// Copyright (c) 2000 Just Objects B.V. <just@justobjects.nl>// Distributable under LGPL license. See terms of license at gnu.org.package nl.justobjects.pushlet.core;import java.io.*;import java.util.HashMap;/** * Parses XML into Event objects. * * @author Just van den Broecke - Just Objects &copy; * @version $Id: EventParser.java,v 1.3 2007/11/23 14:33:07 justb Exp $ */public class EventParser {	private EventParser() {	}	/**	 * Parse Event from a File.	 */	public static Event parse(File aFile) throws IOException {		BufferedReader br = new BufferedReader(new FileReader(aFile));		return parse(br);	}	/**	 * Parse Event from input Reader.	 */	public static Event parse(Reader aReader) throws IOException {		StringBuffer preparsedString = new StringBuffer(24);		// First find the opening tag ('<')		char nextChar;		while ((nextChar = (char) aReader.read()) != '<') ;		// Append '<'		preparsedString.append(nextChar);		// Then find end-tag ('>'), appending all chars to preparsed string.		do {			nextChar = (char) aReader.read();			preparsedString.append(nextChar);		} while (nextChar != '>');		return parse(preparsedString.toString());	}	/**	 * Parse Event from a String.	 */	public static Event parse(String aString) throws IOException {		aString = aString.trim();		if (!aString.startsWith("<") || !aString.endsWith("/>")) {			throw new IOException("No start or end tag found while parsing event [" + aString + "]");		}		// Create the attributes object.		HashMap properties = new HashMap(3);		// Remove the start and end (< ... />) from the string		aString = aString.substring(1, aString.length() - 2).trim();		int index = 0;		// Parse the tag		while (!Character.isWhitespace(aString.charAt(index))				&& (index < aString.length())) {			index++;		}		// We don't use the tag: remove from string		aString = aString.substring(index).trim();		index = 0;		String attrName;		String attrValue;		while (index < aString.length()) {			// Parse attribute name			while ((aString.charAt(index) != '=')					&& (index < aString.length())) {				index++;			}			// Create attr name string			attrName = aString.substring(0, index).trim();			// remove the attributeName and the '=' from the string			aString = aString.substring(index + 1).trim();			index = 1;	// read past the first wrapping "\""			// Parse attribute value			while ((aString.charAt(index) != '\"')					&& (index < aString.length())) {				// bypass the special characters '\' and '"' inside the				// attributevalue itself which are deliniated with a preceding				// '\'				if (aString.charAt(index) == '\\') {					aString = aString.substring(0, index)							+ aString.substring(index + 1);	// remove the '\'				}				index++;			}			// create the attribute value; exclude the wrapping quote-characters			attrValue = aString.substring(1, index);			// Set the attribute N/V			properties.put(attrName, attrValue);			aString = aString.substring(index + 1).trim();			index = 0;		}		return new Event(properties);	}	/**	 * Test method: use files to test.	 */	public static void main(String[] args) {		try {			Event event = parse(new File(args[0]));			System.out.println("OK parsed Event file " + args[0]);			System.out.println(event.toXML());			event = parse(event.toXML());			System.out.println("OK parsed Event string");			System.out.println(event.toXML());		} catch (Throwable t) {			System.out.println("Error parsing event file: " + args[0]);			t.printStackTrace();		}	}}/*  * $Log: EventParser.java,v $  * Revision 1.3  2007/11/23 14:33:07  justb  * core classes now configurable through factory  *  * Revision 1.2  2006/05/06 00:10:11  justb  * various chgs but not too serious...  *  * Revision 1.1  2005/02/18 10:07:23  justb  * many renamings of classes (make names compact)  *  * Revision 1.3  2004/09/03 22:35:37  justb  * Almost complete rewrite, just checking in now  *  * Revision 1.2  2003/08/15 08:37:40  justb  * fix/add Copyright+LGPL file headers and footers  *  * Revision 1.1  2003/05/18 16:12:27  justb  * adding support for XML encoded Events  *  */