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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 org.apache.dubbo.remoting.buffer;
import java.nio.ByteBuffer;
public final class ChannelBuffers {
public static final ChannelBuffer EMPTY_BUFFER = new HeapChannelBuffer(0);
public static final int DEFAULT_CAPACITY = 256;
private ChannelBuffers() {
}
public static ChannelBuffer dynamicBuffer() {
return dynamicBuffer(DEFAULT_CAPACITY);
}
public static ChannelBuffer dynamicBuffer(int capacity) {
return new DynamicChannelBuffer(capacity);
}
public static ChannelBuffer dynamicBuffer(int capacity,
ChannelBufferFactory factory) {
return new DynamicChannelBuffer(capacity, factory);
}
public static ChannelBuffer buffer(int capacity) {
if (capacity < 0) {
throw new IllegalArgumentException("capacity can not be negative");
}
if (capacity == 0) {
return EMPTY_BUFFER;
}
return new HeapChannelBuffer(capacity);
}
public static ChannelBuffer wrappedBuffer(byte[] array, int offset, int length) {
if (array == null) {
throw new NullPointerException("array == null");
}
byte[] dest = new byte[length];
System.arraycopy(array, offset, dest, 0, length);
return wrappedBuffer(dest);
}
public static ChannelBuffer wrappedBuffer(byte[] array) {
if (array == null) {
throw new NullPointerException("array == null");
}
if (array.length == 0) {
return EMPTY_BUFFER;
}
return new HeapChannelBuffer(array);
}
public static ChannelBuffer wrappedBuffer(ByteBuffer buffer) {
if (!buffer.hasRemaining()) {
return EMPTY_BUFFER;
}
if (buffer.hasArray()) {
return wrappedBuffer(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining());
} else {
return new ByteBufferBackedChannelBuffer(buffer);
}
}
public static ChannelBuffer directBuffer(int capacity) {
if (capacity == 0) {
return EMPTY_BUFFER;
}
ChannelBuffer buffer = new ByteBufferBackedChannelBuffer(
ByteBuffer.allocateDirect(capacity));
buffer.clear();
return buffer;
}
public static boolean equals(ChannelBuffer bufferA, ChannelBuffer bufferB) {
final int aLen = bufferA.readableBytes();
if (aLen != bufferB.readableBytes()) {
return false;
}
final int byteCount = aLen & 7;
int aIndex = bufferA.readerIndex();
int bIndex = bufferB.readerIndex();
for (int i = byteCount; i > 0; i--) {
if (bufferA.getByte(aIndex) != bufferB.getByte(bIndex)) {
return false;
}
aIndex++;
bIndex++;
}
return true;
}
// prefix
public static boolean prefixEquals(ChannelBuffer bufferA, ChannelBuffer bufferB, int count) {
final int aLen = bufferA.readableBytes();
final int bLen = bufferB.readableBytes();
if (aLen < count || bLen < count) {
return false;
}
int aIndex = bufferA.readerIndex();
int bIndex = bufferB.readerIndex();
for (int i = count; i > 0; i--) {
if (bufferA.getByte(aIndex) != bufferB.getByte(bIndex)) {
return false;
}
aIndex++;
bIndex++;
}
return true;
}
public static int hasCode(ChannelBuffer buffer) {
final int aLen = buffer.readableBytes();
final int byteCount = aLen & 7;
int hashCode = 1;
int arrayIndex = buffer.readerIndex();
for (int i = byteCount; i > 0; i--) {
hashCode = 31 * hashCode + buffer.getByte(arrayIndex++);
}
if (hashCode == 0) {
hashCode = 1;
}
return hashCode;
}
public static int compare(ChannelBuffer bufferA, ChannelBuffer bufferB) {
final int aLen = bufferA.readableBytes();
final int bLen = bufferB.readableBytes();
final int minLength = Math.min(aLen, bLen);
int aIndex = bufferA.readerIndex();
int bIndex = bufferB.readerIndex();
for (int i = minLength; i > 0; i--) {
byte va = bufferA.getByte(aIndex);
byte vb = bufferB.getByte(bIndex);
if (va > vb) {
return 1;
} else if (va < vb) {
return -1;
}
aIndex++;
bIndex++;
}
return aLen - bLen;
}
}