Enhancement to ValidateComponent to implement a complete and flexible error
handling scheme for schema validation
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Key: SM-525
URL: https://issues.apache.org/activemq/browse/SM-525
Project: ServiceMix
Issue Type: Improvement
Components: servicemix-components
Environment: Ubuntu Linux 5.10, Windows XP SP2, ServiceMix HEAD
Reporter: Grant McDonald
Attachments: servicemix-components.zip
The purpose of this enchancement was to provide the following:
1) Allow error messages to be captured by the ValidateComponent and sent back
as the content of a fault message;
2) Preserve existing functionality; and
3) Provide a framework for extending the functionality
It was noted that the existing functionality only dealt with simple case valid
or not valid schemas. It was decided to make the standard component more
extensible and functional and as such this code is being contributed back to
the ServiceMix project. To this end the following changes have been made and
are available in the attached zip file:
1) Added MessageAwareErrorHandler interface - this interface extends the
org.xml.sax.ErrorHandler interface and adds contracts for determining if the
error handler has errors, whether it captures messages from the validator, and
what message formats it supports.
2) Refactored CountingErrorHandler to extend from MessageAwareErrorHandler and
implement the above mentioned methods
3) Created MessageAggregatingErrorHandler - this class aggregates all warning,
error and fatal error messages into an XML format (via CDATA). It provides the
ability to set the root document path and namespace via configuration and
supports DOMSource, StringSource and String formats for the encapsulated data.
4) modified ValidateComponent - added errorHandler property to facilitate
dependency injection, with a default value of CountingErrorHandler to preserve
existing functionality. Refactored the handling of validation errors to use
the new interfaces. errorHandlers which do not support the capturing of
messages will use the previous method of sending the DOMResult back as the
fault message content. errorHandlers which do support the capture of messages
will send the error message xml back as the fault message content. The src
document is now set as a property on the fault message.
Additionally, a null pointer check was added to the init on the
schemaResource.getURL() method call.
A testcase has been added to ValidationTest and the example.xml in the
validation test/resources package demonstrates the configuration of this
functionality.
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