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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2011/01/25 14:20:45 UTC
[jira] Resolved: (LUCENE-522) SpanFuzzyQuery
[ https://issues.apache.org/jira/browse/LUCENE-522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir resolved LUCENE-522.
--------------------------------
Resolution: Duplicate
This is fixed in LUCENE-2754, you can use any multitermquery in spans.
> SpanFuzzyQuery
> --------------
>
> Key: LUCENE-522
> URL: https://issues.apache.org/jira/browse/LUCENE-522
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Affects Versions: 1.9
> Reporter: Karl Wettin
> Priority: Minor
>
> This is my SpanFuzzyQuery. It is released under the Apache licensence. Just paste it in.
> package se.snigel.lucene;
> import org.apache.lucene.index.IndexReader;
> import org.apache.lucene.index.Term;
> import org.apache.lucene.search.*;
> import org.apache.lucene.search.spans.SpanOrQuery;
> import org.apache.lucene.search.spans.SpanQuery;
> import org.apache.lucene.search.spans.SpanTermQuery;
> import org.apache.lucene.search.spans.Spans;
> import java.io.IOException;
> import java.util.Collection;
> import java.util.LinkedList;
> /**
> * @author Karl Wettin <ka...@snigel.net>
> */
> public class SpanFuzzyQuery extends SpanQuery {
> public final static float defaultMinSimilarity = 0.7f;
> public final static int defaultPrefixLength = 0;
> private final Term term;
> private final float minimumSimilarity;
> private final int prefixLength;
> private BooleanQuery rewrittenFuzzyQuery;
> public SpanFuzzyQuery(Term term) {
> this(term, defaultMinSimilarity, defaultPrefixLength);
> }
> public SpanFuzzyQuery(Term term, float minimumSimilarity, int prefixLength) {
> this.term = term;
> this.minimumSimilarity = minimumSimilarity;
> this.prefixLength = prefixLength;
> if (minimumSimilarity >= 1.0f) {
> throw new IllegalArgumentException("minimumSimilarity >= 1");
> } else if (minimumSimilarity < 0.0f) {
> throw new IllegalArgumentException("minimumSimilarity < 0");
> }
> if (prefixLength < 0) {
> throw new IllegalArgumentException("prefixLength < 0");
> }
> }
> public Query rewrite(IndexReader reader) throws IOException {
> FuzzyQuery fuzzyQuery = new FuzzyQuery(term, minimumSimilarity, prefixLength);
> rewrittenFuzzyQuery = (BooleanQuery) fuzzyQuery.rewrite(reader);
> BooleanClause[] clauses = rewrittenFuzzyQuery.getClauses();
> SpanQuery[] spanQueries = new SpanQuery[clauses.length];
> for (int i = 0; i < clauses.length; i++) {
> BooleanClause clause = clauses[i];
> TermQuery termQuery = (TermQuery) clause.getQuery();
> spanQueries[i] = new SpanTermQuery(termQuery.getTerm());
> spanQueries[i].setBoost(termQuery.getBoost());
> }
> SpanOrQuery query = new SpanOrQuery(spanQueries);
> query.setBoost(fuzzyQuery.getBoost());
> return query;
> }
> /** Expert: Returns the matches for this query in an index. Used internally
> * to search for spans. */
> public Spans getSpans(IndexReader reader) throws IOException {
> throw new UnsupportedOperationException("Query should have been rewritten");
> }
> /** Returns the name of the field matched by this query.*/
> public String getField() {
> return term.field();
> }
> /** Returns a collection of all terms matched by this query.*/
> public Collection getTerms() {
> if (rewrittenFuzzyQuery == null) {
> throw new RuntimeException("Query must be rewritten prior to calling getTerms()!");
> } else {
> LinkedList<Term> terms = new LinkedList<Term>();
> BooleanClause[] clauses = rewrittenFuzzyQuery.getClauses();
> for (int i = 0; i < clauses.length; i++) {
> BooleanClause clause = clauses[i];
> TermQuery termQuery = (TermQuery) clause.getQuery();
> terms.add(termQuery.getTerm());
> }
> return terms;
> }
> }
> /** Prints a query to a string, with <code>field</code> as the default field
> * for terms. <p>The representation used is one that is supposed to be readable
> * by {@link org.apache.lucene.queryParser.QueryParser QueryParser}. However,
> * there are the following limitations:
> * <ul>
> * <li>If the query was created by the parser, the printed
> * representation may not be exactly what was parsed. For example,
> * characters that need to be escaped will be represented without
> * the required backslash.</li>
> * <li>Some of the more complicated queries (e.g. span queries)
> * don't have a representation that can be parsed by QueryParser.</li>
> * </ul>
> */
> public String toString(String field) {
> return "spans(" + rewrittenFuzzyQuery.toString() + ")";
> }
> }
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