DPML Notify

[mcconnell AT dpml.net]

Author: mcconnell AT dpml.net
Date: Mon Mar 14 14:47:50 2005
New Revision: 2071

Added:
   
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/PartNotFoundException.java
Modified:
   
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/Home.java
   
development/laboratory/plus/core/src/main/net/dpml/metro/home/impl/TransitHome.java
Log:


Modified: 
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/Home.java
==============================================================================
--- 
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/Home.java 
      (original)
+++ 
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/Home.java 
      Mon Mar 14 14:47:50 2005
@@ -21,6 +21,7 @@
 import java.net.URI;
 import java.io.IOException;
 
+import net.dpml.metro.part.Part;
 import net.dpml.metro.part.PartHandler;
 
 /**
@@ -32,5 +33,6 @@
  */
 public interface Home
 {
+    Part loadPart( URI uri ) throws HandlerNotFoundException, IOException;
     PartHandler resolvePartHandler( URI uri ) throws 
HandlerNotFoundException, IOException;
 }

Added: 
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/PartNotFoundException.java
==============================================================================
--- (empty file)
+++ 
development/laboratory/plus/api/kernel/src/main/net/dpml/metro/home/PartNotFoundException.java
      Mon Mar 14 14:47:50 2005
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2005 Stephen J. McConnell
+ *
+ * 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 net.dpml.metro.home;
+
+import java.net.URL;
+
+/**
+ * Exception thrown when an attempt is made to reference an unknown part.
+ *
+ * @author <a href="mailto:dev-dpml AT lists.ibiblio.org";>The Digital Product 
Meta Library</a>
+ * @version $Revision: 1.2 $ $Date: 2004/03/17 10:30:09 $
+ */
+public class PartNotFoundException extends HomeException 
+{
+    private URL m_url;
+
+    public PartNotFoundException( URL url )
+    {
+        this( url, null );
+    }
+
+    public PartNotFoundException( URL url, Exception cause )
+    {
+        super( url.toString(), cause );
+        m_url = url;
+    }
+
+    public URL getURL()
+    {
+        return m_url;
+    }
+
+}
+

Modified: 
development/laboratory/plus/core/src/main/net/dpml/metro/home/impl/TransitHome.java
==============================================================================
--- 
development/laboratory/plus/core/src/main/net/dpml/metro/home/impl/TransitHome.java
 (original)
+++ 
development/laboratory/plus/core/src/main/net/dpml/metro/home/impl/TransitHome.java
 Mon Mar 14 14:47:50 2005
@@ -28,6 +28,7 @@
 import net.dpml.metro.home.HomeRuntimeException;
 import net.dpml.metro.part.PartHandler;
 import net.dpml.metro.part.Handler;
+import net.dpml.metro.part.Part;
 
 import net.dpml.transit.repository.StandardLoader;
 import net.dpml.transit.TransitException;
@@ -59,6 +60,47 @@
         }
     }
 
+    public Part loadPart( URI url ) throws PartNotFoundException, 
HandlerNotFoundException, IOException
+    {
+        InputStream input = url.openStream();
+        if( null == input )
+        {
+            throw new PartNotFoundException( uri );
+        }
+        ObjectInputStream stream = new ObjectInputStream( input );
+        try
+        {
+            PartHolder holder = (PartHolder) stream.readObject();
+            URI uri = holder.getPartHandlerURI();
+            PartHandler handler = resolvePartHandler( uri );
+            return handler.loadPart( uri, holder.getByteArray() );
+        }
+        catch( IOException e )
+        {
+            final String error = 
+              "IO error while attempting to load the part ["
+              + url
+              + "].";
+            throw new HandlerNotFoundException( error, e );
+        }
+        catch( HandlerNotFoundException e )
+        {
+            final String error = 
+              "Could not locate the handler for the part ["
+              + url
+              + "].";
+            throw new HandlerNotFoundException( error, e );
+        }
+        catch( Throwable e )
+        {
+            final String error = 
+              "Internal error while attempting to load a part form the url ["
+              + url
+              + "].";
+            throw new HomeRuntimeException( error, e );
+        }        
+    }
+
     public PartHandler resolvePartHandler( URI uri ) throws 
HandlerNotFoundException, IOException
     {
         Handler handler = resolveHandler( uri );