432 lines
10 KiB
Java
432 lines
10 KiB
Java
/* DirectByteBufferImpl.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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import gnu.gcj.RawData;
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abstract class DirectByteBufferImpl extends ByteBuffer
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{
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/**
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* The owner is used to keep alive the object that actually owns the
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* memory. There are three possibilities:
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* 1) owner == this: We allocated the memory and we should free it,
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* but *only* in finalize (if we've been sliced
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* other objects will also have access to the
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* memory).
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* 2) owner == null: The byte buffer was created thru
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* JNI.NewDirectByteBuffer. The JNI code is
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* responsible for freeing the memory.
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* 3) owner == some other object: The other object allocated the
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* memory and should free it.
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*/
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private final Object owner;
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static final class ReadOnly extends DirectByteBufferImpl
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{
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ReadOnly(Object owner, RawData address,
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int capacity, int limit,
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int position)
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{
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super(owner, address, capacity, limit, position);
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}
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public ByteBuffer put(byte value)
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{
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throw new ReadOnlyBufferException ();
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}
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public ByteBuffer put(int index, byte value)
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{
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throw new ReadOnlyBufferException ();
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}
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public boolean isReadOnly()
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{
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return true;
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}
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}
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static final class ReadWrite extends DirectByteBufferImpl
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{
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ReadWrite(int capacity)
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{
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super(capacity);
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}
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ReadWrite(RawData address, int capacity)
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{
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super(address, capacity);
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}
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ReadWrite(Object owner, RawData address,
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int capacity, int limit,
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int position)
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{
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super(owner, address, capacity, limit, position);
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}
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public boolean isReadOnly()
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{
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return false;
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}
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}
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DirectByteBufferImpl(int capacity)
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{
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super(capacity, capacity, 0, -1);
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this.owner = this;
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this.address = VMDirectByteBuffer.allocate(capacity);
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}
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DirectByteBufferImpl(RawData address, int capacity)
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{
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super(capacity, capacity, 0, -1);
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this.owner = null;
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this.address = address;
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}
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DirectByteBufferImpl(Object owner, RawData address,
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int capacity, int limit,
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int position)
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{
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super(capacity, limit, position, -1);
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this.owner = owner;
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this.address = address;
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}
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/**
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* Allocates a new direct byte buffer.
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*/
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public static ByteBuffer allocate(int capacity)
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{
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return new DirectByteBufferImpl.ReadWrite(capacity);
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}
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protected void finalize() throws Throwable
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{
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if (owner == this)
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VMDirectByteBuffer.free(address);
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}
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public byte get()
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{
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checkForUnderflow();
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int pos = position();
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byte result = VMDirectByteBuffer.get(address, pos);
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position(pos + 1);
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return result;
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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 VMDirectByteBuffer.get(address, index);
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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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checkForUnderflow(length);
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int index = position();
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VMDirectByteBuffer.get(address, index, dst, offset, length);
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position(index+length);
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return this;
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}
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public ByteBuffer put(byte value)
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{
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checkForOverflow();
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int pos = position();
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VMDirectByteBuffer.put(address, pos, value);
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position(pos + 1);
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return this;
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}
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public ByteBuffer put(int index, byte value)
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{
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checkIndex(index);
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VMDirectByteBuffer.put(address, index, value);
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return this;
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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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VMDirectByteBuffer.shiftDown(address, dst_offset, src_offset, 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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if (pos > 0)
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{
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int count = remaining();
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VMDirectByteBuffer.shiftDown(address, 0, pos, 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 ByteBuffer slice()
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{
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int rem = remaining();
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if (isReadOnly())
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return new DirectByteBufferImpl.ReadOnly
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(owner, VMDirectByteBuffer.adjustAddress(address, position()),
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rem, rem, 0);
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else
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return new DirectByteBufferImpl.ReadWrite
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(owner, VMDirectByteBuffer.adjustAddress(address, position()),
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rem, rem, 0);
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}
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private ByteBuffer 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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DirectByteBufferImpl result;
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if (readOnly)
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result = new DirectByteBufferImpl.ReadOnly(owner, address, capacity(),
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limit(), pos);
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else
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result = new DirectByteBufferImpl.ReadWrite(owner, address, capacity(),
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limit(), pos);
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if (mark != pos)
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{
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result.position(mark);
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result.mark();
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result.position(pos);
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}
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return result;
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}
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public ByteBuffer duplicate()
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{
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return duplicate(isReadOnly());
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}
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public ByteBuffer asReadOnlyBuffer()
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{
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return duplicate(true);
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}
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public boolean isDirect()
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{
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return true;
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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 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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ByteBufferHelper.putChar(this, value, order());
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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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