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From Apache Wiki <>
Subject [Myfaces Wiki] Update of "Extensions/Validator/DevDoc" by GerhardPetracek
Date Wed, 04 Feb 2009 15:51:41 GMT
Dear Wiki user,

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The following page has been changed by GerhardPetracek:

     * invoke all registered instances of ProcessedInformationRecorder (generic mechanism
e.g. used for cross-validation)
     * process metadata based validation
       * extract metadata
-      * map key of current metadata entry to the validation strategy
+      * map current metadata entry to the validation strategy
       * check skipped validation
       * validate
@@ -233, +233 @@

  implementation details:
  @SkipValidation also has a validation strategy. if the condition is true the strategy adds
an information to the current metadata entry that the validation of further annotations should
be skipped (if supported). that works because all metadata entries for a property share the
same information (of the property). so this information is available for all following validations.
+ === MetaDataExtractionInterceptor ===
+ (since 1.x.2)
+ to get a better performance for the jsr 303 integration this type of interceptor was introduced.[[BR]]
+ e.g. in case of xml configured class based validation it isn't required to have an annotation
in place. so such an interceptor has to add the information provided by xml configs to the
PropertyInformation object.[[BR]]
+ the alternative (without changes) would be an additional renderer-interceptor (this would
lead to double extraction for each property). furthermore, MetaDataExtractionInterceptors
allows the core to be independent of jsr 303 mechanisms. moreover, it also allows similar
3rd party mechanisms.
+ adding a custom implementation:
+ {{{
+ ExtValContext.getContext().addMetaDataExtractionInterceptor(new CustomMetaDataExtractionInterceptor());
+ }}}
  == MetaDataTransformer ==

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