| 1 | package com.reallifedeveloper.tools.test.database.inmemory; | |
| 2 | ||
| 3 | import java.util.ArrayList; | |
| 4 | import java.util.Collections; | |
| 5 | import java.util.Comparator; | |
| 6 | import java.util.List; | |
| 7 | ||
| 8 | import org.checkerframework.checker.nullness.qual.Nullable; | |
| 9 | import org.springframework.data.domain.Sort; | |
| 10 | import org.springframework.data.domain.Sort.NullHandling; | |
| 11 | import org.springframework.data.domain.Sort.Order; | |
| 12 | ||
| 13 | import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; | |
| 14 | import lombok.AllArgsConstructor; | |
| 15 | ||
| 16 | import com.reallifedeveloper.tools.test.TestUtil; | |
| 17 | ||
| 18 | /** | |
| 19 | * A helper class to assist with sorting lists in accordance with {@code org.springframework.data.domain.Sort} instances. | |
| 20 | * | |
| 21 | * @author RealLifeDeveloper | |
| 22 | */ | |
| 23 | public final class SortUtil { | |
| 24 | ||
| 25 | /** | |
| 26 | * Since this is a utility class that should not be instantiated, we hide the only constructor. | |
| 27 | */ | |
| 28 | private SortUtil() { | |
| 29 | } | |
| 30 | ||
| 31 | /** | |
| 32 | * Sorts the given list according to the sort definition provided. | |
| 33 | * | |
| 34 | * @param <T> the type of elements in the list | |
| 35 | * @param items the list of items to sort | |
| 36 | * @param sort the {@code org.springframework.data.domain.Sort} instance defining how the list should be sorted | |
| 37 | * | |
| 38 | * @return a copy of {@code items}, sorted according to {@code sort} | |
| 39 | */ | |
| 40 | public static <T> List<T> sort(List<T> items, Sort sort) { | |
| 41 | List<T> sortedItems = new ArrayList<>(items); | |
| 42 | // We reverse the Order instances so that we sort by the least important first and the most important last. | |
| 43 | List<Order> orders = reverseOrders(sort); | |
| 44 | for (Order order : orders) { | |
| 45 |
1
1. sort : removed call to com/reallifedeveloper/tools/test/database/inmemory/SortUtil::sort → KILLED |
sort(sortedItems, order); |
| 46 | } | |
| 47 |
1
1. sort : replaced return value with Collections.emptyList for com/reallifedeveloper/tools/test/database/inmemory/SortUtil::sort → KILLED |
return sortedItems; |
| 48 | } | |
| 49 | ||
| 50 | private static List<Order> reverseOrders(Sort sort) { | |
| 51 | List<Order> orders = new ArrayList<>(sort.toList()); | |
| 52 |
1
1. reverseOrders : removed call to java/util/Collections::reverse → KILLED |
Collections.reverse(orders); |
| 53 |
1
1. reverseOrders : replaced return value with Collections.emptyList for com/reallifedeveloper/tools/test/database/inmemory/SortUtil::reverseOrders → KILLED |
return orders; |
| 54 | } | |
| 55 | ||
| 56 | private static <T> void sort(List<T> items, Order order) { | |
| 57 |
1
1. sort : removed call to java/util/Collections::sort → RUN_ERROR |
Collections.sort(items, new FieldComparator<>(order)); |
| 58 | } | |
| 59 | ||
| 60 | @AllArgsConstructor | |
| 61 | @SuppressFBWarnings(value = "SE_COMPARATOR_SHOULD_BE_SERIALIZABLE", justification = "This class is only used interally when sorting") | |
| 62 | private static final class FieldComparator<T> implements Comparator<T> { | |
| 63 | ||
| 64 | private Order order; | |
| 65 | ||
| 66 | @Override | |
| 67 | @SuppressWarnings("unchecked") | |
| 68 | public int compare(T o1, T o2) { | |
| 69 | T fieldValue1 = (T) TestUtil.getFieldValue(o1, order.getProperty()); | |
| 70 | T fieldValue2 = (T) TestUtil.getFieldValue(o2, order.getProperty()); | |
| 71 |
1
1. compare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::compare → KILLED |
return nullSafeCompare(fieldValue1, fieldValue2); |
| 72 | } | |
| 73 | ||
| 74 | @SuppressWarnings("unchecked") | |
| 75 | private int nullSafeCompare(@Nullable T fieldValue1, @Nullable T fieldValue2) { | |
| 76 |
1
1. nullSafeCompare : negated conditional → KILLED |
if (fieldValue1 == null) { |
| 77 |
1
1. nullSafeCompare : negated conditional → NO_COVERAGE |
if (fieldValue2 == null) { |
| 78 | return 0; | |
| 79 |
1
1. nullSafeCompare : negated conditional → NO_COVERAGE |
} else if (order.getNullHandling() == NullHandling.NULLS_FIRST) { |
| 80 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → NO_COVERAGE |
return -1; |
| 81 | } else { | |
| 82 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → NO_COVERAGE |
return 1; |
| 83 | } | |
| 84 | } | |
| 85 |
1
1. nullSafeCompare : negated conditional → KILLED |
if (fieldValue2 == null) { |
| 86 |
1
1. nullSafeCompare : negated conditional → NO_COVERAGE |
if (order.getNullHandling() == NullHandling.NULLS_FIRST) { |
| 87 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → NO_COVERAGE |
return 1; |
| 88 | } else { | |
| 89 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → NO_COVERAGE |
return -1; |
| 90 | } | |
| 91 | } | |
| 92 | // We simply try to cast the field value to Comparable, it it fails we get a ClassCastException: | |
| 93 | int compareResult = ((Comparable<T>) fieldValue1).compareTo(fieldValue2); | |
| 94 |
1
1. nullSafeCompare : negated conditional → KILLED |
if (order.isAscending()) { |
| 95 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → KILLED |
return compareResult; |
| 96 | } else { | |
| 97 |
1
1. nullSafeCompare : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::nullSafeCompare → KILLED |
return invert(compareResult); |
| 98 | } | |
| 99 | } | |
| 100 | ||
| 101 | private static int invert(int c) { | |
| 102 |
2
1. invert : changed conditional boundary → SURVIVED 2. invert : negated conditional → KILLED |
if (c < 0) { |
| 103 |
1
1. invert : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::invert → SURVIVED |
return 1; |
| 104 |
2
1. invert : negated conditional → KILLED 2. invert : changed conditional boundary → KILLED |
} else if (c > 0) { |
| 105 |
1
1. invert : replaced int return with 0 for com/reallifedeveloper/tools/test/database/inmemory/SortUtil$FieldComparator::invert → RUN_ERROR |
return -1; |
| 106 | } else { | |
| 107 | return 0; | |
| 108 | } | |
| 109 | } | |
| 110 | } | |
| 111 | } | |
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