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Provides common utility functions
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/*
* Copyright (c) CQSE GmbH
*
* 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.conqat.lib.commons.math;
import java.util.Collection;
/**
* Aggregtor interface.
*
* @author deissenb
*/
public interface IAggregator {
/**
* Aggregate collection of values to one value. Implementing classes may return non-normal numbers,
* e.g. {@link Double#NaN} for the median of an empty collections.
*/
public double aggregate(Collection values);
/**
* Get the neutral element of this aggregation operator. This may return non-normal numbers, e.g.
* {@link Double#NaN} or {@link Double#POSITIVE_INFINITY} .
*/
public double getNeutralElement();
}