[NUTCH-140] Add alias capability in parse-plugins.xml file that allows mimeType->extensionId mapping

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.8
• Component/s: fetcher

Environment

Power Mac OS X 10.4, Dual Processor G5 2.0 Ghz, 1.5 GB RAM, although bug is independent of environment

• Assignee: Chris A. Mattmann
• Reporter: Chris A. Mattmann
• Due: 19/Dec/05
• Created: 14/Dec/05 13:10
• Updated: 21/Feb/06 19:01
• Resolved: 21/Feb/06 19:01

Description

Jerome and I have been talking about an idea to address the current issue raised by Stefan G. about having a mapping of mimeType->list of pluginIds rather than mimeType->list of extensionIds in the parse-plugins.xml file. We've come up with the following proposed update that would seemingly fix this problem.

We propose to have the concept of "aliases" in the parse-plugins.xml file, defined at the end of the file, something lie:

<parse-plugins>
....

<mimeType name="text/html">
<plugin id="parse-html"/>
</mimeType>

.....

<aliases>
<alias name="parse-html"
extension-point="org.apache.nutch.parse.html.HtmlParser"/>

....
<alias name="parse-html2" extension-point="my.other.html.Parser"/>

....
</aliases>
</parse-plugins>

What do you guys think? This approach would be flexible enough to allow the mapping of extensionIds to mimeTypes, but without impacting the current "pluginId" concept.

Comments welcome.