Graceful failure for @LOG that follows @IN

[chicoreus]

Naïve use of @log would simply embedd it in an @begin @EnD block where a logging statement occurs, however, @log appears to need to follow an @out annotation, having a bare @log which happens to follow a @in statement results in a not immediately helpful exception:

java.lang.ClassCastException: org.yesworkflow.annotations.In cannot be cast to org.yesworkflow.annotations.Out

Graceful failure in this case with a pertinent error message would help.

To reproduce:

# @BEGIN FilterExcludingMarine 
# @IN TaggedDataRecord         
# @LOG {timestamp} [{loglevel}] ACTOR<{actorname}> ->  [{filterKey}]=[{matchValue}]:{match}. Passing occurrenceID={occurrenceID}    
# @OUT NotMarine
# @END FilterExcludingMarin

[chicoreus]

Here's a potential fix:

diff --git a/src/main/java/org/yesworkflow/extract/DefaultExtractor.java b/src/main/java/org/yesworkflow/extract/DefaultExtractor.java
index 5e25c66..3bb96c9 100644
--- a/src/main/java/org/yesworkflow/extract/DefaultExtractor.java
+++ b/src/main/java/org/yesworkflow/extract/DefaultExtractor.java
@@ -319,7 +319,11 @@ public class DefaultExtractor implements Extractor {
                                     break;
                     case IN:        annotation = new In(id, sourceId, lineNumber, annotationString);
                                     break;
-                    case LOG:       annotation = new Log(id, sourceId, lineNumber, annotationString, (Out) primaryAnnotation);
+                    case LOG:       try { 
+                                        annotation = new Log(id, sourceId, lineNumber, annotationString, (Out) primaryAnnotation);
+                                    } catch (ClassCastException cce) { 
+                                        throw new YWMarkupException("A LOG annotation must follow an OUT annotation as its primaryAnnotation.");
+                                    }
                                     break;
                     case OUT:       annotation = new Out(id, sourceId, lineNumber, annotationString);
                                     break;