com.google.gerrit.server.edit.tree.RestoreFileModification Maven / Gradle / Ivy
// Copyright (C) 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.edit.tree;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.eclipse.jgit.dircache.DirCacheEditor;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
/**
* A {@code TreeModification} which restores a file. The file is added again if it was present
* before the specified commit or deleted if it was absent.
*/
public class RestoreFileModification implements TreeModification {
private final String filePath;
public RestoreFileModification(String filePath) {
this.filePath = filePath;
}
@Override
public List getPathEdits(
Repository repository, ObjectId treeId, ImmutableList parents)
throws IOException {
if (parents.isEmpty()) {
DirCacheEditor.DeletePath deletePath = new DirCacheEditor.DeletePath(filePath);
return Collections.singletonList(deletePath);
}
try (RevWalk revWalk = new RevWalk(repository)) {
RevCommit base = revWalk.parseCommit(parents.get(0));
try (TreeWalk treeWalk =
TreeWalk.forPath(revWalk.getObjectReader(), filePath, base.getTree())) {
if (treeWalk == null) {
DirCacheEditor.DeletePath deletePath = new DirCacheEditor.DeletePath(filePath);
return Collections.singletonList(deletePath);
}
AddPath addPath = new AddPath(filePath, treeWalk.getFileMode(0), treeWalk.getObjectId(0));
return Collections.singletonList(addPath);
}
}
}
@Override
public ImmutableSet getFilePaths() {
return ImmutableSet.of(filePath);
}
}