net.myrrix.common.SimpleRecommendedItem.java Source code

Introduction

Here is the source code for net.myrrix.common.SimpleRecommendedItem.java

Source

/*
 * Copyright Myrrix Ltd
 *
 * Licensed 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 net.myrrix.common;

import com.google.common.primitives.Floats;
import com.google.common.primitives.Longs;
import org.apache.mahout.cf.taste.recommender.RecommendedItem;

/**
 * Simple and complete implementation of {@link RecommendedItem} which can be compared with itself.
 *
 * @author Sean Owen
 * @since 1.0
 */
public final class SimpleRecommendedItem implements RecommendedItem, Comparable<SimpleRecommendedItem> {

    private final long itemID;
    private final float value;

    public SimpleRecommendedItem(long itemID, float value) {
        this.itemID = itemID;
        this.value = value;
    }

    @Override
    public long getItemID() {
        return itemID;
    }

    @Override
    public float getValue() {
        return value;
    }

    @Override
    public int hashCode() {
        return Longs.hashCode(itemID) ^ Floats.hashCode(value);
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof SimpleRecommendedItem)) {
            return false;
        }
        SimpleRecommendedItem other = (SimpleRecommendedItem) o;
        return other.itemID == itemID && other.value == value;
    }

    @Override
    public String toString() {
        return itemID + ":" + value;
    }

    @Override
    public int compareTo(SimpleRecommendedItem other) {
        return Float.compare(other.value, value);
    }

}