DirectReadOnlyByteBuffer.java

/*
 *  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 com.googlecode.gwtgl.array.ArrayBuffer;

/**
 * HeapByteBuffer, ReadWriteHeapByteBuffer and ReadOnlyHeapByteBuffer compose
 * the implementation of array based byte buffers.
 * <p>
 * ReadOnlyHeapByteBuffer extends HeapByteBuffer with all the write methods
 * throwing read only exception.
 * </p>
 * <p>
 * This class is marked final for runtime performance.
 * </p>
 * 
 */
final class DirectReadOnlyByteBuffer extends DirectByteBuffer {

    static DirectReadOnlyByteBuffer copy(DirectByteBuffer other, int markOfOther) {
        DirectReadOnlyByteBuffer buf = new DirectReadOnlyByteBuffer(
                other.byteArray.getBuffer(), other.capacity(), other.byteArray.getByteOffset());
        buf.limit = other.limit();
        buf.position = other.position();
        buf.mark = markOfOther;
        buf.order(other.order());
        return buf;
    }

    DirectReadOnlyByteBuffer(ArrayBuffer backingArray, int capacity, int arrayOffset) {
        super(backingArray, capacity, arrayOffset);
    }

    public ByteBuffer asReadOnlyBuffer() {
        return copy(this, mark);
    }

    public ByteBuffer compact() {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer duplicate() {
        return copy(this, mark);
    }

    public boolean isReadOnly() {
        return true;
    }

    protected byte[] protectedArray() {
        throw new ReadOnlyBufferException();
    }

    protected int protectedArrayOffset() {
        throw new ReadOnlyBufferException();
    }

    protected boolean protectedHasArray() {
        return false;
    }

    public FloatBuffer asFloatBuffer() {
    	return DirectReadOnlyFloatBufferAdapter.wrap(this);
    }
    
    public IntBuffer asIntBuffer() {
    	return order() == ByteOrder.nativeOrder() 
    		? DirectReadOnlyIntBufferAdapter.wrap(this) 
    		: super.asIntBuffer();
    }
    
    public ShortBuffer asShortBuffer() {
    	return order() == ByteOrder.nativeOrder() 
    		? DirectReadOnlyShortBufferAdapter.wrap(this) 
    		: super.asShortBuffer();
    }
    
    public ByteBuffer put(byte b) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer put(int index, byte b) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer put(byte[] src, int off, int len) {
        throw new ReadOnlyBufferException();
    }
    
    public ByteBuffer putDouble(double value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putDouble(int index, double value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putFloat(float value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putFloat(int index, float value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putInt(int value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putInt(int index, int value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putLong(int index, long value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putLong(long value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putShort(int index, short value) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer putShort(short value) {
        throw new ReadOnlyBufferException();
    }
    
    public ByteBuffer put(ByteBuffer buf) {
        throw new ReadOnlyBufferException();
    }

    public ByteBuffer slice() {
        DirectReadOnlyByteBuffer slice = new DirectReadOnlyByteBuffer(byteArray.getBuffer(),
                remaining(), byteArray.getByteOffset() + position);
        slice.order = order;
        return slice;
    }
}