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/* CharBufferImpl.java --

   Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.nio;

/**

 * This is a Heap memory implementation

 */

final class CharBufferImpl extends CharBuffer

{

  private boolean readOnly;

  CharBufferImpl (int capacity)

  {

    this (new char [capacity], 0, capacity, capacity, 0, -1, false);

  }

  CharBufferImpl (char[] buffer, int offset, int capacity, int limit, int position, int mark, boolean readOnly)

  {

    super (capacity, limit, position, mark);

    this.backing_buffer = buffer;

    this.array_offset = offset;

    this.readOnly = readOnly;

  }

  public CharBufferImpl (CharBufferImpl copy)

  {

    super (copy.capacity (), copy.limit (), copy.position (), 0);

    backing_buffer = copy.backing_buffer;

    array_offset = copy.array_offset;

    readOnly = copy.isReadOnly ();

  }

  public boolean isReadOnly ()

  {

    return readOnly;

  }

  public CharBuffer slice ()

  {

    return new CharBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ());

  }

  public CharBuffer duplicate ()

  {

    return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ());

  }

  public CharBuffer asReadOnlyBuffer ()

  {

    return new CharBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true);

  }

  public CharBuffer compact ()

  {

    checkIfReadOnly();

    mark = -1;

    int copied = 0;

    while (remaining () > 0)

      {

        put (copied, get ());

        copied++;

      }

    position (copied);

    limit(capacity());

    return this;

  }

  public boolean isDirect ()

  {

    return false;

  }

  public CharSequence subSequence (int start, int end)

  {

    if (start < 0

        || start > length ()

        || end < start

        || end > length ())

      throw new IndexOutOfBoundsException ();

    return new CharBufferImpl (backing_buffer, array_offset, capacity (), position () + end, position () + start, -1, isReadOnly ());

  }

  /**

   * Reads the <code>char</code> at this buffer's current position,

   * and then increments the position.

   *

   * @exception BufferUnderflowException If there are no remaining

   * <code>char</code>s in this buffer.

   */

  public char get ()

  {

    if (pos >= limit)

        throw new BufferUnderflowException();

    return backing_buffer [(pos++) + array_offset];

  }

  /**

   * Relative put method. Writes <code>value</code> to the next position

   * in the buffer.

   *

   * @exception ReadOnlyBufferException If this buffer is read-only.

   */

  public CharBuffer put (char value)

  {

    if (readOnly)

        throw new ReadOnlyBufferException();

    if (pos >= limit)

        throw new BufferOverflowException();

    backing_buffer [(pos++) + array_offset] = value;

    return this;

  }

  /**

   * Absolute get method. Reads the <code>char</code> at position

   * <code>index</code>.

   *

   * @param index Position to read the <code>char</code> from.

   *

   * @exception IndexOutOfBoundsException If index is negative or not smaller

   * than the buffer's limit.

   */

  public char get (int index)

  {

    checkIndex(index);

    return backing_buffer [index + array_offset];

  }

  /**

   * Bulk get, overloaded for speed.

   */

  public CharBuffer get (char[] dst, int offset, int length)

  {

    checkArraySize(dst.length, offset, length);

    checkForUnderflow(length);

    System.arraycopy(backing_buffer, pos + array_offset,

                     dst, offset, length);

    pos += length;

    return this;

  }

  /**

   * Bulk put, overloaded for speed.

   */

  public CharBuffer put (char[] src, int offset, int length)

  {

    checkArraySize(src.length, offset, length);

    checkForOverflow(length);

    System.arraycopy(src, offset,

                     backing_buffer, pos + array_offset, length);

    pos += length;

    return this;

  }

  /**

   * Absolute put method. Writes <code>value</code> to position

   * <code>index</code> in the buffer.

   *

   * @exception IndexOutOfBoundsException If index is negative or not smaller

   * than the buffer's limit.

   * @exception ReadOnlyBufferException If this buffer is read-only.

   */

  public CharBuffer put (int index, char value)

  {

    checkIndex(index);

    checkIfReadOnly();

    backing_buffer [index + array_offset] = value;

    return this;

  }

  public ByteOrder order ()

  {

    return ByteOrder.nativeOrder ();

  }

}