/*
* Copyright 2008 Federal Chancellery Austria and
* Graz University of Technology
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package at.gv.egiz.bku.slcommands.impl.xsect;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import javax.xml.crypto.Data;
import javax.xml.crypto.OctetStreamData;
import javax.xml.crypto.URIDereferencer;
import javax.xml.crypto.URIReference;
import javax.xml.crypto.URIReferenceException;
import javax.xml.crypto.XMLCryptoContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import at.gv.egiz.bku.utils.urldereferencer.StreamData;
import at.gv.egiz.bku.utils.urldereferencer.URLDereferencer;
import at.gv.egiz.bku.utils.urldereferencer.URLDereferencerContext;
/**
* An URIDereferencer implementation that dereferences LocRef
* references.
*
* @author mcentner
*/
public class LocRefDereferencer implements URIDereferencer {
/**
* Logging facility.
*/
private static Log log = LogFactory.getLog(LocRefDereferencer.class);
/**
* The LocRef
-reference to be dereferenced by
* {@link #dereference(URIReference, XMLCryptoContext)}.
*/
protected String locRef;
/**
* The context to be used for dereferencing.
*/
protected URLDereferencerContext dereferencerContext;
/**
* Creates a new instance of this LocRefDereferencer with the given
* dereferencerContext
and locRef
reference.
*
* @param dereferencerContext
* the context to be used for dereferencing
* @param locRef
* the LocRef
-reference (must be an absolute URI)
*
* @throws URISyntaxException
* if LocRef
is not an absolute URI
*/
public LocRefDereferencer(URLDereferencerContext dereferencerContext,
String locRef) throws URISyntaxException {
this.dereferencerContext = dereferencerContext;
URI locRefUri = new URI(locRef);
if (locRefUri.isAbsolute()) {
this.locRef = locRef;
} else {
throw new IllegalArgumentException(
"Parameter 'locRef' must be an absolut URI.");
}
}
/*
* (non-Javadoc)
*
* @see
* javax.xml.crypto.URIDereferencer#dereference(javax.xml.crypto.URIReference,
* javax.xml.crypto.XMLCryptoContext)
*/
@Override
public Data dereference(URIReference uriReference, XMLCryptoContext context)
throws URIReferenceException {
URLDereferencer dereferencer = URLDereferencer.getInstance();
StreamData streamData;
try {
streamData = dereferencer.dereference(locRef, dereferencerContext);
} catch (IOException e) {
log.info("Failed to dereference URI'" + locRef + "'. " + e.getMessage(),
e);
throw new URIReferenceException("Failed to dereference URI '" + locRef
+ "'. " + e.getMessage(), e);
}
return new OctetStreamData(streamData.getStream(), locRef, streamData
.getContentType());
}
}