org.ros.math.CollectionMath.java Source code

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Here is the source code for org.ros.math.CollectionMath.java

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/*
 * Copyright (C) 2011 Google Inc.
 *
 * 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.ros.math;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;

import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * @author damonkohler@google.com (Damon Kohler)
 */
public class CollectionMath {

    private CollectionMath() {
        // Utility class.
    }

    public static <T extends Comparable<? super T>> T median(Collection<T> collection) {
        Preconditions.checkArgument(collection.size() > 0);
        List<T> list = Lists.newArrayList(collection);
        Collections.sort(list);
        return list.get(list.size() / 2);
    }
}