Merge branch 'feature/listUtil' into 'master'

Feature/list util

See merge request rays/pcloud-common-parent!163

a.txt

+afafa
\ No newline at end of file

pcloud-common/src/main/java/com/pcloud/common/utils/ListForInSQL.java

+package com.pcloud.common.utils;
+
+
+
+import java.util.List;
+
+public interface  ListForInSQL<T> {
+
+    <T>List<T>processSQL(List<Long> IdList);
+
+
+}

pcloud-common/src/main/java/com/pcloud/common/utils/ListUtils.java

@@ -3,6 +3,10 @@
  */
 package com.pcloud.common.utils;
 
+import org.apache.poi.ss.formula.functions.T;
+
+import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 
 /**
@@ -17,4 +21,73 @@ public class ListUtils {
 		return (list == null || list.isEmpty());
 	}
 
+    private static final Integer OFFSET = 500;
+
+    /**
+     * 切割list,默认500长度一个
+     * @param list
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupList(List<T> list) {
+        return groupList(list,OFFSET);
+    }
+
+    /**
+     * 切割list，自定义长度
+     * @param list
+     * @param length
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupList(List<T> list,int length) {
+        List<List<T>> listGroup = new ArrayList<>();
+        int listSize = list.size();
+        //子集合的长度
+        int toIndex = length;
+        for (int i = 0; i < list.size(); i += length) {
+            if (i + length > listSize) {
+                toIndex = listSize - i;
+            }
+            List<T> newList = list.subList(i, i + toIndex);
+            listGroup.add(newList);
+        }
+        return listGroup;
+    }
+
+    /**
+     * 切割list，自定义子集合个数
+     * @param list
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupListBySize(List<T> list,int size) {
+        int length = list.size()/size;
+        if(list.size()<10){
+            length = 1;
+        }
+        return groupList(list,length);
+    }
+
+    public static <T> List<T>groupList4SQL(ListForInSQL<T> listForInSQL,List<Long>idList){
+        HashSet<Long>idSet = new HashSet<>(idList);
+        idList.clear();
+        idList.addAll(idSet);
+        List<T>result = new ArrayList<>();
+        if(idList!=null && idList.size()>500){
+            List<List<Long>> lists = groupList(idList);
+            for (List<Long> list : lists) {
+                List<T> tempList = listForInSQL.processSQL(list);
+                result.addAll(tempList);
+            }
+            return result;
+        }else if(idList != null && idList.size()>0){
+            return listForInSQL.processSQL(idList);
+        }else{
+            return new ArrayList<>();
+        }
+
+    }
+
+
 }