2021-01-30 22:14:48 +01:00
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package it.cavallium.dbengine.lucene.serializer;
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2020-12-07 22:15:18 +01:00
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2021-02-03 13:48:30 +01:00
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import static it.cavallium.dbengine.lucene.serializer.QueryParser.USE_PHRASE_QUERY;
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2021-02-12 19:39:02 +01:00
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import static it.cavallium.dbengine.lucene.serializer.QueryParser.USE_QUERY_BUILDER;
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2021-02-03 13:48:30 +01:00
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2021-02-04 22:42:57 +01:00
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import it.cavallium.dbengine.lucene.LuceneUtils;
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import it.cavallium.dbengine.lucene.analyzer.TextFieldsAnalyzer;
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2021-02-03 13:48:30 +01:00
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import java.io.IOException;
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import java.io.StringReader;
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import java.util.LinkedList;
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import java.util.List;
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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.analysis.TokenStream;
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import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
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import org.apache.lucene.analysis.tokenattributes.TermToBytesRefAttribute;
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import org.apache.lucene.index.Term;
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2021-02-12 19:39:02 +01:00
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import org.apache.lucene.util.QueryBuilder;
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2021-02-03 13:48:30 +01:00
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2020-12-07 22:15:18 +01:00
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public interface Query extends SerializedQueryObject {
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2021-02-12 19:39:02 +01:00
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static Query approximateSearch(TextFieldsAnalyzer preferredAnalyzer, String field, String text) {
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if (USE_QUERY_BUILDER) {
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var qb = new QueryBuilder(LuceneUtils.getAnalyzer(preferredAnalyzer));
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var luceneQuery = qb.createMinShouldMatchQuery(field, text, 0.75f);
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org.apache.lucene.search.SynonymQuery synonymQuery = (org.apache.lucene.search.SynonymQuery) luceneQuery;
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return new SynonymQuery(field,
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synonymQuery.getTerms().stream().map(TermQuery::new).toArray(TermQuery[]::new)
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);
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}
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2021-02-03 13:48:30 +01:00
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try {
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2021-02-12 19:39:02 +01:00
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var terms = getTerms(preferredAnalyzer, field, text);
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2021-02-03 13:48:30 +01:00
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List<BooleanQueryPart> booleanQueryParts = new LinkedList<>();
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for (TermPosition term : terms) {
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booleanQueryParts.add(new BooleanQueryPart(new TermQuery(term.getTerm()), Occur.MUST));
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booleanQueryParts.add(new BooleanQueryPart(new PhraseQuery(terms.toArray(TermPosition[]::new)), Occur.SHOULD));
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}
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return new BooleanQuery(booleanQueryParts);
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} catch (IOException e) {
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e.printStackTrace();
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return exactSearch(preferredAnalyzer, field, text);
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2021-02-03 13:48:30 +01:00
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}
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}
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2021-02-12 19:39:02 +01:00
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static Query exactSearch(TextFieldsAnalyzer preferredAnalyzer, String field, String text) {
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if (USE_QUERY_BUILDER) {
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var qb = new QueryBuilder(LuceneUtils.getAnalyzer(preferredAnalyzer));
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var luceneQuery = qb.createPhraseQuery(field, text);
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org.apache.lucene.search.SynonymQuery synonymQuery = (org.apache.lucene.search.SynonymQuery) luceneQuery;
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return new SynonymQuery(field,
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synonymQuery.getTerms().stream().map(TermQuery::new).toArray(TermQuery[]::new)
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);
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}
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2021-02-03 13:48:30 +01:00
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try {
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var terms = getTerms(preferredAnalyzer, field, text);
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2021-02-03 13:48:30 +01:00
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if (USE_PHRASE_QUERY) {
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return new PhraseQuery(terms.toArray(TermPosition[]::new));
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} else {
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List<BooleanQueryPart> booleanQueryParts = new LinkedList<>();
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for (TermPosition term : terms) {
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booleanQueryParts.add(new BooleanQueryPart(new TermQuery(term.getTerm()), Occur.MUST));
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}
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booleanQueryParts.add(new BooleanQueryPart(new PhraseQuery(terms.toArray(TermPosition[]::new)), Occur.FILTER));
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return new BooleanQuery(booleanQueryParts);
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}
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} catch (IOException exception) {
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throw new RuntimeException(exception);
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}
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}
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2021-02-12 19:39:02 +01:00
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private static List<TermPosition> getTerms(TextFieldsAnalyzer preferredAnalyzer, String field, String text) throws IOException {
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Analyzer analyzer = LuceneUtils.getAnalyzer(preferredAnalyzer);
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TokenStream ts = analyzer.tokenStream(field, new StringReader(text));
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return getTerms(ts, field);
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}
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private static List<TermPosition> getTerms(TokenStream ts, String field) throws IOException {
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TermToBytesRefAttribute charTermAttr = ts.addAttribute(TermToBytesRefAttribute.class);
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PositionIncrementAttribute positionIncrementTermAttr = ts.addAttribute(PositionIncrementAttribute.class);
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List<TermPosition> terms = new LinkedList<>();
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try (ts) {
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ts.reset(); // Resets this stream to the beginning. (Required)
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int termPosition = -1;
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while (ts.incrementToken()) {
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var tokenPositionIncrement = positionIncrementTermAttr.getPositionIncrement();
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termPosition += tokenPositionIncrement;
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terms.add(new TermPosition(new Term(field, charTermAttr.getBytesRef()), termPosition));
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}
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ts.end(); // Perform end-of-stream operations, e.g. set the final offset.
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}
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// Release resources associated with this stream.
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return terms;
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}
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2020-12-07 22:15:18 +01:00
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}
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