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package eu.dnetlib.data.mapreduce.hbase.lodExport.utils;
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import org.apache.log4j.Logger;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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public class Blocking {
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private static Logger log = Logger.getLogger(Blocking.class);
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public static List<String> tokenBlocking(String[] record, Map<String, Integer> stopwordsMap) {
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List<String> blockingKeys = new ArrayList<>();
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Map<String, Integer> blockingKeysMap = new HashMap<>();
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String value = null;
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try {
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for (int i = 1; i < record.length; i++) {
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value = record[i].substring(record[i].indexOf("\t") + 1).replaceAll("_", " ");
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String[] tokens = value.toLowerCase().split("[\\W_]");
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for (int j = 0; j < tokens.length; j++) {
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String currentToken = tokens[j];
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if (currentToken.length() > 0 && !stopwordsMap.containsKey(currentToken)) {
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// blockingKeys.add(currentToken);
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if (blockingKeysMap.containsKey(currentToken)) {
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blockingKeysMap.put(currentToken, blockingKeysMap.get(currentToken) + 1);
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} else {
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blockingKeysMap.put(currentToken, 1);
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}
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}
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}
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StringBuilder tokenBuilder = new StringBuilder();
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Iterator<Map.Entry<String, Integer>> mapIterator = blockingKeysMap.entrySet().iterator();
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//throw away frequent words - tokens that occur more than once within a record field
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while (mapIterator.hasNext()) {
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Map.Entry<String, Integer> entry = mapIterator.next();
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/* if (entry.getValue() > 1) {
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log.debug("Removed token : " + entry.getKey() + " with " + entry.getValue() + "occurences");
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blockingKeysMap.remove(entry.getKey());
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}
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*/
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if (entry.getValue() == 1) {
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tokenBuilder.append(entry).append(" ");
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}
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}
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blockingKeys.add(tokenBuilder.toString());
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}
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} catch (Exception e) {
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log.error(e);
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}
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return blockingKeys;
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}
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}
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