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.

      strResult = (String)parser.evaluate();
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.isEmpty());
      //set to value (using variable name)
      parser.set("var1", "some-string");
      strResult = (String)parser.evaluate();
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.compareTo("some-string") == 0);
      //get variable (using variable name)
      strResult = (String)parser.get("var1");
      Assert.assertNotNull(strResult);

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      strResult = (String)parser.get("var1");
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.compareTo("some-string") == 0);
      //set to another value (using index)
      parser.set(0, "different string");
      strResult = (String)parser.evaluate();
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.compareTo("different string") == 0);
      //get variable (using variable name)
      strResult = (String)parser.get(0);
      Assert.assertNotNull(strResult);

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      strResult = (String)parser.get(0);
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.compareTo("different string") == 0);
      //set to empty string
      parser.set("var1", "");
      strResult = (String)parser.evaluate();
      Assert.assertNotNull(strResult);
      Assert.assertTrue(strResult.isEmpty());
      //set/get invalid variable name
      status = parser.set("var2", "string1");
      Assert.assertFalse(status);

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    parser = new ExpressionParser("var1", Boolean.class);
    parser.createVariable("var1", Boolean.class, Boolean.FALSE);
    try
    {
      //initial state
      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(false, boolResult.booleanValue());
      //set to true (using variable name)
      parser.set("var1", Boolean.TRUE);
      boolResult = (Boolean)parser.evaluate();

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      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(false, boolResult.booleanValue());
      //set to true (using variable name)
      parser.set("var1", Boolean.TRUE);
      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(true, boolResult.booleanValue());
      //get variable (using variable name)
      boolResult = (Boolean)parser.get("var1");
      Assert.assertNotNull(boolResult);

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      boolResult = (Boolean)parser.get("var1");
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(true, boolResult.booleanValue());
      //set to false (using index)
      parser.set(0, Boolean.FALSE);
      boolResult = (Boolean)parser.evaluate();
      Assert.assertNotNull(boolResult);
      Assert.assertEquals(false, boolResult.booleanValue());
      //get variable (using index)
      boolResult = (Boolean)parser.get(0);
      Assert.assertNotNull(boolResult);

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    parser = new ExpressionParser("var1", Integer.class);
    parser.createVariable("var1", Integer.class, new Integer(0));
    try
    {
      //initial state
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(0, intResult.intValue());
      //set to positive value (using variable name)
      parser.set("var1", new Integer(15));
      intResult = (Integer)parser.evaluate();

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      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(0, intResult.intValue());
      //set to positive value (using variable name)
      parser.set("var1", new Integer(15));
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(15, intResult.intValue());
      //get variable (using variable name)
      intResult = (Integer)parser.get("var1");
      Assert.assertNotNull(intResult);

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      intResult = (Integer)parser.get("var1");
      Assert.assertNotNull(intResult);
      Assert.assertEquals(15, intResult.intValue());
      //set to negative value (using index)
      parser.set(0, new Integer(-19));
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(-19, intResult.intValue());
      //get variable (using index)
      intResult = (Integer)parser.get(0);
      Assert.assertNotNull(intResult);

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      intResult = (Integer)parser.get(0);
      Assert.assertNotNull(intResult);
      Assert.assertEquals(-19, intResult.intValue());
      //set to zero
      parser.set("var1", new Integer(0));
      intResult = (Integer)parser.evaluate();
      Assert.assertNotNull(intResult);
      Assert.assertEquals(0, intResult.intValue());
      //set/get invalid variable name
      status = parser.set("var2", new Integer(50));
      Assert.assertFalse(status);

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