package org.tizzit.cocoon.generic.transformation;
import java.io.IOException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import org.apache.avalon.excalibur.pool.Recyclable;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.transformation.AbstractTransformer;
import org.apache.log4j.Logger;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
/**
* Transformer parses input for tags with the namespace "jutil" and executes some transformation on them.</br>
* At present there are the following operations included:<br/>
* <ul>
* <li>transform a date in a given format optional in a language given</li>
* <li>calculate a new date with a difference in days given</li>
* </ul>
*
* <p><h5>Configuration:</h5>
* <pre>
* <map:transformer name="jutil" src="de.juwimm.cms.cocoon.transformation.UtilTransformer"/>
* </pre>
* </p>
* <p><h5>Usage:</h5>
* Just put code like this in your pipeline:
* <pre>
* <map:transform type="jutil"/>
* </pre>
* </p>
* <p>The input must be something like this:</br>
* <pre>
* <jutil:dateDiff xmlns:jutil="http://juwimm.net/conquest/util/1.0" dateFormat="yyyyMMdd" lang="german">
* <jutil:date diff="-14" dateFormat="yyyyMMdd">20050324</jutil:date>
* </jutil:dateDiff>
* </pre>
* Instead of giving a string containing the source-date, you can use the tag "jutil:currentDate"
* <pre>
* <jutil:date diff="-14" dateFormat="yyyyMMdd"><jutil:currentDate/><jutil:date>
* </pre>
* In this case the attribute "dateFormat" must be "yyyyMMdd".
* </p>
* <p>
* All formats must look like described in class SimpleDateFormat.<br/>
* All language-information must match the language-definitions in class Locale.
* @see java.text.SimpleDateFormat
* @see java.util.Locale
* </p>
* <p><h5>Result:</h5>
* The output will look like this:</br>
* <pre>
* <jutil:dateDiff xmlns:jutil="http://juwimm.net/conquest/util/1.0" dateFormat="yyyyMMdd" lang="german">
* <date dateFormat="yyyyMMdd">20050310<date>
* <jutil:dateDiff>
* </pre>
* </p>
* <p>
* If you just want to format a date, you can leave-out the attribute "diff".<br/>If you leave-out the attribute
* "dateFormat" the format "yyyyMMdd" will be used. The "lang"-attribute is optional.
* </p>
*
* @author <a href="carsten.schalm@juwimm.com">Carsten Schalm</a>
* Juwi|MacMillan Group Gmbh, Walsrode, Germany
* @version $$Id:UtilTransformer.java 4371 2008-05-28 09:37:42Z kulawik $
* @since ConQuest 1.66
*/
public class UtilTransformer extends AbstractTransformer implements Recyclable {
private static Logger log = Logger.getLogger(UtilTransformer.class);
// http://juwimm.net/conquest/util/1.0
public static final String NAME_SPACE = "jutil"; //$NON-NLS-1$
private String resultFormat = null;
private String resultLanguage = null;
private int diff = 0;
private String sourceFormat = null;
private String lastElement = null;
/* (non-Javadoc)
* @see org.apache.cocoon.sitemap.SitemapModelComponent#setup(
* org.apache.cocoon.environment.SourceResolver, java.util.Map, java.lang.String, org.apache.avalon.framework.parameters.Parameters)
*/
@SuppressWarnings("unchecked")
public void setup(SourceResolver resolver, Map objectModel, String src, Parameters par) throws ProcessingException, SAXException, IOException {
this.resultFormat = null;
this.resultLanguage = null;
this.diff = 0;
this.sourceFormat = null;
this.lastElement = null;
}
/*
* (non-Javadoc)
* @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
@Override
public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException {
this.lastElement = qName;
if (qName.startsWith(UtilTransformer.NAME_SPACE)) {
if (localName.equalsIgnoreCase("dateDiff")) { //$NON-NLS-1$
this.resultFormat = attrs.getValue("dateFormat"); //$NON-NLS-1$
if (log.isDebugEnabled()) log.debug("found resultFormat: " + this.resultFormat); //$NON-NLS-1$
this.resultLanguage = attrs.getValue("lang"); //$NON-NLS-1$
if (log.isDebugEnabled()) log.debug("found resultLanguage: " + this.resultLanguage); //$NON-NLS-1$
contentHandler.startElement(uri, localName, qName, attrs);
} else if (localName.equalsIgnoreCase("date")) { //$NON-NLS-1$
String d = null;
d = attrs.getValue("diff"); //$NON-NLS-1$
if (d != null) {
this.diff = Integer.parseInt(attrs.getValue("diff")); //$NON-NLS-1$
} else {
diff = 0;
}
this.sourceFormat = attrs.getValue("dateFormat"); //$NON-NLS-1$
AttributesImpl newAttr = new AttributesImpl();
newAttr.addAttribute("", "dateFormat", "dateFormat", "CDATA", this.resultFormat); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
contentHandler.startElement("", localName, localName, newAttr); //$NON-NLS-1$
} else if (localName.equalsIgnoreCase("currentDate")) { //$NON-NLS-1$
SimpleDateFormat sdf = new SimpleDateFormat(this.sourceFormat);
Date d = new Date();
String resultDate = this.transformDate(sdf.format(d));
contentHandler.characters(resultDate.toCharArray(), 0, resultDate.length());
}
} else {
contentHandler.startElement(uri, localName, qName, attrs);
}
}
/* (non-Javadoc)
* @see org.xml.sax.ContentHandler#characters(char[], int, int)
*/
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if (this.lastElement.equalsIgnoreCase(UtilTransformer.NAME_SPACE + ":date")) { //$NON-NLS-1$
String date = new String(ch, start, length);
String resultDate = this.transformDate(date);
this.lastElement = ""; //$NON-NLS-1$
contentHandler.characters(resultDate.toCharArray(), 0, resultDate.length());
} else {
this.lastElement = ""; //$NON-NLS-1$
contentHandler.characters(ch, start, length);
}
}
/* (non-Javadoc)
* @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
*/
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if (qName.equalsIgnoreCase(UtilTransformer.NAME_SPACE + ":date")) { //$NON-NLS-1$
// modify closing-tag of date
contentHandler.endElement("", localName, localName); //$NON-NLS-1$
} else if (!qName.equalsIgnoreCase(UtilTransformer.NAME_SPACE + ":currentDate")) { //$NON-NLS-1$
// kill event for closing currentDate, element has been substituted on opening
contentHandler.endElement(uri, localName, qName);
}
}
@Override
public void recycle() {
if (log.isDebugEnabled()) log.debug("begin recycle"); //$NON-NLS-1$
}
private String transformDate(String input) {
SimpleDateFormat sdf = new SimpleDateFormat(this.sourceFormat);
try {
Date sourceDate = sdf.parse(input, new ParsePosition(0));
Calendar cal = Calendar.getInstance();
if (sourceDate != null) {
cal.setTime(sourceDate);
sdf = null;
if (this.diff != 0) {
cal.add(Calendar.DAY_OF_YEAR, this.diff);
}
if (this.resultFormat != null && !"".equalsIgnoreCase(this.resultFormat)) { //$NON-NLS-1$
if (this.resultLanguage != null && !"".equalsIgnoreCase(this.resultLanguage)) { //$NON-NLS-1$
sdf = new SimpleDateFormat(this.resultFormat, new Locale(this.resultLanguage));
} else {
sdf = new SimpleDateFormat(this.resultFormat);
}
} else {
// return date in default-format
sdf = new SimpleDateFormat("yyyyMMdd"); //$NON-NLS-1$
}
return sdf.format(cal.getTime());
}
return input;
} catch (Exception e) {
log.error(e.getMessage());
return ""; //$NON-NLS-1$
}
}
}