From 32d17447a258188b2d534bcb0bf65a659ba7b7d0 Mon Sep 17 00:00:00 2001
From: mcentner <mcentner@8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4>
Date: Fri, 29 Aug 2008 12:11:34 +0000
Subject: Initial import.

git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@1 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4
---
 .../bku/utils/urldereferencer/URLDereferencer.java | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencer.java

(limited to 'utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencer.java')

diff --git a/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencer.java b/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencer.java
new file mode 100644
index 00000000..d747753f
--- /dev/null
+++ b/utils/src/main/java/at/gv/egiz/bku/utils/urldereferencer/URLDereferencer.java
@@ -0,0 +1,90 @@
+/*
+* 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.utils.urldereferencer;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Class used to dereference (external URLs).
+ * 
+ * @author wbauer
+ * 
+ */
+public class URLDereferencer {
+
+  private static Log log = LogFactory.getLog(URLDereferencer.class);
+
+  private static URLDereferencer instance = new URLDereferencer();
+
+  private Map<String, URLProtocolHandler> handlerMap = new HashMap<String, URLProtocolHandler>();
+
+  private URLDereferencer() {
+    registerHandlers();
+  }
+
+  /**
+   * 
+   * @param aUrl
+   *          must not be null
+   * @param aContext
+   * @throws MalformedURLException
+   *           if the protocol is not supported
+   */
+  public StreamData dereference(String aUrl, URLDereferencerContext aContext)
+      throws IOException {
+    log.debug("Looking for handler for URL: " + aUrl);
+    int i = aUrl.indexOf(":");
+    if (i == -1) {
+      throw new MalformedURLException("Invalid url: " + aUrl);
+    }
+    String protocol = aUrl.substring(0, i).toLowerCase().trim();
+    URLProtocolHandler handler = handlerMap.get(protocol);
+    if (handler == null) {
+      throw new MalformedURLException("No handler for protocol: " + protocol
+          + " found");
+    }
+    return handler.dereference(aUrl, aContext);
+  }
+
+  /**
+   * Registers a handler for a protocol.
+   * 
+   * @param aProtocol
+   * @param aHandler
+   *          may be set to null to disable this protocol
+   */
+  public void registerHandler(String aProtocol, URLProtocolHandler aHandler) {
+    handlerMap.put(aProtocol.toLowerCase(), aHandler);
+  }
+
+  public static URLDereferencer getInstance() {
+    return instance;
+  }
+
+  protected void registerHandlers() {
+    URLProtocolHandler handler = new HTTPURLProtocolHandlerImpl();
+    for (String proto : HTTPURLProtocolHandlerImpl.PROTOCOLS) {
+      handlerMap.put(proto, handler);
+    }
+  }
+}
\ No newline at end of file
-- 
cgit v1.2.3