org.apache.mahout.classifier.df.mapreduce.partial.TreeID.java Source code

Introduction

Here is the source code for org.apache.mahout.classifier.df.mapreduce.partial.TreeID.java

Source

/**
 * 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());
    }
}