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修复CollUtil.containsAll在coll2长度大于coll1时逻辑歧义问题
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@ -2,7 +2,7 @@
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# 🚀Changelog
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-------------------------------------------------------------------------------------------------------------
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# 5.8.26(2024-01-25)
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# 5.8.26(2024-01-26)
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### 🐣新特性
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* 【db 】 RedisDS增加user支持(issue#I8XEQ4@Gitee)
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@ -13,6 +13,7 @@
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* 【core 】 修复BeanToMapCopier获取类型数组越界问题(issue#3468@Github)
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* 【extra 】 修复SshjSftpSession关闭导致的问题(issue#3472@Github)
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* 【http 】 修复HtmlUtil.removeHtmlAttr处理空格问题(issue#I8YV0K@Gitee)
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* 【core 】 修复CollUtil.containsAll在coll2长度大于coll1时逻辑歧义问题(issue#I8Z2Q4@Gitee)
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-------------------------------------------------------------------------------------------------------------
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# 5.8.25(2024-01-11)
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@ -7,10 +7,7 @@ import cn.hutool.core.comparator.PropertyComparator;
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import cn.hutool.core.convert.Convert;
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import cn.hutool.core.convert.ConverterRegistry;
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import cn.hutool.core.exceptions.UtilException;
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import cn.hutool.core.lang.Assert;
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import cn.hutool.core.lang.Editor;
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import cn.hutool.core.lang.Filter;
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import cn.hutool.core.lang.Matcher;
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import cn.hutool.core.lang.*;
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import cn.hutool.core.lang.func.Func1;
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import cn.hutool.core.lang.hash.Hash32;
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import cn.hutool.core.map.MapUtil;
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@ -496,13 +493,16 @@ public class CollUtil {
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}
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/**
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* 集合1中是否包含集合2中所有的元素,即集合2是否为集合1的子集
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* 集合1中是否包含集合2中所有的元素。<br>
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* 当集合1和集合2都为空时,返回{@code true}
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* 当集合2为空时,返回{@code true}
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*
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* @param coll1 集合1
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* @param coll2 集合2
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* @return 集合1中是否包含集合2中所有的元素
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* @since 4.5.12
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*/
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@SuppressWarnings("SuspiciousMethodCalls")
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public static boolean containsAll(Collection<?> coll1, Collection<?> coll2) {
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if (isEmpty(coll1)) {
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return isEmpty(coll2);
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@ -512,12 +512,31 @@ public class CollUtil {
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return true;
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}
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if (coll1.size() < coll2.size()) {
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return false;
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// Set直接判定
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if(coll1 instanceof Set){
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return coll1.containsAll(coll2);
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}
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for (Object object : coll2) {
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if (false == coll1.contains(object)) {
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// 参考Apache commons collection4
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// 将时间复杂度降低到O(n + m)
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final Iterator<?> it = coll1.iterator();
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final Set<Object> elementsAlreadySeen = new HashSet<>(coll1.size(), 1);
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for (final Object nextElement : coll2) {
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if (elementsAlreadySeen.contains(nextElement)) {
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continue;
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}
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boolean foundCurrentElement = false;
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while (it.hasNext()) {
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final Object p = it.next();
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elementsAlreadySeen.add(p);
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if (Objects.equals(nextElement, p)) {
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foundCurrentElement = true;
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break;
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}
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}
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if (false == foundCurrentElement) {
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return false;
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}
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}
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@ -1084,4 +1084,20 @@ public class CollUtilTest {
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Assert.assertNull(CollUtil.max(null));
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}
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@Test
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public void issueI8Z2Q4Test() {
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ArrayList<String> coll1 = new ArrayList<>();
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coll1.add("1");
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coll1.add("2");
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coll1.add("3");
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coll1.add("4");
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ArrayList<String> coll2 = new ArrayList<>();
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coll2.add("1");
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coll2.add("1");
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coll2.add("1");
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coll2.add("1");
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coll2.add("1");
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Assert.assertTrue(CollUtil.containsAll(coll1, coll2));
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}
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}
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