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TSL2 Framework Html5 Extensions (WebServer, Html5Presentation, RuleCover, BeanConfigurator, LogicTable-Sheet, Expression-Descriptors for Actions, Rules, URLs, Queries)

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package de.tsl2.nano.h5;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;


import de.tsl2.nano.bean.def.Bean;
import de.tsl2.nano.core.ENV;
import de.tsl2.nano.core.ManagedException;

/**
 * exports any objects to ics format. example: new ICSCalendarExport("myCal").addAll(myObjects, MapUtil.asMap(FIELD.SUMMARY, "myTitle", ...)).write();
 * @author ts
 */
public class ICSCalendarExport {
	StringBuilder buf;
	String name;
	enum REPEAT {DAILY, WEEKLY, MONTHLY, YEARLY}
	enum FIELD {BEGIN, VERSION, PROID, METHOD, UID, LOCATION, SUMMARY, DESCRIPTION, CATEGORIES, CLASS, TZID, RRULE, DTSTART, DTEND, DTSTAMP, END}
	
	SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'");
	private REPEAT repeat;
	
	public ICSCalendarExport(String name, REPEAT repeat) {
		this.name = name;
		this.repeat = repeat;
		buf = new StringBuilder(getStartBlock());
	}
	protected String getStartBlock() {
		return FIELD.BEGIN + ":VCALENDAR\n" + FIELD.VERSION + ":2.0\n" + FIELD.PROID + ":https://sourceforge.net/projects/tsl2nano/\n" + FIELD.METHOD + ":PUBLISH\n";
	}
	protected String getEndBlock() {
		return FIELD.END + ":VCALENDAR\n";
	}
	public ICSCalendarExport addAll(Collection objects, Map attributeMapping) {
		assert objects != null && attributeMapping != null && attributeMapping.size() > 2 : "at least SUMMARY, DTSTART, DTEND must be mapped!"; 
		for (Object obj: objects) {
			buf.append(toICS(obj, attributeMapping));
		}
		return this;
	}
	protected String toICS(Object obj, Map attributeMapping) {
		StringBuilder ics = new StringBuilder();
		Bean