mcconnell 2003/01/06 22:26:37
Modified: merlin/src/java/org/apache/avalon/merlin/kernel
DefaultKernel.java
merlin/src/test/config block.xml
Added: merlin external.xml
Log:
Added support for optional loading of an external block implementation
configuration file.
Revision Changes Path
1.1 avalon-sandbox/merlin/external.xml
Index: external.xml
===================================================================
<!--
Demonstration of an external block implementation configuration file.
To use an external file, the packaged block.xml "implementation"
element must contain a file name of the external source under an
attibute named "src".
-->
<implementation>
<container name="test">
<appliance name="standard"
class="org.apache.avalon.playground.StandardComponent" activation="startup">
<context class="org.apache.avalon.playground.StandardContextImp"/>
</appliance>
</container>
</implementation>
1.20 +44 -3
avalon-sandbox/merlin/src/java/org/apache/avalon/merlin/kernel/DefaultKernel.java
Index: DefaultKernel.java
===================================================================
RCS file:
/home/cvs/avalon-sandbox/merlin/src/java/org/apache/avalon/merlin/kernel/DefaultKernel.java,v
retrieving revision 1.19
retrieving revision 1.20
diff -u -r1.19 -r1.20
--- DefaultKernel.java 6 Jan 2003 01:05:53 -0000 1.19
+++ DefaultKernel.java 7 Jan 2003 06:26:37 -0000 1.20
@@ -646,7 +646,8 @@
//
String partition = name + Container.PATH_SEPERATOR;
- Configuration containment = base.getChild( "implementation" );
+ Configuration containment =
+ getImplementationConfiguration( base.getChild( "implementation" )
);
ContainerDescriptor descriptor = createContainerDescriptor( name,
engine, containment );
Registry registry = m_registry.createChild( name );
List list = createChildContainers( engine, registry, partition,
containment, config, logger );
@@ -656,7 +657,6 @@
//
return createBlock( engine, list, descriptor, name, registry,
Container.PATH_SEPERATOR, config );
-
}
/**
@@ -1065,6 +1065,47 @@
{
final String error = "Unable to create configuration from jar
file: " + jar.getName();
throw new BlockException( error, e );
+ }
+ }
+
+ /**
+ * Check the implementation configuration for a src attribute and if not
null
+ * load an external implememntation configuration.
+ *
+ * @param implementation the block implementation configuration
+ * @return the resolved implementation configuration
+ */
+ private Configuration getImplementationConfiguration( Configuration
implementation )
+ throws ConfigurationException
+ {
+ String path = implementation.getAttribute( "src", null );
+ if( path == null )
+ {
+ getLogger().info( "loading block implementation" );
+ return implementation;
+ }
+ else
+ {
+ File file = new File( m_home, path );
+ try
+ {
+ DefaultConfigurationBuilder builder = new
DefaultConfigurationBuilder();
+ getLogger().info( "loading external block implementation
from: " + file );
+ InputStream input = new FileInputStream( file );
+ if( input == null )
+ {
+ final String error =
+ "Null stream returned from path: " + file;
+ throw new IllegalArgumentException( error );
+ }
+ return builder.build( input );
+ }
+ catch( Throwable e )
+ {
+ final String error =
+ "Unable to load extenal block implementation configuration
from src: " + file;
+ throw new ConfigurationException( error, e );
+ }
}
}
}
1.10 +4 -1 avalon-sandbox/merlin/src/test/config/block.xml
Index: block.xml
===================================================================
RCS file: /home/cvs/avalon-sandbox/merlin/src/test/config/block.xml,v
retrieving revision 1.9
retrieving revision 1.10
diff -u -r1.9 -r1.10
--- block.xml 27 Dec 2002 16:46:43 -0000 1.9
+++ block.xml 7 Jan 2003 06:26:37 -0000 1.10
@@ -17,13 +17,16 @@
and container entities. The block implementation statement is equivalent
to a root container who's name is implied by the name of the block.
-->
- <implementation>
+ <implementation src="external.xml">
+ <!-- use external file or embedded defintion -->
+ <!--
<container name="test">
<appliance name="standard"
class="org.apache.avalon.playground.StandardComponent" activation="startup">
<context class="org.apache.avalon.playground.StandardContextImp"/>
</appliance>
</container>
+ -->
</implementation>
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