org.spearce.jgit/src/org/spearce/jgit/lib/DeltaPackedObjectReader.java

   1 package org.spearce.jgit.lib;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5
   6 /** Reader for a deltafied object stored in a pack file. */
   7 abstract class DeltaPackedObjectReader extends PackedObjectReader {
   8     DeltaPackedObjectReader(final PackFile pr, final long offset) {
   9         super(pr, offset);
  10         objectSize = -1;
  11     }
  12
  13     public String getType() throws IOException {
  14         if (objectType == null) {
  15             final ObjectReader b = baseReader();
  16             try {
  17                 objectType = b.getType();
  18             } finally {
  19                 b.close();
  20             }
  21         }
  22         return objectType;
  23     }
  24
  25     public long getSize() throws IOException {
  26         if (objectSize == -1) {
  27             final PatchDeltaStream p;
  28             p = new PatchDeltaStream(packStream(), null);
  29             objectSize = p.getResultLength();
  30             p.close();
  31         }
  32         return objectSize;
  33     }
  34
  35     public InputStream getInputStream() throws IOException {
  36         final ObjectReader b = baseReader();
  37         final PatchDeltaStream p = new PatchDeltaStream(packStream(), b);
  38         if (objectSize == -1)
  39             objectSize = p.getResultLength();
  40         if (objectType == null)
  41             objectType = b.getType();
  42         return p;
  43     }
  44
  45     protected abstract ObjectReader baseReader() throws IOException;
  46 }