Added keys method to GraphObject

Author: JanHolger

src/main/java/org/javawebstack/graph/GraphObject.java

@@ -5,6 +5,7 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 import java.util.function.BiConsumer;
 
 public class GraphObject implements GraphElement {
@@ -113,4 +114,8 @@ public Map<String[], Object> toTree(){
         return tree;
     }
 
+    public Set<String> keys(){
+        return entries.keySet();
+    }
+
 }

src/main/java/org/javawebstack/graph/GraphPrimitive.java

@@ -34,16 +34,14 @@ public GraphPrimitive primitive() {
     }
 
     public String string(){
-        return value.toString();
+        return (String) value;
     }
     public Number number(){
         return (Number) value;
     }
     public Boolean bool(){
         if(isBoolean())
             return (Boolean) value;
-        if(isString())
-            return Boolean.parseBoolean(string());
         return null;
     }
     public Object value() {
@@ -95,4 +93,9 @@ public Type getType() {
             return Type.STRING;
         return null;
     }
+
+    public String toString(){
+        return value.toString();
+    }
+
 }