/*

 * Copyright 2001 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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());

    }

}