }
186
187     /**
188      * Returns the return type of the method described by this object.
189      *
190      * @return the return type of the method described by this object.
191      */
192     public Type getReturnType() {
193         return Type.getReturnType(desc);
194     }
195
196     /**
197      * Returns the argument types of the method described by this object.
198      *
199      * @return the argument types of the method described by this object.
200      */
201     public Type[] getArgumentTypes() {
202         return Type.getArgumentTypes(desc);
203     }
204
205     public String JavaDoc toString() {
206         return name + desc;
207     }
208
209     public boolean equals(final Object JavaDoc o) {
210         if (!(o instanceof Method)) {
211             return false;
212         }
213         Method other = (Method) o;
214         return name.equals(other.name) && desc.equals(other.desc);
215     }
216
217     public int hashCode() {
218         return name.hashCode() ^ desc.hashCode();
219     }
220 }
Popular Tags