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you have to effectively extract and process only parts of a document. the XML document structure and the order of information map well to the domain-speci c objects. you are familiar with event-based programming. there is no need to generate/write XML documents.
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One last important thing to note about the SAX processing model is that it is a push model, in which the parser pushes the event onto the application, which may not be prepared to handle the event. In such a case, the information associated with that event will be lost and cannot be recovered. This push model is shown schematically in Figure 11.7.
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StAX (Streaming API for XML) is a new API that is fast becoming the most common processing model for Java applications. Like SAX, this processing model is based on streaming. Streaming refers to a programming model in which XML infosets are transmitted and parsed serially at application runtime, often in real time, and often from dynamic sources whose contents are not precisely known beforehand. Moreover, stream-based parsers can start generating output immediately, and infoset elements can be discarded and garbage collected immediately after they are used. (Note that infoset is short for information set, which refers to the collection of information items of a particular XML document.) Although stream processing provides a smaller memory footprint, reduced processor requirements, and higher performance in
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certain situations, the primary trade-off is that you can only see the infoset state at one location at a time in the document. You are essentially limited to the cardboard tube view of a document, the implication being that you need to know what processing you want to do before reading the XML document. Unlike SAX, StAX is a pull streaming processing model, which is a programming model in which a client application calls methods on an XML parsing library when it needs to interact with an XML infoset that is, the client only gets (pulls) XML data when it explicitly asks for it. This pull streaming model is shown schematically in Figure 11.8. Pull parsing provides several advantages over push parsing when working with XML streams:
With pull parsing, the client controls the application thread and can call methods on the parser when needed. By contrast, with push processing, the parser controls the application thread, and the client can only accept invocations from the parser. Pull parsing libraries can be much smaller, and the client code to interact with those libraries can be much simpler than with push libraries, even for more complex documents. Pull clients can read multiple documents at one time with a single thread. A StAX pull parser can lter XML documents such that elements unnecessary to the client can be ignored, and it can support XML views of nonXML data.
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In addition to these advantages for parsing by StAX, StAX offers full support for marshalling the infoset into an XML document. Recall that SAX does not offer such a facility, at least one that can be used easily. Another advantage that StAX has is that StAX-enabled clients are generally easier to code than SAX clients. Although it can be argued that SAX parsers are marginally easier to write, StAX parser code can be smaller and the code necessary for the client to interact with the parser simpler. In summary, you should use the StAX processing model when any of the following apply:
You are dealing with very large documents and memory usage is an issue. You are familiar with event-based programming. The document must be processed only once. There is need for marshalling and unmarshalling XML documents. You want high performance.
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