package com.googlecode.wicketwebbeans.datepicker;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.wicket.Component;
import org.apache.wicket.Request;
import org.apache.wicket.RequestCycle;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.IAjaxCallDecorator;
import org.apache.wicket.ajax.calldecorator.AjaxCallDecorator;
import org.apache.wicket.util.string.AppendingStringBuffer;
import org.apache.wicket.util.string.Strings;
/**
* AJAX based {@link ISelectCallback}, which executes an AJAX event when the
* user selects something in the date picker.
*
* @author Frank Bille Jensen
*/
public abstract class AjaxSelectCallback implements ISelectCallback
{
private static final Pattern ajaxScriptPattern =
Pattern.compile("^var wcall=wicketAjaxGet\\('([^']+)'.*$");
private static final SimpleDateFormat dateParamFormat =
new SimpleDateFormat("yyyy-M-d-H-m");
private abstract class SelectCallbackBehavior extends AbstractDefaultAjaxBehavior
{
@Override
public CharSequence getCallbackScript()
{
return super.getCallbackScript();
}
}
private SelectCallbackBehavior eventBehavior;
public final void bind(Component component)
{
eventBehavior = new SelectCallbackBehavior()
{
private static final long serialVersionUID = 1L;
protected void respond(AjaxRequestTarget target)
{
Request request = RequestCycle.get().getRequest();
String dateParam = request.getParameter("dateParam");
Date date = null;
try
{
date = dateParamFormat.parse(dateParam);
}
catch (ParseException e)
{
throw new WicketRuntimeException(e);
}
onEvent(target, date);
}
@Override
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return new AjaxCallDecorator()
{
private static final long serialVersionUID = 1L;
@Override
public CharSequence decorateScript(CharSequence script)
{
AppendingStringBuffer b = new AppendingStringBuffer();
Matcher mat = ajaxScriptPattern.matcher(script);
if (mat.matches())
{
String url = mat.group(1);
String newUrl = url + "&dateParam='+dateParam+'";
b.append(Strings.replaceAll(script, url, newUrl));
}
else
{
throw new WicketRuntimeException("Internal error in Wicket");
}
return b;
}
};
}
};
component.add(eventBehavior);
}
public final CharSequence handleCallback()
{
return eventBehavior.getCallbackScript();
}
protected abstract void onEvent(AjaxRequestTarget target, Date date);
}