org.apache.mahout.cf.taste.hadoop.EntityPrefWritable Maven / Gradle / Ivy
/*
* 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;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.math.VarLongWritable;
/** A {@link org.apache.hadoop.io.Writable} encapsulating an item ID and a preference value. */
public final class EntityPrefWritable extends VarLongWritable implements Cloneable {
private float prefValue;
public EntityPrefWritable() {
// do nothing
}
public EntityPrefWritable(long itemID, float prefValue) {
super(itemID);
this.prefValue = prefValue;
}
public EntityPrefWritable(EntityPrefWritable other) {
this(other.get(), other.getPrefValue());
}
public long getID() {
return get();
}
public float getPrefValue() {
return prefValue;
}
@Override
public void write(DataOutput out) throws IOException {
super.write(out);
out.writeFloat(prefValue);
}
@Override
public void readFields(DataInput in) throws IOException {
super.readFields(in);
prefValue = in.readFloat();
}
@Override
public int hashCode() {
return super.hashCode() ^ RandomUtils.hashFloat(prefValue);
}
@Override
public boolean equals(Object o) {
if (!(o instanceof EntityPrefWritable)) {
return false;
}
EntityPrefWritable other = (EntityPrefWritable) o;
return get() == other.get() && prefValue == other.getPrefValue();
}
@Override
public String toString() {
return get() + "\t" + prefValue;
}
@Override
public EntityPrefWritable clone() {
return new EntityPrefWritable(get(), prefValue);
}
}