Resource Reader

Description

A Resource Reader retrieves resources associated with Metacards via URIs. Each Resource Reader must know how to interpret the resource's URI and how to interact with the data store to retrieve the resource.

There can be multiple Resource Readers in a Catalog instance. The Catalog Framework selects the appropriate Resource Reader based on the scheme of the resource's URI. 

In order to make a Resource Reader available to the Catalog Framework it should be exported to the OSGi Service Registry as a ddf.catalog.resource.ResourceReader. 

Examples

Catalog includes the following Resource Readers out of the box:

• URL Resource Reader

Additional Information

• URI on Wikipedia (http://en.wikipedia.org/wiki/Uniform_resource_identifier).
• URI Javadoc (http://docs.oracle.com/javase/6/docs/api/java/net/URI.html).
• See Working with Resources and Developing a Resource Reader in the Developing Catalog Components section.