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.

      Assert.assertNotNull(result);
      Assert.assertEquals(4, result.intValue());
      //subtract with negative value (using index)
      parser.set(1, new Integer(-2));
      //evaluate (5 - (-2))
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(7, result.intValue());
      //subtract from negative value (using index)
      parser.set(0, new Integer(-5));
      //evaluate (-5 - (-2)

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      Assert.assertNotNull(result);
      Assert.assertEquals(7, result.intValue());
      //subtract from negative value (using index)
      parser.set(0, new Integer(-5));
      //evaluate (-5 - (-2)
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(-3, result.intValue());
    }
    catch(Exception ex)
    {

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    //using constant-value (with space)
    parser = new ExpressionParser("5.6 - 1.2", Double.class);
    try
    {
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4.4, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    //using constant-value (without space)
    parser = new ExpressionParser("5.6-1.2", Double.class);
    try
    {
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4.4, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    {
      //set the variable (using variable name)
      parser.set("var1", new Double(5.6));
      parser.set("var2", new Double(1.2));
      //evaluate (5.6 - 1.2)
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(4.4, round(result.doubleValue(), 1));
      //subtract with negative value (using index)
      parser.set(1, new Double(-2.3));
      //evaluate (5.6 - (-2.3))

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      Assert.assertNotNull(result);
      Assert.assertEquals(4.4, round(result.doubleValue(), 1));
      //subtract with negative value (using index)
      parser.set(1, new Double(-2.3));
      //evaluate (5.6 - (-2.3))
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(7.9, round(result.doubleValue(), 1));
      //subtract from negative value (using index)
      parser.set(0, new Double(-6.7));
      //evaluate (-6.7 - (-2.3))

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      Assert.assertNotNull(result);
      Assert.assertEquals(7.9, round(result.doubleValue(), 1));
      //subtract from negative value (using index)
      parser.set(0, new Double(-6.7));
      //evaluate (-6.7 - (-2.3))
      result = (Double)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(-4.4, round(result.doubleValue(), 1));
    }
    catch(Exception ex)
    {

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    //using constant-value (with space)
    parser = new ExpressionParser("5 * 2", Integer.class);
    try
    {
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(10, result.intValue());
    }
    catch(Exception ex)
    {

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    //using constant-value (without space)
    parser = new ExpressionParser("5*2", Integer.class);
    try
    {
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(10, result.intValue());
    }
    catch(Exception ex)
    {

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    try
    {
      //evaluate (5 * 2)
      parser.set("var1", new Integer(5));
      parser.set("var2", new Integer(2));
      result = (Integer)parser.evaluate();
      Assert.assertNotNull(result);
      Assert.assertEquals(10, result.intValue());
      //evaluate (3 * -4)
      parser.set(0, new Integer(3));
      parser.set(1, new Integer(-4));

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