Package com.hazelcast.aggregation

Class Aggregators

java.lang.Object
com.hazelcast.aggregation.Aggregators
public final class Aggregators extends Object
A utility class to create basic Aggregator instances.

Min/Max/Average aggregators are type specific, so an integerAvg() aggregator expects all elements to be integers. There is no conversion executed while accumulating, so if there is any other type met an exception will be thrown.

In order to operate on a generic Number type use the fixedPointSum(), floatingPointSum() and numberAvg() aggregators. All of them will convert the given number to either Long or Double during the accumulation phase. It will result in a lot of allocations since each number has to be converted, but it enables the user to operate on the whole family of numbers. It is especially useful if the numbers given to the aggregators may not be of one type only.

The attributePath given in the factory method allows the aggregator to operate on the value extracted by navigating to the given attributePath on each object that has been returned from a query. The attribute path may be simple, e.g. "name", or nested "address.city".

If an aggregator does not accept null values pass a predicate to the aggregate call that will filter them out.

If the input value or the extracted value is a collection it won't be "unfolded" - so for example count aggregation on "person.postalCodes" will return 1 for each input object and not the size of the collection. In order to calculate the size of the collection use the [any] operator, e.g. "person.postalCodes[any]".

Since:
3.8

  • Method Details

    • count

      public static <I> Aggregator<I,Long> count()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that counts the input values. Accepts nulls as input values. Aggregation result type Long.

    • count

      public static <I> Aggregator<I,Long> count(String attributePath)
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that counts the input values extracted from the given attributePath. Accepts null input values and null extracted values. Aggregation result type Long.

    • distinct

      public static <I, R> Aggregator<I,Set<R>> distinct()
      Type Parameters:
      I - type of the input object.
      R - type of the return object.
      Returns:
      an aggregator that calculates the distinct set of input values. Accepts null input values. Aggregation result type is a Set of R.

    • distinct

      public static <I, R> Aggregator<I,Set<R>> distinct(String attributePath)
      Type Parameters:
      I - type of the input object.
      R - type of the return object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the distinct set of input values extracted from the given attributePath. Accepts null input values and null extracted values. Aggregation result type is a Set of R.

    • bigDecimalAvg

      public static <I> Aggregator<I,BigDecimal> bigDecimalAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigDecimalAvg

      public static <I> Aggregator<I,BigDecimal> bigDecimalAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigIntegerAvg

      public static <I> Aggregator<I,BigDecimal> bigIntegerAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts only BigInteger input values. Aggregation result type is BigDecimal.

    • bigIntegerAvg

      public static <I> Aggregator<I,BigDecimal> bigIntegerAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only BigInteger input values. Aggregation result type is BigDecimal.

    • doubleAvg

      public static <I> Aggregator<I,Double> doubleAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • doubleAvg

      public static <I> Aggregator<I,Double> doubleAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • integerAvg

      public static <I> Aggregator<I,Double> integerAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Double.

    • integerAvg

      public static <I> Aggregator<I,Double> integerAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Double.

    • longAvg

      public static <I> Aggregator<I,Double> longAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts only Long input values (primitive and boxed). Aggregation result type is Double.

    • longAvg

      public static <I> Aggregator<I,Double> longAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only Long input values (primitive and boxed). Aggregation result type is Double.

    • numberAvg

      public static <I> Aggregator<I,Double> numberAvg()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the average of the input values. Does NOT accept null input values. Accepts generic Number input values. Aggregation result type is Double.

    • numberAvg

      public static <I> Aggregator<I,Double> numberAvg(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the average of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts generic Number input values. Aggregation result type is Double.

    • bigDecimalMax

      public static <I> Aggregator<I,BigDecimal> bigDecimalMax()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigDecimalMax

      public static <I> Aggregator<I,BigDecimal> bigDecimalMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigIntegerMax

      public static <I> Aggregator<I,BigInteger> bigIntegerMax()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values and null extracted values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • bigIntegerMax

      public static <I> Aggregator<I,BigInteger> bigIntegerMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values nor null extracted values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • doubleMax

      public static <I> Aggregator<I,Double> doubleMax()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values and null extracted values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • doubleMax

      public static <I> Aggregator<I,Double> doubleMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • integerMax

      public static <I> Aggregator<I,Integer> integerMax()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Integer.

    • integerMax

      public static <I> Aggregator<I,Integer> integerMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Integer.

    • longMax

      public static <I> Aggregator<I,Long> longMax()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • longMax

      public static <I> Aggregator<I,Long> longMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • comparableMax

      public static <I, R extends Comparable> Aggregator<I,R> comparableMax()
      Type Parameters:
      I - type of the input object.
      R - type of the return object (subtype of Comparable)
      Returns:
      an aggregator that calculates the max of the input values. Accepts null input values. Accepts generic Comparable input values. Aggregation result type is R.

    • comparableMax

      public static <I, R extends Comparable> Aggregator<I,R> comparableMax(String attributePath)
      Type Parameters:
      I - type of the input object.
      R - type of the return object (subtype of Comparable)
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts generic Comparable input values. Aggregation result type is R.

    • maxBy

      public static <I> Aggregator<I,I> maxBy(String attributePath)
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the max of the input values extracted from the given attributePath and returns the input item containing the maximum value. If multiple items contain the maximum value, any of them is returned. Accepts null input values and null extracted values. Accepts generic Comparable input values.

    • bigDecimalMin

      public static <I> Aggregator<I,BigDecimal> bigDecimalMin()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values and null extracted values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigDecimalMin

      public static <I> Aggregator<I,BigDecimal> bigDecimalMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigIntegerMin

      public static <I> Aggregator<I,BigInteger> bigIntegerMin()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values and null extracted values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • bigIntegerMin

      public static <I> Aggregator<I,BigInteger> bigIntegerMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • doubleMin

      public static <I> Aggregator<I,Double> doubleMin()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values and null extracted values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • doubleMin

      public static <I> Aggregator<I,Double> doubleMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • integerMin

      public static <I> Aggregator<I,Integer> integerMin()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values and null extracted values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Integer.

    • integerMin

      public static <I> Aggregator<I,Integer> integerMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Integer.

    • longMin

      public static <I> Aggregator<I,Long> longMin()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values and null extracted values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • longMin

      public static <I> Aggregator<I,Long> longMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • comparableMin

      public static <I, R extends Comparable> Aggregator<I,R> comparableMin()
      Type Parameters:
      I - type of the input object.
      R - type of the return object (subtype of Comparable)
      Returns:
      an aggregator that calculates the min of the input values. Accepts null input values. Accepts generic Comparable input values. Aggregation result type is R.

    • comparableMin

      public static <I, R extends Comparable> Aggregator<I,R> comparableMin(String attributePath)
      Type Parameters:
      I - type of the input object.
      R - type of the return object (subtype of Comparable)
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath. Accepts null input values and null extracted values. Accepts generic Comparable input values. Aggregation result type is R.

    • minBy

      public static <I> Aggregator<I,I> minBy(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the min of the input values extracted from the given attributePath and returns the input item containing the minimum value. If multiple items contain the minimum value, any of them is returned. Accepts null input values and null extracted values. Accepts generic Comparable input values.

    • bigDecimalSum

      public static <I> Aggregator<I,BigDecimal> bigDecimalSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigDecimalSum

      public static <I> Aggregator<I,BigDecimal> bigDecimalSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only BigDecimal input values. Aggregation result type is BigDecimal.

    • bigIntegerSum

      public static <I> Aggregator<I,BigInteger> bigIntegerSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • bigIntegerSum

      public static <I> Aggregator<I,BigInteger> bigIntegerSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values nor null extracted values. Accepts only BigInteger input values. Aggregation result type is BigInteger.

    • doubleSum

      public static <I> Aggregator<I,Double> doubleSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • doubleSum

      public static <I> Aggregator<I,Double> doubleSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values. Accepts only Double input values (primitive and boxed). Aggregation result type is Double.

    • integerSum

      public static <I> Aggregator<I,Long> integerSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Long.

    • integerSum

      public static <I> Aggregator<I,Long> integerSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values. Accepts only Integer input values (primitive and boxed). Aggregation result type is Long.

    • longSum

      public static <I> Aggregator<I,Long> longSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • longSum

      public static <I> Aggregator<I,Long> longSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values. Accepts only Long input values (primitive and boxed). Aggregation result type is Long.

    • fixedPointSum

      public static <I> Aggregator<I,Long> fixedPointSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts generic Number input values. Aggregation result type is Long.

    • fixedPointSum

      public static <I> Aggregator<I,Long> fixedPointSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values. Accepts generic Number input values. Aggregation result type is Long.

    • floatingPointSum

      public static <I> Aggregator<I,Double> floatingPointSum()
      Type Parameters:
      I - type of the input object.
      Returns:
      an aggregator that calculates the sum of the input values. Does NOT accept null input values. Accepts generic Number input values. Aggregation result type is Double.

    • floatingPointSum

      public static <I> Aggregator<I,Double> floatingPointSum(String attributePath)
      Type Parameters:
      I - type of the input object.
      Parameters:
      attributePath - the attribute path
      Returns:
      an aggregator that calculates the sum of the input values extracted from the given attributePath. Does NOT accept null input values. Accepts generic Number input values. Aggregation result type is Double.