org.apache.nutch.scoring.webgraph.LinkDatum.java Source code

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Here is the source code for org.apache.nutch.scoring.webgraph.LinkDatum.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.nutch.scoring.webgraph;

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

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;

/**
 * A class for holding link information including the url, anchor text, a score,
 * the timestamp of the link and a link type.
 */
public class LinkDatum implements Writable {

    public final static byte INLINK = 1;
    public final static byte OUTLINK = 2;

    private String url = null;
    private String anchor = "";
    private float score = 0.0f;
    private long timestamp = 0L;
    private byte linkType = 0;

    /**
     * Default constructor, no url, timestamp, score, or link type.
     */
    public LinkDatum() {

    }

    /**
     * Creates a LinkDatum with a given url. Timestamp is set to current time.
     * 
     * @param url The link url.
     */
    public LinkDatum(String url) {
        this(url, "", System.currentTimeMillis());
    }

    /**
     * Creates a LinkDatum with a url and an anchor text. Timestamp is set to
     * current time.
     * 
     * @param url The link url.
     * @param anchor The link anchor text.
     */
    public LinkDatum(String url, String anchor) {
        this(url, anchor, System.currentTimeMillis());
    }

    public LinkDatum(String url, String anchor, long timestamp) {
        this.url = url;
        this.anchor = anchor;
        this.timestamp = timestamp;
    }

    public String getUrl() {
        return url;
    }

    public String getAnchor() {
        return anchor;
    }

    public void setAnchor(String anchor) {
        this.anchor = anchor;
    }

    public float getScore() {
        return score;
    }

    public void setScore(float score) {
        this.score = score;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public byte getLinkType() {
        return linkType;
    }

    public void setLinkType(byte linkType) {
        this.linkType = linkType;
    }

    public void readFields(DataInput in) throws IOException {
        url = Text.readString(in);
        anchor = Text.readString(in);
        score = in.readFloat();
        timestamp = in.readLong();
        linkType = in.readByte();
    }

    public void write(DataOutput out) throws IOException {
        Text.writeString(out, url);
        Text.writeString(out, anchor != null ? anchor : "");
        out.writeFloat(score);
        out.writeLong(timestamp);
        out.writeByte(linkType);
    }

    public String toString() {

        String type = (linkType == INLINK ? "inlink" : (linkType == OUTLINK) ? "outlink" : "unknown");
        return "url: " + url + ", anchor: " + anchor + ", score: " + score + ", timestamp: " + timestamp
                + ", link type: " + type;
    }
}