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375 lines
9.3 KiB
Java
375 lines
9.3 KiB
Java
/* ByteBufferImpl.java --
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Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio;
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/**
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* This is a Heap memory implementation
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*/
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final class ByteBufferImpl extends ByteBuffer
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{
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private final boolean readOnly;
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ByteBufferImpl (byte[] buffer, int offset, int capacity, int limit,
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int position, int mark, boolean readOnly)
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{
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super (capacity, limit, position, mark, null, buffer, offset);
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this.readOnly = readOnly;
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}
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public CharBuffer asCharBuffer ()
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{
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return new CharViewBufferImpl (this, remaining() >> 1);
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}
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public ShortBuffer asShortBuffer ()
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{
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return new ShortViewBufferImpl (this, remaining() >> 1);
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}
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public IntBuffer asIntBuffer ()
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{
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return new IntViewBufferImpl (this, remaining() >> 2);
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}
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public LongBuffer asLongBuffer ()
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{
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return new LongViewBufferImpl (this, remaining() >> 3);
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}
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public FloatBuffer asFloatBuffer ()
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{
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return new FloatViewBufferImpl (this, remaining() >> 2);
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}
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public DoubleBuffer asDoubleBuffer ()
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{
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return new DoubleViewBufferImpl (this, remaining() >> 3);
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}
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public boolean isReadOnly ()
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{
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return readOnly;
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}
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public ByteBuffer slice ()
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{
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return new ByteBufferImpl (backing_buffer, array_offset + position (),
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remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public ByteBuffer duplicate ()
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{
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return new ByteBufferImpl (backing_buffer, array_offset, capacity (),
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limit (), position (), mark, isReadOnly ());
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}
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public ByteBuffer asReadOnlyBuffer ()
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{
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return new ByteBufferImpl (backing_buffer, array_offset, capacity (),
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limit (), position (), mark, true);
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}
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void shiftDown (int dst_offset, int src_offset, int count)
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{
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System.arraycopy(backing_buffer, array_offset + src_offset,
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backing_buffer, array_offset + dst_offset,
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count);
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}
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public ByteBuffer compact ()
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{
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checkIfReadOnly();
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mark = -1;
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int pos = position();
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int n = limit() - pos;
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if (n > 0)
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shiftDown(0, pos, n);
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position(n);
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limit(capacity());
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return this;
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}
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public boolean isDirect ()
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{
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return false;
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}
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/**
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* Reads the <code>byte</code> at this buffer's current position,
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* and then increments the position.
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*
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* @exception BufferUnderflowException If there are no remaining
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* <code>bytes</code> in this buffer.
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*/
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public byte get ()
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{
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if (pos >= limit)
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throw new BufferUnderflowException();
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return backing_buffer [(pos++) + array_offset];
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}
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/**
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* Bulk get
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*/
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public ByteBuffer get (byte[] dst, int offset, int length)
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{
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checkArraySize(dst.length, offset, length);
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if ( (limit - pos) < length) // check for overflow
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throw new BufferUnderflowException();
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System.arraycopy(backing_buffer, pos + array_offset,
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dst, offset, length);
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pos += length;
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return this;
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}
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/**
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* Relative bulk put(), overloads the ByteBuffer impl.
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*/
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public ByteBuffer put (byte[] src, int offset, int length)
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{
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if ( (limit - pos) < length) // check for overflow
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throw new BufferOverflowException();
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checkArraySize(src.length, offset, length);
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System.arraycopy(src, offset, backing_buffer, pos + array_offset, length);
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pos += length;
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return this;
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}
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/**
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* Relative put method. Writes <code>value</code> to the next position
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* in the buffer.
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*
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* @exception BufferOverflowException If there is no remaining
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* space in this buffer.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public ByteBuffer put (byte value)
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{
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if (readOnly)
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throw new ReadOnlyBufferException();
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if (pos >= limit)
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throw new BufferOverflowException();
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backing_buffer [(pos++) + array_offset] = value;
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return this;
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}
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/**
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* Absolute get method. Reads the <code>byte</code> at position
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* <code>index</code>.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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*/
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public byte get (int index)
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{
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checkIndex(index);
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return backing_buffer [index + array_offset];
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}
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/**
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* Absolute put method. Writes <code>value</code> to position
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* <code>index</code> in the buffer.
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*
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* @exception IndexOutOfBoundsException If index is negative or not smaller
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* than the buffer's limit.
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* @exception ReadOnlyBufferException If this buffer is read-only.
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*/
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public ByteBuffer put (int index, byte value)
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{
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checkIfReadOnly();
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checkIndex(index);
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backing_buffer [index + array_offset] = value;
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return this;
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}
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public char getChar ()
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{
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return ByteBufferHelper.getChar(this, order());
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}
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public ByteBuffer putChar (char value)
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{
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if (readOnly)
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throw new ReadOnlyBufferException ();
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if ( (limit-pos) < 2)
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throw new BufferOverflowException();
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if (endian == ByteOrder.LITTLE_ENDIAN)
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{
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backing_buffer [(pos++) + array_offset] = (byte)(value&0xFF);
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backing_buffer [(pos++) + array_offset] = (byte)(value>>8);
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}
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else
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{
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backing_buffer [(pos++) + array_offset] = (byte)(value>>8);
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backing_buffer [(pos++) + array_offset] = (byte)(value&0xFF);
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}
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return this;
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}
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public char getChar (int index)
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{
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return ByteBufferHelper.getChar(this, index, order());
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}
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public ByteBuffer putChar (int index, char value)
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{
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ByteBufferHelper.putChar(this, index, value, order());
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return this;
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}
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public short getShort ()
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{
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return ByteBufferHelper.getShort(this, order());
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}
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public ByteBuffer putShort (short value)
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{
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ByteBufferHelper.putShort(this, value, order());
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return this;
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}
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public short getShort (int index)
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{
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return ByteBufferHelper.getShort(this, index, order());
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}
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public ByteBuffer putShort (int index, short value)
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{
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ByteBufferHelper.putShort(this, index, value, order());
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return this;
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}
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public int getInt ()
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{
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return ByteBufferHelper.getInt(this, order());
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}
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public ByteBuffer putInt (int value)
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{
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ByteBufferHelper.putInt(this, value, order());
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return this;
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}
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public int getInt (int index)
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{
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return ByteBufferHelper.getInt(this, index, order());
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}
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public ByteBuffer putInt (int index, int value)
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{
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ByteBufferHelper.putInt(this, index, value, order());
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return this;
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}
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public long getLong ()
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{
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return ByteBufferHelper.getLong(this, order());
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}
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public ByteBuffer putLong (long value)
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{
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ByteBufferHelper.putLong (this, value, order());
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return this;
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}
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public long getLong (int index)
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{
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return ByteBufferHelper.getLong (this, index, order());
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}
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public ByteBuffer putLong (int index, long value)
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{
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ByteBufferHelper.putLong (this, index, value, order());
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return this;
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}
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public float getFloat ()
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{
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return ByteBufferHelper.getFloat (this, order());
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}
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public ByteBuffer putFloat (float value)
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{
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ByteBufferHelper.putFloat (this, value, order());
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return this;
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}
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public float getFloat (int index)
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{
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return ByteBufferHelper.getFloat (this, index, order());
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}
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public ByteBuffer putFloat (int index, float value)
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{
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ByteBufferHelper.putFloat (this, index, value, order());
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return this;
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}
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public double getDouble ()
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{
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return ByteBufferHelper.getDouble (this, order());
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}
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public ByteBuffer putDouble (double value)
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{
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ByteBufferHelper.putDouble (this, value, order());
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return this;
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}
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public double getDouble (int index)
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{
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return ByteBufferHelper.getDouble (this, index, order());
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}
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public ByteBuffer putDouble (int index, double value)
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{
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ByteBufferHelper.putDouble (this, index, value, order());
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return this;
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}
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}
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