/*

 * Copyright (c) 2005, 2020, 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) 1996-2009, International Business Machines Corporation and    *

 * others. All Rights Reserved.                                                *

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

 */

package jdk.internal.icu.text;

/**

 * <code>ReplaceableString</code> is an adapter class that implements the

 * <code>Replaceable</code> API around an ordinary <code>StringBuffer</code>.

 *

 * <p><em>Note:</em> This class does not support attributes and is not

 * intended for general use.  Most clients will need to implement

 * {@link Replaceable} in their text representation class.

 *

 * <p>Copyright &copy; IBM Corporation 1999.  All rights reserved.

 *

 * @see Replaceable

 * @author Alan Liu

 * @stable ICU 2.0

 */

public class ReplaceableString implements Replaceable {

    private StringBuffer buf;

    /**

     * Construct a new object with the given initial contents.

     * @param str initial contents

     * @stable ICU 2.0

     */

    public ReplaceableString(String str) {

        buf = new StringBuffer(str);

    }

    /**

     * Construct a new object using <code>buf</code> for internal

     * storage.  The contents of <code>buf</code> at the time of

     * construction are used as the initial contents.  <em>Note!

     * Modifications to <code>buf</code> will modify this object, and

     * vice versa.</em>

     * @param buf object to be used as internal storage

     * @stable ICU 2.0

     */

    public ReplaceableString(StringBuffer buf) {

        this.buf = buf;

    }

    /**

     * Return the number of characters contained in this object.

     * <code>Replaceable</code> API.

     * @stable ICU 2.0

     */

    public int length() {

        return buf.length();

    }

    /**

     * Return the character at the given position in this object.

     * <code>Replaceable</code> API.

     * @param offset offset into the contents, from 0 to

     * <code>length()</code> - 1

     * @stable ICU 2.0

     */

    public char charAt(int offset) {

        return buf.charAt(offset);

    }

    /**

     * Copies characters from this object into the destination

     * character array.  The first character to be copied is at index

     * <code>srcStart</code>; the last character to be copied is at

     * index <code>srcLimit-1</code> (thus the total number of

     * characters to be copied is <code>srcLimit-srcStart</code>). The

     * characters are copied into the subarray of <code>dst</code>

     * starting at index <code>dstStart</code> and ending at index

     * <code>dstStart + (srcLimit-srcStart) - 1</code>.

     *

     * @param srcStart the beginning index to copy, inclusive;

     *        {@code 0 <= start <= limit}.

     * @param srcLimit the ending index to copy, exclusive;

     *        {@code start <= limit <= length()}.

     * @param dst the destination array.

     * @param dstStart the start offset in the destination array.

     * @stable ICU 2.0

     */

    public void getChars(int srcStart, int srcLimit, char dst[], int dstStart) {

        if (srcStart != srcLimit) {

            buf.getChars(srcStart, srcLimit, dst, dstStart);

        }

    }

}