org.apache.mahout.graph.model.Vertex.java Source code

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Here is the source code for org.apache.mahout.graph.model.Vertex.java

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/**
 * 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.graph.model;

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

import com.google.common.primitives.Longs;
import org.apache.hadoop.io.WritableComparable;

/** models a vertex in a graph */
public class Vertex implements WritableComparable<Vertex>, Cloneable {

    private long id;

    public Vertex() {
    }

    public Vertex(long id) {
        this.id = id;
    }

    public static Vertex read(DataInput in) throws IOException {
        Vertex v = new Vertex();
        v.readFields(in);
        return v;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        this.id = in.readLong();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeLong(id);
    }

    public long getId() {
        return this.id;
    }

    /** Compares this instance to another according to the {@code id} attribute. */
    @Override
    public int compareTo(Vertex other) {
        return Longs.compare(id, other.id);
    }

    /** Compares this instance to another according to the {@code id} attribute */
    @Override
    public boolean equals(Object other) {
        if (other instanceof Vertex) {
            return ((Vertex) other).id == id;
        }
        return false;
    }

    @Override
    public Vertex clone() {
        return new Vertex(id);
    }

    /**
     * The hash code the {@code id} attribute
     */
    @Override
    public int hashCode() {
        return Longs.hashCode(id);
    }

    @Override
    public String toString() {
        return "(" + id + ')';
    }

}