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Diffstat (limited to 'org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftree/RefTreeNames.java')
| -rw-r--r-- | org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftree/RefTreeNames.java | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftree/RefTreeNames.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftree/RefTreeNames.java new file mode 100644 index 0000000000..239a745277 --- /dev/null +++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftree/RefTreeNames.java @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2016, Google Inc. + * 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.internal.storage.reftree; + +import static org.eclipse.jgit.lib.RefDatabase.ALL; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; + +import org.eclipse.jgit.lib.Ref; +import org.eclipse.jgit.lib.RefDatabase; + +/** Magic reference name logic for RefTrees. */ +public class RefTreeNames { + /** + * Suffix used on a {@link RefTreeDatabase#getTxnNamespace()} for user data. + * <p> + * A {@link RefTreeDatabase}'s namespace may include a subspace (e.g. + * {@code "refs/txn/stage/"}) containing commit objects from the usual user + * portion of the repository (e.g. {@code "refs/heads/"}). These should be + * packed by the garbage collector alongside other user content rather than + * with the RefTree. + */ + private static final String STAGE = "stage/"; //$NON-NLS-1$ + + /** + * Determine if the reference is likely to be a RefTree. + * + * @param refdb + * database instance. + * @param ref + * reference name. + * @return {@code true} if the reference is a RefTree. + */ + public static boolean isRefTree(RefDatabase refdb, String ref) { + if (refdb instanceof RefTreeDatabase) { + RefTreeDatabase b = (RefTreeDatabase) refdb; + if (ref.equals(b.getTxnCommitted())) { + return true; + } + + String namespace = b.getTxnNamespace(); + if (namespace != null + && ref.startsWith(namespace) + && !ref.startsWith(namespace + STAGE)) { + return true; + } + } + return false; + } + + /** + * Snapshot all references from a RefTreeDatabase and its bootstrap. + * <p> + * There may be name conflicts with multiple {@link Ref} objects containing + * the same name in the returned collection. + * + * @param refdb + * database instance. + * @return all known references. + * @throws IOException + * references cannot be enumerated. + */ + public static Collection<Ref> allRefs(RefDatabase refdb) + throws IOException { + Collection<Ref> refs = refdb.getRefs(ALL).values(); + if (!(refdb instanceof RefTreeDatabase)) { + return refs; + } + + RefDatabase bootstrap = ((RefTreeDatabase) refdb).getBootstrap(); + Collection<Ref> br = bootstrap.getRefs(ALL).values(); + List<Ref> all = new ArrayList<>(refs.size() + br.size()); + all.addAll(refs); + all.addAll(br); + return all; + } + + private RefTreeNames() { + } +} |