GitHub - chungonn/google-rfc-2445: A java implementation of RFC 2445 (ical) recurrence rules

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A java implementation of RFC 2445 (ical) recurrence rules

Apache-2.0 license

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<!DOCTYPE PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Read Me</title>

<link type="text/css" rel="stylesheet"
 href="http://google-code-prettify.googlecode.com/svn/trunk/src/prettify.css" />
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<h2>Online Documentation</h2>
<p>The javadoc is available <a
 href="http://google-rfc-2445.googlecode.com/svn/trunk/snapshot/docs/index.html"
>online</a>.</p>

<h2>Downloading</h2>
<p>The source is available from subversion.  See <a
 href="http://code.google.com/p/google-rfc-2445/source">the project page</a> for
instructions on how to download the source from subversion.</p>


<h2>Building</h2>

<p>Requires <a href="http://ant.apache.org/">ant</a> to build with
<a href="http://www.junit.org/">junit</a> for testing, and optionally
<a href="http://joda-time.sourceforge.net/">joda-time</a> installed.</p>

<p>Once you've got <code>ant</code>
<a href="http://ant.apache.org/manual/index.html">set up and installed</a>,
run <code>ant default</code> to build the jars and documentation, and then
read the documentation in the <code>docs</code> directory.  You can use the jar
at <code>jars/rfc2445.jar</code> in your program.</p>

<p>To build without joda-time, run <code>ant rfc2445-no-joda</code> and it will
produce a version of the jar without the joda-time compatibility classes.</p>


<h2>Using</h2>

<p>Using the API is pretty easy.   Pass in some ical and you get back
a date iterable, which can be used in a for-each loop thusly:</p>

<pre class=prettyprint>
// A compatibility layer for joda-time
import com.google.ical.compat.jodatime.LocalDateIteratorFactory;
// A Joda time class that represents a day regardless of timezone
import org.joda.time.LocalDate;

public class ThirteenFridaysTheThirteenth {

  /** print the first 13 Friday the 13ths in the 3rd millenium AD. */
  public static void main(String[] args) throws java.text.ParseException {
    LocalDate start = new LocalDate(2001, 4, 13);

    // Every friday the thirteenth.
    String ical = "RRULE:FREQ=MONTHLY"
                  + ";BYDAY=FR"  // every Friday
                  + ";BYMONTHDAY=13"  // that occurs on the 13th of the month
                  + ";COUNT=13";  // stop after 13 occurences

    // Print out each date in the series.
    for (LocalDate date :
         LocalDateIteratorFactory.createLocalDateIterable(ical, start, true)) {
      System.out.println(date);
    }
  }

}
</pre>
<p>See <a href="rfc2445.html#4.3.10">RFC 2445</a> for the recurrence rule
syntax and what it means, and the examples <a href="rfc2445.html#4.8.5.4"
>later</a> in the same document.</p>

<p>If you use <code>java.util.Date</code> and <code>java.util.Calendar</code> in
your application instead of Joda-Time, you can use the
<code>com.google.ical.compat.javautil</code> package instead to provide
Date objects.</p>


<h2>Running tests</h2>

<p>If you make source changes, you can run <code>ant runtests</code> to run
build and run the tests.</p>

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