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 

    26 package sun.reflect;

    27 

    28 /** Assists in iterating down a method's signature */

    29 

    30 public class 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 }