org.apache.mahout.classifier.df.mapreduce.partial.TreeID Maven / Gradle / Ivy
/**
* 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.mahout.classifier.df.mapreduce.partial;
import com.google.common.base.Preconditions;
import org.apache.hadoop.io.LongWritable;
/**
* Indicates both the tree and the data partition used to grow the tree
*/
public class TreeID extends LongWritable implements Cloneable {
public static final int MAX_TREEID = 100000;
public TreeID() { }
public TreeID(int partition, int treeId) {
Preconditions.checkArgument(partition >= 0, "Wrong partition: " + partition + ". Partition must be >= 0!");
Preconditions.checkArgument(treeId >= 0, "Wrong treeId: " + treeId + ". TreeId must be >= 0!");
set(partition, treeId);
}
public void set(int partition, int treeId) {
set((long) partition * MAX_TREEID + treeId);
}
/**
* Data partition (InputSplit's index) that was used to grow the tree
*/
public int partition() {
return (int) (get() / MAX_TREEID);
}
public int treeId() {
return (int) (get() % MAX_TREEID);
}
@Override
public TreeID clone() {
return new TreeID(partition(), treeId());
}
}