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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 char buffer.
 * 

* Implementation notice: *

    *
  • After a byte buffer instance is wrapped, it becomes privately owned by * the adapter. It must NOT be accessed outside the adapter any more.
  • *
  • The byte buffer's position and limit are NOT linked with the adapter. * The adapter extends Buffer, thus has its own position and limit.
  • *
*

* */ final class ByteBufferAsCharBuffer extends CharBuffer { private final ByteBuffer byteBuffer; static CharBuffer asCharBuffer(ByteBuffer byteBuffer) { ByteBuffer slice = byteBuffer.slice(); slice.order(byteBuffer.order()); return new ByteBufferAsCharBuffer(slice); } private ByteBufferAsCharBuffer(ByteBuffer byteBuffer) { super(byteBuffer.capacity() / SizeOf.CHAR); this.byteBuffer = byteBuffer; this.byteBuffer.clear(); this.effectiveDirectAddress = byteBuffer.effectiveDirectAddress; } @Override public CharBuffer asReadOnlyBuffer() { ByteBufferAsCharBuffer buf = new ByteBufferAsCharBuffer(byteBuffer.asReadOnlyBuffer()); buf.limit = limit; buf.position = position; buf.mark = mark; buf.byteBuffer.order = byteBuffer.order; return buf; } @Override public CharBuffer compact() { if (byteBuffer.isReadOnly()) { throw new ReadOnlyBufferException(); } byteBuffer.limit(limit * SizeOf.CHAR); byteBuffer.position(position * SizeOf.CHAR); byteBuffer.compact(); byteBuffer.clear(); position = limit - position; limit = capacity; mark = UNSET_MARK; return this; } @Override public CharBuffer duplicate() { ByteBuffer bb = byteBuffer.duplicate().order(byteBuffer.order()); ByteBufferAsCharBuffer buf = new ByteBufferAsCharBuffer(bb); 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++ * SizeOf.CHAR); } @Override public char get(int index) { checkIndex(index); return byteBuffer.getChar(index * SizeOf.CHAR); } @Override public CharBuffer get(char[] dst, int dstOffset, int charCount) { byteBuffer.limit(limit * SizeOf.CHAR); byteBuffer.position(position * SizeOf.CHAR); if (byteBuffer instanceof DirectByteBuffer) { ((DirectByteBuffer) byteBuffer).get(dst, dstOffset, charCount); } else { ((ByteArrayBuffer) byteBuffer).get(dst, dstOffset, charCount); } this.position += charCount; return this; } @Override public boolean isDirect() { return byteBuffer.isDirect(); } @Override public boolean isReadOnly() { return byteBuffer.isReadOnly(); } @Override public ByteOrder order() { return byteBuffer.order(); } @Override char[] protectedArray() { throw new UnsupportedOperationException(); } @Override int protectedArrayOffset() { throw new UnsupportedOperationException(); } @Override boolean protectedHasArray() { return false; } @Override public CharBuffer put(char c) { if (position == limit) { throw new BufferOverflowException(); } byteBuffer.putChar(position++ * SizeOf.CHAR, c); return this; } @Override public CharBuffer put(int index, char c) { checkIndex(index); byteBuffer.putChar(index * SizeOf.CHAR, c); return this; } @Override public CharBuffer put(char[] src, int srcOffset, int charCount) { byteBuffer.limit(limit * SizeOf.CHAR); byteBuffer.position(position * SizeOf.CHAR); if (byteBuffer instanceof DirectByteBuffer) { ((DirectByteBuffer) byteBuffer).put(src, srcOffset, charCount); } else { ((ByteArrayBuffer) byteBuffer).put(src, srcOffset, charCount); } this.position += charCount; return this; } @Override public CharBuffer slice() { byteBuffer.limit(limit * SizeOf.CHAR); byteBuffer.position(position * SizeOf.CHAR); ByteBuffer bb = byteBuffer.slice().order(byteBuffer.order()); CharBuffer result = new ByteBufferAsCharBuffer(bb); byteBuffer.clear(); return result; } @Override public CharBuffer subSequence(int start, int end) { checkStartEndRemaining(start, end); CharBuffer result = duplicate(); result.limit(position + end); result.position(position + start); return result; } }




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