server/XMLReader/XMLPacketMaker.java

import java.io.*;
import java.util.ArrayList;

import org.xml.sax.*;

import javax.xml.parsers.SAXParserFactory;  
import javax.xml.parsers.ParserConfigurationException;  
import javax.xml.parsers.SAXParser;  


public class XMLPacketMaker extends HandlerBase {

    public XMLPacketMaker () {
        // default no-args constructor.
    }

    // Constructor for accepting a reference to an XMLPacket
    public XMLPacketMaker (XMLPacket packet) {
        this.packet = packet;
    }

    public static void main(String[] args){
        if (args.length != 1) {
            System.err.println ("Usage: cmd filename");
            System.exit (1);
        }

        // Use the default (non-validating) parser
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            // Set up output stream
            out = new OutputStreamWriter (System.out, "UTF8");

            // Create the XMLPacket to store values in.
            packet = new XMLPacket();

            // Parse the input
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse(new File(args[0]), new XMLPacketMaker(packet));

            // Print out some things from the packet: -
            System.out.println("bung.wibble="+packet.getParam("bung.wibble"));
            System.out.println("bung.ping.value1="+packet.getParam("bung.ping.value1"));
            

        } catch (Throwable t) {
            t.printStackTrace ();
        }
        System.exit (0);
    }

    static private Writer out;
    private String indentString = "    "; // Amount to indent
    private int indentLevel = 0;

    // For storing the tag heirarchy.
    private ArrayList tagList = new ArrayList();
    static private XMLPacket packet = null;

    //===========================================================
    // SAX DocumentHandler methods
    //===========================================================

    public void startDocument () throws SAXException {
        nl();
        nl();
        emit ("START DOCUMENT");
        nl();
        emit ("<?xml version='1.0' encoding='UTF-8'?>");
    }

    public void endDocument () throws SAXException {
        nl(); emit ("END DOCUMENT");
        try {
            nl();
            out.flush ();
        } catch (IOException e) {
            throw new SAXException ("I/O error", e);
        }
    }

    public void startElement (String name, AttributeList attrs) throws SAXException {
        indentLevel++;
        tagList.add(name);
        nl(); emit ("ELEMENT: ");
        emit ("<"+name);
        if (attrs != null) {
            for (int i = 0; i < attrs.getLength (); i++) {
                nl();
                emit("   ATTR: ");
                emit (attrs.getName (i));
                emit ("\t\"");
                emit (attrs.getValue (i));
                emit ("\"");
            }
        }
        if (attrs.getLength() > 0) nl();
        emit (">");
    }

    public void endElement (String name) throws SAXException {
        nl();
        emit ("END_ELM: ");
        emit ("</"+name+">");
        tagList.remove(tagList.size()-1);    
        indentLevel--;
    }

    public void characters (char[] buf, int offset, int len) throws SAXException {
        nl(); emit ("CHARS:   ");
        String s = new String(buf, offset, len);
        if (!s.trim().equals("")) {
            emit (s);
            packet.addParam(getPath(), s);
        }
    }

    //===========================================================
    // Helpers ...
    //===========================================================

    // Wrap I/O exceptions in SAX exceptions, to
    // suit handler signature requirements
    private void emit (String s) throws SAXException {
        try {
            out.write (s);
            out.flush ();
        } catch (IOException e) {
            throw new SAXException ("I/O error", e);
        }
    }

    // Start a new line
    // and indent the next line appropriately
    private void nl () throws SAXException {
        String lineEnd =  System.getProperty("line.separator");
        try {
            out.write (lineEnd);
            for (int i=0; i < indentLevel; i++) out.write(indentString);
        } catch (IOException e) {
            throw new SAXException ("I/O error", e);
        }
    }
    
    private String getPath () {
        String path = (String)tagList.get(0);
        if (tagList.size() > 0) {
            for (int i = 1 ; i < tagList.size() ; i++) {
                path = path + "." + (String)tagList.get(i);
            }
        }
        return path;
    }
}
Revision:	1.6
Committed:	Tue Nov 14 10:15:54 2000 UTC (23 years, 5 months ago) by pjm2
Branch:	MAIN
Changes since 1.5:	+13 -1 lines
Log Message:	This version still contains a main method for testing purposes. It works fine, creating an XMLPacket object. Run with test.xml and you will find that the HashMap stores values with a heirarchical structure, such as bung.ping.value1="Can You".
#	User	Rev	Content
1	pjm2	1.3	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
11			public class XMLPacketMaker extends HandlerBase {
12	pjm2	1.5
13			public XMLPacketMaker () {
14			// default no-args constructor.
15			}
16
17			// Constructor for accepting a reference to an XMLPacket
18			public XMLPacketMaker (XMLPacket packet) {
19			this.packet = packet;
20			}
21
22	pjm2	1.3	public static void main(String[] args){
23			if (args.length != 1) {
24			System.err.println ("Usage: cmd filename");
25			System.exit (1);
26			}
27
28			// Use the default (non-validating) parser
29			SAXParserFactory factory = SAXParserFactory.newInstance();
30			try {
31			// Set up output stream
32			out = new OutputStreamWriter (System.out, "UTF8");
33
34	pjm2	1.5	// Create the XMLPacket to store values in.
35			packet = new XMLPacket();
36
37	pjm2	1.3	// Parse the input
38			SAXParser saxParser = factory.newSAXParser();
39	pjm2	1.5	saxParser.parse(new File(args[0]), new XMLPacketMaker(packet));
40
41			// Print out some things from the packet: -
42	pjm2	1.6	System.out.println("bung.wibble="+packet.getParam("bung.wibble"));
43			System.out.println("bung.ping.value1="+packet.getParam("bung.ping.value1"));
44	pjm2	1.5
45	pjm2	1.3
46			} catch (Throwable t) {
47			t.printStackTrace ();
48			}
49			System.exit (0);
50			}
51
52			static private Writer out;
53			private String indentString = " "; // Amount to indent
54			private int indentLevel = 0;
55
56	pjm2	1.4	// For storing the tag heirarchy.
57	pjm2	1.3	private ArrayList tagList = new ArrayList();
58	pjm2	1.5	static private XMLPacket packet = null;
59	pjm2	1.3
60			//===========================================================
61			// SAX DocumentHandler methods
62			//===========================================================
63
64			public void startDocument () throws SAXException {
65			nl();
66			nl();
67			emit ("START DOCUMENT");
68			nl();
69			emit ("<?xml version='1.0' encoding='UTF-8'?>");
70			}
71
72			public void endDocument () throws SAXException {
73			nl(); emit ("END DOCUMENT");
74			try {
75			nl();
76			out.flush ();
77			} catch (IOException e) {
78			throw new SAXException ("I/O error", e);
79			}
80			}
81
82			public void startElement (String name, AttributeList attrs) throws SAXException {
83			indentLevel++;
84	pjm2	1.5	tagList.add(name);
85	pjm2	1.3	nl(); emit ("ELEMENT: ");
86			emit ("<"+name);
87			if (attrs != null) {
88			for (int i = 0; i < attrs.getLength (); i++) {
89			nl();
90			emit(" ATTR: ");
91			emit (attrs.getName (i));
92			emit ("\t\"");
93			emit (attrs.getValue (i));
94			emit ("\"");
95			}
96			}
97			if (attrs.getLength() > 0) nl();
98			emit (">");
99			}
100
101			public void endElement (String name) throws SAXException {
102			nl();
103			emit ("END_ELM: ");
104			emit ("</"+name+">");
105	pjm2	1.5	tagList.remove(tagList.size()-1);
106	pjm2	1.3	indentLevel--;
107			}
108
109			public void characters (char[] buf, int offset, int len) throws SAXException {
110			nl(); emit ("CHARS: ");
111			String s = new String(buf, offset, len);
112	pjm2	1.5	if (!s.trim().equals("")) {
113			emit (s);
114	pjm2	1.6	packet.addParam(getPath(), s);
115	pjm2	1.5	}
116	pjm2	1.3	}
117
118			//===========================================================
119			// Helpers ...
120			//===========================================================
121
122			// Wrap I/O exceptions in SAX exceptions, to
123			// suit handler signature requirements
124			private void emit (String s) throws SAXException {
125			try {
126			out.write (s);
127			out.flush ();
128			} catch (IOException e) {
129			throw new SAXException ("I/O error", e);
130			}
131			}
132
133			// Start a new line
134			// and indent the next line appropriately
135			private void nl () throws SAXException {
136			String lineEnd = System.getProperty("line.separator");
137			try {
138			out.write (lineEnd);
139			for (int i=0; i < indentLevel; i++) out.write(indentString);
140			} catch (IOException e) {
141			throw new SAXException ("I/O error", e);
142			}
143	pjm2	1.6	}
144
145			private String getPath () {
146			String path = (String)tagList.get(0);
147			if (tagList.size() > 0) {
148			for (int i = 1 ; i < tagList.size() ; i++) {
149			path = path + "." + (String)tagList.get(i);
150			}
151			}
152			return path;
153	pjm2	1.3	}
154			}