Package org.apache.lucene.expressions

Examples of org.apache.lucene.expressions.Expression.evaluate()

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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);
  }
 
  public void testAbsMethod() throws Exception {
    assertEvaluatesTo("abs(0)", 0);
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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);
  }
 
  public static double zeroArgMethod() { return 5; }
 
  /** tests a method with no arguments */
 
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  /** tests a method with no arguments */
  public void testNoArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<String,Method>();
    functions.put("foo", getClass().getMethod("zeroArgMethod"));
    Expression expr = JavascriptCompiler.compile("foo()", functions, getClass().getClassLoader());
    assertEquals(5, expr.evaluate(0, null), DELTA);
  }
 
  public static double oneArgMethod(double arg1) { return 3 + arg1; }
 
  /** tests a method with one arguments */
 
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  /** tests a method with one arguments */
  public void testOneArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<String,Method>();
    functions.put("foo", getClass().getMethod("oneArgMethod", double.class));
    Expression expr = JavascriptCompiler.compile("foo(3)", functions, getClass().getClassLoader());
    assertEquals(6, expr.evaluate(0, null), DELTA);
  }
 
  public static double threeArgMethod(double arg1, double arg2, double arg3) { return arg1 + arg2 + arg3; }
 
  /** tests a method with three arguments */
 
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  /** tests a method with three arguments */
  public void testThreeArgMethod() throws Exception {
    Map<String,Method> functions = new HashMap<String,Method>();
    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);
  }
 
  /** tests a map with 2 functions */
  public void testTwoMethods() throws Exception {
    Map<String,Method> functions = new HashMap<String,Method>();
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  public void testTwoMethods() throws Exception {
    Map<String,Method> functions = new HashMap<String,Method>();
    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);
  }
 
  public static String bogusReturnType() { return "bogus!"; }
 
  /** wrong return type: must be double */
 
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    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();
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    // mix foreign and default functions
    Map<String,Method> mixedFunctions = new HashMap<String,Method>(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 {
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    Map<String,Method> mixedFunctions = new HashMap<String,Method>(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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    Map<String,Method> functions = new HashMap<String,Method>();
    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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