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: -
            

        } 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((String)tagList.get(tagList.size()-1), 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);
        }
    }
}
Revision:	1.5
Committed:	Tue Nov 14 10:04:01 2000 UTC (24 years ago) by pjm2
Branch:	MAIN
Changes since 1.4:	+24 -2 lines
Log Message:	Incorporated the XMLPacket features into the XMLPacketMaker class. Now reads simple parameter values from XML into the hash map.
#	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
43	pjm2	1.3
44			} catch (Throwable t) {
45			t.printStackTrace ();
46			}
47			System.exit (0);
48			}
49
50			static private Writer out;
51			private String indentString = " "; // Amount to indent
52			private int indentLevel = 0;
53
54	pjm2	1.4	// For storing the tag heirarchy.
55	pjm2	1.3	private ArrayList tagList = new ArrayList();
56	pjm2	1.5	static private XMLPacket packet = null;
57	pjm2	1.3
58			//===========================================================
59			// SAX DocumentHandler methods
60			//===========================================================
61
62			public void startDocument () throws SAXException {
63			nl();
64			nl();
65			emit ("START DOCUMENT");
66			nl();
67			emit ("<?xml version='1.0' encoding='UTF-8'?>");
68			}
69
70			public void endDocument () throws SAXException {
71			nl(); emit ("END DOCUMENT");
72			try {
73			nl();
74			out.flush ();
75			} catch (IOException e) {
76			throw new SAXException ("I/O error", e);
77			}
78			}
79
80			public void startElement (String name, AttributeList attrs) throws SAXException {
81			indentLevel++;
82	pjm2	1.5	tagList.add(name);
83	pjm2	1.3	nl(); emit ("ELEMENT: ");
84			emit ("<"+name);
85			if (attrs != null) {
86			for (int i = 0; i < attrs.getLength (); i++) {
87			nl();
88			emit(" ATTR: ");
89			emit (attrs.getName (i));
90			emit ("\t\"");
91			emit (attrs.getValue (i));
92			emit ("\"");
93			}
94			}
95			if (attrs.getLength() > 0) nl();
96			emit (">");
97			}
98
99			public void endElement (String name) throws SAXException {
100			nl();
101			emit ("END_ELM: ");
102			emit ("</"+name+">");
103	pjm2	1.5	tagList.remove(tagList.size()-1);
104	pjm2	1.3	indentLevel--;
105			}
106
107			public void characters (char[] buf, int offset, int len) throws SAXException {
108			nl(); emit ("CHARS: ");
109			String s = new String(buf, offset, len);
110	pjm2	1.5	if (!s.trim().equals("")) {
111			emit (s);
112			packet.addParam((String)tagList.get(tagList.size()-1), s);
113			}
114	pjm2	1.3	}
115
116			//===========================================================
117			// Helpers ...
118			//===========================================================
119
120			// Wrap I/O exceptions in SAX exceptions, to
121			// suit handler signature requirements
122			private void emit (String s) throws SAXException {
123			try {
124			out.write (s);
125			out.flush ();
126			} catch (IOException e) {
127			throw new SAXException ("I/O error", e);
128			}
129			}
130
131			// Start a new line
132			// and indent the next line appropriately
133			private void nl () throws SAXException {
134			String lineEnd = System.getProperty("line.separator");
135			try {
136			out.write (lineEnd);
137			for (int i=0; i < indentLevel; i++) out.write(indentString);
138			} catch (IOException e) {
139			throw new SAXException ("I/O error", e);
140			}
141			}
142			}