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/*
* 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();
}
}
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