Shawn Pearce
9 years ago
committed by
Gerrit Code Review @ Eclipse.org
4 changed files with 197 additions and 33 deletions
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/* |
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* Copyright (C) 2016, 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.internal.storage.reftree; |
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import static org.eclipse.jgit.lib.RefDatabase.ALL; |
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import java.io.IOException; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.List; |
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import org.eclipse.jgit.lib.Ref; |
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import org.eclipse.jgit.lib.RefDatabase; |
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/** Magic reference name logic for RefTrees. */ |
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public class RefTreeNames { |
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/** |
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* Suffix used on a {@link RefTreeDatabase#getTxnNamespace()} for user data. |
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* <p> |
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* A {@link RefTreeDatabase}'s namespace may include a subspace (e.g. |
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* {@code "refs/txn/stage/"}) containing commit objects from the usual user |
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* portion of the repository (e.g. {@code "refs/heads/"}). These should be |
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* packed by the garbage collector alongside other user content rather than |
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* with the RefTree. |
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*/ |
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private static final String STAGE = "stage/"; //$NON-NLS-1$
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/** |
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* Determine if the reference is likely to be a RefTree. |
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* |
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* @param refdb |
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* database instance. |
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* @param ref |
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* reference name. |
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* @return {@code true} if the reference is a RefTree. |
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*/ |
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public static boolean isRefTree(RefDatabase refdb, String ref) { |
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if (refdb instanceof RefTreeDatabase) { |
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RefTreeDatabase b = (RefTreeDatabase) refdb; |
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if (ref.equals(b.getTxnCommitted())) { |
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return true; |
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} |
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String namespace = b.getTxnNamespace(); |
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if (namespace != null |
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&& ref.startsWith(namespace) |
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&& !ref.startsWith(namespace + STAGE)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Snapshot all references from a RefTreeDatabase and its bootstrap. |
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* <p> |
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* There may be name conflicts with multiple {@link Ref} objects containing |
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* the same name in the returned collection. |
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* |
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* @param refdb |
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* database instance. |
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* @return all known references. |
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* @throws IOException |
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* references cannot be enumerated. |
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*/ |
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public static Collection<Ref> allRefs(RefDatabase refdb) |
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throws IOException { |
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Collection<Ref> refs = refdb.getRefs(ALL).values(); |
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if (!(refdb instanceof RefTreeDatabase)) { |
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return refs; |
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} |
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RefDatabase bootstrap = ((RefTreeDatabase) refdb).getBootstrap(); |
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Collection<Ref> br = bootstrap.getRefs(ALL).values(); |
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List<Ref> all = new ArrayList<>(refs.size() + br.size()); |
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all.addAll(refs); |
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all.addAll(br); |
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return all; |
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} |
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private RefTreeNames() { |
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} |
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} |
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