| /* CharViewBufferImpl.java -- |
| Copyright (C) 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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; |
| |
| class CharViewBufferImpl extends CharBuffer |
| { |
| /** Position in bb (i.e. a byte offset) where this buffer starts. */ |
| private int offset; |
| private ByteBuffer bb; |
| private boolean readOnly; |
| private ByteOrder endian; |
| |
| CharViewBufferImpl (ByteBuffer bb, int capacity) |
| { |
| super (capacity, capacity, 0, -1); |
| this.bb = bb; |
| this.offset = bb.position(); |
| this.readOnly = bb.isReadOnly(); |
| this.endian = bb.order(); |
| if (bb.isDirect()) |
| this.address = VMDirectByteBuffer.adjustAddress(bb.address, offset); |
| } |
| |
| public CharViewBufferImpl (ByteBuffer bb, int offset, int capacity, |
| int limit, int position, int mark, |
| boolean readOnly, ByteOrder endian) |
| { |
| super (capacity, limit, position, mark); |
| this.bb = bb; |
| this.offset = offset; |
| this.readOnly = readOnly; |
| this.endian = endian; |
| if (bb.isDirect()) |
| this.address = VMDirectByteBuffer.adjustAddress(bb.address, offset); |
| } |
| |
| /** |
| * 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 () |
| { |
| int p = position(); |
| char result = ByteBufferHelper.getChar(bb, (p << 1) + offset, endian); |
| position(p + 1); |
| return result; |
| } |
| |
| /** |
| * 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) |
| { |
| return ByteBufferHelper.getChar(bb, (index << 1) + offset, endian); |
| } |
| |
| public CharBuffer put (char value) |
| { |
| int p = position(); |
| ByteBufferHelper.putChar(bb, (p << 1) + offset, value, endian); |
| position(p + 1); |
| return this; |
| } |
| |
| public CharBuffer put (int index, char value) |
| { |
| ByteBufferHelper.putChar(bb, (index << 1) + offset, value, endian); |
| return this; |
| } |
| |
| public CharBuffer compact () |
| { |
| if (position () > 0) |
| { |
| int count = limit () - position (); |
| bb.shiftDown(offset, offset + 2 * position(), 2 * count); |
| position (count); |
| limit (capacity ()); |
| } |
| else |
| { |
| position(limit()); |
| limit(capacity()); |
| } |
| return this; |
| } |
| |
| public CharBuffer slice () |
| { |
| // Create a sliced copy of this object that shares its content. |
| return new CharViewBufferImpl (bb, (position () >> 1) + offset, |
| remaining (), remaining (), 0, -1, |
| isReadOnly (), endian); |
| } |
| |
| CharBuffer duplicate (boolean readOnly) |
| { |
| int pos = position(); |
| reset(); |
| int mark = position(); |
| position(pos); |
| return new CharViewBufferImpl (bb, offset, capacity(), limit(), |
| pos, mark, readOnly, endian); |
| } |
| |
| public CharBuffer duplicate () |
| { |
| return duplicate(readOnly); |
| } |
| |
| public CharBuffer asReadOnlyBuffer () |
| { |
| return duplicate(true); |
| } |
| |
| public CharSequence subSequence (int start, int end) |
| { |
| if (start < 0 |
| || end < start |
| || end > length ()) |
| throw new IndexOutOfBoundsException (); |
| |
| return new CharViewBufferImpl (bb, array_offset, capacity (), |
| position () + end, position () + start, |
| -1, isReadOnly (), endian); |
| } |
| |
| public boolean isReadOnly () |
| { |
| return readOnly; |
| } |
| |
| public boolean isDirect () |
| { |
| return bb.isDirect (); |
| } |
| |
| public ByteOrder order () |
| { |
| return endian; |
| } |
| } |