Examples with PhraseQuery gate.creole.annic.apache.lucene.search.PhraseQuery used on opensource projects

Example 1 with PhraseQuery

use of gate.creole.annic.apache.lucene.search.PhraseQuery in project gate-core by GateNLP.

the class QueryParser method parse.

/**
 * Given a query, this method parses it to convert it into one or more
 * lucene queries.
 * @throws gate.creole.ir.SearchException
 */
public Query[] parse(String field, String query, String baseTokenAnnotationType, String corpusID, String annotationSetToSearchIn) throws gate.creole.ir.SearchException {
    this.field = field;
    this.baseTokenAnnotationType = baseTokenAnnotationType;
    this.position = 0;
    // at the moment this supports only | operator
    // it also support klene operators * and +
    // implicit operator is &
    // It supports simple String queries
    // it supports eight kinds of tokens
    // 1. String (without quotes)
    // 2. "String" (with quotes)
    // 3. {AnnotationType}
    // 4. {AnnotationType==String}
    // 5. {AnnotationType=="String"}
    // 7. {AnnotationType.feature==string}
    // 8. {AnnotationType.feature=="string"}
    // Steps
    // The query would we searched from left to right order
    // returned arraylist contains queries where each query is required
    // to
    // be converted into the Phrase query
    queries = SubQueryParser.parseQuery(query);
    Query[] q = new Query[queries.size()];
    for (int i = 0; i < queries.size(); i++) {
        Query phraseQuery = createPhraseQuery(queries.get(i));
        // boolean query
        if (corpusID == null && annotationSetToSearchIn == null) {
            BooleanQuery booleanQuery = new BooleanQuery();
            Term t = new Term(Constants.ANNOTATION_SET_ID, Constants.COMBINED_SET);
            TermQuery tQuery = new TermQuery(t);
            booleanQuery.add(tQuery, false, true);
            booleanQuery.add(phraseQuery, true, false);
            q[i] = booleanQuery;
        } else {
            BooleanQuery booleanQuery = new BooleanQuery();
            booleanQuery.add(phraseQuery, true, false);
            if (corpusID != null) {
                Term t = new Term(Constants.CORPUS_ID, corpusID);
                TermQuery tQuery = new TermQuery(t);
                booleanQuery.add(tQuery, true, false);
            }
            if (annotationSetToSearchIn != null) {
                Term t = new Term(Constants.ANNOTATION_SET_ID, annotationSetToSearchIn);
                TermQuery tQuery = new TermQuery(t);
                booleanQuery.add(tQuery, true, false);
            } else {
                Term t = new Term(Constants.ANNOTATION_SET_ID, Constants.COMBINED_SET);
                TermQuery tQuery = new TermQuery(t);
                booleanQuery.add(tQuery, false, true);
            }
            q[i] = booleanQuery;
        }
    }
    return q;
}

Example 2 with PhraseQuery

use of gate.creole.annic.apache.lucene.search.PhraseQuery in project gate-core by GateNLP.

the class QueryParser method createPhraseQuery.

/**
 * This method will create each normalized query into a Phrase or Term
 * query If the query has only one term to search, it will be returned
 * as a TermQuery otherwise, it will be returned as the PhraseQuery
 */
private Query createPhraseQuery(String query) throws gate.creole.ir.SearchException {
    // Here we play the actual trick with lucene
    // For a query like {Lookup}{Token}{Person.gender=="male"}
    // internally this query is converted into the following PhraseQuery
    // (Lookup Token Person male)
    // these are the four terms which will be searched and they should
    // occur
    // in this order only
    // but what we need is
    // a pattern where
    // Lookup -> the first annotation is of type Lookup
    // Token -> the second annotation type is Token
    // Person male -> and the third annotation must have a type person
    // and a
    // feature gender with male
    // that means Person and male should be considered at the same
    // location
    // By default lucene doesn't do this and look for a position that is
    // 1
    // step more than the previous one
    // so it will search for the first position of Lookup
    // let say it is 19 (i.e. 19th annotation in the document)
    // then it would consider 20th location for Token
    // 21st for Person
    // 22nd for male
    // but we need, 19th for Lookup, 20th for Token and 21st for both
    // Person
    // and Male
    // so from here itself we send our choice for the Location of
    // annotations in this termPositions array :-).
    // isn't it a great crack?
    position = 0;
    PhraseQuery phQuery = new PhraseQuery();
    // we will tokenize this query to convert it into different tokens
    // query is like {Person}"said" "Hello" {Person.gender=="male"}
    // we need to convert this into different tokens
    // {Person}
    // "said"
    // "Hello"
    // {Person.gender=="male"}
    List<String> tokens = findTokens(query);
    // and then convert each token into separate terms
    if (tokens.size() == 1) {
        List<?>[] termsPos = createTerms(tokens.get(0));
        @SuppressWarnings("unchecked") List<Term> terms = (List<Term>) termsPos[0];
        if (terms.size() == 1) {
            if (areAllTermsTokens)
                needValidation = false;
            else
                needValidation = true;
            return new TermQuery(terms.get(0));
        } else {
            position = 0;
        }
    }
    int totalTerms = 0;
    boolean hadPreviousTermsAToken = true;
    needValidation = false;
    // and now for each token we need to create Term(s)
    outer: for (int i = 0; i < tokens.size(); i++) {
        List<?>[] termpositions = createTerms(tokens.get(i));
        @SuppressWarnings("unchecked") List<Term> terms = (List<Term>) termpositions[0];
        @SuppressWarnings("unchecked") List<Integer> pos = (List<Integer>) termpositions[1];
        @SuppressWarnings("unchecked") List<Boolean> consider = (List<Boolean>) termpositions[2];
        boolean allTermsTokens = true;
        // lets first find out if there's any token in this terms
        for (int k = 0; k < terms.size(); k++) {
            Term t = terms.get(k);
            if (allTermsTokens)
                allTermsTokens = isBaseTokenTerm(t);
        }
        if (!hadPreviousTermsAToken) {
            needValidation = true;
            break;
        }
        if (!allTermsTokens) {
            // we want to break here
            needValidation = true;
            if (i > 0)
                break outer;
        }
        for (int k = 0; k < terms.size(); k++) {
            Term t = terms.get(k);
            boolean considerValue = consider.get(k).booleanValue();
            phQuery.add(t, pos.get(k), considerValue);
            if (considerValue)
                totalTerms++;
        }
        hadPreviousTermsAToken = allTermsTokens;
    }
    phQuery.setTotalTerms(totalTerms);
    return phQuery;
}

Example 3 with PhraseQuery

use of gate.creole.annic.apache.lucene.search.PhraseQuery in project gate-core by GateNLP.

the class StatsCalculator method freq.

/**
 * Allows retriving frequencies for the given parameters. Please make
 * sure that you close the searcher on your own. Failing to do so may
 * result into many files being opened at the same time and that can
 * cause the problem with your OS.
 * @throws SearchException
 */
public static int freq(IndexSearcher searcher, String corpusToSearchIn, String annotationSetToSearchIn, String annotationType, String featureName, String value) throws SearchException {
    try {
        corpusToSearchIn = corpusToSearchIn == null || corpusToSearchIn.trim().length() == 0 ? null : corpusToSearchIn.trim();
        annotationSetToSearchIn = annotationSetToSearchIn == null || annotationSetToSearchIn.trim().length() == 0 ? null : annotationSetToSearchIn.trim();
        if (annotationType == null)
            throw new SearchException("Annotation Type cannot be null");
        // term that contains a value to be searched in the index
        Term term = null;
        if (featureName == null && value == null) {
            term = new Term("contents", annotationType, "*");
        } else if (featureName != null && value == null) {
            term = new Term("contents", annotationType + "." + featureName, "**");
        } else if (featureName == null) {
            throw new SearchException("FeatureName cannot be null");
        } else {
            term = new Term("contents", value, annotationType + "." + featureName);
        }
        // term query
        TermQuery tq = new TermQuery(term);
        // indicates whether we want to use booleanQuery
        boolean useBooleanQuery = false;
        BooleanQuery bq = new BooleanQuery();
        if (corpusToSearchIn != null) {
            PhraseQuery cq = new PhraseQuery();
            cq.add(new Term(Constants.CORPUS_ID, corpusToSearchIn), 0, true);
            bq.add(cq, true, false);
            useBooleanQuery = true;
        }
        if (annotationSetToSearchIn != null) {
            PhraseQuery aq = new PhraseQuery();
            aq.add(new Term(Constants.ANNOTATION_SET_ID, annotationSetToSearchIn), 0, true);
            bq.add(aq, true, false);
            useBooleanQuery = true;
        }
        Hits corpusHits = null;
        if (useBooleanQuery) {
            bq.add(tq, true, false);
            corpusHits = searcher.search(bq);
        } else {
            corpusHits = searcher.search(tq);
        }
        List<?>[] firstTermPositions = searcher.getFirstTermPositions();
        // if no result available, set null to our scores
        if (firstTermPositions[0].size() == 0) {
            return 0;
        }
        int size = 0;
        // information
        for (int hitIndex = 0; hitIndex < corpusHits.length(); hitIndex++) {
            int index = firstTermPositions[0].indexOf(new Integer(corpusHits.id(hitIndex)));
            // we fetch all the first term positions for the query
            // issued
            Integer freq = (Integer) firstTermPositions[4].get(index);
            size += freq.intValue();
        }
        return size;
    } catch (IOException ioe) {
        throw new SearchException(ioe);
    } finally {
        searcher.initializeTermPositions();
    }
}