// ========================================================================
// Copyright (c) 2004-2011 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.osgi.boot.jsp;
import java.io.IOException;
import java.net.URL;
import java.util.Collection;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import org.eclipse.jetty.osgi.boot.OSGiWebappConstants;
import org.eclipse.jetty.osgi.boot.utils.internal.DefaultFileLocatorHelper;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.webapp.TagLibConfiguration;
import org.eclipse.jetty.webapp.WebAppContext;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleReference;
import org.osgi.service.packageadmin.PackageAdmin;
import org.osgi.util.tracker.ServiceTracker;
/**
* <p>
* Replacement for {@link TagLibConfiguration} for the OSGi integration.
* </p>
* <p>
* In the case of a WAB, tlds can be located in OSGi bundles that are dependencies
* of the WAB.
* It is expected that each WAB lists the symbolic-names of the bundles that contain
* tld files. The list is defined as the value of the header 'Require-TldBundle'
* </p>
* <p>
* Discussions about this are logged in https://bugs.eclipse.org/bugs/show_bug.cgi?id=306971
* </p>
*/
public class TagLibOSGiConfiguration extends TagLibConfiguration
{
private static final Logger LOG = Log.getLogger(TagLibOSGiConfiguration.class);
private ServiceTracker packageAdminServiceTracker = null;
/**
* Override the preConfigure; locates the bundles that contain
* tld files according to the value of the manifest header Require-TldBundle.
* <p>
* Set or add to the property TldProcessor.TLDResources the list of located jars
* so that the super class will scan those.
* </p>
*/
public void preConfigure(WebAppContext context) throws Exception
{
String requireTldBundle = (String)context.getAttribute(OSGiWebappConstants.REQUIRE_TLD_BUNDLE);
if (requireTldBundle != null)
{
Collection<Resource> resources = getRequireTldBundleAsJettyResources(context, requireTldBundle);
if (resources != null && !resources.isEmpty())
{
Collection<Resource> previouslySet = (Collection<Resource>)
context.getAttribute(TagLibConfiguration.TLD_RESOURCES);
if (previouslySet != null)
{
resources.addAll(previouslySet);
}
context.setAttribute(TagLibConfiguration.TLD_RESOURCES, resources);
}
}
super.preConfigure(context);
}
/**
* @param requireTldBundle The comma separated list of bundles' symbolic names
* that contain tld for this osgi webapp.
* @return The collection of jars or folders that match those bundles.
*/
private Collection<Resource> getRequireTldBundleAsJettyResources(
WebAppContext context, String requireTldBundle)
{
Bundle bundle = (Bundle)
context.getAttribute(OSGiWebappConstants.JETTY_OSGI_BUNDLE);
PackageAdmin packAdmin = getBundleAdmin();
String[] symbNames = requireTldBundle.split(", ");
Collection<Resource> tlds = new LinkedHashSet<Resource>();
for (String symbName : symbNames)
{
Bundle[] bs = packAdmin.getBundles(symbName, null);
if (bs == null || bs.length == 0)
{
throw new IllegalArgumentException("Unable to locate the bundle '"
+ symbName + "' specified in the "
+ OSGiWebappConstants.REQUIRE_TLD_BUNDLE
+ " of the manifest of "
+ bundle.getSymbolicName());
}
//take the first one as it is the most recent version?
Enumeration<URL> en = bs[0].findEntries("META-INF", "*.tld", false);
boolean atLeastOneTldFound = false;
while (en.hasMoreElements())
{
atLeastOneTldFound = true;
URL oriUrl = en.nextElement();
URL url = DefaultFileLocatorHelper.getLocalURL(oriUrl);
Resource tldResource;
try
{
tldResource = Resource.newResource(url);
}
catch (IOException e)
{
throw new IllegalArgumentException("Unable to locate the "
+ "tld resource in '"
+ url.toString()
+ "' in the bundle '" + bs[0].getSymbolicName()
+ "' while registering the "
+ OSGiWebappConstants.REQUIRE_TLD_BUNDLE
+ " of the manifest of "
+ bundle.getSymbolicName(), e);
}
tlds.add(tldResource);
}
if (!atLeastOneTldFound)
{
LOG.warn("No '/META-INF/*.tld' resources were found "
+ " in the bundle '" + bs[0].getSymbolicName()
+ "' while registering the "
+ OSGiWebappConstants.REQUIRE_TLD_BUNDLE
+ " of the manifest of "
+ bundle.getSymbolicName());
}
}
return tlds;
}
private PackageAdmin getBundleAdmin()
{
if (packageAdminServiceTracker == null)
{
Bundle bootBundle = ((BundleReference)OSGiWebappConstants.class.getClassLoader()).getBundle();
packageAdminServiceTracker = new ServiceTracker(bootBundle.getBundleContext(),
PackageAdmin.class.getName(), null);
packageAdminServiceTracker.open();
}
return (PackageAdmin) packageAdminServiceTracker.getService();
}
}