The DocBook Validator in Java

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The DocBook Validator
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The cleanup method gives a validator a chance to clean up any artifacts produced during validation As we will discuss next, the DocBook validator logic does not produce any artifacts that require clean up after validation completes, so this method remains empty As it stands, the only method that the DocBook validator needs to implement is the validateInJob method, which contains the validation logic The validateInJob method starts by requesting the list of file URIs to be validated from the helper Only files applicable for the validator will be in the list, but it is the responsibility of the validator to iterate over the files and validate each one This feature allows validators to implement specific logic for batch validation such as caching document models to improve performance The validator iterates over this list, validating each file The exit criteria for the loop iterating over the files contains an additional check The exit criteria contains the expression
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!reporterisCancelled()
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This condition checks whether the validator has received a cancel request, such as that issued when a user selects to cancel validation, and terminates validation without validating the remaining files To be a good citizen in the workbench and as part of the validation framework, a validator should check periodically to see if it has been canceled (See the Validator Best Practices sidebar that follows for more about being a good validation citizen) The DocBook validation logic is then implemented as a two-step process:
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Step 1: DocBook is an XML language The first step is to validate the document for XML conformance Success in this step means the document is a well-formed XML document The DocBook validator uses the standard Java XML parsing (JAXP) interface to parse the DocBook document Using JAXP serves two purposes First, it has a validation option that performs XML conformance validation required by this step Second, it parses the DocBook document into an easily traversable XML model, which will be used in step 2 A custom error reporter is registered with the parser that allows the DocBook validator to report XML conformance errors using the validation framework A LocalizedMessage object is used to hold an error, warning, or information message and is passed to the reporter to report the message to the workbench LocalizedMessage is used
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CHAPTER 13
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Supporting New File Types
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both when reporting errors produced from XML conformance validation and when reporting custom DocBook error messages in step 2
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Step 2: DocBook contains specific rules beyond those defined for XML conformance These rules are what differentiate a DocBook document from a generic XML document with no specified grammar The second step is to validate the document according to the DocBook specific rule set To keep this example simple and focused on the validation extension, the DocBook validator only checks that the root element is one of the allowed elements The allowed root elements are appendix, article, bibliography, book, chapter, glossary, preface, and set Obviously, a complete validator will need to check a lot more than the root element Note that XML languages often define an XML schema or DTD, which can be used to perform most language-specific validation with the XML validator DocBook does have an XML schema defined This example does not make use of the schema to show the two stages of validation After all the files have been validated, the validator returns the OK status, signifying that validation has completed
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Tip: When implementing the DocBook validator you may see several restricted access warnings These warnings appear because the validation framework API is still internal To make it easier to work, you can disable these warnings by following these steps: 1 Right click on the DocBook plug-in project and select Properties Java Compiler Errors/Warnings The Errors/Warnings page opens 2 Select Enable project specific settings, expand the Discouraged reference (access rules) section and change the Deprecated and restricted API Discouraged reference (access rules) option to Ignore
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9 You ve declared the minimum that s required to run the DocBook validator Now is a good time to take a look at what you ve accomplished thus far Launch a runtime workbench In the runtime workbench select Window Preferences Validation The Validation preference page should
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