[jboss-svn-commits] JBoss Common SVN: r3446 - declarchive/trunk/api/src/main/java/org/jboss/declarchive/api/jar.

[jboss-svn-commits at lists.jboss.org]

Author: ALRubinger
Date: 2009-08-13 01:41:00 -0400 (Thu, 13 Aug 2009)
New Revision: 3446

Added:
   declarchive/trunk/api/src/main/java/org/jboss/declarchive/api/jar/ArchiveFactory.java
Log:
[TMPARCH-6] Start an internal factory for archive impls

Added: declarchive/trunk/api/src/main/java/org/jboss/declarchive/api/jar/ArchiveFactory.java
===================================================================
--- declarchive/trunk/api/src/main/java/org/jboss/declarchive/api/jar/ArchiveFactory.java	                        (rev 0)
+++ declarchive/trunk/api/src/main/java/org/jboss/declarchive/api/jar/ArchiveFactory.java	2009-08-13 05:41:00 UTC (rev 3446)
@@ -0,0 +1,114 @@
+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2009, Red Hat Middleware LLC, and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * 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 org.jboss.declarchive.api.jar;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.logging.Logger;
+
+import org.jboss.declarchive.api.Archive;
+
+/**
+ * ArchiveFactory
+ * 
+ * Factory to create {@link Archive} instances, backed
+ * by some implementation of a storage archive (ie. File or in-memory). 
+ * This removes the API dependency upon internals for the 
+ * client view and additionally acts as a convenience mechanism.
+ *
+ * @author <a href="mailto:andrew.rubinger at jboss.org">ALR</a>
+ * @version $Revision: $
+ */
+class ArchiveFactory
+{
+
+   //-------------------------------------------------------------------------------------||
+   // Class Members ----------------------------------------------------------------------||
+   //-------------------------------------------------------------------------------------||
+
+   /**
+    * Logger
+    */
+   private static final Logger log = Logger.getLogger(ArchiveFactory.class.getName());
+
+   //-------------------------------------------------------------------------------------||
+   // Constructor ------------------------------------------------------------------------||
+   //-------------------------------------------------------------------------------------||
+
+   /**
+    * Internal Constructor to prohibit external
+    * instantiation
+    */
+   private ArchiveFactory()
+   {
+   }
+
+   //-------------------------------------------------------------------------------------||
+   // Functional Methods -----------------------------------------------------------------||
+   //-------------------------------------------------------------------------------------||
+
+   /**
+    * Creates a new {@link Archive}
+    * 
+    * @param name
+    * @throws IllegalArgumentException If the name is not specified
+    */
+   static <T extends Archive<T>> T createArchive(final Constructor<T> constructor, final T delegate)
+         throws IllegalArgumentException
+   {
+      // Precondition check
+      if (delegate == null)
+      {
+         throw new IllegalArgumentException("delegate must be specified");
+      }
+
+      final Class<T> actualClass = constructor.getDeclaringClass();
+
+      // Create new instance
+      final Object obj;
+      try
+      {
+         obj = constructor.newInstance(delegate);
+      }
+      catch (final InstantiationException e)
+      {
+         throw new RuntimeException("Error in creating new " + actualClass.getName(), e);
+      }
+      catch (final IllegalAccessException e)
+      {
+         throw new RuntimeException("Error in creating new " + actualClass.getName(), e);
+      }
+      catch (final InvocationTargetException e)
+      {
+         throw new RuntimeException("Error in creating new " + actualClass.getName(), e);
+      }
+
+      // Cast 
+      final T archive;
+      try
+      {
+         archive = constructor.getDeclaringClass().cast(obj);
+      }
+      catch (final ClassCastException cce)
+      {
+         throw new RuntimeException("New instance should be of type " + actualClass.getName(), cce);
+      }
+
+      // Return
+      return archive;
+   }
+}