src/java/org/apache/poi/poifs/storage/RawDataBlockList.java

   1
   2 /* ====================================================================
   3    Licensed to the Apache Software Foundation (ASF) under one or more
   4    contributor license agreements.  See the NOTICE file distributed with
   5    this work for additional information regarding copyright ownership.
   6    The ASF licenses this file to You under the Apache License, Version 2.0
   7    (the "License"); you may not use this file except in compliance with
   8    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, software
  13    distributed under the License is distributed on an "AS IS" BASIS,
  14    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15    See the License for the specific language governing permissions and
  16    limitations under the License.
  17 ==================================================================== */
  18
  19
  20 package org.apache.poi.poifs.storage;
  21
  22 import java.io.*;
  23
  24 import java.util.*;
  25
  26 /**
  27  * A list of RawDataBlocks instances, and methods to manage the list
  28  *
  29  * @author Marc Johnson (mjohnson at apache dot org
  30  */
  31
  32 public class RawDataBlockList
  33     extends BlockListImpl
  34 {
  35
  36     /**
  37      * Constructor RawDataBlockList
  38      *
  39      * @param stream the InputStream from which the data will be read
  40      * @param bigBlockSize The big block size, either 512 bytes or 4096 bytes
  41      *
  42      * @exception IOException on I/O errors, and if an incomplete
  43      *            block is read
  44      */
  45
  46     public RawDataBlockList(final InputStream stream, int bigBlockSize)
  47         throws IOException
  48     {
  49         List blocks = new ArrayList();
  50
  51         while (true)
  52         {
  53             RawDataBlock block = new RawDataBlock(stream, bigBlockSize);
  54
  55             // If there was data, add the block to the list
  56             if(block.hasData()) {
  57                 blocks.add(block);
  58             }
  59
  60             // If the stream is now at the End Of File, we're done
  61             if (block.eof()) {
  62                 break;
  63             }
  64         }
  65         setBlocks(( RawDataBlock [] ) blocks.toArray(new RawDataBlock[ 0 ]));
  66     }
  67 }   // end public class RawDataBlockList
  68