io.archivesunleashed.app.WriteGEXF.scala Maven / Gradle / Ivy

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An open-source toolkit for analyzing web archives.

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/*
 * Archives Unleashed Toolkit (AUT):
 * An open-source platform for analyzing web archives.
 *
 * 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 io.archivesunleashed.app

import io.archivesunleashed.matchbox._

import java.nio.charset.StandardCharsets
import java.nio.file.{Files, Paths}

import org.apache.spark.rdd.RDD

/**
  * UDF for exporting an RDD representing a collection of links to a GEXF file.
  */
object WriteGEXF {

  /** Writes graph nodes and edges to file.
   *
   * @param rdd RDD of elements in format ((datestring, source, target), count)
   * @param gexfPath output file
   * @return Unit().
   */
  def apply(rdd: RDD[((String, String, String), Int)], gexfPath: String): Boolean = {
    if (gexfPath.isEmpty()) false
    else makeFile (rdd, gexfPath)
  }

  /** Produces the GEXF output from an RDD of tuples and outputs it to graphmlPath.
   *
   * @param rdd an RDD of elements in format ((datestring, source, target), count)
   * @param gexfPath output file
   * @return true on success.
   */
  def makeFile (rdd: RDD[((String, String, String), Int)], gexfPath: String): Boolean = {
    val outFile = Files.newBufferedWriter(Paths.get(gexfPath), StandardCharsets.UTF_8)
    val edges = rdd.map(r => "\n" +
      "\n" +
      "\n" +
      "\n" +
      "\n").collect
    val nodes = rdd.flatMap(r => List("\n",
      "\n")).distinct.collect
    outFile.write("\n" +
      "\n" +
      "\n" +
      "\n" +
      "  \n" +
      "\n" +
      "\n")
    nodes.foreach(r => outFile.write(r))
    outFile.write("\n\n")
    edges.foreach(r => outFile.write(r))
    outFile.write("\n\n")
    outFile.close()
    return true
  }
}