org.apache.mina.core.file.FileRegion 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.nio.channels.FileChannel;
/**
* Indicates the region of a file to be sent to the remote host.
*
* @author Apache MINA Project
*/
public interface FileRegion {
/**
* The open FileChannel from which data will be read to send to
* remote host.
*
* @return An open FileChannel.
*/
FileChannel getFileChannel();
/**
* The current file position from which data will be read.
*
* @return The current file position.
*/
long getPosition();
/**
* Updates the current file position based on the specified amount. This
* increases the value returned by {@link #getPosition()} and
* {@link #getWrittenBytes()} by the given amount and decreases the value
* returned by {@link #getRemainingBytes()} by the given {@code amount}.
*
* @param amount The new value for the file position.
*/
void update(long amount);
/**
* The number of bytes remaining to be written from the file to the remote
* host.
*
* @return The number of bytes remaining to be written.
*/
long getRemainingBytes();
/**
* The total number of bytes already written.
*
* @return The total number of bytes already written.
*/
long getWrittenBytes();
/**
* Provides an absolute filename for the underlying FileChannel.
*
* @return the absolute filename, or null if the FileRegion
* does not know the filename
*/
String getFilename();
}