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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * Licensed 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 com.generallycloud.baseio.buffer;

import java.nio.ByteBuffer;

import com.generallycloud.baseio.common.ByteBufferUtil;

/**
 * @author wangkai
 *
 */
public class UnpooledDirectByteBuf extends AbstractDirectByteBuf {

	protected UnpooledDirectByteBuf(ByteBufAllocator allocator, ByteBuffer memory) {
		super(allocator, memory);
		this.produce(memory.capacity());
	}

	protected void produce(int capacity) {
		this.capacity = capacity;
		this.limit(capacity);
		this.referenceCount = 1;
	}

	@Override
	public ByteBuf reallocate(int limit, boolean copyOld) {

		ByteBuffer newMemory = ByteBuffer.allocateDirect(limit);

		if (copyOld) {
			memory.flip();
			newMemory.put(memory);
			ByteBufferUtil.release(memory);
		}else{
			this.position(0);
		}

		this.memory = newMemory;
		this.capacity = limit;
		this.limit(limit);
		this.referenceCount = 1;
		return this;
	}

	/**
	 * NOTICE 该方法非线程安全
	 */
	@Override
	public ByteBuf doDuplicate() {
		return new DuplicateByteBuf(new UnpooledDirectByteBuf(allocator, memory.duplicate()), this);
	}

	@Override
	public void doRelease() {
		ByteBufferUtil.release(memory);
	}

	@Override
	public PooledByteBuf newByteBuf(ByteBufAllocator allocator) {
		throw new UnsupportedOperationException();
	}

}