| /* 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; |
| import org.apache.harmony.nio.internal.DirectBuffer; |
| |
| /** |
| * This class wraps a byte buffer to be a char 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 CharToByteBufferAdapter extends CharBuffer implements DirectBuffer { |
| |
| static CharBuffer wrap(ByteBuffer byteBuffer) { |
| return new CharToByteBufferAdapter(byteBuffer.slice()); |
| } |
| |
| private final ByteBuffer byteBuffer; |
| |
| CharToByteBufferAdapter(ByteBuffer byteBuffer) { |
| super((byteBuffer.capacity() >> 1)); |
| this.byteBuffer = byteBuffer; |
| this.byteBuffer.clear(); |
| } |
| |
| public int getByteCapacity() { |
| if (byteBuffer instanceof DirectBuffer) { |
| return ((DirectBuffer) byteBuffer).getByteCapacity(); |
| } |
| assert false : byteBuffer; |
| return -1; |
| } |
| |
| public PlatformAddress getEffectiveAddress() { |
| if (byteBuffer instanceof DirectBuffer) { |
| // BEGIN android-changed |
| PlatformAddress addr = ((DirectBuffer)byteBuffer).getEffectiveAddress(); |
| effectiveDirectAddress = addr.toInt(); |
| return addr; |
| // END android-changed |
| } |
| assert false : byteBuffer; |
| return null; |
| } |
| |
| public PlatformAddress getBaseAddress() { |
| if (byteBuffer instanceof DirectBuffer) { |
| return ((DirectBuffer) byteBuffer).getBaseAddress(); |
| } |
| assert false : byteBuffer; |
| return null; |
| } |
| |
| public boolean isAddressValid() { |
| if (byteBuffer instanceof DirectBuffer) { |
| return ((DirectBuffer) byteBuffer).isAddressValid(); |
| } |
| assert false : byteBuffer; |
| return false; |
| } |
| |
| public void addressValidityCheck() { |
| if (byteBuffer instanceof DirectBuffer) { |
| ((DirectBuffer) byteBuffer).addressValidityCheck(); |
| } else { |
| assert false : byteBuffer; |
| } |
| } |
| |
| public void free() { |
| if (byteBuffer instanceof DirectBuffer) { |
| ((DirectBuffer) byteBuffer).free(); |
| } else { |
| assert false : byteBuffer; |
| } |
| } |
| |
| @Override |
| public CharBuffer asReadOnlyBuffer() { |
| CharToByteBufferAdapter buf = new CharToByteBufferAdapter(byteBuffer |
| .asReadOnlyBuffer()); |
| buf.limit = limit; |
| buf.position = position; |
| buf.mark = mark; |
| return buf; |
| } |
| |
| @Override |
| public CharBuffer compact() { |
| if (byteBuffer.isReadOnly()) { |
| throw new ReadOnlyBufferException(); |
| } |
| byteBuffer.limit(limit << 1); |
| byteBuffer.position(position << 1); |
| byteBuffer.compact(); |
| byteBuffer.clear(); |
| position = limit - position; |
| limit = capacity; |
| mark = UNSET_MARK; |
| return this; |
| } |
| |
| @Override |
| public CharBuffer duplicate() { |
| CharToByteBufferAdapter buf = new CharToByteBufferAdapter(byteBuffer |
| .duplicate()); |
| buf.limit = limit; |
| buf.position = position; |
| buf.mark = mark; |
| return buf; |
| } |
| |
| @Override |
| public char get() { |
| if (position == limit) { |
| throw new BufferUnderflowException(); |
| } |
| return byteBuffer.getChar(position++ << 1); |
| } |
| |
| @Override |
| public char get(int index) { |
| if (index < 0 || index >= limit) { |
| throw new IndexOutOfBoundsException(); |
| } |
| return byteBuffer.getChar(index << 1); |
| } |
| |
| @Override |
| public boolean isDirect() { |
| return byteBuffer.isDirect(); |
| } |
| |
| @Override |
| public boolean isReadOnly() { |
| return byteBuffer.isReadOnly(); |
| } |
| |
| @Override |
| public ByteOrder order() { |
| return byteBuffer.order(); |
| } |
| |
| @Override |
| protected char[] protectedArray() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| protected int protectedArrayOffset() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| protected boolean protectedHasArray() { |
| return false; |
| } |
| |
| @Override |
| public CharBuffer put(char c) { |
| if (position == limit) { |
| throw new BufferOverflowException(); |
| } |
| byteBuffer.putChar(position++ << 1, c); |
| return this; |
| } |
| |
| @Override |
| public CharBuffer put(int index, char c) { |
| if (index < 0 || index >= limit) { |
| throw new IndexOutOfBoundsException(); |
| } |
| byteBuffer.putChar(index << 1, c); |
| return this; |
| } |
| |
| @Override |
| public CharBuffer slice() { |
| byteBuffer.limit(limit << 1); |
| byteBuffer.position(position << 1); |
| CharBuffer result = new CharToByteBufferAdapter(byteBuffer.slice()); |
| byteBuffer.clear(); |
| return result; |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| if (start < 0 || end < start || end > remaining()) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| CharBuffer result = duplicate(); |
| result.limit(position + end); |
| result.position(position + start); |
| return result; |
| } |
| } |