压缩视频

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

@@ -16,9 +16,11 @@ public class MapHelper {
      */
     public static <T extends MapKey> Map<String, T> getMap(List<T> list) {
         Map<String, T> map = new HashMap<>();
-        for (T item : list) {
-            String key = item.getKey(item);
-            map.put(key, item);
+        if (list != null) {
+            for (T item : list) {
+                String key = item.getKey(item);
+                map.put(key, item);
+            }
         }
         return map;
     }
@@ -33,9 +35,11 @@ public class MapHelper {
      */
     public static <T extends Object> Map<String, T> getMap(List<T> list, MapKey<T> proxy) {
         Map<String, T> map = new HashMap<>();
-        for (T item : list) {
-            String key = proxy.getKey(item);
-            map.put(key, item);
+        if (list != null) {
+            for (T item : list) {
+                String key = proxy.getKey(item);
+                map.put(key, item);
+            }
         }
         return map;
     }
@@ -49,10 +53,12 @@ public class MapHelper {
      */
     public static <T extends MapKey> List<String> getKeys(List<T> list) {
         List<String> to = new ArrayList<>();
-        for (T item : list) {
-            String key = item.getKey(item);
-            if (!to.contains(key)) {
-                to.add(key);
+        if (list != null) {
+            for (T item : list) {
+                String key = item.getKey(item);
+                if (!to.contains(key)) {
+                    to.add(key);
+                }
             }
         }
         return to;
@@ -68,10 +74,12 @@ public class MapHelper {
      */
     public static <T extends Object> List<String> getKeys(List<T> list, MapKey<T> proxy) {
         List<String> to = new ArrayList<>();
-        for (T item : list) {
-            String key = proxy.getKey(item);
-            if (!to.contains(key)) {
-                to.add(key);
+        if (list != null) {
+            for (T item : list) {
+                String key = proxy.getKey(item);
+                if (!to.contains(key)) {
+                    to.add(key);
+                }
             }
         }
         return to;