// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.func;
/**
* A reducer takes an accumulator value and a single value from a collection and computes a new
* accumulator value.
*
* @param A type of accumulator
* @param T type of collection value
*
* @since 5.2.0
*/
public interface Reducer<A, T>
{
/**
* Run a computation using the current value of the accumulator and an element (from a Flow),
* and return the new accumulator.
*/
A reduce(A accumulator, T element);
}