Examples of tcg.common.util.ExpressionParser.evaluate()

tcg.common.util.ExpressionParser.evaluate()
Evaluate the expression.
If the expression is not yet parsed, it will be parsed. If the operation (both the parsing, if it is not yet done, and the evaluation) fails, the return value is null. The caller is responsible for converting the result into the correct type. @return the result of the expression if successful, null otherwise. @throws Exception when the evaluation fails, exception is thrown.

    parser = new ExpressionParser("var1", Double.class);
    parser.createVariable("var1", Double.class, new Double(0));
    try
    {
      //initial state
      dblResult = (Double)parser.evaluate();
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(0.0, dblResult.doubleValue());
      //set to positive value (using variable name)
      parser.set("var1", new Double(15.8));
      dblResult = (Double)parser.evaluate();

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      dblResult = (Double)parser.evaluate();
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(0.0, dblResult.doubleValue());
      //set to positive value (using variable name)
      parser.set("var1", new Double(15.8));
      dblResult = (Double)parser.evaluate();
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(15.8, dblResult.doubleValue());
      //get variable (using variable name)
      dblResult = (Double)parser.get("var1");
      Assert.assertNotNull(dblResult);

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      dblResult = (Double)parser.get("var1");
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(15.8, dblResult.doubleValue());
      //set to negative value (using index)
      parser.set(0, new Double(-19.3));
      dblResult = (Double)parser.evaluate();
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(-19.3, dblResult.doubleValue());
      //get variable (using index)
      dblResult = (Double)parser.get(0);
      Assert.assertNotNull(dblResult);

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      dblResult = (Double)parser.get(0);
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(-19.3, dblResult.doubleValue());
      //set to zero
      parser.set("var1", new Double(0));
      dblResult = (Double)parser.evaluate();
      Assert.assertNotNull(dblResult);
      Assert.assertEquals(0.0, dblResult.doubleValue());
      //set/get invalid variable name
      status = parser.set("var2", new Double(50.1));
      Assert.assertFalse(status);

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    Assert.assertEquals(false, parser.isValid());
    Assert.assertEquals(false, parser.isInitialized());
    //default to integer value
    try
    {
      intResult = (Integer)parser.evaluate();
      Assert.assertNull(intResult);
    }
    catch(Exception ex)
    {
      Assert.fail(ex.toString());

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      Assert.assertTrue(status);
      //set invalid variable name
      status = parser.set("var3", new Integer(3));
      Assert.assertFalse(status);
      //evaluate
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(6, intResult.intValue());
      //set the variable (using index)
      status = parser.set(0, new Integer(2));
      Assert.assertTrue(status);

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      Assert.assertTrue(status);
      //set invalid variable index
      status = parser.set(2, new Integer(3));
      Assert.assertFalse(status);
      //evaluate
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(9, intResult.intValue());
    }
    catch(Exception ex)
    {

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      status = parser.set("var1", Boolean.TRUE);
      Assert.assertFalse(status);
      status = parser.set("var2", Boolean.TRUE);
      Assert.assertFalse(status);
      //evaluate (false || true)
      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(true, boolResult.booleanValue());
      //set the variable (using index)
      status = parser.set(0, Boolean.TRUE);
      Assert.assertTrue(status);

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      Assert.assertTrue(status);
      //set invalid variable name
      status = parser.set(3, Boolean.TRUE);
      Assert.assertFalse(status);
      //evaluate (false || true)
      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(true, boolResult.booleanValue());
    }
    catch(Exception ex)
    {

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    //using constant-value (with space)
    parser = new ExpressionParser("1 + 5", Integer.class);
    try
    {
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(6, result.intValue());
    }
    catch(Exception ex)
    {

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