at.illecker.hama.hybrid.examples.onlinecf.ItemMessage.java Source code

Introduction

Here is the source code for at.illecker.hama.hybrid.examples.onlinecf.ItemMessage.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 at.illecker.hama.hybrid.examples.onlinecf;

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

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

public final class ItemMessage extends VectorWritable {
    public final static String VALUE_DELIMITER = ",";
    private int senderId;
    private long itemId;

    public ItemMessage() {
        super();
    }

    public ItemMessage(int senderId, long itemId, VectorWritable vector) {
        super(vector);
        this.senderId = senderId;
        this.itemId = itemId;
    }

    public ItemMessage(int senderId, long itemId, DoubleVector vector) {
        super(vector);
        this.senderId = senderId;
        this.itemId = itemId;
    }

    public int getSenderId() {
        return this.senderId;
    }

    public void setSenderId(int senderId) {
        this.senderId = senderId;
    }

    public long getItemId() {
        return this.itemId;
    }

    public void setItemId(long itemId) {
        this.itemId = itemId;
    }

    @Override
    public final void write(DataOutput out) throws IOException {
        writeItemMessage(this, out);
    }

    @Override
    public final void readFields(DataInput in) throws IOException {
        ItemMessage itemMessage = readItemMessage(in);
        super.set(itemMessage.getVector());
        this.senderId = itemMessage.getSenderId();
        this.itemId = itemMessage.getItemId();
    }

    public static void writeItemMessage(ItemMessage itemMessage, DataOutput out) throws IOException {
        String str = itemMessage.senderId + VALUE_DELIMITER + itemMessage.itemId + VALUE_DELIMITER;
        DoubleVector vector = itemMessage.getVector();
        for (int i = 0; i < vector.getLength(); i++) {
            str += (i < vector.getLength() - 1) ? vector.get(i) + VALUE_DELIMITER : vector.get(i);
        }
        Text.writeString(out, str);
    }

    public static ItemMessage readItemMessage(DataInput in) throws IOException {
        String str = Text.readString(in);
        String[] values = str.split(VALUE_DELIMITER);
        int senderId = Integer.parseInt(values[0]);
        long itemId = Long.parseLong(values[1]);

        DoubleVector vector = new DenseDoubleVector(values.length - 2);
        for (int i = 0; i < values.length - 2; i++) {
            vector.set(i, Double.parseDouble(values[i + 2]));
        }
        return new ItemMessage(senderId, itemId, vector);
    }
}