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172 lines
5.0 KiB
Java
172 lines
5.0 KiB
Java
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/* LongViewBufferImpl.java --
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Copyright (C) 2003, 2004 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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final class LongViewBufferImpl extends LongBuffer
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{
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/** Position in bb (i.e. a byte offset) where this buffer starts. */
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private final int offset;
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private final ByteBuffer bb;
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private final boolean readOnly;
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private final ByteOrder endian;
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LongViewBufferImpl (ByteBuffer bb, int capacity)
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{
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super (capacity, capacity, 0, -1, bb.isDirect() ?
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VMDirectByteBuffer.adjustAddress(bb.address, bb.position()):null, null, 0);
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this.bb = bb;
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this.offset = bb.position();
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this.readOnly = bb.isReadOnly();
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this.endian = bb.order();
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}
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public LongViewBufferImpl (ByteBuffer bb, int offset, int capacity,
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int limit, int position, int mark,
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boolean readOnly, ByteOrder endian)
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{
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super (capacity, limit, position, mark, bb.isDirect() ?
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VMDirectByteBuffer.adjustAddress(bb.address, offset):null, null, 0);
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this.bb = bb;
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this.offset = offset;
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this.readOnly = readOnly;
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this.endian = endian;
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}
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/**
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* Reads the <code>long</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>longs</code> in this buffer.
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*/
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public long get ()
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{
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int p = position();
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long result = ByteBufferHelper.getLong(bb, (p << 3) + offset, endian);
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position(p + 1);
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return result;
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}
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/**
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* Absolute get method. Reads the <code>long</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 long get (int index)
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{
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return ByteBufferHelper.getLong(bb, (index << 3) + offset, endian);
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}
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public LongBuffer put (long value)
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{
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int p = position();
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ByteBufferHelper.putLong(bb, (p << 3) + offset, value, endian);
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position(p + 1);
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return this;
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}
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public LongBuffer put (int index, long value)
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{
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ByteBufferHelper.putLong(bb, (index << 3) + offset, value, endian);
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return this;
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}
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public LongBuffer compact ()
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{
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if (position () > 0)
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{
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int count = limit () - position ();
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bb.shiftDown(offset, offset + 8 * position(), 8 * count);
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position (count);
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limit (capacity ());
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}
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else
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{
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position(limit());
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limit(capacity());
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}
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return this;
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}
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public LongBuffer slice ()
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{
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// Create a sliced copy of this object that shares its content.
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return new LongViewBufferImpl (bb, (position () << 3) + offset,
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remaining(), remaining(), 0, -1,
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readOnly, endian);
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}
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LongBuffer duplicate (boolean readOnly)
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{
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int pos = position();
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reset();
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int mark = position();
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position(pos);
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return new LongViewBufferImpl (bb, offset, capacity(), limit(),
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pos, mark, readOnly, endian);
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}
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public LongBuffer duplicate ()
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{
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return duplicate(readOnly);
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}
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public LongBuffer asReadOnlyBuffer ()
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{
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return duplicate(true);
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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 boolean isDirect ()
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{
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return bb.isDirect ();
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}
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public ByteOrder order ()
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{
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return endian;
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}
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}
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