org.onebusaway.collections.Min Maven / Gradle / Ivy

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/**
 * Copyright (C) 2011 Brian Ferris 
 *
 * 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.onebusaway.collections;

import java.util.ArrayList;
import java.util.List;

public class Min {

    private double _minValue = Double.POSITIVE_INFINITY;

    private List _minElements = new ArrayList();

    public void add(double value, T element) {
        if (value == _minValue) {
            _minElements.add(element);
        } else if (value < _minValue) {
            _minElements.clear();
            _minElements.add(element);
            _minValue = value;
        }
    }

    public boolean isEmpty() {
        return _minElements.isEmpty();
    }

    public double getMinValue() {
        return _minValue;
    }

    public T getMinElement() {
        if (_minElements.isEmpty())
            return null;
        return _minElements.get(0);
    }

    public List getMinElements() {
        return _minElements;
    }

}