/**
* 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 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 VectorOrPrefWritable implements Writable {
private Vector vector;
private long userID;
private float value;
public VectorOrPrefWritable() {
}
public VectorOrPrefWritable(Vector vector) {
this.vector = vector;
}
public VectorOrPrefWritable(long userID, float value) {
this.userID = userID;
this.value = value;
}
public Vector getVector() {
return vector;
}
public long getUserID() {
return userID;
}
public float getValue() {
return value;
}
public void set(Vector vector) {
this.vector = vector;
this.userID = Long.MIN_VALUE;
this.value = Float.NaN;
}
public void set(long userID, float value) {
this.vector = null;
this.userID = userID;
this.value = value;
}
@Override
public void write(DataOutput out) throws IOException {
if (vector == null) {
out.writeBoolean(false);
Varint.writeSignedVarLong(userID, out);
out.writeFloat(value);
} else {
out.writeBoolean(true);
VectorWritable vw = new VectorWritable(vector);
vw.setWritesLaxPrecision(true);
vw.write(out);
}
}
@Override
public void readFields(DataInput in) throws IOException {
boolean hasVector = in.readBoolean();
if (hasVector) {
VectorWritable writable = new VectorWritable();
writable.readFields(in);
set(writable.get());
} else {
long theUserID = Varint.readSignedVarLong(in);
float theValue = in.readFloat();
set(theUserID, theValue);
}
}
@Override
public String toString() {
return vector == null ? userID + ":" + value : vector.toString();
}
}