Added uuid rule and fixed the integer rule

Author: JanHolger

src/main/java/org/javawebstack/validator/Validator.java

@@ -247,7 +247,11 @@ private static Map<String[], List<ValidationRule>> getClassRules(Class<?> type){
             return rules;
         }
         if(type.equals(Integer.class)){
-            rules.put(new String[0], Collections.singletonList(new IntegerRule()));
+            rules.put(new String[0], Collections.singletonList(new IntegerRule(Integer.MIN_VALUE, Integer.MAX_VALUE)));
+            return rules;
+        }
+        if(type.equals(UUID.class)){
+            rules.put(new String[0], Collections.singletonList(new UUIDRule()));
             return rules;
         }
         if(type.isEnum()){

src/main/java/org/javawebstack/validator/rule/IntegerRule.java

@@ -7,25 +7,31 @@ public class IntegerRule implements ValidationRule {
 
     private final int min;
     private final int max;
+    private final int step;
 
-    public IntegerRule(int min, int max){
+    public IntegerRule(int min, int max, int step){
         this.min = min;
         this.max = max;
+        this.step = step;
+    }
+
+    public IntegerRule(int min, int max){
+        this(min, max, 1);
     }
 
     public IntegerRule(String[] params){
         int min = Integer.MIN_VALUE;
         int max = Integer.MAX_VALUE;
+        int step = 1;
         if(params.length > 0)
             min = Integer.parseInt(params[0]);
         if(params.length > 1)
             max = Integer.parseInt(params[1]);
+        if(params.length > 2)
+            step = Integer.parseInt(params[2]);
         this.min = min;
         this.max = max;
-    }
-
-    public IntegerRule(){
-        this(Integer.MIN_VALUE, Integer.MAX_VALUE);
+        this.step = step;
     }
 
     public String validate(Validator validator, GraphElement value) {
@@ -47,6 +53,8 @@ public String validate(Validator validator, GraphElement value) {
             return String.format("Smaller than the minimum value (%d < %d)", v, min);
         if(v > max)
             return String.format("Greater than the maximum value (%d > %d)", v, max);
+        if(step > 1 && v-min % step != 0)
+            return String.format("Not in steps of %d", step);
         return null;
     }
 }

src/main/java/org/javawebstack/validator/rule/UUIDRule.java

@@ -0,0 +1,21 @@
+package org.javawebstack.validator.rule;
+
+import org.javawebstack.graph.GraphElement;
+import org.javawebstack.validator.Validator;
+
+import java.util.UUID;
+
+public class UUIDRule implements ValidationRule {
+
+    public String validate(Validator validator, GraphElement value) {
+        if(!value.isString())
+            return "Not a valid uuid value";
+        try {
+            UUID.fromString(value.string());
+            return null;
+        }catch (Exception ignored){
+            return "Not a valid uuid value";
+        }
+    }
+
+}