| /* |
| * Copyright (C) 2010, 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.lib; |
| |
| import org.eclipse.jgit.annotations.NonNull; |
| import org.eclipse.jgit.annotations.Nullable; |
| |
| /** |
| * A reference that indirectly points at another {@link Ref}. |
| * <p> |
| * A symbolic reference always derives its current value from the target |
| * reference. |
| */ |
| public class SymbolicRef implements Ref { |
| private final String name; |
| |
| private final Ref target; |
| |
| /** |
| * Create a new ref pairing. |
| * |
| * @param refName |
| * name of this ref. |
| * @param target |
| * the ref we reference and derive our value from. |
| */ |
| public SymbolicRef(@NonNull String refName, @NonNull Ref target) { |
| this.name = refName; |
| this.target = target; |
| } |
| |
| @Override |
| @NonNull |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public boolean isSymbolic() { |
| return true; |
| } |
| |
| @Override |
| @NonNull |
| public Ref getLeaf() { |
| Ref dst = getTarget(); |
| while (dst.isSymbolic()) |
| dst = dst.getTarget(); |
| return dst; |
| } |
| |
| @Override |
| @NonNull |
| public Ref getTarget() { |
| return target; |
| } |
| |
| @Override |
| @Nullable |
| public ObjectId getObjectId() { |
| return getLeaf().getObjectId(); |
| } |
| |
| @Override |
| @NonNull |
| public Storage getStorage() { |
| return Storage.LOOSE; |
| } |
| |
| @Override |
| @Nullable |
| public ObjectId getPeeledObjectId() { |
| return getLeaf().getPeeledObjectId(); |
| } |
| |
| @Override |
| public boolean isPeeled() { |
| return getLeaf().isPeeled(); |
| } |
| |
| @SuppressWarnings("nls") |
| @Override |
| public String toString() { |
| StringBuilder r = new StringBuilder(); |
| r.append("SymbolicRef["); |
| Ref cur = this; |
| while (cur.isSymbolic()) { |
| r.append(cur.getName()); |
| r.append(" -> "); |
| cur = cur.getTarget(); |
| } |
| r.append(cur.getName()); |
| r.append('='); |
| r.append(ObjectId.toString(cur.getObjectId())); |
| r.append("]"); |
| return r.toString(); |
| } |
| } |