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1
52
53 package com.go.trove.classfile;
54
55 import java.util.List  ;
56 import java.util.ArrayList ;
57
58
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
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
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 }
204 |
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