org.apache.qpid.util.ByteBufferUtils Maven / Gradle / Ivy
/*
*
* 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.qpid.util;
import java.nio.ByteBuffer;
import java.util.Collection;
import org.apache.qpid.bytebuffer.QpidByteBuffer;
public class ByteBufferUtils
{
private static final ByteBuffer EMPTY_BYTE_BUFFER = ByteBuffer.allocate(0);
public static ByteBuffer combine(Collection bufs)
{
if(bufs == null || bufs.isEmpty())
{
return EMPTY_BYTE_BUFFER;
}
else
{
int size = 0;
boolean isDirect = false;
for(QpidByteBuffer buf : bufs)
{
size += buf.remaining();
isDirect = isDirect || buf.isDirect();
}
ByteBuffer combined = isDirect ? ByteBuffer.allocateDirect(size) : ByteBuffer.allocate(size);
for(QpidByteBuffer buf : bufs)
{
buf.copyTo(combined);
}
combined.flip();
return combined;
}
}
public static int remaining(Collection bufs)
{
int size = 0;
if (bufs != null && !bufs.isEmpty())
{
for (QpidByteBuffer buf : bufs)
{
size += buf.remaining();
}
}
return size;
}
}