92 lines
3.2 KiB
Java
92 lines
3.2 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package org.jboss.netty.buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* A {@link ChannelBufferFactory} which merely allocates a heap buffer with
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* the specified capacity. {@link HeapChannelBufferFactory} should perform
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* very well in most situations because it relies on the JVM garbage collector,
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* which is highly optimized for heap allocation.
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*
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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* @version $Rev: 2197 $, $Date: 2010-02-23 09:43:15 +0900 (Tue, 23 Feb 2010) $
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*/
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public class HeapChannelBufferFactory extends AbstractChannelBufferFactory {
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private static final HeapChannelBufferFactory INSTANCE_BE =
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new HeapChannelBufferFactory(ByteOrder.BIG_ENDIAN);
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private static final HeapChannelBufferFactory INSTANCE_LE =
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new HeapChannelBufferFactory(ByteOrder.LITTLE_ENDIAN);
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public static ChannelBufferFactory getInstance() {
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return INSTANCE_BE;
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}
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public static ChannelBufferFactory getInstance(ByteOrder endianness) {
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if (endianness == ByteOrder.BIG_ENDIAN) {
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return INSTANCE_BE;
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} else if (endianness == ByteOrder.LITTLE_ENDIAN) {
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return INSTANCE_LE;
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} else if (endianness == null) {
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throw new NullPointerException("endianness");
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} else {
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throw new IllegalStateException("Should not reach here");
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}
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}
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/**
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* Creates a new factory whose default {@link ByteOrder} is
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* {@link ByteOrder#BIG_ENDIAN}.
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*/
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public HeapChannelBufferFactory() {
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super();
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}
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/**
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* Creates a new factory with the specified default {@link ByteOrder}.
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*
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* @param defaultOrder the default {@link ByteOrder} of this factory
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*/
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public HeapChannelBufferFactory(ByteOrder defaultOrder) {
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super(defaultOrder);
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}
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public ChannelBuffer getBuffer(ByteOrder order, int capacity) {
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return ChannelBuffers.buffer(order, capacity);
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}
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public ChannelBuffer getBuffer(ByteOrder order, byte[] array, int offset, int length) {
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return ChannelBuffers.wrappedBuffer(order, array, offset, length);
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}
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public ChannelBuffer getBuffer(ByteBuffer nioBuffer) {
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if (nioBuffer.hasArray()) {
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return ChannelBuffers.wrappedBuffer(nioBuffer);
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}
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ChannelBuffer buf = getBuffer(nioBuffer.order(), nioBuffer.remaining());
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int pos = nioBuffer.position();
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buf.writeBytes(nioBuffer);
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nioBuffer.position(pos);
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return buf;
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}
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}
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