| /* 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 ShortToByteBufferAdapter extends ShortBuffer { |
| |
| private final ByteBuffer byteBuffer; |
| |
| static ShortBuffer asShortBuffer(ByteBuffer byteBuffer) { |
| ByteBuffer slice = byteBuffer.slice(); |
| slice.order(byteBuffer.order()); |
| return new ShortToByteBufferAdapter(slice); |
| } |
| |
| private ShortToByteBufferAdapter(ByteBuffer byteBuffer) { |
| super(byteBuffer.capacity() / SizeOf.SHORT); |
| this.byteBuffer = byteBuffer; |
| this.byteBuffer.clear(); |
| this.effectiveDirectAddress = byteBuffer.effectiveDirectAddress; |
| } |
| |
| @Override |
| public ShortBuffer asReadOnlyBuffer() { |
| ShortToByteBufferAdapter buf = new ShortToByteBufferAdapter(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()); |
| ShortToByteBufferAdapter buf = new ShortToByteBufferAdapter(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 { |
| ((HeapByteBuffer) 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 ReadWriteDirectByteBuffer) { |
| ((ReadWriteDirectByteBuffer) byteBuffer).put(src, srcOffset, shortCount); |
| } else { |
| ((ReadWriteHeapByteBuffer) 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 ShortToByteBufferAdapter(bb); |
| byteBuffer.clear(); |
| return result; |
| } |
| |
| } |