/*

 * Copyright (c) 2010, 2011, 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.

 */

/*

 *******************************************************************************

 * Copyright (C) 2009, International Business Machines Corporation and         *

 * others. All Rights Reserved.                                                *

 *******************************************************************************

 */

package sun.util.locale;

public class StringTokenIterator {

    private String text;

    private String dlms;        // null if a single char delimiter

    private char delimiterChar; // delimiter if a single char delimiter

    private String token;

    private int start;

    private int end;

    private boolean done;

    public StringTokenIterator(String text, String dlms) {

        this.text = text;

        if (dlms.length() == 1) {

            delimiterChar = dlms.charAt(0);

        } else {

            this.dlms = dlms;

        }

        setStart(0);

    }

    public String first() {

        setStart(0);

        return token;

    }

    public String current() {

        return token;

    }

    public int currentStart() {

        return start;

    }

    public int currentEnd() {

        return end;

    }

    public boolean isDone() {

        return done;

    }

    public String next() {

        if (hasNext()) {

            start = end + 1;

            end = nextDelimiter(start);

            token = text.substring(start, end);

        } else {

            start = end;

            token = null;

            done = true;

        }

        return token;

    }

    public boolean hasNext() {

        return (end < text.length());

    }

    public StringTokenIterator setStart(int offset) {

        if (offset > text.length()) {

            throw new IndexOutOfBoundsException();

        }

        start = offset;

        end = nextDelimiter(start);

        token = text.substring(start, end);

        done = false;

        return this;

    }

    public StringTokenIterator setText(String text) {

        this.text = text;

        setStart(0);

        return this;

    }

    private int nextDelimiter(int start) {

        int textlen = this.text.length();

        if (dlms == null) {

            for (int idx = start; idx < textlen; idx++) {

                if (text.charAt(idx) == delimiterChar) {

                    return idx;

                }

            }

        } else {

            int dlmslen = dlms.length();

            for (int idx = start; idx < textlen; idx++) {

                char c = text.charAt(idx);

                for (int i = 0; i < dlmslen; i++) {

                    if (c == dlms.charAt(i)) {

                        return idx;

                    }

                }

            }

        }

        return textlen;

    }

}