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An iCalendar parser/writer library written in Java.
There is a newer version: 0.6.8
// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package biweekly.util.com.google.ical.values;

import java.text.ParseException;
import java.util.Map;
import java.util.TimeZone;

/**
 * a list of dates, as from an RDATE or EXDATE ical property.
 *
 * See RFC 2445 sections 4.8.5.1 and 4.8.5.3.
 *
 * @author [email protected] (Mike Samuel)
 */
public class RDateList extends AbstractIcalObject {

  private TimeZone tzid;
  private DateValue[] datesUtc;
  private IcalValueType valueType;

  public RDateList(String icalString, TimeZone tzid) throws ParseException {
    setTzid(tzid);
    parse(icalString, RRuleSchema.instance());
  }

  public RDateList(TimeZone tzid) {
    setTzid(tzid);
    setName("RDATE");
    datesUtc = new DateValue[0];
  }

  public TimeZone getTzid() { return this.tzid; }
  public void setTzid(TimeZone tzid) {
    assert null != tzid;
    this.tzid = tzid;
  }

  public DateValue[] getDatesUtc() {
    return null != this.datesUtc ? this.datesUtc.clone() : null;
  }
  public void setDatesUtc(DateValue[] datesUtc) {
    this.datesUtc = datesUtc.clone();
    if (datesUtc.length > 0) {
      setValueType((datesUtc[0] instanceof TimeValue)
                   ? IcalValueType.DATE_TIME
                   : IcalValueType.DATE);
    }
  }

  /**
   * the type of the values contained by this list as reported by the ical
   * "VALUE" parameter, typically DATE or DATE-TIME.
   */
  public IcalValueType getValueType() {
    return valueType;
  }

  public void setValueType(IcalValueType valueType) {
    this.valueType = valueType;
  }

  /** returns a String containing ical content lines. */
  public String toIcal() {
    StringBuilder buf = new StringBuilder();
    buf.append(this.getName().toUpperCase());
    buf.append(";TZID=\"").append(tzid.getID()).append('"');
    buf.append(";VALUE=").append(valueType.toIcal());
    if (hasExtParams()) {
      for (Map.Entry param : getExtParams().entrySet()) {
        String k = param.getKey(),
               v = param.getValue();
        if (ICAL_SPECIALS.matcher(v).find()) {
          v = "\"" + v + "\"";
        }
        buf.append(';').append(k).append('=').append(v);
      }
    }
    buf.append(':');
    for (int i = 0; i < datesUtc.length; ++i) {
      if (0 != i) { buf.append(','); }
      DateValue v = datesUtc[i];
      buf.append(v);
      if (v instanceof TimeValue) { buf.append('Z'); }
    }
    return buf.toString();
  }

}