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From nor...@apache.org
Subject svn commit: r940679 - /james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java
Date Tue, 04 May 2010 00:07:47 GMT
Author: norman
Date: Tue May  4 00:07:47 2010
New Revision: 940679

URL: http://svn.apache.org/viewvc?rev=940679&view=rev
Log:
Add abstract implementation of ProtocolHandlerChain for simplify implementations

Added:
    james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java

Added: james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java
URL: http://svn.apache.org/viewvc/james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java?rev=940679&view=auto
==============================================================================
--- james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java
(added)
+++ james/protocols/trunk/api/src/main/java/org/apache/james/protocols/api/AbstractProtocolHandlerChain.java
Tue May  4 00:07:47 2010
@@ -0,0 +1,77 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you 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 org.apache.james.protocols.api;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Abstract base class for {@link ProtocolHandlerChain} implementations
+ * 
+ *
+ */
+public abstract class AbstractProtocolHandlerChain implements ProtocolHandlerChain{
+
+	/**
+	 * Return a List of all Handlers
+	 * 
+	 * @return handlerList
+	 */
+	protected abstract List<Object> getHandlers();
+	
+	/*
+	 * (non-Javadoc)
+	 * @see org.apache.james.protocols.api.ProtocolHandlerChain#getHandlers(java.lang.Class)
+	 */
+    @SuppressWarnings("unchecked")
+    public <T> LinkedList<T> getHandlers(Class<T> type) {
+        LinkedList<T> result = new LinkedList<T>();
+        List<Object> handlers = getHandlers();
+        for (Iterator<?> i = handlers.iterator(); i.hasNext(); ) {
+            Object handler = i.next();
+            if (type.isInstance(handler)) {
+                result.add((T)handler);
+            }
+        }
+        return result;
+    }
+    
+    /**
+     * ExtensibleHandler wiring. This should get called after the class was constructed
+     * and every stuff was set
+     * 
+     * @throws WiringException 
+     */
+    public final void wireExtensibleHandlers() throws WiringException {
+        List<Object> handlers = getHandlers();
+        for (Iterator<?> h = handlers.iterator(); h.hasNext(); ) {
+            Object handler = h.next();
+            if (handler instanceof ExtensibleHandler) {
+                final ExtensibleHandler extensibleHandler = (ExtensibleHandler) handler;
+                final List<Class<?>> markerInterfaces = extensibleHandler.getMarkerInterfaces();
+                for (int i= 0;i < markerInterfaces.size(); i++) {
+                    final Class<?> markerInterface = markerInterfaces.get(i);
+                    final List<?> extensions = getHandlers(markerInterface);
+                    extensibleHandler.wireExtensions(markerInterface,extensions);
+                }
+            }
+        }
+    }
+}



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