/*
* 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.cf.taste.hadoop.item;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.io.Writable;
import org.apache.mahout.math.Varint;
import org.apache.mahout.math.Vector;
import org.apache.mahout.math.VectorWritable;
public final class VectorAndPrefsWritable implements Writable {
private Vector vector;
private List<Long> userIDs;
private List<Float> values;
public VectorAndPrefsWritable() {
}
public VectorAndPrefsWritable(Vector vector, List<Long> userIDs, List<Float> values) {
set(vector, userIDs, values);
}
public void set(Vector vector, List<Long> userIDs, List<Float> values) {
this.vector = vector;
this.userIDs = userIDs;
this.values = values;
}
public Vector getVector() {
return vector;
}
public List<Long> getUserIDs() {
return userIDs;
}
public List<Float> getValues() {
return values;
}
@Override
public void write(DataOutput out) throws IOException {
VectorWritable vw = new VectorWritable(vector);
vw.setWritesLaxPrecision(true);
vw.write(out);
Varint.writeUnsignedVarInt(userIDs.size(), out);
for (int i = 0; i < userIDs.size(); i++) {
Varint.writeSignedVarLong(userIDs.get(i), out);
out.writeFloat(values.get(i));
}
}
@Override
public void readFields(DataInput in) throws IOException {
VectorWritable writable = new VectorWritable();
writable.readFields(in);
vector = writable.get();
int size = Varint.readUnsignedVarInt(in);
userIDs = new ArrayList<>(size);
values = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
userIDs.add(Varint.readSignedVarLong(in));
values.add(in.readFloat());
}
}
@Override
public String toString() {
return vector + "\t" + userIDs + '\t' + values;
}
}