Examples of org.apache.lucene.expressions.Expression

org.apache.lucene.expressions.Expression
ile an expression: Expression expr = JavascriptCompiler.compile("sqrt(_score) + ln(popularity)"); // SimpleBindings just maps variables to SortField instances SimpleBindings bindings = new SimpleBindings(); bindings.add(new SortField("_score", SortField.Type.SCORE)); bindings.add(new SortField("popularity", SortField.Type.INT)); // create a sort field and sort by it (reverse order) Sort sort = new Sort(expr.getSortField(bindings, true)); Query query = new TermQuery(new Term("body", "contents")); searcher.search(query, null, 10, sort); @see JavascriptCompiler#compile @lucene.experimental

  /** tests a map with 2 functions */
  public void testTwoMethods() throws Exception {
    Map<String,Method> functions = new HashMap<>();
    functions.put("foo", getClass().getMethod("zeroArgMethod"));
    functions.put("bar", getClass().getMethod("oneArgMethod", double.class));
    Expression expr = JavascriptCompiler.compile("foo() + bar(3)", functions, getClass().getClassLoader());
    assertEquals(11, expr.evaluate(0, null), DELTA);
  }

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    Map<String,Method> functions = Collections.singletonMap("bar", barMethod);
    assertNotSame(thisLoader, fooClass.getClassLoader());
    assertNotSame(thisLoader, barMethod.getDeclaringClass().getClassLoader());
    
    // this should pass:
    Expression expr = JavascriptCompiler.compile("bar()", functions, childLoader);
    assertEquals(2.0, expr.evaluate(0, null), DELTA);
    
    // use our classloader, not the foreign one, which should fail!
    try {
      JavascriptCompiler.compile("bar()", functions, thisLoader);
      fail();
    } catch (IllegalArgumentException e) {
      assertTrue(e.getMessage().contains("is not declared by a class which is accessible by the given parent ClassLoader"));
    }
    
    // mix foreign and default functions
    Map<String,Method> mixedFunctions = new HashMap<>(JavascriptCompiler.DEFAULT_FUNCTIONS);
    mixedFunctions.putAll(functions);
    expr = JavascriptCompiler.compile("bar()", mixedFunctions, childLoader);
    assertEquals(2.0, expr.evaluate(0, null), DELTA);
    expr = JavascriptCompiler.compile("sqrt(20)", mixedFunctions, childLoader);
    assertEquals(Math.sqrt(20), expr.evaluate(0, null), DELTA);
    
    // use our classloader, not the foreign one, which should fail!
    try {
      JavascriptCompiler.compile("bar()", mixedFunctions, thisLoader);
      fail();

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  /** the method throws an exception. We should check the stack trace that it contains the source code of the expression as file name. */
  public void testThrowingException() throws Exception {
    Map<String,Method> functions = new HashMap<>();
    functions.put("foo", StaticThrowingException.class.getMethod("method"));
    String source = "3 * foo() / 5";
    Expression expr = JavascriptCompiler.compile(source, functions, getClass().getClassLoader());
    try {
      expr.evaluate(0, null);
      fail();
    } catch (ArithmeticException e) {
      assertEquals(MESSAGE, e.getMessage());
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);

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  /** test that namespaces work with custom expressions. */
  public void testNamespaces() throws Exception {
    Map<String, Method> functions = new HashMap<>();
    functions.put("foo.bar", getClass().getMethod("zeroArgMethod"));
    String source = "foo.bar()";
    Expression expr = JavascriptCompiler.compile(source, functions, getClass().getClassLoader());
    assertEquals(5, expr.evaluate(0, null), DELTA);
  }

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        }
    }


    @Override
    public SearchScript search(Object compiledScript, SearchLookup lookup, @Nullable Map<String, Object> vars) {
        Expression expr = (Expression)compiledScript;
        MapperService mapper = lookup.doc().mapperService();
        // NOTE: if we need to do anything complicated with bindings in the future, we can just extend Bindings,
        // instead of complicating SimpleBindings (which should stay simple)
        SimpleBindings bindings = new SimpleBindings();
        ReplaceableConstValueSource specialValue = null;

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