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CollectionTools#isNotEmpty 支持 guava 的 Table、Multimap、Multiset 和 RangeSet

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zhouxy108 2025-02-14 16:57:45 +08:00
parent d217e8b9ac
commit e3ff5a2ab3
2 changed files with 108 additions and 5 deletions
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65
src/main/java/xyz/zhouxy/plusone/commons/collection/CollectionTools.java
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@ -1,5 +1,5 @@
/*
* Copyright 2023-2024 the original author or authors.
* Copyright 2023-2025 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -25,6 +25,11 @@ import java.util.Set;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;
import com.google.common.collect.RangeSet;
import com.google.common.collect.Table;
/**
* 集合工具类
*
@ -33,9 +38,9 @@ import javax.annotation.Nullable;
*/
public class CollectionTools {
// TODO [添加] 新增其它集合类型，如 guava 的扩展集合等
// isEmpty
// ================================
// #region - isEmpty
// ================================
public static boolean isEmpty(@Nullable Collection<?> collection) {
return collection == null || collection.isEmpty();
@ -45,7 +50,29 @@ public class CollectionTools {
return map == null || map.isEmpty();
}
// isNotEmpty
public static boolean isEmpty(@Nullable Table<?, ?, ?> table) {
return table == null || table.isEmpty();
}
public static boolean isEmpty(@Nullable Multimap<?, ?> map) {
return map == null || map.isEmpty();
}
public static boolean isEmpty(@Nullable Multiset<?> set) {
return set == null || set.isEmpty();
}
public static boolean isEmpty(@Nullable RangeSet<?> set) {
return set == null || set.isEmpty();
}
// ================================
// #endregion - isEmpty
// ================================
// ================================
// #region - isNotEmpty
// ================================
public static boolean isNotEmpty(@Nullable Collection<?> collection) {
return collection != null && !collection.isEmpty();
@ -55,6 +82,30 @@ public class CollectionTools {
return map != null && !map.isEmpty();
}
public static boolean isNotEmpty(@Nullable Table<?, ?, ?> table) {
return table != null && !table.isEmpty();
}
public static boolean isNotEmpty(@Nullable Multimap<?, ?> map) {
return map != null && !map.isEmpty();
}
public static boolean isNotEmpty(@Nullable Multiset<?> set) {
return set != null && !set.isEmpty();
}
public static boolean isNotEmpty(@Nullable RangeSet<?> set) {
return set != null && !set.isEmpty();
}
// ================================
// #endregion - isNotEmpty
// ================================
// ================================
// #region - nullToEmpty
// ================================
@Nonnull
public static <T> List<T> nullToEmptyList(@Nullable List<T> list) {
return list == null ? Collections.emptyList() : list;
@ -70,6 +121,10 @@ public class CollectionTools {
return map == null ? Collections.emptyMap() : map;
}
// ================================
// #endregion - nullToEmpty
// ================================
private CollectionTools() {
throw new IllegalStateException("Utility class");
}

48
src/test/java/xyz/zhouxy/plusone/commons/collection/CollectionToolsTests.java
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@ -34,14 +34,24 @@ import java.util.Set;
import org.junit.jupiter.api.Test;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;
import com.google.common.collect.Range;
import com.google.common.collect.RangeSet;
import com.google.common.collect.Sets;
import com.google.common.collect.Table;
import com.google.common.collect.TreeRangeSet;
public class CollectionToolsTests {
@Test
void testIsEmpty() {
// Collection
List<String> list = new ArrayList<>();
assertTrue(CollectionTools.isEmpty(list));
assertFalse(CollectionTools.isNotEmpty(list));
@ -50,6 +60,7 @@ public class CollectionToolsTests {
assertFalse(CollectionTools.isEmpty(list));
assertTrue(CollectionTools.isNotEmpty(list));
// Map
Map<String, Integer> map = new HashMap<>();
assertTrue(CollectionTools.isEmpty(map));
assertFalse(CollectionTools.isNotEmpty(map));
@ -57,6 +68,43 @@ public class CollectionToolsTests {
map.put("2", 2);
assertFalse(CollectionTools.isEmpty(map));
assertTrue(CollectionTools.isNotEmpty(map));
// Table
Table<String, String, Integer> table = HashBasedTable.create();
assertTrue(CollectionTools.isEmpty(table));
assertFalse(CollectionTools.isNotEmpty(table));
table.put("ABC", "d", 4);
assertFalse(CollectionTools.isEmpty(table));
assertTrue(CollectionTools.isNotEmpty(table));
// Multimap
Multimap<String, String> multimap = HashMultimap.create();
assertTrue(CollectionTools.isEmpty(multimap));
assertFalse(CollectionTools.isNotEmpty(multimap));
multimap.put("ABC", "d");
assertFalse(CollectionTools.isEmpty(multimap));
assertTrue(CollectionTools.isNotEmpty(multimap));
// Multiset
Multiset<String> multiset = HashMultiset.create();
assertTrue(CollectionTools.isEmpty(multiset));
assertFalse(CollectionTools.isNotEmpty(multiset));
multiset.add("ABC");
assertFalse(CollectionTools.isEmpty(multiset));
assertTrue(CollectionTools.isNotEmpty(multiset));
// RangeSet
RangeSet<Integer> rangeSet = TreeRangeSet.create();
assertTrue(CollectionTools.isEmpty(rangeSet));
assertFalse(CollectionTools.isNotEmpty(rangeSet));
rangeSet.add(Range.closed(0, 100));
rangeSet.add(Range.openClosed(100, 200));
assertFalse(CollectionTools.isEmpty(rangeSet));
assertTrue(CollectionTools.isNotEmpty(rangeSet));
}
@Test