LargePackedWholeObject.java

  1. /*
  2.  * Copyright (C) 2010, Google Inc.
  3.  * and other copyright owners as documented in the project's IP log.
  4.  *
  5.  * This program and the accompanying materials are made available
  6.  * under the terms of the Eclipse Distribution License v1.0 which
  7.  * accompanies this distribution, is reproduced below, and is
  8.  * available at http://www.eclipse.org/org/documents/edl-v10.php
  9.  *
  10.  * All rights reserved.
  11.  *
  12.  * Redistribution and use in source and binary forms, with or
  13.  * without modification, are permitted provided that the following
  14.  * conditions are met:
  15.  *
  16.  * - Redistributions of source code must retain the above copyright
  17.  *   notice, this list of conditions and the following disclaimer.
  18.  *
  19.  * - Redistributions in binary form must reproduce the above
  20.  *   copyright notice, this list of conditions and the following
  21.  *   disclaimer in the documentation and/or other materials provided
  22.  *   with the distribution.
  23.  *
  24.  * - Neither the name of the Eclipse Foundation, Inc. nor the
  25.  *   names of its contributors may be used to endorse or promote
  26.  *   products derived from this software without specific prior
  27.  *   written permission.
  28.  *
  29.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  30.  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  31.  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  32.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33.  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  34.  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  35.  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  37.  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  38.  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  41.  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42.  */

  43. package org.eclipse.jgit.internal.storage.file;

  44. import java.io.BufferedInputStream;
  45. import java.io.IOException;
  46. import java.io.InputStream;
  47. import java.util.zip.InflaterInputStream;

  48. import org.eclipse.jgit.errors.LargeObjectException;
  49. import org.eclipse.jgit.errors.MissingObjectException;
  50. import org.eclipse.jgit.lib.ObjectId;
  51. import org.eclipse.jgit.lib.ObjectLoader;
  52. import org.eclipse.jgit.lib.ObjectStream;

  53. class LargePackedWholeObject extends ObjectLoader {
  54.     private final int type;

  55.     private final long size;

  56.     private final long objectOffset;

  57.     private final int headerLength;

  58.     private final PackFile pack;

  59.     private final FileObjectDatabase db;

  60.     LargePackedWholeObject(int type, long size, long objectOffset,
  61.             int headerLength, PackFile pack, FileObjectDatabase db) {
  62.         this.type = type;
  63.         this.size = size;
  64.         this.objectOffset = objectOffset;
  65.         this.headerLength = headerLength;
  66.         this.pack = pack;
  67.         this.db = db;
  68.     }

  69.     /** {@inheritDoc} */
  70.     @Override
  71.     public int getType() {
  72.         return type;
  73.     }

  74.     /** {@inheritDoc} */
  75.     @Override
  76.     public long getSize() {
  77.         return size;
  78.     }

  79.     /** {@inheritDoc} */
  80.     @Override
  81.     public boolean isLarge() {
  82.         return true;
  83.     }

  84.     /** {@inheritDoc} */
  85.     @Override
  86.     public byte[] getCachedBytes() throws LargeObjectException {
  87.         try {
  88.             throw new LargeObjectException(getObjectId());
  89.         } catch (IOException cannotObtainId) {
  90.             throw new LargeObjectException(cannotObtainId);
  91.         }
  92.     }

  93.     /** {@inheritDoc} */
  94.     @Override
  95.     public ObjectStream openStream() throws MissingObjectException, IOException {
  96.         WindowCursor wc = new WindowCursor(db);
  97.         InputStream in;
  98.         try {
  99.             in = new PackInputStream(pack, objectOffset + headerLength, wc);
  100.         } catch (IOException packGone) {
  101.             // If the pack file cannot be pinned into the cursor, it
  102.             // probably was repacked recently. Go find the object
  103.             // again and open the stream from that location instead.
  104.             //
  105.             return wc.open(getObjectId(), type).openStream();
  106.         }

  107.         in = new BufferedInputStream( //
  108.                 new InflaterInputStream( //
  109.                         in, //
  110.                         wc.inflater(), //
  111.                         8192), //
  112.                 8192);
  113.         return new ObjectStream.Filter(type, size, in);
  114.     }

  115.     private ObjectId getObjectId() throws IOException {
  116.         return pack.findObjectForOffset(objectOffset);
  117.     }
  118. }