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The WindowCache is an implementation detail of PackFile and how its used by ObjectDirectory. Lets start to hide it and replace the public API with a more generic concept, ObjectReader. Because PackedObjectLoader is also considered a private detail of PackFile, we have to make PackWriter temporarily dependent upon the WindowCursor and thus FileRepository and ObjectDirectory in order to just start the refactoring. In later changes we will clean up the APIs more, exposing sufficient support to PackWriter without needing the file specific implementation details. Change-Id: I676be12b57f3534f1285854ee5de1aa483895398 Signed-off-by: Shawn O. Pearce <spearce@spearce.org>stable-0.9
Shawn O. Pearce
14 years ago
20 changed files with 274 additions and 157 deletions
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/* |
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* Copyright (C) 2010, Google Inc. |
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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.errors.MissingObjectException; |
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/** Reads an {@link ObjectDatabase} for a single thread. */ |
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public abstract class ObjectReader { |
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/** Type hint indicating the caller doesn't know the type. */ |
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protected static final int OBJ_ANY = -1; |
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/** |
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* Does the requested object exist in this database? |
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* |
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* @param objectId |
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* identity of the object to test for existence of. |
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* @return true if the specified object is stored in this database. |
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* @throws IOException |
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* the object store cannot be accessed. |
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*/ |
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public boolean hasObject(AnyObjectId objectId) throws IOException { |
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try { |
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openObject(objectId); |
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return true; |
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} catch (MissingObjectException notFound) { |
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return false; |
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} |
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} |
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/** |
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* Open an object from this database. |
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* |
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* @param objectId |
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* identity of the object to open. |
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* @return a {@link ObjectLoader} for accessing the object. |
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* @throws MissingObjectException |
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* the object does not exist. |
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* @throws IOException |
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*/ |
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public ObjectLoader openObject(AnyObjectId objectId) |
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throws MissingObjectException, IOException { |
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return openObject(objectId, OBJ_ANY); |
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} |
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/** |
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* Open an object from this database. |
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* |
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* @param objectId |
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* identity of the object to open. |
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*@param typeHint |
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* hint about the type of object being requested; |
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* {@link #OBJ_ANY} if the object type is not known, or does not |
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* matter to the caller. |
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* @return a {@link ObjectLoader} for accessing the object. |
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* @throws MissingObjectException |
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* the object does not exist. |
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* @throws IOException |
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*/ |
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public abstract ObjectLoader openObject(AnyObjectId objectId, int typeHint) |
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throws MissingObjectException, IOException; |
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/** |
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* Release any resources used by this reader. |
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* <p> |
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* A reader that has been released can be used again, but may need to be |
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* released after the subsequent usage. |
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*/ |
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public void release() { |
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// Do nothing.
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} |
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} |
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