at.illecker.hama.hybrid.examples.kmeans.CenterMessage.java Source code

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Here is the source code for at.illecker.hama.hybrid.examples.kmeans.CenterMessage.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 at.illecker.hama.hybrid.examples.kmeans;

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

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hama.commons.math.DenseDoubleVector;
import org.apache.hama.commons.math.DoubleVector;

public final class CenterMessage implements Writable {

    private int centerIndex;
    private DoubleVector newCenter;
    private int incrementCounter;

    public CenterMessage() {
    }

    public CenterMessage(int key, DoubleVector value) {
        this.centerIndex = key;
        this.newCenter = value;
    }

    public CenterMessage(int key, int increment, DoubleVector value) {
        this.centerIndex = key;
        this.incrementCounter = increment;
        this.newCenter = value;
    }

    @Override
    public final void readFields(DataInput in) throws IOException {
        String str = Text.readString(in);
        String[] values = str.split(":", 3);

        centerIndex = Integer.parseInt(values[0]);
        incrementCounter = Integer.parseInt(values[1]);

        String[] vectorStr = values[2].split(",");
        int len = vectorStr.length;
        DoubleVector vector = new DenseDoubleVector(len);
        for (int i = 0; i < len; i++) {
            vector.set(i, Double.parseDouble(vectorStr[i]));
        }
        newCenter = vector;
    }

    @Override
    public final void write(DataOutput out) throws IOException {
        String str = centerIndex + ":" + incrementCounter + ":";
        for (int i = 0; i < newCenter.getLength(); i++) {
            str += (i < newCenter.getLength() - 1) ? newCenter.get(i) + ", " : newCenter.get(i);
        }
        Text.writeString(out, str);
    }

    public int getCenterIndex() {
        return centerIndex;
    }

    public int getIncrementCounter() {
        return incrementCounter;
    }

    public final DoubleVector getData() {
        return newCenter;
    }

}