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The Java Embedded Aggregator Classes RealSumAggregate and IntegerSumAggregate

RealSumAggregate implements the sum aggregation for real numbers (as double precision values) and IntegerSumAggregate implements the sum aggregation for integers (as longs).

For an overview see page Java Aggregator Class

Class Definitions

Sum aggregate for real values

 
    public static class RealSumAggregate implements Aggregate<Number>
    {
        public void initialize(Number val) 
        {
            sum = val.doubleValue();
        }
 
        public void accumulate(Number val) 
        {
            sum += val.doubleValue();
        }
 
        public Object result() 
        {
            return new Double(sum);
        }
         
        public void merge(Aggregate<Number> other) 
        {
            sum += ((RealSumAggregate)other).sum;
        }
 
        double sum;
    }

IntegerSumAggregate

Sum aggregate for integer values:

 
    public static class IntegerSumAggregate implements Aggregate<Number>
    {
        public void initialize(Number val) 
        {
            sum = val.longValue();
        }
 
        public void accumulate(Number val) 
        {
            sum += val.longValue();
        }
         
        public Object result() 
        {
            return new Long(sum);
        }
 
        public void merge(Aggregate<Number> other) 
        {
            sum += ((IntegerSumAggregate)other).sum;
        }
 
        long sum;
    }