custom for specialViewer

src/main/java/com/virjar/ratel/api/inspect/ForceFiledViewer.java

@@ -166,6 +166,13 @@ public class ForceFiledViewer {
             return subRet;
         }
         String className = input.getClass().getName();
+
+        Function function = specialViewer.get(className);
+        if (function != null) {
+            //某些特殊的dump规则，不如jodaTime，dump内容没有意义
+            return function.apply(input);
+        }
+
         if (skipDumpPackage.isSubPackage(className) && !forceDumpPackage.isSubPackage(className)) {
             //框架内部对象，不抽取，这可能导致递归过深，而且没有意义
             return null;
@@ -279,10 +286,11 @@ public class ForceFiledViewer {
         return fields;
     }
 
-    private static final ConcurrentMap<Class, Map<String, Field>> fieldCache = new ConcurrentHashMap<>();
+    private static final ConcurrentMap<Class<?>, Map<String, Field>> fieldCache = new ConcurrentHashMap<>();
     private static PackageTrie forceDumpPackage = new PackageTrie();
     private static PackageTrie skipDumpPackage = new PackageTrie();
     private static PackageTrie skipTranslatePackage = new PackageTrie();
+    private static Map<String, Function> specialViewer = new ConcurrentHashMap<>();
 
     public static void addForceViewConfig(String basePackage) {
         forceDumpPackage.addToTree(basePackage);
@@ -296,6 +304,22 @@ public class ForceFiledViewer {
         skipTranslatePackage.addToTree(basePackage);
     }
 
+    public static void addSpecialViewer(String clazz, Function transformFunction) {
+        specialViewer.put(clazz, transformFunction);
+    }
+
+    public interface Function {
+        Object apply(Object o);
+    }
+
+    private static Function ToString = o -> {
+        if (o == null) {
+            return null;
+        }
+        return o.toString();
+    };
+
+
     static {
         addSkipViewConfig("android");
         addSkipViewConfig("com.android");
@@ -322,5 +346,9 @@ public class ForceFiledViewer {
         addSKipTranslateConfig("com.alibaba.fastjson");
         addSKipTranslateConfig("org.json");
         addSKipTranslateConfig("com.google.gson");
+
+        addSpecialViewer("org.joda.time.DateTime", ToString);
     }
+
+
 }