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.


    //using constant-value (without 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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    {
      //set the variable (using variable name)
      parser.set("var1", new Integer(1));
      parser.set("var2", new Integer(5));
      //evaluate
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(6, result.intValue());
      //change one of the variable (using index)
      parser.set(1, new Integer(-7));
      //evaluate

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      Assert.assertNotNull(result);
      Assert.assertEquals(6, result.intValue());
      //change one of the variable (using index)
      parser.set(1, new Integer(-7));
      //evaluate
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(-6, result.intValue());
    }
    catch(Exception ex)
    {

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    //using constant-value (with space)
    parser = new ExpressionParser("1.2 + 5.6", Double.class);
    try
    {
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(6.8, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    //using constant-value (without space)
    parser = new ExpressionParser("1.2+5.6", Double.class);
    try
    {
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(6.8, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    {
      //set the variable (using variable name)
      parser.set("var1", new Double(1.2));
      parser.set("var2", new Double(5.6));
      //evaluate
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(6.8, round(result.doubleValue(), 1));
      //change one of the variable (using index)
      parser.set(1, new Double(-7.8));
      //evaluate

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      Assert.assertNotNull(result);
      Assert.assertEquals(6.8, round(result.doubleValue(), 1));
      //change one of the variable (using index)
      parser.set(1, new Double(-7.8));
      //evaluate
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(-6.6, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    //using constant-value (with space)
    parser = new ExpressionParser("5 - 1", Integer.class);
    try
    {
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4, result.intValue());
    }
    catch(Exception ex)
    {

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    //using constant-value (without space)
    parser = new ExpressionParser("5-1", Integer.class);
    try
    {
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4, result.intValue());
    }
    catch(Exception ex)
    {

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    {
      //set the variable (using variable name)
      parser.set("var1", new Integer(5));
      parser.set("var2", new Integer(1));
      //evaluate (5 - 1)
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4, result.intValue());
      //subtract with negative value (using index)
      parser.set(1, new Integer(-2));
      //evaluate (5 - (-2))

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