ViewVC Help
View File | Revision Log | Show Annotations | Revision Graph | Root Listing
root/i-scream/experimental/server/XMLReader/XMLPacketParser.java
Revision: 1.3
Committed: Fri Nov 17 12:25:55 2000 UTC (23 years, 4 months ago) by pjm2
Branch: MAIN
CVS Tags: PROJECT_COMPLETION, HEAD
Changes since 1.2: +0 -2 lines
Log Message:
Added some echo's to the go file and some minor changes to XMLPacketParser

File Contents

# Content
1 import java.io.*;
2 import java.util.ArrayList;
3
4 import org.xml.sax.*;
5
6 import javax.xml.parsers.SAXParserFactory;
7 import javax.xml.parsers.ParserConfigurationException;
8 import javax.xml.parsers.SAXParser;
9
10 // Paul Mutton, pjm2@ukc.ac.uk
11
12 // XMLPacketParser - Creates an XMLPacket object.
13 public class XMLPacketParser extends HandlerBase {
14
15 // No-args constructor. Generally not used.
16 public XMLPacketParser () {
17 this.packet = new XMLPacket();
18 }
19
20 // Constructor for accepting a reference to an XMLPacket
21 public XMLPacketParser (XMLPacket packet) {
22 this.packet = packet;
23 }
24
25 // Accessor to the XMLPacket.
26 public XMLPacket getXMLPacket() {
27 return packet;
28 }
29
30 private int indentLevel = 0;
31 private ArrayList tagList = new ArrayList();
32 private XMLPacket packet;
33
34 //===========================================================
35 // SAX DocumentHandler methods
36 //===========================================================
37
38 public void startDocument () throws SAXException {
39 System.out.println("XMLPacketParser - Starting parse process...");
40 }
41
42 public void endDocument () throws SAXException {
43 System.out.println("XMLPacketParser - I just finished parsing an XML String.");
44 }
45
46 // Add each tag's attribute to the XMLPacket.
47 // Note that all attributes within an opening tag are
48 // stored as "someroot.sometag.attributes.attribute_name"
49 // E.g. If <packet> is the root node, then:
50 // <packet machine_name="raptor">
51 // is stored as:
52 // "packet.attributes.machine_name"
53 // within the XMLPacket.
54 public void startElement (String name, AttributeList attrs) throws SAXException {
55 indentLevel++;
56 tagList.add(name);
57 if (attrs != null) {
58 for (int i = 0; i < attrs.getLength (); i++) {
59 packet.addParam(getPath()+".attributes."+attrs.getName(i), attrs.getValue(i));
60 }
61 }
62 }
63
64 // When an XML element is finished with, we must remove
65 // the tag name from the tagList and decrement the indent
66 // level.
67 public void endElement (String name) throws SAXException {
68 tagList.remove(tagList.size()-1);
69 indentLevel--;
70 }
71
72 // Any text falling within a pair of terminal tags must
73 // be added to the XMLPacket. Trim leading and trailing
74 // spaces and do not bother to add if there is no data
75 // specified within the tags.
76 public void characters (char[] buf, int offset, int len) throws SAXException {
77 String s = new String(buf, offset, len);
78 if (!s.trim().equals("")) {
79 packet.addParam(getPath(), s);
80 }
81 }
82
83
84 //===========================================================
85 // Helpers ...
86 //===========================================================
87
88
89 // Return the heirarchical string to be used as a key value
90 // in the XMLPacket.
91 private String getPath () {
92 String path = (String)tagList.get(0);
93 if (tagList.size() > 0) {
94 for (int i = 1 ; i < tagList.size() ; i++) {
95 path = path + "." + (String)tagList.get(i);
96 }
97 }
98 return path;
99 }
100
101 }