/*
* Copyright (c) 2013 LDBC
* Linked Data Benchmark Council (http://ldbc.eu)
*
* This file is part of ldbc_socialnet_dbgen.
*
* ldbc_socialnet_dbgen is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ldbc_socialnet_dbgen is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ldbc_socialnet_dbgen. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2011 OpenLink Software <bdsmt@openlinksw.com>
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; only Version 2 of the License dated
* June 1991.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package ldbc.snb.datagen.dictionary;
import ldbc.snb.datagen.generator.DatagenParams;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Random;
/**
* This class reads the file containing the email domain and its popularity and
* provides access methods to get such data.
*/
public class EmailDictionary {
private static final String SEPARATOR = " ";
private ArrayList<String> emails;
private ArrayList<Double> cumulativeDistribution;
/**
* @brief Constructor.
*/
public EmailDictionary() {
load(DatagenParams.emailDictionaryFile);
}
/**
* @param fileName The dictionary file name to load.
* @brief Loads the dictionary file.
*/
private void load(String fileName) {
try {
BufferedReader emailDictionary = new BufferedReader(
new InputStreamReader(getClass().getResourceAsStream(fileName), "UTF-8"));
emails = new ArrayList<String>();
cumulativeDistribution = new ArrayList<Double>();
String line;
double cummulativeDist = 0.0;
while ((line = emailDictionary.readLine()) != null) {
String data[] = line.split(SEPARATOR);
emails.add(data[0]);
if (data.length == 2) {
cummulativeDist += Double.parseDouble(data[1]);
cumulativeDistribution.add(cummulativeDist);
}
}
emailDictionary.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Gets a random email domain based on its popularity.
*/
public String getRandomEmail(Random randomTop, Random randomEmail) {
int minIdx = 0;
int maxIdx = cumulativeDistribution.size() - 1;
double prob = randomTop.nextDouble();
if (prob > cumulativeDistribution.get(maxIdx)) {
int Idx = randomEmail.nextInt(emails.size() - cumulativeDistribution.size()) + cumulativeDistribution.size();
return emails.get(Idx);
} else if (prob < cumulativeDistribution.get(minIdx)) {
return emails.get(minIdx);
}
while ((maxIdx - minIdx) > 1) {
int middlePoint = minIdx + (maxIdx - minIdx) / 2;
if (prob > cumulativeDistribution.get(middlePoint)) {
minIdx = middlePoint;
} else {
maxIdx = middlePoint;
}
}
return emails.get(maxIdx);
}
}