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This shortens the implementation within PackWriter, and starts to open the door for some other refactorings based on changing the ObjectToPack to be a public part of the API. Change-Id: Id849cbffc4de20b903e844a2de7737eeb8b7a3ff Signed-off-by: Shawn O. Pearce <spearce@spearce.org>stable-0.9
Shawn O. Pearce
15 years ago
2 changed files with 191 additions and 143 deletions
@ -0,0 +1,191 @@
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/* |
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* Copyright (C) 2008-2010, Google Inc. |
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* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com> |
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* and other copyright owners as documented in the project's IP log. |
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* |
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* This program and the accompanying materials are made available |
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* under the terms of the Eclipse Distribution License v1.0 which |
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* accompanies this distribution, is reproduced below, and is |
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials provided |
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* with the distribution. |
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* |
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* - Neither the name of the Eclipse Foundation, Inc. nor the |
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* names of its contributors may be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package org.eclipse.jgit.lib; |
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import java.io.IOException; |
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import org.eclipse.jgit.transport.PackedObjectInfo; |
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/** |
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* Class holding information about object that is going to be packed by |
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* {@link PackWriter}. Information include object representation in a |
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* pack-file and object status. |
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* |
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*/ |
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class ObjectToPack extends PackedObjectInfo { |
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/** Other object being packed that this will delta against. */ |
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private ObjectId deltaBase; |
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/** Pack to reuse compressed data from, otherwise null. */ |
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private PackFile copyFromPack; |
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/** Offset of the object's header in {@link #copyFromPack}. */ |
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private long copyOffset; |
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/** |
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* Bit field, from bit 0 to bit 31: |
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* <ul> |
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* <li>1 bit: wantWrite</li> |
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* <li>3 bits: type</li> |
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* <li>28 bits: deltaDepth</li> |
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* </ul> |
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*/ |
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private int flags; |
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/** |
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* Construct object for specified object id. <br/> By default object is |
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* marked as not written and non-delta packed (as a whole object). |
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* |
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* @param src |
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* object id of object for packing |
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* @param type |
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* real type code of the object, not its in-pack type. |
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*/ |
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ObjectToPack(AnyObjectId src, final int type) { |
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super(src); |
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flags |= type << 1; |
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} |
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/** |
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* @return delta base object id if object is going to be packed in delta |
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* representation; null otherwise - if going to be packed as a |
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* whole object. |
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*/ |
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ObjectId getDeltaBaseId() { |
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return deltaBase; |
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} |
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/** |
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* @return delta base object to pack if object is going to be packed in |
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* delta representation and delta is specified as object to |
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* pack; null otherwise - if going to be packed as a whole |
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* object or delta base is specified only as id. |
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*/ |
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ObjectToPack getDeltaBase() { |
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if (deltaBase instanceof ObjectToPack) |
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return (ObjectToPack) deltaBase; |
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return null; |
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} |
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/** |
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* Set delta base for the object. Delta base set by this method is used |
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* by {@link PackWriter} to write object - determines its representation |
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* in a created pack. |
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* |
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* @param deltaBase |
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* delta base object or null if object should be packed as a |
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* whole object. |
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* |
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*/ |
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void setDeltaBase(ObjectId deltaBase) { |
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this.deltaBase = deltaBase; |
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} |
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void clearDeltaBase() { |
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this.deltaBase = null; |
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} |
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/** |
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* @return true if object is going to be written as delta; false |
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* otherwise. |
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*/ |
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boolean isDeltaRepresentation() { |
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return deltaBase != null; |
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} |
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/** |
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* Check if object is already written in a pack. This information is |
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* used to achieve delta-base precedence in a pack file. |
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* |
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* @return true if object is already written; false otherwise. |
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*/ |
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boolean isWritten() { |
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return getOffset() != 0; |
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} |
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boolean isCopyable() { |
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return copyFromPack != null; |
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} |
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PackedObjectLoader getCopyLoader(WindowCursor curs) throws IOException { |
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return copyFromPack.resolveBase(curs, copyOffset); |
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} |
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void setCopyFromPack(PackedObjectLoader loader) { |
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this.copyFromPack = loader.pack; |
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this.copyOffset = loader.objectOffset; |
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} |
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void clearSourcePack() { |
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copyFromPack = null; |
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} |
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int getType() { |
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return (flags>>1) & 0x7; |
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} |
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int getDeltaDepth() { |
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return flags >>> 4; |
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} |
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void updateDeltaDepth() { |
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final int d; |
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if (deltaBase instanceof ObjectToPack) |
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d = ((ObjectToPack) deltaBase).getDeltaDepth() + 1; |
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else if (deltaBase != null) |
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d = 1; |
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else |
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d = 0; |
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flags = (d << 4) | flags & 0x15; |
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} |
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boolean wantWrite() { |
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return (flags & 1) == 1; |
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} |
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void markWantWrite() { |
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flags |= 1; |
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} |
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} |
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