use Java 7 APIs to get parameter annotations

easy-rules-core/src/main/java/org/jeasy/rules/core/RuleDefinitionValidator.java

@@ -29,7 +29,6 @@ import org.jeasy.rules.api.Facts;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.lang.reflect.Parameter;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -109,32 +108,42 @@ class RuleDefinitionValidator {
     }
 
     private boolean isConditionMethodWellDefined(final Method method) {
-        Parameter[] parameters = method.getParameters();
         return Modifier.isPublic(method.getModifiers())
                 && method.getReturnType().equals(Boolean.TYPE)
-                && validParameters(parameters);
+                && validParameters(method);
+    }
+
+    private boolean validParameters(final Method method) {
+        int notAnnotatedParameterCount = 0;
+        Annotation[][] parameterAnnotations = method.getParameterAnnotations();
+        for(Annotation[] anns : parameterAnnotations){
+            if(anns.length == 0){
+                notAnnotatedParameterCount += 1;
+            } else {
+                //Annotation types has to be Fact
+                for(Annotation ann : anns){
+                    if(!ann.annotationType().equals(Fact.class)){
+                        return false;
+                    }
                 }
-
-    private boolean validParameters(Parameter[] parameters) {
-        List<Parameter> notAnnotatedParams = new ArrayList<>();
-        for (Parameter parameter : parameters) {
-            if (parameter.getAnnotation(Fact.class) == null) {
-                notAnnotatedParams.add(parameter);
             }
         }
-        if (notAnnotatedParams.size() > 1) {
+        if(notAnnotatedParameterCount > 1){
             return false;
-        } else if (notAnnotatedParams.size() == 1) {
-            Parameter parameter = notAnnotatedParams.get(0);
-            return parameter.getType().isAssignableFrom(Facts.class);
+        }
+        Class<?>[] parameterTypes = method.getParameterTypes();
+        if(parameterTypes.length > 1){
+            return false;
+        }
+        if(parameterTypes.length == 1 && notAnnotatedParameterCount == 1){
+            return parameterTypes[0].equals(Facts.class);
         }
         return true;
     }
 
     private boolean isActionMethodWellDefined(final Method method) {
-        Parameter[] parameters = method.getParameters();
         return Modifier.isPublic(method.getModifiers())
-                && validParameters(parameters);
+                && validParameters(method);
     }
 
     private boolean isPriorityMethodWellDefined(final Method method) {

easy-rules-core/src/main/java/org/jeasy/rules/core/RuleProxy.java

@@ -30,9 +30,9 @@ import org.jeasy.rules.annotation.Condition;
 import org.jeasy.rules.annotation.Priority;
 import org.jeasy.rules.api.Rule;
 
+import java.lang.annotation.Annotation;
 import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
-import java.lang.reflect.Parameter;
 import java.lang.reflect.Proxy;
 import java.util.*;
 
@@ -114,21 +114,21 @@ public class RuleProxy implements InvocationHandler {
     }
 
     private List<Object> getActualParameters(Method method, Facts facts) {
-        Parameter[] parameters = method.getParameters(); // validated upfront
         List<Object> actualParameters = new ArrayList<>();
-        for (Parameter parameter : parameters) {
-            Fact annotation = parameter.getAnnotation(Fact.class); // validated upfront
-            if (annotation == null) { // validated upfront, there may be only one parameter not annotated and which is of type Facts.class
-                actualParameters.add(facts);
-            } else {
-                String factName = annotation.value();
+        Annotation[][] parameterAnnotations = method.getParameterAnnotations();
+        for(Annotation[] ann : parameterAnnotations){
+            if(ann.length == 1){
+                String factName = ((Fact) (ann[0])).value(); //validated upfront.
                 Object fact = facts.get(factName);
                 if(fact == null){
                     throw new RuntimeException(String.format("No fact named %s found in known facts", factName));
                 }
                 actualParameters.add(fact);
+            } else {
+                actualParameters.add(facts); //validated upfront, there may be only one parameter not annotated and which is of type Facts.class
             }
         }
+
         return actualParameters;
     }
 

pom.xml

@@ -26,7 +26,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <java.version>1.8</java.version>
+        <java.version>1.7</java.version>
         <junit.version>4.12</junit.version>
         <assertj.version>2.6.0</assertj.version>
         <mockito.version>2.7.1</mockito.version>