xmlparser.java

这是一个非常优秀的可以自己定义复杂任务调度配置的框架

/**
 *  This file is part of the jcrontab package
 *  Copyright (C) 2001-2003 Israel Olalla
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA 02111-1307, USA
 *
 *  For questions, suggestions:
 *
 *  [e-mail]
 *
 */
package org.jcrontab.data;
 
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.io.*;
import java.util.*;
import java.text.*;
import org.jcrontab.data.CrontabEntryBean;

/** 
 * Manages the creation and execution of all the scheduled tasks 
 * of jcrontab. This class is the core of the jcrontab
 * @author $Author: iolalla $
 * @version $Revision: 1.6 $
 */

public class XMLParser extends DefaultHandler {

	// Flags to help us capture the contents 
	// of a tagged element.
	private Vector list = new Vector();
	private CrontabEntryBean ceb = null;

	// Buffer for collecting data from
	// the "characters" SAX event.
	private CharArrayWriter contents = new CharArrayWriter();
    private String formatDate = "dd/MM/yy";
    
    private CrontabParser cp = new CrontabParser();

	// Override methods of the DefaultHandler class
	// to gain notification of SAX Events.
	//
    // See org.xml.sax.ContentHandler for all available events.
    /**
    *@see org.xml.sax.helpers.DefaultHandler
    */
	public void startElement( String namespaceURI,
			 	  String localName,
				  String qName,
				  Attributes attr ) throws SAXException {
		contents.reset();
        if ( localName.equals("crontabentry")) {
                ceb = new CrontabEntryBean();
                ceb.setId(Integer.parseInt(attr.getValue("id")));
                list.addElement( ceb );
        }
        if ( localName.equals("enddate") || localName.equals("startdate")) {
            if ( attr.getValue("format") != null && attr.getValue("format") != "" ) {
                    formatDate = attr.getValue("format");
            }
		}
	}
	/**
    *@see org.xml.sax.helpers.DefaultHandler
    */
	public void endElement( String namespaceURI,
			 	  String localName,
				  String qName ) throws SAXException {
        if ( localName.equals( "seconds" ) ) {
            String seconds = contents.toString();
            ceb.setSeconds(contents.toString());
		}
        if ( localName.equals( "minutes" ) ) {
			ceb.setMinutes(contents.toString());
		}	
        if ( localName.equals( "hours" ) ) {
			ceb.setHours(contents.toString());
		}	
        if ( localName.equals( "daysofweek" ) ) {
			ceb.setDaysOfWeek(contents.toString());
		}
        if ( localName.equals( "months" ) ) {
			ceb.setMonths(contents.toString());
		}
        if ( localName.equals( "daysofmonth" ) ) {
			ceb.setDaysOfMonth(contents.toString());
		}
        if ( localName.equals( "years" ) ) {
			ceb.setYears(contents.toString());
		}
        if ( localName.equals( "class" ) ) {
			ceb.setClassName(contents.toString());
		}
        if ( localName.equals( "method" ) ) {
			ceb.setMethodName(contents.toString());
		}
		if ( localName.equals("startdate" )) {
            ParsePosition parsePosition = new ParsePosition(0);
            SimpleDateFormat sdf = new SimpleDateFormat(formatDate);
            Date date = sdf.parse(contents.toString(), parsePosition);
			ceb.setStartDate(date);
		}
        if ( localName.equals("enddate" )) {
            ParsePosition parsePosition = new ParsePosition(0);
            SimpleDateFormat sdf = new SimpleDateFormat(formatDate);
            Date date = sdf.parse(contents.toString(), parsePosition);
			ceb.setEndDate(date);
		}
        if ( localName.equals("parameters" )) {
            String[] result = contents.toString().split("\\s");
			ceb.setExtraInfo(result);
		}
        if ( localName.equals("description" )) {
			ceb.setDescription(contents.toString());
		}
	}
    /**
    *@see org.xml.sax.helpers.DefaultHandler
    */
    public void characters( char[] ch, int start, int length )
                  throws SAXException {
      contents.write( ch, start, length );
    }
    
	private Vector getList() {
        	return list;
	}
    /**
    * Convert the array of CrontabEntryBean to a valid xml representation of
    * them, basically calling to the toXML() method of the CrontabEntryBean
    * @param String xmlFile the xmlFile where the CrontabEntryBean are stored
    * @return CrontabEntryBean[] the beans behind this InputSource
    */
	public CrontabEntryBean[] unMarshall(String xmlFile) throws Exception {
        return unMarshall(new InputSource(new FileInputStream(xmlFile)));
	}
    /**
    * Convert the array of CrontabEntryBean to a valid xml representation of
    * them, basically calling to the toXML() method of the CrontabEntryBean
    * @param InputSource is the inputSource where the xml is stored
    * @return CrontabEntryBean[] the beans behind this InputSource
    */
    public CrontabEntryBean[] unMarshall(InputSource is) throws Exception {
        			// Create SAX 2 parser...
			XMLReader xr = XMLReaderFactory.createXMLReader();
			// Set the ContentHandler...
			XMLParser parser = new XMLParser();
			xr.setContentHandler( parser );
			// Parse the file...
			xr.parse(is);
                      
			Vector items = parser.getList();
            CrontabEntryBean[] cebs = new CrontabEntryBean[items.size()];
            for (int i = 0; i < cebs.length; i++) {
               cebs[i] = cp.completeTheMarshalling((CrontabEntryBean)items.get(i));
            }
            return cebs;
    }
    /**
    * Convert the array of CrontabEntryBean to a valid xml representation of
    * them, basically calling to the toXML() method of the CrontabEntryBean
    * @param CrontabEntryBean[] the CrontabEntryBeans
    * @return String The xml representing all this Beans
    */
    public String marshall(CrontabEntryBean[] cebs) {
        StringBuffer sb = new StringBuffer();
        sb.append("<?xml version=\"1.0\"?>\n");
        sb.append("<!DOCTYPE crontab SYSTEM \"crontab.dtd\">\n");
        sb.append("<crontab>\n");
        for (int i=0; i<cebs.length;i++)
            sb.append(cebs[i].toXML());
        sb.append("</crontab>\n");
        return sb.toString();
    }
}