- Fix missing import in groovy test.

- Code polishing.

src/main/java/eu/dnetlib/validator2/validation/guideline/SyntheticGuideline.java

@@ -32,13 +32,11 @@ public final class SyntheticGuideline extends AbstractGuideline<Document> {
         String canonical = Helper.ensureNonEmpty(name, () -> new IllegalArgumentException("Name cannot be empty"));
 
         // Here we define a guideline with a specific elementSpec as origin, we cannot allow null
-        if (elementSpec == null) {
+        if ( elementSpec == null )
             throw new IllegalArgumentException("ElementSpec cannot be empty");
-        }
 
-        if (weight < 0) {
+        if ( weight < 0 )
             throw new IllegalArgumentException("Weight cannot be negative");
-        }
 
         SyntheticGuideline guideline = new SyntheticGuideline(canonical, weight);
         guideline.compilationResult = new ElementSpecCompiler().compile(elementSpec, evaluation::get);
@@ -49,17 +47,14 @@ public final class SyntheticGuideline extends AbstractGuideline<Document> {
     public static SyntheticGuideline of(String name, int weight, RequirementLevel requirementLevel, Rule<Document> rule) {
         String canonical = Helper.ensureNonEmpty(name, () -> new IllegalArgumentException("Name cannot be empty"));
 
-        if (weight < 0) {
+        if ( weight < 0 )
             throw new IllegalArgumentException("Weight cannot be negative");
-        }
 
-        if (requirementLevel == null) {
+        if ( requirementLevel == null )
             throw new IllegalArgumentException("Requirement level cannot be empty");
-        }
 
-        if (rule == null) {
+        if ( rule == null )
             throw new IllegalArgumentException("Rule cannot be empty");
-        }
 
         SyntheticGuideline guideline = new SyntheticGuideline(canonical, weight);
         CompilationResult compilationResult = new CompilationResult();

src/test/groovy/eu/dnetlib/validator2/engine/XMLHelper.groovy

@@ -1,5 +1,6 @@
 package eu.dnetlib.validator2.engine
 
+import eu.dnetlib.validator2.engine.Helper
 import groovy.xml.DOMBuilder
 import groovy.xml.FactorySupport
 import org.w3c.dom.Document