add assertAsMap

java/src/main/java/com/aliyun/teautil/Common.java

@@ -39,6 +39,18 @@ public static Object parseJSON(String json) {
         return new Gson().fromJson(json, Map.class);
     }
 
+    /**
+     * Assert a value, if it is a map, return it, otherwise throws
+     *
+     * @return the map value
+     */
+    public static Map<String, Object> assertAsMap(Object object) {
+        if (null != object && !List.class.isAssignableFrom(object.getClass())) {
+            return new Gson().fromJson(String.valueOf(object), Map.class);
+        }
+        throw new RuntimeException("The value is not a object");
+    }
+
     /**
      * Read data from a readable stream, and compose it to a bytes
      *

java/src/test/java/com/aliyun/teautil/CommonTest.java

@@ -9,10 +9,7 @@
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
 import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.SimpleTimeZone;
+import java.util.*;
 
 public class CommonTest {
     @Test
@@ -134,4 +131,23 @@ public void stringifyMapValueTest() {
         Assert.assertEquals("string", result.get("testString"));
         Assert.assertEquals("1", result.get("testNum"));
     }
+
+    @Test
+    public void assertAsMapTest() {
+        try {
+            Common.assertAsMap(new ArrayList<>());
+            Assert.fail();
+        }catch (Exception e) {
+            Assert.assertEquals("The value is not a object", e.getMessage());
+        }
+
+        try {
+            Common.assertAsMap(null);
+            Assert.fail();
+        }catch (Exception e) {
+            Assert.assertEquals("The value is not a object", e.getMessage());
+        }
+
+        Assert.assertEquals("test", Common.assertAsMap("{\"test\":\"test\"}").get("test"));
+    }
 }