org.apache.nutch.crawl.SeedGenerator.java Source code

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Here is the source code for org.apache.nutch.crawl.SeedGenerator.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
 * 
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package org.apache.nutch.crawl;

import java.io.File;
import java.util.ArrayList;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.nutch.util.NetUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;

/**
 * TODO : more generic seed generator
 * */
public class SeedGenerator {

    public static final Logger LOG = LoggerFactory.getLogger(SeedGenerator.class);

    public static void main(String[] args) throws Exception {
        String urlFormat = "http://oumen.com/detail.php?atid={{{1000,4460}}}";
        String[] urlParts = urlFormat.split("\\{\\{\\{\\d+\\,\\d+\\}\\}\\}");
        String[] placeholders = StringUtils.substringsBetween(urlFormat, "{{{", "}}}");

        ArrayList<ArrayList<Integer>> ranges = Lists.newArrayList();
        for (int i = 0; i < placeholders.length; ++i) {
            int min = Integer.parseInt(StringUtils.substringBefore(placeholders[i], ","));
            int max = Integer.parseInt(StringUtils.substringAfter(placeholders[i], ","));

            ranges.add(Lists.newArrayList(min, max));
        }

        // we can support only one placeholder right now

        StringBuilder content = new StringBuilder();
        for (int i = ranges.get(0).get(0); i <= ranges.get(0).get(1); ++i) {
            String url = urlParts[0] + i;
            if (urlParts.length > 1) {
                url += urlParts[1];
            }

            content.append(url);
            content.append("\n");
        }

        String tidyDomain = NetUtil.getTopLevelDomain(urlFormat);
        String file = StringUtils.substringBefore(tidyDomain, ".").toLowerCase().replaceAll("[^a-z]", "_");

        file = "/tmp/" + file + ".txt";
        FileUtils.writeStringToFile(new File(file), content.toString(), "utf-8");

        System.out.println("url seed results are saved in : " + file);
    }
}