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PORandom-access data object in J2ME
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copied!<p>I'm planning to develop a small J2ME utility for viewing local public transport schedules using a mobile phone. The data part for those is mostly a big bunch of numbers representing the times when the buses arrive or leave.</p> <p>What I'm trying to figure out is what is the best way to store that data. The representation needs to</p> <ol> <li>be considerably small (because of persistent storage limitations of a mobile phone)</li> <li><strike>fit into a single file (for the ease of updating the schedule database afterwards over HTTP)</strike> fit into a constant number of files, i.e. (<code>routes.dat</code>, <code>times.dat</code>, ..., <code>agencies.dat</code>), and <strong>not</strong> (<code>schedule_111.dat</code>, <code>schedule_112.dat</code>, ...)</li> <li>have a random access ability (unserializing the whole data object into memory would be just too much for a mobile phone :))</li> <li>if there's some library for accessing that data format, a Java implementation should be present</li> </ol> <p>In other words, if you had to squeeze a big part of <a href="http://code.google.com/transit/spec/transit_feed_specification.html" rel="nofollow noreferrer" title="Google Transit Feed Specification">GTFS</a>-like data into a mobile device, how would you do that?</p> <p><a href="http://code.google.com/apis/protocolbuffers/" rel="nofollow noreferrer" title="Google Protocol Buffers">Google Protocol Buffers</a> seemed like a good candidate for defining data but it didn't have random access.</p> <p>What would you suggest?</p>

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