/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.nio;
import org.apache.harmony.luni.platform.PlatformAddress;
/**
* DirectByteBuffer, ReadWriteDirectByteBuffer and ReadOnlyDirectByteBuffer
* compose the implementation of platform memory based byte buffers.
* <p>
* ReadWriteDirectByteBuffer extends DirectByteBuffer with all the write
* methods.
* </p>
* <p>
* This class is marked final for runtime performance.
* </p>
*
*/
final class ReadWriteDirectByteBuffer extends DirectByteBuffer {
static ReadWriteDirectByteBuffer copy(DirectByteBuffer other,
int markOfOther) {
ReadWriteDirectByteBuffer buf = new ReadWriteDirectByteBuffer(
other.address, other.capacity(), other.offset);
buf.limit = other.limit();
buf.position = other.position();
buf.mark = markOfOther;
buf.order(other.order());
return buf;
}
ReadWriteDirectByteBuffer(int capacity) {
super(capacity);
}
ReadWriteDirectByteBuffer(PlatformAddress address, int capacity, int offset) {
super(address, capacity, offset);
}
/*
* This constructor is specifically for MappedByteBuffer construction
*/
ReadWriteDirectByteBuffer(PlatformAddress address, int capacity,
int offset, int mapMode) {
super(address, capacity, offset);
this.mapMode = mapMode;
}
@Override
public ByteBuffer asReadOnlyBuffer() {
return ReadOnlyDirectByteBuffer.copy(this, mark);
}
@Override
public ByteBuffer compact() {
PlatformAddress effectiveAddress = getEffectiveAddress();
effectiveAddress.offsetBytes(position).moveTo(effectiveAddress,
remaining());
position = limit - position;
limit = capacity;
mark = UNSET_MARK;
return this;
}
@Override
public ByteBuffer duplicate() {
return copy(this, mark);
}
@Override
public boolean isReadOnly() {
return false;
}
@Override
public ByteBuffer put(byte value) {
if (position == limit) {
throw new BufferOverflowException();
}
getBaseAddress().setByte(offset + position++, value);
return this;
}
@Override
public ByteBuffer put(int index, byte value) {
if (index < 0 || index >= limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setByte(offset + index, value);
return this;
}
/*
* Override ByteBuffer.put(byte[], int, int) to improve performance.
*
* (non-Javadoc)
*
* @see java.nio.ByteBuffer#put(byte[], int, int)
*/
@Override
public ByteBuffer put(byte[] src, int off, int len) {
int length = src.length;
if (off < 0 || len < 0 || (long) off + (long) len > length) {
throw new IndexOutOfBoundsException();
}
if (len > remaining()) {
throw new BufferOverflowException();
}
getBaseAddress().setByteArray(offset + position, src, off, len);
position += len;
return this;
}
@Override
public ByteBuffer putDouble(double value) {
int newPosition = position + 8;
if (newPosition > limit) {
throw new BufferOverflowException();
}
getBaseAddress().setDouble(offset + position, value, order);
position = newPosition;
return this;
}
@Override
public ByteBuffer putDouble(int index, double value) {
if (index < 0 || (long) index + 8 > limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setDouble(offset + index, value, order);
return this;
}
@Override
public ByteBuffer putFloat(float value) {
int newPosition = position + 4;
if (newPosition > limit) {
throw new BufferOverflowException();
}
getBaseAddress().setFloat(offset + position, value, order);
position = newPosition;
return this;
}
@Override
public ByteBuffer putFloat(int index, float value) {
if (index < 0 || (long) index + 4 > limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setFloat(offset + index, value, order);
return this;
}
@Override
public ByteBuffer putInt(int value) {
int newPosition = position + 4;
if (newPosition > limit) {
throw new BufferOverflowException();
}
getBaseAddress().setInt(offset + position, value, order);
position = newPosition;
return this;
}
@Override
public ByteBuffer putInt(int index, int value) {
if (index < 0 || (long) index + 4 > limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setInt(offset + index, value, order);
return this;
}
@Override
public ByteBuffer putLong(long value) {
int newPosition = position + 8;
if (newPosition > limit) {
throw new BufferOverflowException();
}
getBaseAddress().setLong(offset + position, value, order);
position = newPosition;
return this;
}
@Override
public ByteBuffer putLong(int index, long value) {
if (index < 0 || (long) index + 8 > limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setLong(offset + index, value, order);
return this;
}
@Override
public ByteBuffer putShort(short value) {
int newPosition = position + 2;
if (newPosition > limit) {
throw new BufferOverflowException();
}
getBaseAddress().setShort(offset + position, value, order);
position = newPosition;
return this;
}
@Override
public ByteBuffer putShort(int index, short value) {
if (index < 0 || (long) index + 2 > limit) {
throw new IndexOutOfBoundsException();
}
getBaseAddress().setShort(offset + index, value, order);
return this;
}
@Override
public ByteBuffer slice() {
ReadWriteDirectByteBuffer buf = new ReadWriteDirectByteBuffer(
address, remaining(), offset + position);
buf.order = order;
return buf;
}
}