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/*
* 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.
*/
/**
* Class defines a single partition corresponding to a directory in a DFS table.
*/
package org.apache.drill.exec.planner;
import org.apache.drill.exec.util.DrillFileSystemUtil;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
import org.apache.hadoop.fs.Path;
import java.util.Collection;
import java.util.List;
/**
* Composite partition location corresponds to a directory in the file system.
* */
public class DFSDirPartitionLocation implements PartitionLocation {
// Similar to directory / file structures, subPartitions could be either a DFSDirPartitionLocation or DFSFilePartitionLocation
private final Collection<PartitionLocation> subPartitions;
private final String[] dirs;
public DFSDirPartitionLocation(String[] dirs, Collection<PartitionLocation> subPartitions) {
this.subPartitions = subPartitions;
this.dirs = dirs;
}
@Override
public String getPartitionValue(int index) {
assert index < dirs.length;
return dirs[index];
}
@Override
public Path getEntirePartitionLocation() {
throw new UnsupportedOperationException("Should not call getEntirePartitionLocation for composite partition location!");
}
@Override
public List<SimplePartitionLocation> getPartitionLocationRecursive() {
List<SimplePartitionLocation> results = Lists.newArrayList();
for (final PartitionLocation partitionLocation : subPartitions) {
results.addAll(partitionLocation.getPartitionLocationRecursive());
}
return results;
}
@Override
public boolean isCompositePartition() {
return true;
}
@Override
public Path getCompositePartitionPath() {
StringBuilder path = new StringBuilder();
for (String dir : dirs) {
if (dir == null) { // get the prefix
break;
}
path.append("/")
.append(dir);
}
return DrillFileSystemUtil.createPathSafe(path.toString());
}
}
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