brooklyn-server/core/src/main/java/org/apache/brooklyn/enricher/stock/CustomAggregatingEnricher.java [294:310]:
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    private static <N extends Number> N sum(Iterable<? extends Number> vals, Number valueIfNull, Number valueIfNone, TypeToken<N> type) {
        double result = 0d;
        int count = 0;
        if (vals!=null) {
            for (Number val : vals) { 
                if (val!=null) {
                    result += val.doubleValue();
                    count++;
                } else if (valueIfNull!=null) {
                    result += valueIfNull.doubleValue();
                    count++;
                }
            }
        }
        if (count==0) return cast(valueIfNone, type);
        return cast(result, type);
    }
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brooklyn-server/core/src/main/java/org/apache/brooklyn/enricher/stock/Enrichers.java [869:885]:
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    public static <N extends Number> N sum(Iterable<? extends Number> vals, Number valueIfNull, Number valueIfNone, TypeToken<N> type) {
        double result = 0d;
        int count = 0;
        if (vals!=null) {
            for (Number val : vals) { 
                if (val!=null) {
                    result += val.doubleValue();
                    count++;
                } else if (valueIfNull!=null) {
                    result += valueIfNull.doubleValue();
                    count++;
                }
            }
        }
        if (count==0) return cast(valueIfNone, type);
        return cast(result, type);
    }
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