1 files changed, 112 insertions, 0 deletions
diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/LocRefDereferencer.java b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/LocRefDereferencer.java
new file mode 100644
index 00000000..f5394157
--- /dev/null
+++ b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/LocRefDereferencer.java
@@ -0,0 +1,112 @@
+/*
+* 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 <code>LocRef</code>
+ * references.
+ * 
+ * @author mcentner
+ */
+public class LocRefDereferencer implements URIDereferencer {
+
+  /**
+   * Logging facility.
+   */
+  private static Log log = LogFactory.getLog(LocRefDereferencer.class);
+
+  /**
+   * The <code>LocRef</code>-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
+   * <code>dereferencerContext</code> and <code>locRef</code> reference.
+   * 
+   * @param dereferencerContext
+   *          the context to be used for dereferencing
+   * @param locRef
+   *          the <code>LocRef</code>-reference (must be an absolute URI)
+   * 
+   * @throws URISyntaxException
+   *           if <code>LocRef</code> 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());
+  }
+
+}