Examples of org.apache.pig.FilterFunc.exec()

org.apache.pig.FilterFunc.exec()
This callback method must be implemented by all subclasses. This is the method that will be invoked on every Tuple of a given dataset. Since the dataset may be divided up in a variety of ways the programmer should not make assumptions about state that is maintained between invocations of this method. @param input the Tuple to be processed. @throws IOException

        
        
        EvalFunc<DataAtom> count = new COUNT();
        FilterFunc isEmpty = new IsEmpty();
        
        assertTrue(isEmpty.exec(tup));
        count.exec(tup,output);
        assertTrue(output.numval() == 0);
        
        map.put("a", new DataAtom("a"));

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        count.exec(tup,output);
        assertTrue(output.numval() == 0);
        
        map.put("a", new DataAtom("a"));


        assertFalse(isEmpty.exec(tup));
        count.exec(tup,output);
        assertTrue(output.numval() == 1);


        
        map.put("b", new Tuple());

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        assertTrue(output.numval() == 1);


        
        map.put("b", new Tuple());


        assertFalse(isEmpty.exec(tup));
        count.exec(tup,output);
        assertTrue(output.numval() == 2);
        
    }

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