Improve handling error in ncs.

Author: asmab89

jdk_8_maven/cs/graphql/graphql-ncs/src/main/kotlin/org/graphqlncs/ExepTy.kt

@@ -0,0 +1,21 @@
+package org.graphqlncs
+
+import graphql.ErrorClassification
+import graphql.ErrorType
+
+
+open class ExpTy(
+    errorMessage: String? = "",
+    private val parameters: Map<String, Any>? = mutableMapOf()
+) : GraphQLException(errorMessage) {
+    override val message: String?
+        get() = super.message
+
+     override fun getExtensions(): MutableMap<String, Any> {
+        return mutableMapOf("parameters" to (parameters ?: mutableMapOf()))
+    }
+
+     override fun getErrorType(): ErrorClassification {
+        return ErrorType.ValidationError
+    }
+}

jdk_8_maven/cs/graphql/graphql-ncs/src/main/kotlin/org/graphqlncs/GraphQLException.java

@@ -0,0 +1,31 @@
+package org.graphqlncs;
+
+import graphql.ErrorClassification;
+import graphql.GraphQLError;
+import graphql.language.SourceLocation;
+
+import java.util.List;
+
+public class GraphQLException extends RuntimeException implements GraphQLError {
+
+    String customMessage;
+
+    public GraphQLException(String customMessage) {
+        this.customMessage = customMessage;
+    }
+
+    @Override
+    public String getMessage() {
+        return customMessage;
+    }
+
+    @Override
+    public List<SourceLocation> getLocations() {
+        return null;
+    }
+
+    @Override
+    public ErrorClassification getErrorType() {
+        return null;
+    }
+}

jdk_8_maven/cs/graphql/graphql-ncs/src/main/kotlin/org/graphqlncs/resolver/QueryResolver.kt

@@ -2,6 +2,7 @@ package org.graphqlncs.resolver
 
 import graphql.kickstart.tools.GraphQLQueryResolver
 import org.graphqlncs.Exep
+import org.graphqlncs.ExpTy
 import org.graphqlncs.type.*
 import org.springframework.http.ResponseEntity
 import org.springframework.stereotype.Component
@@ -36,14 +37,14 @@ open class QueryResolver(
     fun remainder(a: Int, b:Int  ): Int {
         val lim = 10000
         return if (a > lim || a < -lim || b > lim || b < -lim) {
-            throw Exep("400")
+            throw ExpTy("400")
         } else remainder.exe(a, b)
     }
 
     fun bessj(n:Int, x:Double  ): Double {
 
         return if (n <= 2 || n > 1000) {
-            throw Exep("400")
+            throw ExpTy("400")
 
         } else
             bessj.bessj(n, x)