| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.hyracks.storage.am.common.datagen; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| |
| public class DocumentStringFieldValueGenerator implements IFieldValueGenerator<String> { |
| private final String FIRST_NAMES_FILE = "dist.all.first.cleaned"; |
| private final String LAST_NAMES_FILE = "dist.all.last.cleaned"; |
| |
| private final int docMinWords; |
| private final int docMaxWords; |
| private final int maxDictionarySize; |
| private final Random rnd; |
| private int[] cumulIntRanges; |
| |
| private List<String> tokenDict = new ArrayList<String>(); |
| |
| public DocumentStringFieldValueGenerator(int docMinWords, int docMaxWords, int maxDictionarySize, Random rnd) |
| throws IOException { |
| this.docMinWords = docMinWords; |
| this.docMaxWords = docMaxWords; |
| this.maxDictionarySize = maxDictionarySize; |
| this.rnd = rnd; |
| initDictionary(); |
| double[] zipfProbDist = ProbabilityHelper.getZipfProbDist(tokenDict.size(), 1); |
| cumulIntRanges = ProbabilityHelper.getCumulIntRanges(zipfProbDist); |
| } |
| |
| private void initDictionary() throws IOException { |
| String line; |
| int count = 0; |
| |
| // Read first names from data file. |
| InputStream firstNamesIn = this.getClass().getClassLoader().getResourceAsStream(FIRST_NAMES_FILE); |
| BufferedReader firstNamesReader = new BufferedReader(new InputStreamReader(firstNamesIn)); |
| try { |
| while (count < maxDictionarySize && (line = firstNamesReader.readLine()) != null) { |
| tokenDict.add(line.trim()); |
| count++; |
| } |
| } finally { |
| firstNamesReader.close(); |
| } |
| |
| // Read last names from data file. |
| InputStream lastNamesIn = this.getClass().getClassLoader().getResourceAsStream(LAST_NAMES_FILE); |
| BufferedReader lastNamesReader = new BufferedReader(new InputStreamReader(lastNamesIn)); |
| try { |
| while (count < maxDictionarySize && (line = lastNamesReader.readLine()) != null) { |
| tokenDict.add(line.trim()); |
| count++; |
| } |
| } finally { |
| lastNamesReader.close(); |
| } |
| } |
| |
| @Override |
| public String next() { |
| StringBuilder strBuilder = new StringBuilder(); |
| int numWords = Math.abs(rnd.nextInt()) % (docMaxWords - docMinWords + 1) + docMinWords; |
| for (int i = 0; i < numWords; i++) { |
| int ix = ProbabilityHelper.choose(cumulIntRanges, rnd.nextInt()); |
| strBuilder.append(tokenDict.get(ix)); |
| if (i != numWords - 1) { |
| strBuilder.append(" "); |
| } |
| } |
| return strBuilder.toString(); |
| } |
| |
| public List<String> getTokenDictionary() { |
| return tokenDict; |
| } |
| |
| @Override |
| public void reset() { |
| } |
| } |