repos init.

src/main/java/com/serliunx/ddns/support/Assert.java

@@ -0,0 +1,52 @@
+package com.serliunx.ddns.support;
+
+import java.util.Collection;
+
+/**
+ * 断言
+ * @author SerLiunx
+ * @since 1.0
+ */
+public final class Assert {
+
+    private Assert(){throw new UnsupportedOperationException();}
+
+    public static void notNull(Object object){
+        notNull(object, null);
+    }
+
+    public static void notNull(Object object, String msg){
+        if(object == null)
+            throw new NullPointerException(msg);
+    }
+
+    public static void notNull(Object...objects){
+        for (Object object : objects) {
+            notNull(object);
+        }
+    }
+
+    public static void isPositive(int i){
+        if(i <= 0){
+            throw new IllegalArgumentException("指定参数必须大于0!");
+        }
+    }
+
+    public static void isLargerThan(int source, int target){
+        if(source <= target){
+            throw new IllegalArgumentException(String.format("%s太小了, 它必须大于%s", source, target));
+        }
+    }
+
+    public static void notEmpty(Collection<?> collection){
+        notNull(collection);
+        if(collection.isEmpty())
+            throw new IllegalArgumentException("参数不能为空!");
+    }
+
+    public static void notEmpty(CharSequence charSequence){
+        notNull(charSequence);
+        if(charSequence.length() == 0)
+            throw new IllegalArgumentException("参数不能为空!");
+    }
+}