| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.jackrabbit.oak.query; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.Random; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.junit.Test; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Tests the filtering iterators. |
| */ |
| public class IteratorsTest { |
| |
| private QueryEngineSettings settings = new QueryEngineSettings(); |
| |
| private static final Comparator<Integer> INT_COMP = new Comparator<Integer>() { |
| |
| @Override |
| public int compare(Integer o1, Integer o2) { |
| return o1.compareTo(o2); |
| } |
| |
| }; |
| |
| @Test |
| public void distinct() { |
| assertEquals("", toString(FilterIterators.newDistinct(it(), settings))); |
| assertEquals("1", toString(FilterIterators.newDistinct(it(1), settings))); |
| assertEquals("1, 2", toString(FilterIterators.newDistinct(it(1, 2), settings))); |
| assertEquals("1, 2, 3", toString(FilterIterators.newDistinct(it(1, 2, 1, 3, 3, 1), settings))); |
| } |
| |
| @Test |
| public void limit() { |
| assertEquals("", toString(FilterIterators.newLimit(it(), 0))); |
| assertEquals("", toString(FilterIterators.newLimit(it(), 1))); |
| assertEquals("", toString(FilterIterators.newLimit(it(), 10))); |
| assertEquals("", toString(FilterIterators.newLimit(it(1), 0))); |
| assertEquals("1", toString(FilterIterators.newLimit(it(1), 1))); |
| assertEquals("1", toString(FilterIterators.newLimit(it(1), 10))); |
| assertEquals("", toString(FilterIterators.newLimit(it(1, 2), 0))); |
| assertEquals("1", toString(FilterIterators.newLimit(it(1, 2), 1))); |
| assertEquals("1, 2", toString(FilterIterators.newLimit(it(1, 2), 10))); |
| assertEquals("1", toString(FilterIterators.newLimit(it(1, 2, 3), 1))); |
| assertEquals("1, 2", toString(FilterIterators.newLimit(it(1, 2, 3), 2))); |
| assertEquals("1, 2, 3", toString(FilterIterators.newLimit(it(1, 2, 3), 3))); |
| assertEquals("1, 2, 3", toString(FilterIterators.newLimit(it(1, 2, 3), 4))); |
| } |
| |
| @Test |
| public void offset() { |
| assertEquals("", toString(FilterIterators.newOffset(it(), 0))); |
| assertEquals("1", toString(FilterIterators.newOffset(it(1), 0))); |
| assertEquals("1, 2", toString(FilterIterators.newOffset(it(1, 2), 0))); |
| assertEquals("", toString(FilterIterators.newOffset(it(), 1))); |
| assertEquals("", toString(FilterIterators.newOffset(it(1), 1))); |
| assertEquals("2", toString(FilterIterators.newOffset(it(1, 2), 1))); |
| assertEquals("", toString(FilterIterators.newOffset(it(1, 2), 2))); |
| assertEquals("", toString(FilterIterators.newOffset(it(1, 2), 3))); |
| assertEquals("2, 3", toString(FilterIterators.newOffset(it(1, 2, 3), 1))); |
| } |
| |
| @Test |
| public void sort() { |
| assertEquals("", toString(FilterIterators.newSort(it(new Integer[]{}), INT_COMP, 0, settings))); |
| assertEquals("", toString(FilterIterators.newSort(it(1), INT_COMP, 0, settings))); |
| assertEquals("1", toString(FilterIterators.newSort(it(1), INT_COMP, 1, settings))); |
| assertEquals("1", toString(FilterIterators.newSort(it(1), INT_COMP, 2, settings))); |
| assertEquals("1", toString(FilterIterators.newSort(it(1, 2), INT_COMP, 1, settings))); |
| assertEquals("1", toString(FilterIterators.newSort(it(2, 1), INT_COMP, 1, settings))); |
| assertEquals("1, 2", toString(FilterIterators.newSort(it(1, 2, 3), INT_COMP, 2, settings))); |
| assertEquals("1, 2", toString(FilterIterators.newSort(it(3, 2, 1), INT_COMP, 2, settings))); |
| assertEquals("1, 1, 2", toString(FilterIterators.newSort(it(3, 3, 2, 1, 1), INT_COMP, 3, settings))); |
| } |
| |
| @Test |
| public void sortCompareCalls() { |
| sortCompareCalls(10000, 0); |
| sortCompareCalls(10000, 1); |
| sortCompareCalls(10000, 10); |
| sortCompareCalls(10000, 100); |
| sortCompareCalls(10000, 1000); |
| sortCompareCalls(10000, 10000); |
| sortCompareCalls(10000, 100000); |
| sortCompareCalls(10000, 1000000); |
| sortCompareCalls(10000, Integer.MAX_VALUE); |
| } |
| |
| private void sortCompareCalls(int count, int keep) { |
| |
| int len = 1000; |
| Random r = new Random(1); |
| Integer[] list = new Integer[len]; |
| for (int i = 0; i < len; i++) { |
| list[i] = r.nextInt(); |
| } |
| final AtomicInteger compareCalls = new AtomicInteger(); |
| Comparator<Integer> comp = new Comparator<Integer>() { |
| |
| @Override |
| public int compare(Integer o1, Integer o2) { |
| compareCalls.incrementAndGet(); |
| return o1.compareTo(o2); |
| } |
| |
| }; |
| Iterator<Integer> it = FilterIterators.newSort(it(list), comp, keep, settings); |
| int old = Integer.MIN_VALUE; |
| while (it.hasNext()) { |
| int x = it.next(); |
| assertTrue(x >= old); |
| old = x; |
| } |
| // n * log2(n) |
| int maxCompAll = (int) (len * Math.log(len) / Math.log(2)); |
| int maxCompKeep = (int) (len * Math.log(3.0 * keep) / Math.log(2)); |
| int maxComp = Math.min(maxCompAll, Math.max(0, maxCompKeep)); |
| assertTrue(compareCalls.get() <= maxComp); |
| } |
| |
| @Test |
| public void combined() { |
| |
| // no filtering |
| assertEquals("3, 3, 2, 1", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), false, Long.MAX_VALUE, 0, null, settings))); |
| |
| // distinct |
| assertEquals("3, 2, 1", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), true, Long.MAX_VALUE, 0, null, settings))); |
| |
| // order by |
| assertEquals("1, 2, 3, 3", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), false, Long.MAX_VALUE, 0, INT_COMP, settings))); |
| |
| // distinct & order by |
| assertEquals("1, 2, 3", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), true, Long.MAX_VALUE, 0, INT_COMP, settings))); |
| |
| // limit |
| assertEquals("3, 3", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), false, 2, 0, null, settings))); |
| |
| // offset |
| assertEquals("3, 2, 1", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), false, Long.MAX_VALUE, 1, null, settings))); |
| |
| // limit & offset |
| assertEquals("3, 2", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), false, 2, 1, null, settings))); |
| |
| // distinct & limit & offset |
| assertEquals("2, 1", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), true, 2, 1, null, settings))); |
| |
| // distinct & limit & offset & order by |
| assertEquals("2, 3", |
| toString(FilterIterators.newCombinedFilter( |
| it(3, 3, 2, 1), true, 2, 1, INT_COMP, settings))); |
| |
| } |
| |
| private static <K> Iterator<K> it(K... x) { |
| return Collections.unmodifiableCollection(Lists.newArrayList(x)).iterator(); |
| } |
| |
| private static <K> String toString(Iterator<K> it) { |
| StringBuilder buff = new StringBuilder(); |
| while (it.hasNext()) { |
| if (buff.length() > 0) { |
| buff.append(", "); |
| } |
| assertTrue(it.hasNext()); |
| buff.append(it.next()); |
| } |
| assertFalse(it.hasNext()); |
| try { |
| it.remove(); |
| fail(); |
| } catch (UnsupportedOperationException e) { |
| // expected |
| } |
| try { |
| it.next(); |
| fail(); |
| } catch (NoSuchElementException e) { |
| // expected |
| } |
| return buff.toString(); |
| } |
| |
| } |