Package org.apache.lucene.expressions

Examples of org.apache.lucene.expressions.Expression

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    IndexSearcher searcher = new IndexSearcher(indexReader);
    TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);

    // Aggregate categories by an expression that combines the document's score
    // and its popularity field
    Expression expr = JavascriptCompiler.compile("_score * sqrt(popularity)");
    SimpleBindings bindings = new SimpleBindings();
    bindings.add(new SortField("_score", SortField.Type.SCORE)); // the score of the document
    bindings.add(new SortField("popularity", SortField.Type.LONG)); // the value of the 'popularity' field

    FacetSearchParams fsp = new FacetSearchParams(
        new SumValueSourceFacetRequest(new CategoryPath("A"), 10, expr.getValueSource(bindings), true));

    // Aggregates the facet values
    FacetsCollector fc = FacetsCollector.create(fsp, searcher.getIndexReader(), taxoReader);

    // MatchAllDocsQuery is for "browsing" (counts facets
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    searcher = new IndexSearcher(DirectoryReader.open(writer, true));
    writer.close();
  }

  private ValueSource getDistanceValueSource() {
    Expression distance;
    try {
      distance = JavascriptCompiler.compile(
                  "haversin(" + ORIGIN_LATITUDE + "," + ORIGIN_LONGITUDE + ",latitude,longitude)");
    } catch (ParseException pe) {
      // Should not happen
      throw new RuntimeException(pe);
    }
    SimpleBindings bindings = new SimpleBindings();
    bindings.add(new SortField("latitude", SortField.Type.DOUBLE));
    bindings.add(new SortField("longitude", SortField.Type.DOUBLE));

    return distance.getValueSource(bindings);
  }
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    IndexSearcher searcher = new IndexSearcher(indexReader);
    TaxonomyReader taxoReader = new DirectoryTaxonomyReader(taxoDir);

    // Aggregate categories by an expression that combines the document's score
    // and its popularity field
    Expression expr = JavascriptCompiler.compile("_score * sqrt(popularity)");
    SimpleBindings bindings = new SimpleBindings();
    bindings.add(new SortField("_score", SortField.Type.SCORE)); // the score of the document
    bindings.add(new SortField("popularity", SortField.Type.LONG)); // the value of the 'popularity' field

    // Aggregates the facet values
    FacetsCollector fc = new FacetsCollector(true);

    // MatchAllDocsQuery is for "browsing" (counts facets
    // for all non-deleted docs in the index); normally
    // you'd use a "normal" query:
    FacetsCollector.search(searcher, new MatchAllDocsQuery(), 10, fc);

    // Retrieve results
    Facets facets = new TaxonomyFacetSumValueSource(taxoReader, config, fc, expr.getValueSource(bindings));
    FacetResult result = facets.getTopChildren(10, "A");
   
    indexReader.close();
    taxoReader.close();
   
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    searcher = new IndexSearcher(DirectoryReader.open(writer, true));
    writer.close();
  }

  private ValueSource getDistanceValueSource() {
    Expression distance;
    try {
      distance = JavascriptCompiler.compile(
                  "haversin(" + ORIGIN_LATITUDE + "," + ORIGIN_LONGITUDE + ",latitude,longitude)");
    } catch (ParseException pe) {
      // Should not happen
      throw new RuntimeException(pe);
    }
    SimpleBindings bindings = new SimpleBindings();
    bindings.add(new SortField("latitude", SortField.Type.DOUBLE));
    bindings.add(new SortField("longitude", SortField.Type.DOUBLE));

    return distance.getValueSource(bindings);
  }
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public class TestJavascriptFunction extends LuceneTestCase {
  private static double DELTA = 0.0000001;
 
  private void assertEvaluatesTo(String expression, double expected) throws Exception {
    Expression evaluator = JavascriptCompiler.compile(expression);
    double actual = evaluator.evaluate(0, null);
    assertEquals(expected, actual, DELTA);
  }
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import org.apache.lucene.expressions.Expression;
import org.apache.lucene.util.LuceneTestCase;

public class TestJavascriptOperations extends LuceneTestCase {
  private void assertEvaluatesTo(String expression, long expected) throws Exception {
    Expression evaluator = JavascriptCompiler.compile(expression);
    long actual = (long)evaluator.evaluate(0, null);
    assertEquals(expected, actual);
  }
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  }
 
  /** using the default map explicitly */
  public void testDefaultList() throws Exception {
    Map<String,Method> functions = JavascriptCompiler.DEFAULT_FUNCTIONS;
    Expression expr = JavascriptCompiler.compile("sqrt(20)", functions, getClass().getClassLoader());
    assertEquals(Math.sqrt(20), expr.evaluate(0, null), DELTA);
  }
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  /** tests a method with no arguments */
  public void testNoArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<>();
    functions.put("foo", getClass().getMethod("zeroArgMethod"));
    Expression expr = JavascriptCompiler.compile("foo()", functions, getClass().getClassLoader());
    assertEquals(5, expr.evaluate(0, null), DELTA);
  }
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  /** tests a method with one arguments */
  public void testOneArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<>();
    functions.put("foo", getClass().getMethod("oneArgMethod", double.class));
    Expression expr = JavascriptCompiler.compile("foo(3)", functions, getClass().getClassLoader());
    assertEquals(6, expr.evaluate(0, null), DELTA);
  }
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  /** tests a method with three arguments */
  public void testThreeArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<>();
    functions.put("foo", getClass().getMethod("threeArgMethod", double.class, double.class, double.class));
    Expression expr = JavascriptCompiler.compile("foo(3, 4, 5)", functions, getClass().getClassLoader());
    assertEquals(12, expr.evaluate(0, null), DELTA);
  }
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Related Classes of org.apache.lucene.expressions.Expression

  • org.apache.lucene.demo.facet.DistanceFacetsExample
  • org.apache.lucene.demo.facet.ExpressionAggregationFacetsExample
  • org.apache.lucene.expressions.js.TestCustomFunctions
  • org.apache.lucene.expressions.js.TestJavascriptFunction
  • org.apache.lucene.expressions.js.TestJavascriptOperations
  • org.apache.lucene.search.suggest.DocumentExpressionDictionary
  • org.elasticsearch.script.expression.ExpressionScriptEngineService
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