[JBRULES-3480] notify RF deprecation with a KnowledgeBuilder warning

drools-compiler/src/main/java/org/drools/compiler/DeprecatedResourceTypeWarning.java

@@ -0,0 +1,28 @@
+package org.drools.compiler;
+
+import org.drools.io.Resource;
+import org.drools.io.internal.InternalResource;
+
+public class DeprecatedResourceTypeWarning extends DroolsWarning {
+
+    private final String deprecatedFormat;
+
+    public DeprecatedResourceTypeWarning(Resource resource) {
+        this(resource, ((InternalResource) resource).getResourceType().getName());
+    }
+
+    public DeprecatedResourceTypeWarning(Resource resource, String deprecatedFormat) {
+        super(resource);
+        this.deprecatedFormat = deprecatedFormat;
+    }
+
+    @Override
+    public String getMessage() {
+        return deprecatedFormat + " format usage detected. This format is deprecated and will be removed in future";
+    }
+
+    @Override
+    public int[] getLines() {
+        return new int[0];
+    }
+}

drools-compiler/src/main/java/org/drools/compiler/DroolsWarning.java

@@ -0,0 +1,16 @@
+package org.drools.compiler;
+
+import org.drools.builder.ResultSeverity;
+import org.drools.io.Resource;
+
+public abstract class DroolsWarning extends BaseKnowledgeBuilderResultImpl {
+
+    public DroolsWarning(Resource resource) {
+        super(resource);
+    }
+
+    @Override
+    public ResultSeverity getSeverity() {
+        return ResultSeverity.WARNING;
+    }
+}

drools-compiler/src/main/java/org/drools/compiler/PackageBuilder.java

@@ -641,7 +641,7 @@ public void addProcessFromXml( Resource resource ) {
         }
 
         if ( ResourceType.DRF.equals( ( (InternalResource) resource ).getResourceType() ) ) {
-            System.err.println("RF format usage detected. This format is deprecated and will be removed in future");
+            this.results.add( new DeprecatedResourceTypeWarning(resource, "RF") );
         }
 
         this.resource = resource;