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import org.xml.sax.*; |
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import javax.xml.parsers.SAXParserFactory; |
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import javax.xml.parsers.ParserConfigurationException; |
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import javax.xml.parsers.SAXParser; |
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import javax.xml.parsers.SAXParserFactory; |
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import javax.xml.parsers.ParserConfigurationException; |
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import javax.xml.parsers.SAXParser; |
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// Paul Mutton, pjm2@ukc.ac.uk |
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// XMLPacketMaker - Creates an XMLPacket object. |
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public class XMLPacketMaker extends HandlerBase { |
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public XMLPacketMaker () { |
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// default no-args constructor. |
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} |
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// Constructor for accepting a reference to an XMLPacket |
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public XMLPacketMaker (XMLPacket packet) { |
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this.packet = packet; |
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} |
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public static void main(String[] args){ |
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if (args.length != 1) { |
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System.err.println ("Usage: cmd filename"); |
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// Set up output stream |
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out = new OutputStreamWriter (System.out, "UTF8"); |
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// Create the XMLPacket to store values in. |
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packet = new XMLPacket(); |
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// Parse the input |
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SAXParser saxParser = factory.newSAXParser(); |
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saxParser.parse(new File(args[0]), new XMLPacketMaker()); |
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saxParser.parse(new File(args[0]), new XMLPacketMaker(packet)); |
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// Print out the entire contents of the packet's HashMap. |
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System.out.println("XMLPacket contents: -"); |
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packet.printAll(); |
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} catch (Throwable t) { |
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t.printStackTrace (); |
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System.out.println("The recieved packet did not contain valid XML, so I'm gonna reject it."); |
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//t.printStackTrace (); |
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} |
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System.exit (0); |
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} |
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private String indentString = " "; // Amount to indent |
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private int indentLevel = 0; |
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// For storing the tag heirarchy. |
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private ArrayList tagList = new ArrayList(); |
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static private XMLPacket packet = null; |
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//=========================================================== |
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// SAX DocumentHandler methods |
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//=========================================================== |
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public void startDocument () throws SAXException { |
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nl(); |
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nl(); |
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emit ("START DOCUMENT"); |
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nl(); |
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emit ("<?xml version='1.0' encoding='UTF-8'?>"); |
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// No purpose currently. |
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} |
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public void endDocument () throws SAXException { |
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nl(); emit ("END DOCUMENT"); |
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try { |
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nl(); |
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out.flush (); |
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} catch (IOException e) { |
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throw new SAXException ("I/O error", e); |
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} |
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// No purpose currently. |
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} |
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// Add each tag's attribute to the XMLPacket. |
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// Note that all attributes within an opening tag are |
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// stored as "someroot.sometag.attributes.attribute_name" |
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// E.g. If <packet> is the root node, then: |
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// <packet machine_name="raptor"> |
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// is stored as: |
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// "packet.attributes.machine_name" |
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// within the XMLPacket. |
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public void startElement (String name, AttributeList attrs) throws SAXException { |
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indentLevel++; |
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nl(); emit ("ELEMENT: "); |
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emit ("<"+name); |
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tagList.add(name); |
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if (attrs != null) { |
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for (int i = 0; i < attrs.getLength (); i++) { |
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nl(); |
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emit(" ATTR: "); |
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emit (attrs.getName (i)); |
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emit ("\t\""); |
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emit (attrs.getValue (i)); |
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emit ("\""); |
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packet.addParam(getPath()+".attributes."+attrs.getName(i), attrs.getValue(i)); |
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} |
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} |
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if (attrs.getLength() > 0) nl(); |
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emit (">"); |
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} |
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// When an XML element is finished with, we must remove |
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// the tag name from the tagList and decrement the indent |
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// level. |
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public void endElement (String name) throws SAXException { |
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nl(); |
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emit ("END_ELM: "); |
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emit ("</"+name+">"); |
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tagList.remove(tagList.size()-1); |
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indentLevel--; |
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} |
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// Any text falling within a pair of terminal tags must |
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// be added to the XMLPacket. Trim leading and trailing |
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// spaces and do not bother to add if there is no data |
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// specified within the tags. |
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public void characters (char[] buf, int offset, int len) throws SAXException { |
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nl(); emit ("CHARS: "); |
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String s = new String(buf, offset, len); |
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if (!s.trim().equals("")) emit (s); |
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if (!s.trim().equals("")) { |
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packet.addParam(getPath(), s); |
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} |
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} |
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//=========================================================== |
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// Helpers ... |
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//=========================================================== |
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// Wrap I/O exceptions in SAX exceptions, to |
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// suit handler signature requirements |
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private void emit (String s) throws SAXException { |
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try { |
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out.write (s); |
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out.flush (); |
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} catch (IOException e) { |
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throw new SAXException ("I/O error", e); |
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// Return the heirarchical string to be used as a key value |
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// in the XMLPacket. |
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private String getPath () { |
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String path = (String)tagList.get(0); |
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if (tagList.size() > 0) { |
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for (int i = 1 ; i < tagList.size() ; i++) { |
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path = path + "." + (String)tagList.get(i); |
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} |
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} |
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return path; |
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} |
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// Start a new line |
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// and indent the next line appropriately |
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private void nl () throws SAXException { |
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String lineEnd = System.getProperty("line.separator"); |
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try { |
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out.write (lineEnd); |
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for (int i=0; i < indentLevel; i++) out.write(indentString); |
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} catch (IOException e) { |
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throw new SAXException ("I/O error", e); |
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} |
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} |
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} |
