001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.mina.core.file; 021 022import java.io.IOException; 023import java.nio.channels.FileChannel; 024 025/** 026 * TODO Add documentation 027 * 028 * 029 * @author <a href="http://mina.apache.org">Apache MINA Project</a> 030 */ 031public class DefaultFileRegion implements FileRegion { 032 033 private final FileChannel channel; 034 035 private final long originalPosition; 036 037 private long position; 038 039 private long remainingBytes; 040 041 public DefaultFileRegion(FileChannel channel) throws IOException { 042 this(channel, 0, channel.size()); 043 } 044 045 public DefaultFileRegion(FileChannel channel, long position, long remainingBytes) { 046 if (channel == null) { 047 throw new IllegalArgumentException("channel can not be null"); 048 } 049 050 if (position < 0) { 051 throw new IllegalArgumentException("position may not be less than 0"); 052 } 053 054 if (remainingBytes < 0) { 055 throw new IllegalArgumentException("remainingBytes may not be less than 0"); 056 } 057 058 this.channel = channel; 059 this.originalPosition = position; 060 this.position = position; 061 this.remainingBytes = remainingBytes; 062 } 063 064 public long getWrittenBytes() { 065 return position - originalPosition; 066 } 067 068 public long getRemainingBytes() { 069 return remainingBytes; 070 } 071 072 public FileChannel getFileChannel() { 073 return channel; 074 } 075 076 public long getPosition() { 077 return position; 078 } 079 080 public void update(long value) { 081 position += value; 082 remainingBytes -= value; 083 } 084 085 public String getFilename() { 086 return null; 087 } 088 089}