svn commit: r574371 - /xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java

[mu...@apache.org]

Author: mullan
Date: Mon Sep 10 14:02:20 2007
New Revision: 574371

URL: http://svn.apache.org/viewvc?rev=574371&view=rev
Log:
Add Stax-based implementation of a URIDereferencer.

Added:
    xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java

Added: xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java
URL: http://svn.apache.org/viewvc/xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java?rev=574371&view=auto
==============================================================================
--- xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java (added)
+++ xml/security/branches/stax_jsr105/src/com/r_bg/stax/StaxURIDereferencer.java Mon Sep 10 14:02:20 2007
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2007 The Apache Software Foundation.
+ *
+ *  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 com.r_bg.stax;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URLConnection;
+import java.net.URL;
+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 javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamReader;
+
+/**
+ * A STaX based implementation of URIDereferencer.
+ *
+ * Currently, only http and file URIs are supported.
+ *
+ * @author Sean Mullan
+ */
+public class StaxURIDereferencer implements URIDereferencer {
+
+    static final StaxURIDereferencer INSTANCE = new StaxURIDereferencer();
+
+    public Data dereference(URIReference uriReference, XMLCryptoContext context)
+	throws URIReferenceException {
+	if (uriReference == null || context == null) {
+	    throw new NullPointerException();
+	}
+	String uri = uriReference.getURI();
+	String baseURI = context.getBaseURI();
+	if (uri.startsWith("http:") || 
+	    (baseURI != null && baseURI.startsWith("http:"))) {
+	    try {
+                URLConnection uc = null;
+                if (baseURI != null) {
+                    uc = new URL(new URL(baseURI), uri).openConnection();
+                } else { 
+                    uc = new URL(uri).openConnection();
+                }   
+                return new OctetStreamData(uc.getInputStream());
+	    } catch (IOException ioe) {
+		throw new URIReferenceException(ioe);
+	    }
+        } else if (uri.startsWith("file:") ||
+            (baseURI != null && baseURI.startsWith("file:"))) {
+            try {
+                URI fileURI = null;
+                if (baseURI != null) {
+                    fileURI = new URI(baseURI).resolve(uri);
+                } else {
+                    fileURI = new URI(uri);
+                }
+                FileInputStream fs = new FileInputStream(new File(fileURI));
+                XMLInputFactory xif = XMLInputFactory.newInstance();
+                XMLStreamReader re = xif.createXMLStreamReader(fs);
+		return new StaxData(re);
+	    } catch (Exception e) {
+		throw new URIReferenceException(e);
+	    }
+	}    
+
+	throw new UnsupportedOperationException();
+    }
+}