org.gpfvic.mahout.cf.taste.hadoop.item.PrefAndSimilarityColumnWritable.java Source code

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Here is the source code for org.gpfvic.mahout.cf.taste.hadoop.item.PrefAndSimilarityColumnWritable.java

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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.gpfvic.mahout.cf.taste.hadoop.item;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.io.Writable;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.math.Vector;
import org.apache.mahout.math.VectorWritable;

public final class PrefAndSimilarityColumnWritable implements Writable {

    private float prefValue;
    private Vector similarityColumn;

    public PrefAndSimilarityColumnWritable() {
    }

    public PrefAndSimilarityColumnWritable(float prefValue, Vector similarityColumn) {
        set(prefValue, similarityColumn);
    }

    public void set(float prefValue, Vector similarityColumn) {
        this.prefValue = prefValue;
        this.similarityColumn = similarityColumn;
    }

    public float getPrefValue() {
        return prefValue;
    }

    public Vector getSimilarityColumn() {
        return similarityColumn;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        prefValue = in.readFloat();
        VectorWritable vw = new VectorWritable();
        vw.readFields(in);
        similarityColumn = vw.get();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeFloat(prefValue);
        VectorWritable vw = new VectorWritable(similarityColumn);
        vw.setWritesLaxPrecision(true);
        vw.write(out);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof PrefAndSimilarityColumnWritable) {
            PrefAndSimilarityColumnWritable other = (PrefAndSimilarityColumnWritable) obj;
            return prefValue == other.prefValue && similarityColumn.equals(other.similarityColumn);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return RandomUtils.hashFloat(prefValue) + 31 * similarityColumn.hashCode();
    }

}