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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.core.file;
    21
    22  import java.io.IOException;
    23  import java.nio.channels.FileChannel;
    24
    25  /**
    26   * TODO Add documentation
    27   *
    28   *
    29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    30   */
    31  public class DefaultFileRegion implements FileRegion {
    32
    33      private final FileChannel channel;
    34
    35      private final long originalPosition;
    36
    37      private long position;
    38
    39      private long remainingBytes;
    40
    41      public DefaultFileRegion(FileChannel channel) throws IOException {
    42          this(channel, 0, channel.size());
    43      }
    44
    45      public DefaultFileRegion(FileChannel channel, long position, long remainingBytes) {
    46          if (channel == null) {
    47              throw new IllegalArgumentException("channel can not be null");
    48          }
    49          if (position < 0) {
    50              throw new IllegalArgumentException("position may not be less than 0");
    51          }
    52          if (remainingBytes < 0) {
    53              throw new IllegalArgumentException("remainingBytes may not be less than 0");
    54          }
    55          this.channel = channel;
    56          this.originalPosition = position;
    57          this.position = position;
    58          this.remainingBytes = remainingBytes;
    59      }
    60
    61      public long getWrittenBytes() {
    62          return position - originalPosition;
    63      }
    64
    65      public long getRemainingBytes() {
    66          return remainingBytes;
    67      }
    68
    69      public FileChannel getFileChannel() {
    70          return channel;
    71      }
    72
    73      public long getPosition() {
    74          return position;
    75      }
    76
    77      public void update(long value) {
    78          position += value;
    79          remainingBytes -= value;
    80      }
    81
    82      public String getFilename() {
    83          return null;
    84      }
    85
    86  }