1/*
2 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.internal.reflect;
27
28/** Assists in iterating down a method's signature */
29
30class SignatureIterator {
31    private final 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()) return null;
49        char c = sig.charAt(idx);
50        if (c != '[' && c != 'L') {
51            ++idx;
52            return new String(new char[] { c });
53        }
54        // Walk forward to end of entry
55        int endIdx = idx;
56        if (c == '[') {
57            while ((c = sig.charAt(endIdx)) == '[') {
58                endIdx++;
59            }
60        }
61
62        if (c == 'L') {
63            while (sig.charAt(endIdx) != ';') {
64                endIdx++;
65            }
66        }
67
68        int beginIdx = idx;
69        idx = endIdx + 1;
70        return sig.substring(beginIdx, idx);
71    }
72
73    /** Should only be called when atEnd() is true. Does not change
74        state of iterator. */
75    public String returnType() {
76        if (!atEnd()) {
77            throw new InternalError("Illegal use of SignatureIterator");
78        }
79        return sig.substring(idx + 1, sig.length());
80    }
81}
82