com.chinamobile.bcbsp.examples.StringEdge.java Source code

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Here is the source code for com.chinamobile.bcbsp.examples.StringEdge.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 com.chinamobile.bcbsp.examples;

import com.chinamobile.bcbsp.api.Edge;
import com.chinamobile.bcbsp.Constants;

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

import org.apache.hadoop.io.Text;

/**
 * Edge implementation with type of String.
 */
public class StringEdge extends Edge<String, String> {
    /** Init the ID of vertex */
    private String vertexID = null;
    /** Init the edgeValue */
    private String edgeValue = null;

    /**
     * Split the edgeData.
     * @param edgeData complex edge data
     */
    @Override
    public void fromString(String edgeData) throws Exception {
        StringTokenizer str = new StringTokenizer(edgeData, Constants.SPLIT_FLAG);
        if (str.countTokens() != 2) {
            throw new Exception();
        }
        this.vertexID = str.nextToken();
        this.edgeValue = str.nextToken();
    }

    @Override
    public String getEdgeValue() {
        return this.edgeValue;
    }

    @Override
    public String getVertexID() {
        return this.vertexID;
    }

    /**
     * Transform vertexID and edgeValue to string.
     * @return vertexID and edgeValue
     */
    @Override
    public String intoString() {
        return this.vertexID + Constants.SPLIT_FLAG + this.edgeValue;
    }

    @Override
    public void setEdgeValue(String edgeValue) {
        this.edgeValue = edgeValue;
    }

    @Override
    public void setVertexID(String vertexID) {
        this.vertexID = vertexID;
    }

    /**
     * Deserialize vertexID and edgeValue.
     * @param in vertexID or edgeValue
     */
    @Override
    public void readFields(DataInput in) throws IOException {
        this.vertexID = Text.readString(in);
        this.edgeValue = Text.readString(in);
    }

    /**
     * Serialize vertexID and edgeValue.
     * @param out vertexID or edgeValue
     */
    @Override
    public void write(DataOutput out) throws IOException {
        Text.writeString(out, this.vertexID);
        Text.writeString(out, this.edgeValue);
    }

    /**
     * Judge the different edge.
     * @param object the type of edge
     * @return true or false
     */
    @Override
    public boolean equals(Object object) {
        StringEdge edge = (StringEdge) object;
        if (this.vertexID.equals(edge.getVertexID())) {
            return true;
        }
        return false;
        // return this.vertexID.equals(edge.getVertexID()) ? true : false;
    }

    /**
     * Override hashCode().
     * @return vertexID
     */
    @Override
    public int hashCode() {
        return Integer.valueOf(this.vertexID).hashCode();
    }
}