/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package benchmarks.regression;
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import com.google.caliper.Param;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Random;
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import java.util.Vector;
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public class CollectionsBenchmark {
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@Param({"4", "16", "64", "256", "1024"})
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private int arrayListLength;
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public static Comparator<Integer> REVERSE = new Comparator<Integer>() {
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@Override
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public int compare(Integer lhs, Integer rhs) {
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int lhsAsInt = lhs.intValue();
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int rhsAsInt = rhs.intValue();
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return rhsAsInt < lhsAsInt ? -1 : (lhsAsInt == rhsAsInt ? 0 : 1);
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}
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};
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public void timeSort_arrayList(int nreps) throws Exception {
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List<Integer> input = buildList(arrayListLength, ArrayList.class);
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for (int i = 0; i < nreps; ++i) {
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Collections.sort(input);
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}
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}
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public void timeSortWithComparator_arrayList(int nreps) throws Exception {
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List<Integer> input = buildList(arrayListLength, ArrayList.class);
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for (int i = 0; i < nreps; ++i) {
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Collections.sort(input, REVERSE);
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}
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}
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public void timeSort_vector(int nreps) throws Exception {
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List<Integer> input = buildList(arrayListLength, Vector.class);
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for (int i = 0; i < nreps; ++i) {
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Collections.sort(input);
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}
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}
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public void timeSortWithComparator_vector(int nreps) throws Exception {
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List<Integer> input = buildList(arrayListLength, Vector.class);
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for (int i = 0; i < nreps; ++i) {
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Collections.sort(input, REVERSE);
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}
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}
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private static <T extends List<Integer>> List<Integer> buildList(
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int arrayListLength, Class<T> listClass) throws Exception {
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Random random = new Random();
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random.setSeed(0);
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List<Integer> list = listClass.newInstance();
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for (int i = 0; i < arrayListLength; ++i) {
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list.add(random.nextInt());
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}
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return list;
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}
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}
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