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orgapachexercesparsersDOMParser; orgw3cdomDocument; orgw3cdomNode; orgw3cdomElement; orgw3cdomNodeList; orgxmlsaxSAXException;
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import javaioIOException; public class SimpleDom { private Document m_doc; public SimpleDom (String a_fileName) { /* Create the parser */ DOMParser dparser = new DOMParser(); /* Parse the document */ try { dparserparse(a_fileName); m_doc = dparsergetDocument(); } catch (SAXException e) { Systemerrprintln(e); Systemexit(-1); } catch (IOException e) { Systemerrprintln(e); Systemexit(-1); } } private Document getDocument () { return m_doc; }
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/* Recursively print out element nodes */ private void printNodeAndTraverse (Node node) { /* Print only element nodes */ if (nodegetNodeType() == NodeELEMENT_NODE) Systemoutprintln("NODE = "+nodegetNodeName()); /* Call recursively for each child */
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44 NodeList childList = nodegetChildNodes(); 45 if (childList != null) { 46 for (int i=0; i< childListgetLength(); i++) 47 printNodeAndTraverse(childListitem(i)); 48 } 49 } 50 51 public static void main (String[] args) 52 { 53 /* Create the DOM */ 54 SimpleDom d = new SimpleDom(args[0]); 55 56 /* Traverse all children and print out the names of the nodes */ 57 dprintNodeAndTraverse(dgetDocument()); 58 } 59 }
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The main things to notice here are
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Line 17, where the parser is created Line 21, where the entire document is first parsed into a tree data structure Lines 37 through 49, where the document is recursively walked with the element nodes being output in the process
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If we compile and run this code via
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% java SimpleDom gamesxml
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its execution results in
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NODE NODE NODE NODE NODE NODE NODE NODE NODE
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= = = = = = = = =
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gameList game name model price game name model price
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To parse the same XML document using SAX, the implementation in Listing 12-6 is required Listing 12-6 Parsing Using the SAX Approach
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1 2 3 4 5 6 7 8 9
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import import import import import import
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orgapachexercesparsersSAXParser; orgxmlsaxAttributes; orgxmlsaxhelpersDefaultHandler; orgxmlsaxSAXParseException; orgxmlsaxSAXException; javaioIOException;
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public class SimpleSax extends DefaultHandler
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10 { 11 public SimpleSax(String a_file) 12 { 13 /* Create the parser */ 14 SAXParser sparser = new SAXParser(); 15 16 /* Set the content handler */ 17 sparsersetContentHandler(this); 18 19 /* Parse */ 20 try { 21 sparserparse(a_file); 22 } 23 catch (SAXException e) { 24 Systemerrprintln(e); 25 } 26 catch (IOException e) { 27 Systemerrprintln(e); 28 } 29 } 30 31 public void startElement (String a_uri, String a_localName, 32 String a_qName, Attributes a_attributes) 33 { 34 Systemoutprintln("NODE = "+a_localName); 35 } 36 37 public static void main (String[] args) 38 { 39 new SimpleSax(args[0]); 40 } 41 }
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The key parts of this code are
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Lines 8 and 9, where our SimpleSax class extends the SAX DefaultHandler class Line 14, where the parser is created Line 17, where we let the parser know what the handler (our class) will be Line 21, where we start to parse the file (not completed immediately) Lines 31 through 35, the callback function, which is invoked per XML document element, here during the execution of the parse() call made in line 21
In a comparison, we notice that DOM appears very straightforward and simple, although it's a bit longer than SAX However, at least we can easily envision the process of execution In contrast, SAX forces us to extend a handler and possibly implement some of its methods (ie, startElement()) Also, our processing needs are possibly complicated by SAX's eventdriven basis In particular, SAX often requires data structures that keep state information For example, if the goal of our XML parsing is to count if there are at least two games in the document, we have to keep a global counter that increments every time the SAX callback is called This example is admittedly simple, but it should make it clear that SAX-based processing, while sometimes more efficient, is inherently more complex than DOM-based processing
XML-Related Technologies
I'm only touching the tip of the iceberg of XML in the summary given here, but it's enough for the discussion later in this chapter What should be minimally clear is that XML
Enables data to be portable: Using a DTD, an XML document can be interpreted by any processor, on any platform Provides structure, such as hierarchical information Is "human legible": Unlike other binary-encoded documents, we can easily see and make sense of what's contained in an XML document Is extensible: You can define and use whatever schemas make sense for your needs Is simply an open standard and is not owned by one company
These five basic points make XML an exciting language for data interchange between enterprises XML provides the structure and extensibility that HTML lacks, and it separates data from presentation It's also easy to debug, unlike more cryptic data interchange technologies like Electronic Data Interchange (EDI) Communication to and from Web services, as well as the advertisement of those services, is phrased in XML Thus, it's important that we not only understand XML, but also consider issues related to its efficiency