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- /*
- * Copyright (C) 2016, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.internal.storage.reftree;
-
- 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;
- }
-
- private RefTreeNames() {
- }
- }
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