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 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");

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

        } 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();

    //===========================================================
    // 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++;
        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+">");
        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);
    }

    //===========================================================
    // 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:	1.4
Committed:	Tue Nov 14 09:48:06 2000 UTC (24 years ago) by pjm2
Branch:	MAIN
Changes since 1.3:	+1 -0 lines
Log Message:	Created the XMLPacket class. This uses a hash map to store and access values by key strings.
#	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			public static void main(String[] args){
13			if (args.length != 1) {
14			System.err.println ("Usage: cmd filename");
15			System.exit (1);
16			}
17
18			// Use the default (non-validating) parser
19			SAXParserFactory factory = SAXParserFactory.newInstance();
20			try {
21			// Set up output stream
22			out = new OutputStreamWriter (System.out, "UTF8");
23
24			// Parse the input
25			SAXParser saxParser = factory.newSAXParser();
26			saxParser.parse(new File(args[0]), new XMLPacketMaker());
27
28			} catch (Throwable t) {
29			t.printStackTrace ();
30			}
31			System.exit (0);
32			}
33
34			static private Writer out;
35			private String indentString = " "; // Amount to indent
36			private int indentLevel = 0;
37
38	pjm2	1.4	// For storing the tag heirarchy.
39	pjm2	1.3	private ArrayList tagList = new ArrayList();
40
41			//===========================================================
42			// SAX DocumentHandler methods
43			//===========================================================
44
45			public void startDocument () throws SAXException {
46			nl();
47			nl();
48			emit ("START DOCUMENT");
49			nl();
50			emit ("<?xml version='1.0' encoding='UTF-8'?>");
51			}
52
53			public void endDocument () throws SAXException {
54			nl(); emit ("END DOCUMENT");
55			try {
56			nl();
57			out.flush ();
58			} catch (IOException e) {
59			throw new SAXException ("I/O error", e);
60			}
61			}
62
63			public void startElement (String name, AttributeList attrs) throws SAXException {
64			indentLevel++;
65			nl(); emit ("ELEMENT: ");
66			emit ("<"+name);
67			if (attrs != null) {
68			for (int i = 0; i < attrs.getLength (); i++) {
69			nl();
70			emit(" ATTR: ");
71			emit (attrs.getName (i));
72			emit ("\t\"");
73			emit (attrs.getValue (i));
74			emit ("\"");
75			}
76			}
77			if (attrs.getLength() > 0) nl();
78			emit (">");
79			}
80
81			public void endElement (String name) throws SAXException {
82			nl();
83			emit ("END_ELM: ");
84			emit ("</"+name+">");
85			indentLevel--;
86			}
87
88			public void characters (char[] buf, int offset, int len) throws SAXException {
89			nl(); emit ("CHARS: ");
90			String s = new String(buf, offset, len);
91			if (!s.trim().equals("")) emit (s);
92			}
93
94			//===========================================================
95			// Helpers ...
96			//===========================================================
97
98			// Wrap I/O exceptions in SAX exceptions, to
99			// suit handler signature requirements
100			private void emit (String s) throws SAXException {
101			try {
102			out.write (s);
103			out.flush ();
104			} catch (IOException e) {
105			throw new SAXException ("I/O error", e);
106			}
107			}
108
109			// Start a new line
110			// and indent the next line appropriately
111			private void nl () throws SAXException {
112			String lineEnd = System.getProperty("line.separator");
113			try {
114			out.write (lineEnd);
115			for (int i=0; i < indentLevel; i++) out.write(indentString);
116			} catch (IOException e) {
117			throw new SAXException ("I/O error", e);
118			}
119			}
120			}