org.op4j.operators.qualities.ExtractableMapOperator Maven / Gradle / Ivy
The newest version!
/*
* =============================================================================
*
* Copyright (c) 2010, The OP4J team (http://www.op4j.org)
*
* 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.op4j.operators.qualities;
/**
*
* This interface defines methods for extracting keys (discarding values) or
* values (discarding keys) in operators holding map target objects.
*
*
* @since 1.0
*
* @author Daniel Fernández
*
*/
public interface ExtractableMapOperator {
/**
*
* Extracts only the keys of the map (discarding values) and creates an operator
* which will hold these keys as a target object of type Set.
*
*
* @return an operator with the set of keys as a target object
*/
public Operator extractKeys();
/**
*
* Extracts only the values of the map (discarding keys) and creates an operator
* which will hold these values as a target object of type List.
*
*
* @return an operator with the list of values as a target object
*/
public Operator extractValues();
}