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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.util; |
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|
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//---IMPORTS--- |
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import java.io.*; |
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import java.util.ArrayList; |
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|
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import org.xml.sax.*; |
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import org.xml.sax.helpers.*; |
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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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|
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/** |
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* XMLStringParser - Used to assist in creating XMLPacket objects. |
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* |
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* @author $Author: pjm2 $ |
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* @version $Id: XMLStringParser.java,v 1.7 2001/01/29 15:36:33 pjm2 Exp $ |
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*/ |
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public class XMLStringParser extends DefaultHandler { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision: 1.7 $"; |
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|
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//---STATIC METHODS--- |
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|
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//---CONSTRUCTORS--- |
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|
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/** |
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* No-args constructor. Generally not used. |
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*/ |
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public XMLStringParser () { |
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this.packet = new XMLPacket(); |
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} |
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|
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/** |
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* Constructor for accepting a reference to an XMLPacket |
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*/ |
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public XMLStringParser (XMLPacket packet) { |
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this.packet = packet; |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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/** |
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* Accessor to the XMLPacket. |
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*/ |
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public XMLPacket getXMLPacket() { |
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return packet; |
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} |
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|
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//=========================================================== |
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// SAX DocumentHandler methods |
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//=========================================================== |
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|
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public void startDocument () throws SAXException { |
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//System.out.println("XMLPacketParser - Starting parse process..."); |
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} |
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|
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public void endDocument () throws SAXException { |
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//System.out.println("XMLPacketParser - I just finished parsing an XML String."); |
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} |
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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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*/ |
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public void startElement (String name, Attributes attrs) throws SAXException { |
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indentLevel++; |
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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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packet.addParam(getPath()+".attributes."+attrs.getLocalName(i), attrs.getValue(i)); |
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} |
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} |
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} |
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|
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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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*/ |
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public void endElement (String name) throws SAXException { |
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tagList.remove(tagList.size()-1); |
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indentLevel--; |
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} |
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|
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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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*/ |
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public void characters (char[] buf, int offset, int len) throws SAXException { |
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String s = new String(buf, offset, len); |
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packet.addParam(getPath(), s); |
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} |
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|
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.ac.ukc.iscream.util.NameFormat class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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*/ |
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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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|
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//---PRIVATE METHODS--- |
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|
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//=========================================================== |
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// Helpers ... |
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//=========================================================== |
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|
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/** |
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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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*/ |
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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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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* To keep track of our identation level |
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*/ |
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private int indentLevel = 0; |
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|
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/** |
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* An ArrayList of tags |
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*/ |
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private ArrayList tagList = new ArrayList(); |
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|
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/** |
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* A reference to the XMLPacket we are making |
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*/ |
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private XMLPacket packet; |
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|
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = null; |
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|
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//---STATIC ATTRIBUTES--- |
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|
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} |
