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/*
* Copyright (C) 2009, Google Inc.
* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
* Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.lib;
import java.io.IOException;
/**
* Base class for a set of object loader classes for packed objects.
*/
abstract class PackedObjectLoader extends ObjectLoader {
protected final PackFile pack;
/** Position of the first byte of the object's header. */
protected final long objectOffset;
/** Bytes used to express the object header, including delta reference. */
protected final int headerSize;
protected int objectType;
protected int objectSize;
protected byte[] cachedBytes;
PackedObjectLoader(final PackFile pr, final long objectOffset,
final int headerSize) {
pack = pr;
this.objectOffset = objectOffset;
this.headerSize = headerSize;
}
/**
* Force this object to be loaded into memory and pinned in this loader.
* <p>
* Once materialized, subsequent get operations for the following methods
* will always succeed without raising an exception, as all information is
* pinned in memory by this loader instance.
* <ul>
* <li>{@link #getType()}</li>
* <li>{@link #getSize()}</li>
* <li>{@link #getBytes()}, {@link #getCachedBytes}</li>
* <li>{@link #getRawSize()}</li>
* <li>{@link #getRawType()}</li>
* </ul>
*
* @param curs
* temporary thread storage during data access.
* @throws IOException
* the object cannot be read.
*/
public abstract void materialize(WindowCursor curs) throws IOException;
public final int getType() {
return objectType;
}
public final long getSize() {
return objectSize;
}
@Override
public final byte[] getCachedBytes() {
return cachedBytes;
}
/**
* @return offset of object header within pack file
*/
public final long getObjectOffset() {
return objectOffset;
}
/**
* @return id of delta base object for this object representation. null if
* object is not stored as delta.
* @throws IOException
* when delta base cannot read.
*/
public abstract ObjectId getDeltaBase() throws IOException;
}
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