Compile the XSLT stylesheet in the constructor

git-svn-id: https://develop.sub.uni-goettingen.de/repos/textgrid/trunk/services/aggregator@13482 7c539038-3410-0410-b1ec-0f2a7bf1c452

src/main/java/info/textgrid/services/aggregator/EPUB.java

@@ -39,6 +39,20 @@ public class EPUB {
 
 	final Logger logger = Logger.getLogger("info.textgrid.services.aggregator");
 
+	private XsltExecutable teiToEpub;
+
+	private final Processor xsltProcessor;
+
+	public EPUB() {
+		xsltProcessor = new Processor(false);
+		final XsltCompiler xsltCompiler = xsltProcessor.newXsltCompiler();
+		try {
+			teiToEpub = xsltCompiler.compile(new StreamSource("/usr/share/xml/tei/stylesheet/epub/tei-to-epub.xsl"));
+		} catch (final SaxonApiException e) {
+			throw new IllegalStateException(e);
+		}
+	}
+
 	@GET
 	@Path(value="/{object}")
 	@Produces(value="application/epub+zip")
@@ -70,11 +84,10 @@ public Response get(@PathParam("object") final URI uri) {
 			corpusSerializer.write(corpusOutput);
 			corpusOutput.close();
 
-			final Processor processor = new Processor(false);
-			final XsltCompiler xsltCompiler = processor.newXsltCompiler();
-			final XsltExecutable teiToEpub = xsltCompiler.compile(new StreamSource("/usr/share/xml/tei/stylesheet/epub/tei-to-epub.xsl"));
+			// Now, run the EPUB stylesheet
+			// TODO cache the saxon stuff
 			final XsltTransformer transformer = teiToEpub.load();
-			transformer.setDestination(processor.newSerializer(new File(workingDir, "output.xml")));
+			transformer.setDestination(xsltProcessor.newSerializer(new File(workingDir, "output.xml")));
 			transformer.setSource(new StreamSource(corpus));
 			transformer.transform();