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comparison src/com/go/trove/classfile/MethodDescriptor.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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-1:000000000000 0:3dc0c5604566
1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.classfile;
54
55 import java.util.List;
56 import java.util.ArrayList;
57
58 /******************************************************************************
59 * This class is used to build method descriptor strings as
60 * defined in <i>The Java Virtual Machine Specification</i>, section 4.3.3.
61 *
62 * @author Brian S O'Neill
63 * @version
64 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
65 */
66 public class MethodDescriptor extends Descriptor {
67 private static TypeDescriptor[] cEmptyParams = new TypeDescriptor[0];
68
69 private String mStr;
70 private TypeDescriptor mRetType;
71 private TypeDescriptor[] mParams;
72
73 public MethodDescriptor() {
74 this(null, null);
75 }
76
77 /**
78 * Used to construct a method descriptor for a method with a return
79 * type and parameters.
80 */
81 public MethodDescriptor(TypeDescriptor ret, TypeDescriptor[] params) {
82 if (params == null) {
83 params = cEmptyParams;
84 }
85
86 mStr = generate(ret, params);
87 mRetType = ret;
88 mParams = params;
89 }
90
91 public TypeDescriptor getReturnType() {
92 return mRetType;
93 }
94
95 public int getParameterCount() {
96 return mParams.length;
97 }
98
99 public TypeDescriptor[] getParameterTypes() {
100 return mParams;
101 }
102
103 public String toString() {
104 return mStr;
105 }
106
107 public static String generate() {
108 return generate(null, null);
109 }
110
111 /**
112 * Used to generate a method descriptor for a method with a return
113 * type and parameters.
114 */
115 public static String generate(TypeDescriptor ret,
116 TypeDescriptor[] params) {
117
118 StringBuffer desc = new StringBuffer(20);
119
120 desc.append('(');
121
122 if (params != null) {
123 for (int i=0; i<params.length; i++) {
124 desc.append(params[i]);
125 }
126 }
127
128 desc.append(')');
129
130 if (ret == null) ret = new TypeDescriptor(Void.TYPE);
131 desc.append(ret);
132
133 return desc.toString();
134 }
135
136 public static MethodDescriptor parseMethodDesc(String desc)
137 throws IllegalArgumentException {
138
139 MethodDescriptor md;
140 int cursor = 0;
141 try {
142 char c;
143
144 if ((c = desc.charAt(cursor++)) != '(') {
145 throw new IllegalArgumentException
146 ("Invalid descriptor: " + desc);
147 }
148
149 StringBuffer buf = new StringBuffer();
150 List list = new ArrayList();
151
152 while ((c = desc.charAt(cursor++)) != ')') {
153 switch (c) {
154 case 'V':
155 case 'I':
156 case 'C':
157 case 'Z':
158 case 'D':
159 case 'F':
160 case 'J':
161 case 'B':
162 case 'S':
163 buf.append(c);
164 break;
165 case '[':
166 buf.append(c);
167 continue;
168 case 'L':
169 while (true) {
170 buf.append(c);
171 if (c == ';') {
172 break;
173 }
174 c = desc.charAt(cursor++);
175 }
176 break;
177 default:
178 throw new IllegalArgumentException
179 ("Invalid descriptor: " + desc);
180 }
181
182 list.add(TypeDescriptor.parseTypeDesc(buf.toString()));
183 buf.setLength(0);
184 }
185
186 TypeDescriptor ret =
187 TypeDescriptor.parseTypeDesc(desc.substring(cursor));
188
189 TypeDescriptor[] tds = new TypeDescriptor[list.size()];
190 tds = (TypeDescriptor[])list.toArray(tds);
191
192 md = new MethodDescriptor(ret, tds);
193 }
194 catch (NullPointerException e) {
195 throw new IllegalArgumentException("Invalid descriptor: " + desc);
196 }
197 catch (IndexOutOfBoundsException e) {
198 throw new IllegalArgumentException("Invalid descriptor: " + desc);
199 }
200
201 return md;
202 }
203 }