fix perf

Author: justin-tay

src/main/java/com/networknt/schema/ExecutionContext.java

@@ -256,10 +256,8 @@ public boolean isUnevaluatedItemsPresent() {
         return this.unevaluatedItemsPresent;
     }
 
-    public boolean setUnevaluatedPropertiesPresent(boolean set) {
-        boolean existing = this.unevaluatedPropertiesPresent;
+    public void setUnevaluatedPropertiesPresent(boolean set) {
         this.unevaluatedPropertiesPresent = set;
-        return existing;
     }
 
     public boolean setUnevaluatedItemsPresent(boolean set) {

src/main/java/com/networknt/schema/Schema.java

@@ -723,8 +723,14 @@ public void validate(ExecutionContext executionContext, JsonNode jsonNode, JsonN
 //            System.out.println("-----------------");
 //        }
         executionContext.evaluationSchema.addLast(this);
-        boolean unevaluatedPropertiesPresent = executionContext.setUnevaluatedPropertiesPresent(hasKeyword("unevaluatedProperties"));
-        boolean unevaluatedItemsPresent = executionContext.setUnevaluatedPropertiesPresent(hasKeyword("unevaluatedItems"));
+        boolean unevaluatedPropertiesPresent = executionContext.isUnevaluatedPropertiesPresent();
+        boolean unevaluatedItemsPresent =  executionContext.isUnevaluatedItemsPresent();
+        if (!unevaluatedPropertiesPresent) {
+            executionContext.setUnevaluatedPropertiesPresent(hasKeyword("unevaluatedProperties"));
+        }
+        if (!unevaluatedItemsPresent) {
+            executionContext.setUnevaluatedItemsPresent(hasKeyword("unevaluatedItems"));
+        }
         try {
             int currentErrors = executionContext.getErrors().size();
             for (KeywordValidator v : getValidators()) {
@@ -745,7 +751,7 @@ public void validate(ExecutionContext executionContext, JsonNode jsonNode, JsonN
         } finally {
             executionContext.evaluationSchema.removeLast();
             executionContext.setUnevaluatedPropertiesPresent(unevaluatedPropertiesPresent);
-            executionContext.setUnevaluatedPropertiesPresent(unevaluatedItemsPresent);
+            executionContext.setUnevaluatedItemsPresent(unevaluatedItemsPresent);
         }
     }