/*******************************************************************************
* Copyright (c) 2007 Spring IDE Developers
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Spring IDE Developers - initial API and implementation
*******************************************************************************/
package org.springframework.ide.eclipse.beans.osgibridge;
import java.util.Stack;
import org.springframework.beans.factory.xml.NamespaceHandler;
import org.springframework.beans.factory.xml.NamespaceHandlerResolver;
/**
* Uses Spring OSGi infrastructure services to locate installed
* {@link NamespaceHandlerResolver} with any bundles.
* @author Christian Dupuis
* @since 2.0.1
*/
public class OsgiBridgingNamespaceHandlerResolver extends AbstractBundleContextAware
implements NamespaceHandlerResolver {
/**
* Resolve the namespace URI and return the located {@link NamespaceHandler}
* implementation.
* @param namespaceUri the relevant namespace URI
* @return the located {@link NamespaceHandler} (may be <code>null</code>)
*/
public NamespaceHandler resolve(final String namespaceUri) {
final Stack<NamespaceHandler> handlers = new Stack<NamespaceHandler>();
try {
OsgiUtils.executeCallback(
new OsgiUtils.OsgiServiceCallback() {
public void doWithService(Object service) {
if (service instanceof NamespaceHandlerResolver) {
NamespaceHandler handler = ((NamespaceHandlerResolver) service)
.resolve(namespaceUri);
if (handler != null) {
handlers.push(handler);
}
}
}
}, getBundleContext(),
NamespaceHandlerResolver.class);
}
catch (Exception e) {
// don't really care here
}
if (!handlers.isEmpty()) {
return handlers.pop();
}
return null;
}
}