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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.
*/
package org.apache.mahout.classifier.df.mapreduce;
import com.google.common.base.Preconditions;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.mahout.classifier.df.builder.TreeBuilder;
import org.apache.mahout.classifier.df.data.Dataset;
import java.io.IOException;
/**
* Base class for Mapred mappers. Loads common parameters from the job
*/
@Deprecated
public class MapredMapper extends Mapper {
private boolean noOutput;
private TreeBuilder treeBuilder;
private Dataset dataset;
/**
*
* @return whether the mapper does estimate and output predictions
*/
protected boolean isOutput() {
return !noOutput;
}
protected TreeBuilder getTreeBuilder() {
return treeBuilder;
}
protected Dataset getDataset() {
return dataset;
}
@Override
protected void setup(Context context) throws IOException, InterruptedException {
super.setup(context);
Configuration conf = context.getConfiguration();
configure(!Builder.isOutput(conf), Builder.getTreeBuilder(conf), Builder
.loadDataset(conf));
}
/**
* Useful for testing
*/
protected void configure(boolean noOutput, TreeBuilder treeBuilder, Dataset dataset) {
Preconditions.checkArgument(treeBuilder != null, "TreeBuilder not found in the Job parameters");
this.noOutput = noOutput;
this.treeBuilder = treeBuilder;
this.dataset = dataset;
}
}
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