org.apache.mina.core.file.DefaultFileRegion 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.mina.core.file;
import java.io.IOException;
import java.nio.channels.FileChannel;
/**
* Manage a File to be sent to a remote host. We keep a track on the current
* position, and the number of already written bytes.
*
*
* @author Apache MINA Project
*/
public class DefaultFileRegion implements FileRegion {
/** The channel used to manage the file */
private final FileChannel channel;
/** The original position in the file */
private final long originalPosition;
/** The position in teh file */
private long position;
/** The number of bytes remaining to write */
private long remainingBytes;
/**
* Creates a new DefaultFileRegion instance
*
* @param channel The channel mapped over the file
* @throws IOException If we had an IO error
*/
public DefaultFileRegion(FileChannel channel) throws IOException {
this(channel, 0, channel.size());
}
/**
* Creates a new DefaultFileRegion instance
*
* @param channel The channel mapped over the file
* @param position The position in teh file
* @param remainingBytes The remaining bytes
*/
public DefaultFileRegion(FileChannel channel, long position, long remainingBytes) {
if (channel == null) {
throw new IllegalArgumentException("channel can not be null");
}
if (position < 0) {
throw new IllegalArgumentException("position may not be less than 0");
}
if (remainingBytes < 0) {
throw new IllegalArgumentException("remainingBytes may not be less than 0");
}
this.channel = channel;
this.originalPosition = position;
this.position = position;
this.remainingBytes = remainingBytes;
}
/**
* {@inheritDoc}
*/
@Override
public long getWrittenBytes() {
return position - originalPosition;
}
/**
* {@inheritDoc}
*/
@Override
public long getRemainingBytes() {
return remainingBytes;
}
/**
* {@inheritDoc}
*/
@Override
public FileChannel getFileChannel() {
return channel;
}
/**
* {@inheritDoc}
*/
@Override
public long getPosition() {
return position;
}
/**
* {@inheritDoc}
*/
@Override
public void update(long value) {
position += value;
remainingBytes -= value;
}
/**
* {@inheritDoc}
*/
@Override
public String getFilename() {
return null;
}
}