压缩视频

yzg-util-base/src/main/java/com/yanzuoguang/util/helper/MapHelper.java

@@ -16,10 +16,12 @@ public class MapHelper {
      */
     public static <T extends MapKey> Map<String, T> getMap(List<T> list) {
         Map<String, T> map = new HashMap<>();
+        if (list != null) {
             for (T item : list) {
                 String key = item.getKey(item);
                 map.put(key, item);
             }
+        }
         return map;
     }
 
@@ -33,10 +35,12 @@ public class MapHelper {
      */
     public static <T extends Object> Map<String, T> getMap(List<T> list, MapKey<T> proxy) {
         Map<String, T> map = new HashMap<>();
+        if (list != null) {
             for (T item : list) {
                 String key = proxy.getKey(item);
                 map.put(key, item);
             }
+        }
         return map;
     }
 
@@ -49,12 +53,14 @@ public class MapHelper {
      */
     public static <T extends MapKey> List<String> getKeys(List<T> list) {
         List<String> to = new ArrayList<>();
+        if (list != null) {
             for (T item : list) {
                 String key = item.getKey(item);
                 if (!to.contains(key)) {
                     to.add(key);
                 }
             }
+        }
         return to;
     }
 
@@ -68,12 +74,14 @@ public class MapHelper {
      */
     public static <T extends Object> List<String> getKeys(List<T> list, MapKey<T> proxy) {
         List<String> to = new ArrayList<>();
+        if (list != null) {
             for (T item : list) {
                 String key = proxy.getKey(item);
                 if (!to.contains(key)) {
                     to.add(key);
                 }
             }
+        }
         return to;
     }