fix(data): make MetadataHelper throw runtime exception

Due to the changed behaviour of the handlers throwing HandlerExceptions
only, we need to throw the runtime exception InternalOAIException.

This also makes more sense, as the exceptions does not happen because of
a malicious user request (which is what we have been using the explicit
exceptions for).

Author: poikilotherm

xoai-data-provider/src/main/java/io/gdcc/xoai/dataprovider/handlers/helpers/MetadataHelper.java

@@ -1,13 +1,12 @@
 package io.gdcc.xoai.dataprovider.handlers.helpers;
 
-import io.gdcc.xoai.exceptions.OAIException;
+import io.gdcc.xoai.dataprovider.exceptions.InternalOAIException;
 import io.gdcc.xoai.dataprovider.model.Context;
 import io.gdcc.xoai.dataprovider.model.MetadataFormat;
 import io.gdcc.xoai.model.oaipmh.results.record.Metadata;
 import io.gdcc.xoai.xml.EchoElement;
 import io.gdcc.xoai.xml.XSLPipeline;
 import io.gdcc.xoai.xml.XmlWriter;
-import io.gdcc.xoai.xmlio.exceptions.XmlWriteException;
 
 import javax.xml.stream.XMLStreamException;
 import javax.xml.transform.TransformerException;
@@ -16,7 +15,7 @@
 import java.io.IOException;
 
 public class MetadataHelper {
-    public static Metadata process(Metadata metadata, MetadataFormat format, Context context) throws OAIException {
+    public static Metadata process(Metadata metadata, MetadataFormat format, Context context) {
         try (
             ByteArrayOutputStream outStream = new ByteArrayOutputStream();
             XmlWriter writer = new XmlWriter(outStream);
@@ -33,7 +32,7 @@ public static Metadata process(Metadata metadata, MetadataFormat format, Context
 
             return new Metadata(element);
         } catch (XMLStreamException | TransformerException | IOException e) {
-            throw new OAIException(e);
+            throw new InternalOAIException(e);
         }
     }
 }