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GEO-label-java

A Java implementation of the GEO label server API.

Build Status

Modules

This project consists of a service implementation generating GEO label SVG representations from supplied metadata, a client API to access such a service as well as a client JSF component to directly render GEO labels into JSF 1/2 and JSP based webpages.

###Client

Client API to access a GEO label service. Uses a builder pattern to allow various combinations of metadata and feedback document inputs supporting streams, URL references and XML Documents.

InputStream geoLabel = GeoLabelClientV1.createGeoLabelRequest()
							.setMetadataDocument(metadataStream)
							.setFeedbackDocument(feedbackStream)
							.getSVG();

###JSF

Simple JSF component rendering GEO labels from actual feedback/metadata documents and/or URL references. Supports asynchronous loading using Partial Page Rendering.

<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:glb="http://www.geolabel.net">
	<h:head/>
	<h:body>
		<glb:geolabel metadataUrl="#{metadataUrl}" feedbackUrl="#{feedbackUrl}"	async="true" size="100" />
	</h:body>
</html>		

For more details see jsf/Readme.md

###Server

An instance is currently deployed at http://geoviqua.dev.52north.org/glbservice

For more details see server/Readme.md

###Commons

Resources required by server and client modules.

For more details see commons/Readme.md

Transformation Rules

The GEO label basically uses a set of XPath expressions to determine if the required information is available so that a facet can be marked as available. For interoperability reasons (using the same configuration file as the PHP implementation, and PHP only supports XPath 1.0) this Java implementation uses XPath 1.0.

The transformation rules are be downloaded on startup from http://geoviqua.github.io/geolabel/ and the service has a local fallback if the online file cannot be found.

For future work, using XPath 2.0 using Saxon would be an advantage because wildcards can be used for namespaces. A commit that still contains a Saxon-based implementation is https://github.com/52North/GEO-label-java/commit/def538a4966201970a397963328664c70b2de788

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A Java implementation of the GEO label, including client and server module and a standalone generator for GEO labels.

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