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GuavaComparatorsTest.java
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/
GuavaComparatorsTest.java
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package com.justamonad.tutorials.comparator.guava;
import static java.util.Comparator.naturalOrder;
import static java.util.Comparator.reverseOrder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collector;
import org.junit.Assert;
import org.junit.Test;
import com.google.common.collect.Comparators;
public class GuavaComparatorsTest {
//
@Test
public void isInOrderTrueUsingIntegerCompare() {
List<Integer> numbers = Arrays.asList(1, 2, 2, 4);
boolean inOrder = Comparators.isInOrder(numbers, Integer::compare);
Assert.assertTrue(inOrder);
}
//
// @Test
// public void isInOrderComparatorTrue() {
// List<Integer> numbers = Arrays.asList(1, 1, 2, 3, 4);
// boolean inOrder = Comparators.isInOrder(numbers, Comparator.naturalOrder());
// Assert.assertTrue(inOrder);
// }
//
// @Test
// public void isInOrderFalse() {
// List<Integer> numbers = Arrays.asList(1, 2, 4, -1);
// boolean inOrder = Comparators.isInOrder(numbers, Integer::compare);
// Assert.assertFalse(inOrder);
// }
//
// @Test
// public void isInOrderReverseTrue() {
// List<Integer> numbers = Arrays.asList(4, 3, 3, 2, 1);
// boolean inOrder = Comparators.isInOrder(numbers, Comparator.reverseOrder());
// Assert.assertTrue(inOrder);
// }
//
// @Test
// public void isInOrdernatualReverseTrue() {
// List<Integer> numbers = Arrays.asList(1, 1, 1, 1, 1);
// boolean reverseOrder = Comparators.isInOrder(numbers, reverseOrder());
// boolean naturalOrder = Comparators.isInOrder(numbers, naturalOrder());
// Assert.assertTrue(reverseOrder == naturalOrder);
// }
//
@Test
public void isInStrictOrderComparatorTrue1() {
List<Integer> numbers = Arrays.asList(-1,-1,-1);
boolean isInStrictOrder = Comparators.isInStrictOrder(numbers, reverseOrder());
Assert.assertFalse(isInStrictOrder);
}
//
// @Test
// public void isInStrictOrderComparatorTrue2() {
// List<Integer> numbers = Arrays.asList(1, 12, 15, 19);
// boolean isInStrictOrder = Comparators.isInStrictOrder(numbers, naturalOrder());
// Assert.assertTrue(isInStrictOrder);
// }
//
// @Test
// public void lexical() {
// Comparator<Iterable<Integer>> lexical = Comparators.lexicographical(Integer::compare);
// List<List<Integer>> numbers = Arrays.asList(Arrays.asList(1, 2), Arrays.asList(2), Arrays.asList(1),
// Arrays.asList(1, 1), new ArrayList<>());
// System.out.println(numbers);
// numbers.sort(lexical);
// System.out.println(numbers);
// }
//
// @Test
// public void lexicalReversed() {
// Comparator<Iterable<Integer>> lexical = Comparators.lexicographical(Integer::compare).reversed();
// List<List<Integer>> numbers1 = Arrays.asList(Arrays.asList(1, 2), Arrays.asList(2), Arrays.asList(1),
// Arrays.asList(1, 1), new ArrayList<>());
// System.out.println(numbers1);
// numbers1.sort(lexical);
// System.out.println(numbers1);
// }
//
// @Test
// public void least() {
// Collector<Integer, ?, List<Integer>> leastCollector = Comparators.least(2, Integer::compare);
// List<Integer> numbers = Arrays.asList(5, 67, 9, 23, 6, 7);
// System.out.println(numbers);
// List<Integer> collect = numbers.stream().collect(leastCollector);
// System.out.println(collect);
// }
//
// @Test
// public void leastComparingInt() {
// Collector<String, ?, List<String>> leastCollector = Comparators.least(3,
// Comparator.comparingInt(String::length));
// List<String> words = Arrays.asList("The", "quick", "brown", "fox", "jumps", "over", "lazy", "dog");
// System.out.println(words);
// List<String> collect = words.stream().collect(leastCollector);
// System.out.println(collect);
// }
//
// @Test
// public void greatest() {
// Collector<Integer, ?, List<Integer>> greatestCollector = Comparators.greatest(2, Integer::compare);
// List<Integer> numbers = Arrays.asList(5, 67, 9, 23, 6, 7);
// System.out.println(numbers);
// List<Integer> collect = numbers.stream().collect(greatestCollector);
// System.out.println(collect);
// }
//
// @Test
// public void greatestComparingInt() {
// Collector<String, ?, List<String>> greatestCollector = Comparators.greatest(3,
// Comparator.comparingInt(String::length));
// List<String> words = Arrays.asList("The", "quick", "brown", "fox", "jumps", "over", "lazy", "dog");
// System.out.println(words);
// List<String> collect = words.stream().collect(greatestCollector);
// System.out.println(collect);
// }
//
// @Test
// public void emptiesFirst() {
// List<Optional<Integer>> numbers = Arrays.asList(Optional.of(5), Optional.of(67), Optional.of(9),
// Optional.empty(), Optional.of(23), Optional.of(6), Optional.empty(), Optional.of(7), Optional.empty());
// System.out.println(numbers);
// Comparator<Optional<Integer>> emptiesFirst = Comparators.emptiesFirst(Integer::compare);
// numbers.sort(emptiesFirst);
// System.out.println(numbers);
// }
//
// @Test
// public void emptiesFirstReversed() {
// List<Optional<Integer>> numbers = Arrays.asList(Optional.of(5), Optional.of(67), Optional.of(9),
// Optional.empty(), Optional.of(23), Optional.of(6), Optional.empty(), Optional.of(7), Optional.empty());
// System.out.println(numbers);
// Comparator<Optional<Integer>> emptiesFirst = Comparators.emptiesFirst(Integer::compare).reversed();
// numbers.sort(emptiesFirst);
// System.out.println(numbers);
// }
//
// @Test
// public void emptiesLast() {
// List<Optional<Integer>> numbers = Arrays.asList(Optional.of(5), Optional.of(67), Optional.of(9),
// Optional.empty(), Optional.of(23), Optional.of(6), Optional.empty(), Optional.of(7), Optional.empty());
// Comparator<Optional<Integer>> emptiesFirst = Comparators.emptiesLast(Integer::compare);
// numbers.sort(emptiesFirst);
// System.out.println(numbers);
// }
//
// @Test
// public void emptiesLastString() {
// List<Optional<String>> names = Arrays.asList(Optional.of("Jon"), Optional.of("Arya"), Optional.of("Sansa"),
// Optional.empty(), Optional.of("Robb"), Optional.of("Bran"), Optional.empty(), Optional.of("Rickon"),
// Optional.empty());
// Comparator<Optional<String>> emptiesLast = Comparators.emptiesLast(String::compareTo);
// System.out.println(names);
// names.sort(emptiesLast);
// System.out.println(names);
// }
//
}