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1
32
33 package com.jeantessier.classreader;
34
35 import java.util.*;
36
37 import org.apache.log4j.*;
38 import org.apache.oro.text.perl.*;
39
40 public final class SignatureHelper {
41 private static final Perl5Util perl = new Perl5Util();
42
43 private static Map conversion = new HashMap();
44
45 static {
46 conversion.put("B", "byte");
47 conversion.put("C", "char");
48 conversion.put("D", "double");
49 conversion.put("F", "float");
50 conversion.put("I", "int");
51 conversion.put("J", "long");
52 conversion.put("S", "short");
53 conversion.put("V", "void");
54 conversion.put("Z", "boolean");
55 }
56
57 static String  convert(String type) {
58 String result = null;
59
60 Logger.getLogger(SignatureHelper.class).debug("Begin Convert(\"" + type + "\")");
61
62 if (type.length() == 1) {
63 result = (String ) conversion.get(type);
64 } else if (type.charAt(0) == 'L') {
65 result = path2ClassName(type.substring(1, type.indexOf(';')));
66 } else if (type.charAt(0) == '[') {
67 result = convert(type.substring(1)) + "[]";
68 }
69
70 Logger.getLogger(SignatureHelper.class).debug("End Convert(\"" + type + "\"): \"" + result + "\"");
71
72 return result;
73 }
74
75 public static String path2ClassName(String path) {
76 return perl.substitute("s/\\//./g", path);
77 }
78
79 public static String getSignature(String descriptor) {
80 StringBuffer result = new StringBuffer ();
81
82 Logger.getLogger(SignatureHelper.class).debug("Begin Signature(\"" + descriptor + "\")");
83
84 result.append("(");
85
86 int start = descriptor.indexOf("(") + 1;
87 int end = descriptor.indexOf(")");
88
89 SignatureIterator i = new SignatureIterator(descriptor.substring(start, end));
90 while (i.hasNext()) {
91 result.append(i.next());
92 if (i.hasNext()) {
93 result.append(", ");
94 }
95 }
96
97 result.append(")");
98
99 Logger.getLogger(SignatureHelper.class).debug("End Signature(\"" + descriptor + "\"): \"" + result + "\"");
100
101 return result.toString();
102 }
103
104 public static int getParameterCount(String descriptor) {
105 int result = 0;
106
107 Logger.getLogger(SignatureHelper.class).debug("Begin ParameterCount(\"" + descriptor + "\")");
108
109 int start = descriptor.indexOf("(") + 1;
110 int end = descriptor.indexOf(")");
111
112 SignatureIterator i = new SignatureIterator(descriptor.substring(start, end));
113 while (i.hasNext()) {
114 i.next();
115 result++;
116 }
117
118 Logger.getLogger(SignatureHelper.class).debug("End ParameterCount(\"" + descriptor + "\"): \"" + result + "\"");
119
120 return result;
121 }
122
123 public static String getReturnType(String descriptor) {
124 return convert(descriptor.substring(descriptor.lastIndexOf(")") + 1));
125 }
126
127 public static String getType(String descriptor) {
128 return convert(descriptor);
129 }
130 }
131
132 class SignatureIterator implements Iterator {
133 private String descriptor;
134 private int currentPos = 0;
135
136 public SignatureIterator(String descriptor) {
137 this.descriptor = descriptor;
138 }
139
140 public boolean hasNext() {
141 return currentPos < descriptor.length();
142 }
143
144 public Object next() {
145 String result;
146
147 if (hasNext()) {
148 int nextPos = currentPos;
149
150 while (descriptor.charAt(nextPos) == '[') {
151 nextPos++;
152 }
153
154 if (descriptor.charAt(nextPos) == 'L') {
155 nextPos = descriptor.indexOf(";", nextPos);
156 }
157
158 result = SignatureHelper.convert(descriptor.substring(currentPos, nextPos + 1));
159
160 currentPos = nextPos + 1;
161 } else {
162 throw new NoSuchElementException();
163 }
164
165 return result;
166 }
167
168 public void remove() {
169 throw new UnsupportedOperationException ();
170 }
171 }
172 |
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