Get the value of the 95th percentile using nearest rank algorithm. - Android java.util

Android examples for java.util:Collection

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Description

Get the value of the 95th percentile using nearest rank algorithm.

Demo Code

/*// w w w .j av  a2 s.  co m
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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 com.java2s;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class Main {
    /**
     * Get the value of the 95th percentile using nearest rank algorithm.
     *
     * @throws IllegalArgumentException if the collection is null or empty
     */
    public static <TValue extends Comparable<? super TValue>> TValue get95PercentileValue(
            Collection<TValue> collection) {
        validateCollection(collection);

        List<TValue> arrayCopy = new ArrayList<TValue>(collection);
        Collections.sort(arrayCopy);

        // zero-based array index
        int arrayIndex = (int) Math.round(arrayCopy.size() * 0.95 + .5) - 1;

        return arrayCopy.get(arrayIndex);
    }

    /**
     * Validate that a collection is not null or empty.
     *
     * @throws IllegalStateException if collection is null or empty.
     */
    private static <T> void validateCollection(Collection<T> collection) {
        if (collection == null || collection.size() == 0) {
            throw new IllegalStateException(
                    "Collection cannot be null or empty");
        }
    }
}

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