| /* ByteBufferImpl.java -- |
| Copyright (C) 2002, 2003, 2004, 2005 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 ByteBufferImpl extends ByteBuffer |
| { |
| private boolean readOnly; |
| |
| ByteBufferImpl (byte[] 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 CharBuffer asCharBuffer () |
| { |
| return new CharViewBufferImpl (this, remaining() >> 1); |
| } |
| |
| public ShortBuffer asShortBuffer () |
| { |
| return new ShortViewBufferImpl (this, remaining() >> 1); |
| } |
| |
| public IntBuffer asIntBuffer () |
| { |
| return new IntViewBufferImpl (this, remaining() >> 2); |
| } |
| |
| public LongBuffer asLongBuffer () |
| { |
| return new LongViewBufferImpl (this, remaining() >> 3); |
| } |
| |
| public FloatBuffer asFloatBuffer () |
| { |
| return new FloatViewBufferImpl (this, remaining() >> 2); |
| } |
| |
| public DoubleBuffer asDoubleBuffer () |
| { |
| return new DoubleViewBufferImpl (this, remaining() >> 3); |
| } |
| |
| public boolean isReadOnly () |
| { |
| return readOnly; |
| } |
| |
| public ByteBuffer slice () |
| { |
| return new ByteBufferImpl (backing_buffer, array_offset + position (), remaining (), remaining (), 0, -1, isReadOnly ()); |
| } |
| |
| public ByteBuffer duplicate () |
| { |
| return new ByteBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, isReadOnly ()); |
| } |
| |
| public ByteBuffer asReadOnlyBuffer () |
| { |
| return new ByteBufferImpl (backing_buffer, array_offset, capacity (), limit (), position (), mark, true); |
| } |
| |
| void shiftDown (int dst_offset, int src_offset, int count) |
| { |
| System.arraycopy(backing_buffer, array_offset + src_offset, |
| backing_buffer, array_offset + dst_offset, |
| count); |
| } |
| |
| public ByteBuffer compact () |
| { |
| checkIfReadOnly(); |
| mark = -1; |
| int pos = position(); |
| int n = limit() - pos; |
| if (n > 0) |
| shiftDown(0, pos, n); |
| position(n); |
| limit(capacity()); |
| return this; |
| } |
| |
| public boolean isDirect () |
| { |
| return false; |
| } |
| |
| /** |
| * Reads the <code>byte</code> at this buffer's current position, |
| * and then increments the position. |
| * |
| * @exception BufferUnderflowException If there are no remaining |
| * <code>bytes</code> in this buffer. |
| */ |
| public byte get () |
| { |
| if (pos >= limit) |
| throw new BufferUnderflowException(); |
| |
| return backing_buffer [(pos++) + array_offset]; |
| } |
| |
| /** |
| * Bulk get |
| */ |
| public ByteBuffer get (byte[] dst, int offset, int length) |
| { |
| checkArraySize(dst.length, offset, length); |
| if ( (limit - pos) < length) // check for overflow |
| throw new BufferUnderflowException(); |
| |
| System.arraycopy(backing_buffer, pos + array_offset, |
| dst, offset, length); |
| pos += length; |
| |
| return this; |
| } |
| |
| /** |
| * Relative bulk put(), overloads the ByteBuffer impl. |
| */ |
| public ByteBuffer put (byte[] src, int offset, int length) |
| { |
| if ( (limit - pos) < length) // check for overflow |
| throw new BufferOverflowException(); |
| checkArraySize(src.length, offset, length); |
| |
| System.arraycopy(src, offset, backing_buffer, pos + array_offset, length); |
| pos += length; |
| |
| return this; |
| } |
| |
| /** |
| * Relative put method. Writes <code>value</code> to the next position |
| * in the buffer. |
| * |
| * @exception BufferOverflowException If there is no remaining |
| * space in this buffer. |
| * @exception ReadOnlyBufferException If this buffer is read-only. |
| */ |
| public ByteBuffer put (byte 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>byte</code> at position |
| * <code>index</code>. |
| * |
| * @exception IndexOutOfBoundsException If index is negative or not smaller |
| * than the buffer's limit. |
| */ |
| public byte get (int index) |
| { |
| checkIndex(index); |
| |
| return backing_buffer [index + array_offset]; |
| } |
| |
| /** |
| * 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 ByteBuffer put (int index, byte value) |
| { |
| checkIfReadOnly(); |
| checkIndex(index); |
| |
| backing_buffer [index + array_offset] = value; |
| return this; |
| } |
| |
| public char getChar () |
| { |
| return ByteBufferHelper.getChar(this, order()); |
| } |
| |
| public ByteBuffer putChar (char value) |
| { |
| if (readOnly) |
| throw new ReadOnlyBufferException (); |
| if ( (limit-pos) < 2) |
| throw new BufferOverflowException(); |
| |
| if (endian == ByteOrder.LITTLE_ENDIAN) |
| { |
| backing_buffer [(pos++) + array_offset] = (byte)(value&0xFF); |
| backing_buffer [(pos++) + array_offset] = (byte)(value>>8); |
| } |
| else |
| { |
| backing_buffer [(pos++) + array_offset] = (byte)(value>>8); |
| backing_buffer [(pos++) + array_offset] = (byte)(value&0xFF); |
| } |
| return this; |
| } |
| |
| public char getChar (int index) |
| { |
| return ByteBufferHelper.getChar(this, index, order()); |
| } |
| |
| public ByteBuffer putChar (int index, char value) |
| { |
| ByteBufferHelper.putChar(this, index, value, order()); |
| return this; |
| } |
| |
| public short getShort () |
| { |
| return ByteBufferHelper.getShort(this, order()); |
| } |
| |
| public ByteBuffer putShort (short value) |
| { |
| ByteBufferHelper.putShort(this, value, order()); |
| return this; |
| } |
| |
| public short getShort (int index) |
| { |
| return ByteBufferHelper.getShort(this, index, order()); |
| } |
| |
| public ByteBuffer putShort (int index, short value) |
| { |
| ByteBufferHelper.putShort(this, index, value, order()); |
| return this; |
| } |
| |
| public int getInt () |
| { |
| return ByteBufferHelper.getInt(this, order()); |
| } |
| |
| public ByteBuffer putInt (int value) |
| { |
| ByteBufferHelper.putInt(this, value, order()); |
| return this; |
| } |
| |
| public int getInt (int index) |
| { |
| return ByteBufferHelper.getInt(this, index, order()); |
| } |
| |
| public ByteBuffer putInt (int index, int value) |
| { |
| ByteBufferHelper.putInt(this, index, value, order()); |
| return this; |
| } |
| |
| public long getLong () |
| { |
| return ByteBufferHelper.getLong(this, order()); |
| } |
| |
| public ByteBuffer putLong (long value) |
| { |
| ByteBufferHelper.putLong (this, value, order()); |
| return this; |
| } |
| |
| public long getLong (int index) |
| { |
| return ByteBufferHelper.getLong (this, index, order()); |
| } |
| |
| public ByteBuffer putLong (int index, long value) |
| { |
| ByteBufferHelper.putLong (this, index, value, order()); |
| return this; |
| } |
| |
| public float getFloat () |
| { |
| return ByteBufferHelper.getFloat (this, order()); |
| } |
| |
| public ByteBuffer putFloat (float value) |
| { |
| ByteBufferHelper.putFloat (this, value, order()); |
| return this; |
| } |
| |
| public float getFloat (int index) |
| { |
| return ByteBufferHelper.getFloat (this, index, order()); |
| } |
| |
| public ByteBuffer putFloat (int index, float value) |
| { |
| ByteBufferHelper.putFloat (this, index, value, order()); |
| return this; |
| } |
| |
| public double getDouble () |
| { |
| return ByteBufferHelper.getDouble (this, order()); |
| } |
| |
| public ByteBuffer putDouble (double value) |
| { |
| ByteBufferHelper.putDouble (this, value, order()); |
| return this; |
| } |
| |
| public double getDouble (int index) |
| { |
| return ByteBufferHelper.getDouble (this, index, order()); |
| } |
| |
| public ByteBuffer putDouble (int index, double value) |
| { |
| ByteBufferHelper.putDouble (this, index, value, order()); |
| return this; |
| } |
| } |