com.hazelcast.mapreduce.aggregation

## Interface PropertyExtractor<ValueIn,ValueOut>

- Type Parameters:
    `ValueIn` - the input value type
    `ValueOut` - the extracted / transformed value type
  All Superinterfaces:
    Serializable

  Deprecated.
  Use fast-aggregations `Aggregator`

      @Deprecated
      public interface PropertyExtractor<ValueIn,ValueOut>
      extends Serializable

  The PropertyExtractor interface is used in suppliers to retrieve values from input value types and extract or transform them to some other type to be used in aggregations.

  For Java 6 and 7:

       public class EmployeeIntTransformer implements PropertyExtractor<Employee, Integer> {
         public Integer extract(Employee value) {
             return value.getSalaryPerMonth();
         }
       }

       Supplier supplier = Supplier.all(new EmployeeIntTransformer());

  Or in Java 8:

       Supplier supplier = Supplier.all((value) -> value.getSalaryPerMonth());

  Since:
    3.3

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `ValueOut` | `extract(ValueIn value)` Deprecated. This method is called for every value that is about to be supplied to an aggregation (maybe filtered through an `Predicate` or `KeyPredicate`).

- - ### Method Detail

    - #### extract

          ValueOut extract(ValueIn value)

      Deprecated.
      This method is called for every value that is about to be supplied to an aggregation (maybe filtered through an `Predicate` or `KeyPredicate`). It is responsible to either transform the input value to a type of `ValueOut` or to extract an attribute of this type.
      Parameters:
        `value` - the input value
      Returns:
        the extracted / transformed value

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