By David Brownell
This concise e-book can provide the knowledge you want to successfully use the straightforward API for XML (SAX2), the dominant API for effective XML processing with Java. With the SAX2 API, builders have entry to the data in XML files as they're learn, with out enforcing significant reminiscence constraints or a wide code footprint. SAX2 is frequently utilized by different APIs "under the covers", and gives a origin for processing and growing either XML and non-XML information.While commonly thought of the best method of dealing with XML record parsing, SAX2 additionally consists of an important studying curve. In SAX2, writer David Brownell explores the various info of coping with XML parsers, filtering the knowledge these parsers go back, producing your personal SAX2 occasions to transform non-XML info to an XML shape, and constructing suggestions for utilizing event-based parsing in numerous software scenarios.Created in a public strategy by means of the XML-Dev mailing checklist, the SAX2 API is compact and hugely sensible. SAX2 makes use of callbacks to record the knowledge in an XML record because the rfile is learn, permitting you to create your individual application constructions round the content material of records. No middleman version of a complete XML record is important, and the mapping from XML constructions to Java constructions and again is straightforward.Both builders studying approximately SAX2 for the 1st time and builders returning for reference and complicated fabric approximately SAX2 will locate precious info during this e-book. Chapters offer special factors and examples of many various features of SAX2 improvement, whereas appendices offer a connection with the API and a proof of the relationships among the SAX2 API and the XML details Set.While the middle of the API is kind of approachable, lots of its extra complex positive factors are either imprecise and strong. you should use SAX2 to clear out, alter, and restructure details in layers of processing which make it effortless to reuse regularly occurring instruments. SAX2 additionally has a few major boundaries that purposes have to deal with of their personal methods. This new publication offers the aspect and examples required to exploit SAX2 to its complete strength, benefiting from its energy whereas heading off its boundaries.
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Extra resources for SAX2: Processing XML Efficiently with Java
Sample text
If you only need the core XML data model (elements, attributes, and text), this could be the only handler you use. DeclHandler This handler reports DTD declarations that aren’t exposed through DTDHandler (or in one case LexicalHandler) callbacks: declarations for elements, attributes, and parsed entities. Because it is an extension handler, it won’t necessarily be recognized by all SAX2 parsers, and DefaultHandler doesn’t provide no-op implementations for its callbacks. 0 specification requires all processors to expose: declarations for notations and for unparsed entities.
GetType() methods if you can deal with incomplete reporting for enumerated types. ) The Attributes object passed to startElement() is only usable during that callback. If you need access to information found there, you must copy it. ”. The methods in the Attributes interface are summarized in Appendix A. For more information, consult the SAX javadoc. Essential ContentHandler Callbacks In the earlier code example, we used some callbacks without really explaining what they did and what their parameters were.
Other than that, it’s fairly typical of how you’ll be using SAX2, at least in terms of the basic structure. You can make real programs from this skeleton if you substitute smarter components for the simple ones shown here. We introduced a few SAX classes and interfaces, so we can add some details to our earlier producer/consumer picture to get Figure 2-2. This producer is an XMLReader, and we’re listening to one consumer interface and the Err orHandler. The whole thing is driven by an application which is pulling the whole document through the reader.