Example usage for org.apache.lucene.search IndexSearcher IndexSearcher

Introduction

In this page you can find the example usage for org.apache.lucene.search IndexSearcher IndexSearcher.

Prototype

public IndexSearcher(IndexReaderContext context) 

Source Link

Document

Creates a searcher searching the provided top-level IndexReaderContext .

Usage

From source file:at.ac.univie.mminf.luceneSKOS.analysis.SKOSLabelFilterTest.java

License:Apache License

@Test
public void queryParserSearch() throws IOException, ParseException {

    Document doc = new Document();
    doc.add(new Field("content", "The quick brown fox jumps over the lazy dog", Field.Store.YES,
            Field.Index.ANALYZED));

    writer.addDocument(doc);/*from  w  w w  .  java 2  s. c  o m*/

    searcher = new IndexSearcher(IndexReader.open(writer, false));

    Query query = new QueryParser(Version.LUCENE_36, "content", skosAnalyzer).parse("\"fox jumps\"");

    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:\"fox (jumps hops leaps)\"", query.toString());
    Assert.assertEquals("org.apache.lucene.search.MultiPhraseQuery", query.getClass().getName());

    query = new QueryParser(Version.LUCENE_36, "content", new StandardAnalyzer(Version.LUCENE_36))
            .parse("\"fox jumps\"");
    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:\"fox jumps\"", query.toString());
    Assert.assertEquals("org.apache.lucene.search.PhraseQuery", query.getClass().getName());

}

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From source file:at.ac.univie.mminf.luceneSKOS.analysis.SKOSLabelFilterTest.java

License:Apache License

@Test
public void testTermQuery() throws CorruptIndexException, IOException, ParseException {

    Document doc = new Document();
    doc.add(new Field("content", "I work for the united nations", Field.Store.YES, Field.Index.ANALYZED));

    writer.addDocument(doc);/*from   w w w .  j av  a 2s.  c  o  m*/

    searcher = new IndexSearcher(IndexReader.open(writer, false));

    QueryParser parser = new QueryParser(Version.LUCENE_36, "content", new SimpleAnalyzer(Version.LUCENE_36));

    Query query = parser.parse("united nations");

    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

}

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From source file:at.ac.univie.mminf.luceneSKOS.analysis.SKOSURIFilterTest.java

License:Apache License

@Test
public void singleUriExpansionWithStoredField() throws CorruptIndexException, IOException {

    Document doc = new Document();
    doc.add(new Field("subject", "http://example.com/concept/1", Field.Store.YES, Field.Index.ANALYZED));

    writer.addDocument(doc);//from  ww  w.j  av a 2s . c om

    searcher = new IndexSearcher(IndexReader.open(writer, false));

    Query query = new TermQuery(new Term("subject", "leaps"));

    TopDocs results = searcher.search(query, 10);
    Assert.assertEquals(1, results.totalHits);

    Document indexDoc = searcher.doc(results.scoreDocs[0].doc);

    String[] fieldValues = indexDoc.getValues("subject");

    Assert.assertEquals(1, fieldValues.length);

    Assert.assertEquals(fieldValues[0], "http://example.com/concept/1");

}

---

From source file:at.ac.univie.mminf.luceneSKOS.analysis.SKOSURIFilterTest.java

License:Apache License

@Test
public void singleUriExpansionWithUnstoredField() throws CorruptIndexException, IOException {

    Document doc = new Document();
    doc.add(new Field("subject", "http://example.com/concept/1", Field.Store.NO, Field.Index.ANALYZED));

    writer.addDocument(doc);/* w  w w . j  av  a 2 s.c o m*/

    searcher = new IndexSearcher(IndexReader.open(writer, false));

    Query query = new TermQuery(new Term("subject", "jumps"));

    TopDocs results = searcher.search(query, 10);
    Assert.assertEquals(1, results.totalHits);

    Document indexDoc = searcher.doc(results.scoreDocs[0].doc);

    String[] fieldValues = indexDoc.getValues("subject");

    Assert.assertEquals(0, fieldValues.length);

}

---

From source file:at.ac.univie.mminf.luceneSKOS.analysis.SKOSURIFilterTest.java

License:Apache License

@Test
public void multipleURIExpansion() throws CorruptIndexException, IOException {

    Document doc = new Document();
    doc.add(new Field("subject", "http://example.com/concept/1", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("subject", "http://example.com/concept/2", Field.Store.YES, Field.Index.ANALYZED));

    writer.addDocument(doc);//from  www .jav  a2s .  c  o  m

    searcher = new IndexSearcher(IndexReader.open(writer, false));

    // querying for alternative term of concept 1
    Query query = new TermQuery(new Term("subject", "hops"));

    TopDocs results = searcher.search(query, 10);
    Assert.assertEquals(1, results.totalHits);

    Document indexDoc = searcher.doc(results.scoreDocs[0].doc);

    String[] fieldValues = indexDoc.getValues("subject");

    Assert.assertEquals(2, fieldValues.length);

    // querying for alternative term of concept 2
    query = new TermQuery(new Term("subject", "speedy"));

    results = searcher.search(query, 10);
    Assert.assertEquals(1, results.totalHits);

    indexDoc = searcher.doc(results.scoreDocs[0].doc);

    fieldValues = indexDoc.getValues("subject");

    Assert.assertEquals(2, fieldValues.length);

}

---

From source file:at.ac.univie.mminf.luceneSKOS.LabelbasedTermExpansionTest.java

License:Apache License

/**
 * This test indexes a sample metadata record (=lucene document) having a
 * "title", "description", and "subject" field.
 * /* w w  w  .ja  v  a2 s.c  om*/
 * A search for "arms" returns that record as a result because "arms" is
 * defined as an alternative label for "weapons", the term which is contained
 * in the subject field.
 * 
 * @throws IOException
 */
@Test
public void labelBasedTermExpansion() throws IOException {

    /* defining the document to be indexed */
    Document doc = new Document();
    doc.add(new Field("title", "Spearhead", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("description",
            "Roman iron spearhead. The spearhead was attached to one end of a wooden shaft..."
                    + "The spear was mainly a thrusting weapon, but could also be thrown. "
                    + "It was the principal weapon of the auxiliary soldier... "
                    + "(second - fourth century, Arbeia Roman Fort).",
            Field.Store.NO, Field.Index.ANALYZED));
    doc.add(new Field("subject", "weapons", Field.Store.NO, Field.Index.ANALYZED));

    /* setting up the SKOS analyzer */
    String skosFile = "src/test/resources/skos_samples/ukat_examples.n3";

    /* ExpansionType.URI->the field to be analyzed (expanded) contains URIs */
    Analyzer skosAnalyzer = new SKOSAnalyzer(matchVersion, skosFile, ExpansionType.LABEL);

    /* Define different analyzers for different fields */
    Map<String, Analyzer> analyzerPerField = new HashMap<String, Analyzer>();
    analyzerPerField.put("subject", skosAnalyzer);
    PerFieldAnalyzerWrapper indexAnalyzer = new PerFieldAnalyzerWrapper(new SimpleAnalyzer(matchVersion),
            analyzerPerField);

    /* setting up a writer with a default (simple) analyzer */
    writer = new IndexWriter(new RAMDirectory(), new IndexWriterConfig(matchVersion, indexAnalyzer));

    /* adding the document to the index */
    writer.addDocument(doc);

    /* defining a query that searches over all fields */
    BooleanQuery query1 = new BooleanQuery();
    query1.add(new TermQuery(new Term("title", "arms")), BooleanClause.Occur.SHOULD);
    query1.add(new TermQuery(new Term("description", "arms")), BooleanClause.Occur.SHOULD);
    query1.add(new TermQuery(new Term("subject", "arms")), BooleanClause.Occur.SHOULD);

    /* creating a new searcher */
    searcher = new IndexSearcher(IndexReader.open(writer, false));

    TopDocs results = searcher.search(query1, 10);

    /* the document matches because "arms" is among the expanded terms */
    Assert.assertEquals(1, results.totalHits);

    /* defining a query that searches for a broader concept */
    Query query2 = new TermQuery(new Term("subject", "military equipment"));

    results = searcher.search(query2, 10);

    /* ... also returns the document as result */
    Assert.assertEquals(1, results.totalHits);

}

---

From source file:at.ac.univie.mminf.luceneSKOS.queryparser.flexible.standard.SKOSStandardQueryParserTest.java

License:Apache License

@Test
public void queryParserSearch() throws IOException, QueryNodeException {

    Document doc = new Document();
    doc.add(new Field("content", "The quick brown fox jumps over the lazy dog", TextField.TYPE_STORED));

    writer.addDocument(doc);/*  ww  w  . j a  v a 2 s .  c  o m*/

    searcher = new IndexSearcher(DirectoryReader.open(writer, false));

    Query query = new SKOSStandardQueryParser(skosAnalyzer).parse("\"fox jumps\"", "content");

    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:\"fox (jumps hops leaps)\"", query.toString());
    Assert.assertEquals("org.apache.lucene.search.MultiPhraseQuery", query.getClass().getName());

    query = new StandardQueryParser(new StandardAnalyzer(matchVersion)).parse("\"fox jumps\"", "content");
    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:\"fox jumps\"", query.toString());
    Assert.assertEquals("org.apache.lucene.search.PhraseQuery", query.getClass().getName());

}

---

From source file:at.ac.univie.mminf.luceneSKOS.queryparser.flexible.standard.SKOSStandardQueryParserTest.java

License:Apache License

@Test
public void queryParserSearchWithBoosts() throws IOException, QueryNodeException {

    Document doc = new Document();
    doc.add(new Field("content", "The quick brown fox jumps over the lazy dog", TextField.TYPE_STORED));

    writer.addDocument(doc);//  ww  w.ja  v a2  s  .  com

    searcher = new IndexSearcher(DirectoryReader.open(writer, false));

    SKOSStandardQueryParser parser = new SKOSStandardQueryParser(skosAnalyzer);
    parser.setBoost(SKOSType.ALT, 0.5f);

    Query query = parser.parse("\"fox jumps\"", "content");

    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    // boosts do not work in phrase queries
    Assert.assertEquals("content:\"fox (jumps hops leaps)\"", query.toString());
    Assert.assertEquals("org.apache.lucene.search.MultiPhraseQuery", query.getClass().getName());

    query = parser.parse("fox jumps", "content");

    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:fox (content:jumps content:hops^0.5 content:leaps^0.5)", query.toString());
    Assert.assertEquals("org.apache.lucene.search.BooleanQuery", query.getClass().getName());

    query = new SKOSStandardQueryParser(new StandardAnalyzer(matchVersion)).parse("fox jumps", "content");
    Assert.assertEquals(1, TestUtil.hitCount(searcher, query));

    Assert.assertEquals("content:fox content:jumps", query.toString());
    Assert.assertEquals("org.apache.lucene.search.BooleanQuery", query.getClass().getName());

}

---

From source file:at.ac.univie.mminf.luceneSKOS.skos.impl.SKOSEngineImpl.java

License:Apache License

/**
 * This constructor loads the SKOS model from a given InputStream using the
 * given serialization language parameter, which must be either N3, RDF/XML,
 * or TURTLE./*from  w  ww. jav  a2s. com*/
 * 
 * @param inputStream
 *          the input stream
 * @param lang
 *          the serialization language
 * @throws IOException
 *           if the model cannot be loaded
 */
public SKOSEngineImpl(final Version version, InputStream inputStream, String lang) throws IOException {

    if (!("N3".equals(lang) || "RDF/XML".equals(lang) || "TURTLE".equals(lang))) {
        throw new IOException("Invalid RDF serialization format");
    }

    matchVersion = version;

    analyzer = new SimpleAnalyzer(matchVersion);

    skosModel = ModelFactory.createDefaultModel();

    skosModel.read(inputStream, null, lang);

    indexDir = new RAMDirectory();

    entailSKOSModel();

    indexSKOSModel();

    searcher = new IndexSearcher(IndexReader.open(indexDir));
}

---

From source file:at.ac.univie.mminf.luceneSKOS.skos.impl.SKOSEngineImpl.java

License:Apache License

/**
 * This constructor loads the SKOS model from a given filename or URI, starts
 * the indexing process and sets up the index searcher.
 * //w  w  w.j  a v a 2  s  . c  o m
 * @param languages
 *          the languages to be considered
 * @param filenameOrURI
 * @throws IOException
 */
public SKOSEngineImpl(final Version version, String filenameOrURI, String... languages) throws IOException {
    matchVersion = version;
    analyzer = new SimpleAnalyzer(matchVersion);

    String langSig = "";
    if (languages != null) {
        this.languages = new TreeSet<String>(Arrays.asList(languages));
        langSig = "-" + StringUtils.join(this.languages, ".");
    }

    String name = FilenameUtils.getName(filenameOrURI);
    File dir = new File("skosdata/" + name + langSig);
    indexDir = FSDirectory.open(dir);

    // TODO: Generate also if source file is modified
    if (!dir.isDirectory()) {
        // load the skos model from the given file
        FileManager fileManager = new FileManager();
        fileManager.addLocatorFile();
        fileManager.addLocatorURL();
        fileManager.addLocatorClassLoader(SKOSEngineImpl.class.getClassLoader());

        if (FilenameUtils.getExtension(filenameOrURI).equals("zip")) {
            fileManager.addLocatorZip(filenameOrURI);
            filenameOrURI = FilenameUtils.getBaseName(filenameOrURI);
        }

        skosModel = fileManager.loadModel(filenameOrURI);

        entailSKOSModel();

        indexSKOSModel();
    }

    searcher = new IndexSearcher(IndexReader.open(indexDir));
}

---

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