/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.tools;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
/**
* Information presenting a rename/delete op derived from a snapshot diff entry.
* This includes the source file/dir of the rename/delete op, and the target
* file/dir of a rename op.
*/
class DiffInfo {
static final Comparator<DiffInfo> sourceComparator = new Comparator<DiffInfo>() {
@Override
public int compare(DiffInfo d1, DiffInfo d2) {
return d2.source.compareTo(d1.source);
}
};
static final Comparator<DiffInfo> targetComparator = new Comparator<DiffInfo>() {
@Override
public int compare(DiffInfo d1, DiffInfo d2) {
return d1.target == null ? -1 :
(d2.target == null ? 1 : d1.target.compareTo(d2.target));
}
};
/** The source file/dir of the rename or deletion op */
final Path source;
/**
* The intermediate file/dir for the op. For a rename or a delete op,
* we first rename the source to this tmp file/dir.
*/
private Path tmp;
/** The target file/dir of the rename op. Null means the op is deletion. */
final Path target;
DiffInfo(Path source, Path target) {
assert source != null;
this.source = source;
this.target= target;
}
void setTmp(Path tmp) {
this.tmp = tmp;
}
Path getTmp() {
return tmp;
}
static DiffInfo[] getDiffs(SnapshotDiffReport report, Path targetDir) {
List<DiffInfo> diffs = new ArrayList<>();
for (SnapshotDiffReport.DiffReportEntry entry : report.getDiffList()) {
if (entry.getType() == SnapshotDiffReport.DiffType.DELETE) {
final Path source = new Path(targetDir,
DFSUtil.bytes2String(entry.getSourcePath()));
diffs.add(new DiffInfo(source, null));
} else if (entry.getType() == SnapshotDiffReport.DiffType.RENAME) {
final Path source = new Path(targetDir,
DFSUtil.bytes2String(entry.getSourcePath()));
final Path target = new Path(targetDir,
DFSUtil.bytes2String(entry.getTargetPath()));
diffs.add(new DiffInfo(source, target));
}
}
return diffs.toArray(new DiffInfo[diffs.size()]);
}
}