Package com.hazelcast.projection

Interface Projection<I,O>

Type Parameters:

I - input type

O - output type

All Superinterfaces:

Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Projection<I,O>
extends Serializable

Enables transforming object into other objects. Exemplary usage scenario is the project() method of the IMap

Only 1:1 transformations allowed. Use an Aggregator to perform N:1 or N:M aggregations.

      IMap<String, Employee> employees = instance.getMap("employees");

      Collection<String> names = employees.project(new Projection<Map.Entry<String,Employee>,String>(){
          @Override
          public String transform(Map.Entry<String, Employee> entry){
              return entry.getValue().getName();
          }
      });
 

Since:

3.8

Method Summary

Modifier and Type	Method	Description
O	transform(I input)	Transforms the input object into the output object.

Method Details

transform

O transform(I input)

Transforms the input object into the output object.

Parameters:

input - object.

Returns:

the output object.