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/* 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 libcore.io.SizeOf;
/**
* This class wraps a byte buffer to be a short buffer.
* <p>
* Implementation notice:
* <ul>
* <li>After a byte buffer instance is wrapped, it becomes privately owned by
* the adapter. It must NOT be accessed outside the adapter any more.</li>
* <li>The byte buffer's position and limit are NOT linked with the adapter.
* The adapter extends Buffer, thus has its own position and limit.</li>
* </ul>
* </p>
*/
final class ByteBufferAsShortBuffer extends ShortBuffer {
private final ByteBuffer byteBuffer;
static ShortBuffer asShortBuffer(ByteBuffer byteBuffer) {
ByteBuffer slice = byteBuffer.slice();
slice.order(byteBuffer.order());
return new ByteBufferAsShortBuffer(slice);
}
private ByteBufferAsShortBuffer(ByteBuffer byteBuffer) {
super(byteBuffer.capacity() / SizeOf.SHORT, byteBuffer.effectiveDirectAddress);
this.byteBuffer = byteBuffer;
this.byteBuffer.clear();
}
@Override
public ShortBuffer asReadOnlyBuffer() {
ByteBufferAsShortBuffer buf = new ByteBufferAsShortBuffer(byteBuffer.asReadOnlyBuffer());
buf.limit = limit;
buf.position = position;
buf.mark = mark;
buf.byteBuffer.order = byteBuffer.order;
return buf;
}
@Override
public ShortBuffer compact() {
if (byteBuffer.isReadOnly()) {
throw new ReadOnlyBufferException();
}
byteBuffer.limit(limit * SizeOf.SHORT);
byteBuffer.position(position * SizeOf.SHORT);
byteBuffer.compact();
byteBuffer.clear();
position = limit - position;
limit = capacity;
mark = UNSET_MARK;
return this;
}
@Override
public ShortBuffer duplicate() {
ByteBuffer bb = byteBuffer.duplicate().order(byteBuffer.order());
ByteBufferAsShortBuffer buf = new ByteBufferAsShortBuffer(bb);
buf.limit = limit;
buf.position = position;
buf.mark = mark;
return buf;
}
@Override
public short get() {
if (position == limit) {
throw new BufferUnderflowException();
}
return byteBuffer.getShort(position++ * SizeOf.SHORT);
}
@Override
public short get(int index) {
checkIndex(index);
return byteBuffer.getShort(index * SizeOf.SHORT);
}
@Override
public ShortBuffer get(short[] dst, int dstOffset, int shortCount) {
byteBuffer.limit(limit * SizeOf.SHORT);
byteBuffer.position(position * SizeOf.SHORT);
if (byteBuffer instanceof DirectByteBuffer) {
((DirectByteBuffer) byteBuffer).get(dst, dstOffset, shortCount);
} else {
((ByteArrayBuffer) byteBuffer).get(dst, dstOffset, shortCount);
}
this.position += shortCount;
return this;
}
@Override
public boolean isDirect() {
return byteBuffer.isDirect();
}
@Override
public boolean isReadOnly() {
return byteBuffer.isReadOnly();
}
@Override
public ByteOrder order() {
return byteBuffer.order();
}
@Override short[] protectedArray() {
throw new UnsupportedOperationException();
}
@Override int protectedArrayOffset() {
throw new UnsupportedOperationException();
}
@Override boolean protectedHasArray() {
return false;
}
@Override
public ShortBuffer put(short c) {
if (position == limit) {
throw new BufferOverflowException();
}
byteBuffer.putShort(position++ * SizeOf.SHORT, c);
return this;
}
@Override
public ShortBuffer put(int index, short c) {
checkIndex(index);
byteBuffer.putShort(index * SizeOf.SHORT, c);
return this;
}
@Override
public ShortBuffer put(short[] src, int srcOffset, int shortCount) {
byteBuffer.limit(limit * SizeOf.SHORT);
byteBuffer.position(position * SizeOf.SHORT);
if (byteBuffer instanceof DirectByteBuffer) {
((DirectByteBuffer) byteBuffer).put(src, srcOffset, shortCount);
} else {
((ByteArrayBuffer) byteBuffer).put(src, srcOffset, shortCount);
}
this.position += shortCount;
return this;
}
@Override
public ShortBuffer slice() {
byteBuffer.limit(limit * SizeOf.SHORT);
byteBuffer.position(position * SizeOf.SHORT);
ByteBuffer bb = byteBuffer.slice().order(byteBuffer.order());
ShortBuffer result = new ByteBufferAsShortBuffer(bb);
byteBuffer.clear();
return result;
}
}
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