// EventDemo.java: demonstration application showing Æfred's event stream.
// NO WARRANTY! See README, and copyright below.
// Modified 11/8/98 to add package statement.
package com.microstar.xml.demo;

/**
 * Demonstration application showing Æfred's event stream.
 * <p>Usage: <code>java EventDemo &lt;url&gt;</code>
 * <p>Or, use it as an applet, supplying the URL as the <code>url</code>
 * parameter.
 * @author Copyright (c) 1997, 1998 by Microstar Software Ltd.;
 * @author written by David Megginson &lt;dmeggins@microstar.com&gt;
 * @version 1.1
 * @since Ptolemy II 0.2
 * @see com.microstar.xml.XmlParser
 * @see com.microstar.xml.XmlHandler
 * @see XmlApp
 */
public class EventDemo extends XmlApp {
    /**
     * Entry point for an application.
     */
    public static void main(String[] args) throws Exception {
        EventDemo demo = new EventDemo();

        if (args.length != 1) {
            System.err.println("java EventDemo <uri>");
            System.exit(1);
        } else {
            demo.doParse(args[0]);
        }
    }

    /**
     * Resolve an entity and print an event.
     * @see com.microstar.xml.XmlHandler#resolveEntity
     */
    public Object resolveEntity(String publicId, String systemId) {
        displayText("Resolving entity: pubid=" + publicId + ", sysid="
                + systemId);
        return null;
    }

    public void startExternalEntity(String systemId) {
        displayText("Starting external entity:  " + systemId);
    }

    public void endExternalEntity(String systemId) {
        displayText("Ending external entity:  " + systemId);
    }

    /**
     * Handle the start of the document by printing an event.
     * @see com.microstar.xml.XmlHandler#startDocument
     */
    public void startDocument() {
        displayText("Start document");
    }

    /**
     * Handle the end of the document by printing an event.
     * @see com.microstar.xml.XmlHandler#endDocument
     */
    public void endDocument() {
        displayText("End document");
    }

    /**
     * Handle a DOCTYPE declaration by printing an event.
     * @see com.microstar.xml.XmlHandler#doctypeDecl
     */
    public void doctypeDecl(String name, String pubid, String sysid) {
        displayText("Doctype declaration:  " + name + ", pubid=" + pubid
                + ", sysid=" + sysid);
    }

    /**
     * Handle an attribute value assignment by printing an event.
     * @see com.microstar.xml.XmlHandler#attribute
     */
    public void attribute(String name, String value, boolean isSpecified) {
        String s;

        if (isSpecified) {
            s = " (specified)";
        } else {
            s = " (defaulted)";
        }

        displayText("Attribute:  name=" + name + ", value=" + value + s);
    }

    /**
     * Handle the start of an element by printing an event.
     * @see com.microstar.xml.XmlHandler#startElement
     */
    public void startElement(String name) {
        displayText("Start element:  name=" + name);
    }

    /**
     * Handle the end of an element by printing an event.
     * @see com.microstar.xml.XmlHandler#endElement
     */
    public void endElement(String name) {
        displayText("End element:  " + name);
    }

    /**
     * Handle character data by printing an event.
     * @see com.microstar.xml.XmlHandler#charData
     */
    public void charData(char[] ch, int start, int length) {
        displayText("Character data:  \"" + escape(ch, length) + '"');
    }

    /**
     * Handle ignorable whitespace by printing an event.
     * @see com.microstar.xml.XmlHandler#ignorableWhitespace
     */
    public void ignorableWhitespace(char[] ch, int start, int length) {
        displayText("Ignorable whitespace:  \"" + escape(ch, length) + '"');
    }

    /**
     * Handle a processing instruction by printing an event.
     * @see com.microstar.xml.XmlHandler#processingInstruction
     */
    public void processingInstruction(String target, String data) {
        displayText("Processing Instruction:  " + target + ' '
                + escape(data.toCharArray(), data.length()));
    }
}

// end of EventDemo.java