01: /*
02: * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.reflect;
27:
28: /** Assists in iterating down a method's signature */
29:
30: public class SignatureIterator {
31: private String sig;
32: private int idx;
33:
34: public SignatureIterator(String sig) {
35: this .sig = sig;
36: reset();
37: }
38:
39: public void reset() {
40: idx = 1;
41: }
42:
43: public boolean atEnd() {
44: return sig.charAt(idx) == ')';
45: }
46:
47: public String next() {
48: if (atEnd())
49: return null;
50: char c = sig.charAt(idx);
51: if (c != '[' && c != 'L') {
52: ++idx;
53: return new String(new char[] { c });
54: }
55: // Walk forward to end of entry
56: int endIdx = idx;
57: if (c == '[') {
58: while ((c = sig.charAt(endIdx)) == '[') {
59: endIdx++;
60: }
61: }
62:
63: if (c == 'L') {
64: while (sig.charAt(endIdx) != ';') {
65: endIdx++;
66: }
67: }
68:
69: int beginIdx = idx;
70: idx = endIdx + 1;
71: return sig.substring(beginIdx, idx);
72: }
73:
74: /** Should only be called when atEnd() is true. Does not change
75: state of iterator. */
76: public String returnType() {
77: if (!atEnd()) {
78: throw new InternalError("Illegal use of SignatureIterator");
79: }
80: return sig.substring(idx + 1, sig.length());
81: }
82: }
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