/*

 * Copyright 2000-2005 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 java.nio;

// ## If the sequence is a string, use reflection to share its array

class StringCharBuffer                                  // package-private

    extends CharBuffer

{

    CharSequence str;

    StringCharBuffer(CharSequence s, int start, int end) { // package-private

        super(-1, start, end, s.length());

        int n = s.length();

        if ((start < 0) || (start > n) || (end < start) || (end > n))

            throw new IndexOutOfBoundsException();

        str = s;

    }

    public CharBuffer slice() {

        return new StringCharBuffer(str,

                                    -1,

                                    0,

                                    this.remaining(),

                                    this.remaining(),

                                    this.position());

    }

    private StringCharBuffer(CharSequence s,

                             int mark,

                             int pos,

                             int limit,

                             int cap,

                             int offset) {

        super(mark, pos, limit, cap, null, offset);

        str = s;

    }

    private StringCharBuffer(CharSequence s, int mark,

                             int pos, int limit, int cap)

    {

        super(mark, pos, limit, cap);

        str = s;

    }

    public CharBuffer duplicate() {

        return new StringCharBuffer(str, markValue(),

                                    position(), limit(), capacity());

    }

    public CharBuffer asReadOnlyBuffer() {

        return duplicate();

    }

    public final char get() {

        return str.charAt(nextGetIndex());

    }

    public final char get(int index) {

        return str.charAt(checkIndex(index));

    }

    // ## Override bulk get methods for better performance

    public final CharBuffer put(char c) {

        throw new ReadOnlyBufferException();

    }

    public final CharBuffer put(int index, char c) {

        throw new ReadOnlyBufferException();

    }

    public final CharBuffer compact() {

        throw new ReadOnlyBufferException();

    }

    public final boolean isReadOnly() {

        return true;

    }

    final String toString(int start, int end) {

        return str.toString().substring(start, end);

    }

    public final CharSequence subSequence(int start, int end) {

        try {

            int pos = position();

            return new StringCharBuffer(str,

                                        pos + checkIndex(start, pos),

                                        pos + checkIndex(end, pos));

        } catch (IllegalArgumentException x) {

            throw new IndexOutOfBoundsException();

        }

    }

    public boolean isDirect() {

        return false;

    }

    public ByteOrder order() {

        return ByteOrder.nativeOrder();

    }

}