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

   1 /*
   2  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  *
  13  * - Redistributions in binary form must reproduce the above
  14  *   copyright notice, this list of conditions and the following
  15  *   disclaimer in the documentation and/or other materials provided
  16  *   with the distribution.
  17  *
  18  * - Neither the name of the Git Development Community nor the
  19  *   names of its contributors may be used to endorse or promote
  20  *   products derived from this software without specific prior
  21  *   written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  24  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  32  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 package org.spearce.jgit.lib;
  39
  40 import java.io.IOException;
  41 import java.util.zip.DataFormatException;
  42
  43 import org.spearce.jgit.errors.CorruptObjectException;
  44
  45 /** Reader for a non-delta (just deflated) object in a pack file. */
  46 class WholePackedObjectLoader extends PackedObjectLoader {
  47         private static final int OBJ_COMMIT = Constants.OBJ_COMMIT;
  48
  49         WholePackedObjectLoader(final WindowCursor curs, final PackFile pr,
  50                         final long offset, final int type, final int size) {
  51                 super(curs, pr, offset);
  52                 objectType = type;
  53                 objectSize = size;
  54         }
  55
  56         @Override
  57         public byte[] getCachedBytes() throws IOException {
  58                 if (objectType != OBJ_COMMIT) {
  59                         final UnpackedObjectCache.Entry cache = pack.readCache(dataOffset);
  60                         if (cache != null) {
  61                                 curs.release();
  62                                 return cache.data;
  63                         }
  64                 }
  65
  66                 try {
  67                         final byte[] data = pack.decompress(dataOffset, objectSize, curs);
  68                         curs.release();
  69                         if (objectType != OBJ_COMMIT)
  70                                 pack.saveCache(dataOffset, data, objectType);
  71                         return data;
  72                 } catch (DataFormatException dfe) {
  73                         final CorruptObjectException coe;
  74                         coe = new CorruptObjectException(getId(), "bad stream");
  75                         coe.initCause(dfe);
  76                         throw coe;
  77                 }
  78         }
  79 }