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/* * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.reflect; /** Assists in iterating down a method's signature */ public class SignatureIterator {    private String sig;    private int idx;     public SignatureIterator(String sig) {        this.sig = sig;        reset();    }     public void reset() {        idx = 1;    }     public boolean atEnd() {        return sig.charAt(idx) == ')';    }     public String next() {        if (atEnd()) return null;        char c = sig.charAt(idx);        if (c != '[' && c != 'L') {            ++idx;            return new String(new char[] { c });        }        // Walk forward to end of entry        int endIdx = idx;        if (c == '[') {            while ((c = sig.charAt(endIdx)) == '[') {                endIdx++;            }        }         if (c == 'L') {            while (sig.charAt(endIdx) != ';') {                endIdx++;            }        }         int beginIdx = idx;        idx = endIdx + 1;        return sig.substring(beginIdx, idx);    }     /** Should only be called when atEnd() is true. Does not change        state of iterator. */    public String returnType() {        if (!atEnd()) {            throw new InternalError("Illegal use of SignatureIterator");        }        return sig.substring(idx + 1, sig.length());    }}