org.apache.felix.framework.ExtensionManager Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.felix.framework;
import java.io.IOException;
import java.net.InetAddress;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.security.AllPermission;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Set;
import org.apache.felix.framework.util.FelixConstants;
import org.apache.felix.framework.util.ImmutableList;
import org.apache.felix.framework.util.StringMap;
import org.apache.felix.framework.util.Util;
import org.apache.felix.framework.util.manifestparser.ManifestParser;
import org.apache.felix.framework.cache.Content;
import org.apache.felix.framework.util.manifestparser.R4Library;
import org.apache.felix.framework.wiring.BundleCapabilityImpl;
import org.apache.felix.framework.wiring.BundleWireImpl;
import org.osgi.framework.AdminPermission;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
import org.osgi.framework.Version;
import org.osgi.framework.wiring.BundleCapability;
import org.osgi.framework.wiring.BundleRequirement;
import org.osgi.framework.wiring.BundleRevision;
import org.osgi.framework.wiring.BundleWire;
import org.osgi.framework.wiring.BundleWiring;
/**
* The ExtensionManager class is used in several ways.
*
* First, a private instance is added (as URL with the instance as
* URLStreamHandler) to the classloader that loaded the class.
* It is assumed that this is an instance of URLClassloader (if not extension
* bundles will not work). Subsequently, extension bundles can be managed by
* instances of this class (their will be one instance per framework instance).
*
*
* Second, it is used as module definition of the systembundle. Added extension
* bundles with exported packages will contribute their exports to the
* systembundle export.
*
*
* Third, it is used as content loader of the systembundle. Added extension
* bundles exports will be available via this loader.
*
*/
// The general approach is to have one private static instance that we register
// with the parent classloader and one instance per framework instance that
// keeps track of extension bundles and systembundle exports for that framework
// instance.
class ExtensionManager extends URLStreamHandler implements Content
{
// The private instance that is added to Felix.class.getClassLoader() -
// will be null if extension bundles are not supported (i.e., we are not
// loaded by an instance of URLClassLoader)
static final ExtensionManager m_extensionManager;
static
{
// pre-init the url sub-system as otherwise we don't work on gnu/classpath
ExtensionManager extensionManager = null;
if (!"true".equalsIgnoreCase(Felix.m_secureAction.getSystemProperty(
FelixConstants.FELIX_EXTENSIONS_DISABLE, "false")))
{
try
{
(new URL("http://felix.extensions:9/")).openConnection();
}
catch (Throwable t)
{
// This doesn't matter much - we only need the above to init the url subsystem
}
// We use the secure action of Felix to add a new instance to the parent
// classloader.
try
{
extensionManager = new ExtensionManager();
Felix.m_secureAction.addURLToURLClassLoader(Felix.m_secureAction.createURL(
Felix.m_secureAction.createURL(null, "http:", extensionManager),
"http://felix.extensions:9/", extensionManager),
Felix.class.getClassLoader());
}
catch (Throwable ex)
{
// extension bundles will not be supported.
extensionManager = null;
}
}
m_extensionManager = extensionManager;
}
private final Logger m_logger;
private final Map m_configMap;
private final Map m_headerMap = new StringMap();
private final BundleRevision m_systemBundleRevision;
private volatile List m_capabilities = Collections.EMPTY_LIST;
private volatile Set m_exportNames = Collections.EMPTY_SET;
private volatile Object m_securityContext = null;
private final List m_extensions;
private volatile Bundle[] m_extensionsCache;
private final Set m_names;
private final Map m_sourceToExtensions;
// This constructor is only used for the private instance added to the parent
// classloader.
private ExtensionManager()
{
m_logger = null;
m_configMap = null;
m_systemBundleRevision = null;
m_extensions = new ArrayList();
m_extensionsCache = new Bundle[0];
m_names = new HashSet();
m_sourceToExtensions = new HashMap();
}
/**
* This constructor is used to create one instance per framework instance.
* The general approach is to have one private static instance that we register
* with the parent classloader and one instance per framework instance that
* keeps track of extension bundles and systembundle exports for that framework
* instance.
*
* @param logger the logger to use.
* @param config the configuration to read properties from.
* @param systemBundleInfo the info to change if we need to add exports.
*/
ExtensionManager(Logger logger, Map configMap, Felix felix)
{
m_logger = logger;
m_configMap = configMap;
m_systemBundleRevision = new ExtensionManagerRevision(felix);
m_extensions = null;
m_extensionsCache = null;
m_names = null;
m_sourceToExtensions = null;
// TODO: FRAMEWORK - Not all of this stuff really belongs here, probably only exports.
// Populate system bundle header map.
m_headerMap.put(FelixConstants.BUNDLE_VERSION,
m_configMap.get(FelixConstants.FELIX_VERSION_PROPERTY));
m_headerMap.put(FelixConstants.BUNDLE_SYMBOLICNAME,
FelixConstants.SYSTEM_BUNDLE_SYMBOLICNAME);
m_headerMap.put(FelixConstants.BUNDLE_NAME, "System Bundle");
m_headerMap.put(FelixConstants.BUNDLE_DESCRIPTION,
"This bundle is system specific; it implements various system services.");
m_headerMap.put(FelixConstants.EXPORT_SERVICE,
"org.osgi.service.packageadmin.PackageAdmin," +
"org.osgi.service.startlevel.StartLevel," +
"org.osgi.service.url.URLHandlers");
// The system bundle exports framework packages as well as
// arbitrary user-defined packages from the system class path.
// We must construct the system bundle's export metadata.
// Get configuration property that specifies which class path
// packages should be exported by the system bundle.
String syspkgs =
(String) m_configMap.get(FelixConstants.FRAMEWORK_SYSTEMPACKAGES);
// If no system packages were specified, load our default value.
syspkgs = (syspkgs == null)
? Util.getDefaultProperty(logger, Constants.FRAMEWORK_SYSTEMPACKAGES)
: syspkgs;
syspkgs = (syspkgs == null) ? "" : syspkgs;
// If any extra packages are specified, then append them.
String pkgextra =
(String) m_configMap.get(FelixConstants.FRAMEWORK_SYSTEMPACKAGES_EXTRA);
syspkgs = ((pkgextra == null) || (pkgextra.trim().length() == 0))
? syspkgs : syspkgs + "," + pkgextra;
m_headerMap.put(FelixConstants.BUNDLE_MANIFESTVERSION, "2");
m_headerMap.put(FelixConstants.EXPORT_PACKAGE, syspkgs);
// The system bundle alsp provides framework generic capabilities
// as well as arbitrary user-defined generic capabilities. We must
// construct the system bundle's capabilitie metadata. Get the
// configuration property that specifies which capabilities should
// be provided by the system bundle.
String syscaps =
(String) m_configMap.get(FelixConstants.FRAMEWORK_SYSTEMCAPABILITIES);
// If no system capabilities were specified, load our default value.
syscaps = (syscaps == null)
? Util.getDefaultProperty(logger, Constants.FRAMEWORK_SYSTEMCAPABILITIES)
: syscaps;
syscaps = (syscaps == null) ? "" : syscaps;
// If any extra capabilities are specified, then append them.
String capextra =
(String) m_configMap.get(FelixConstants.FRAMEWORK_SYSTEMCAPABILITIES_EXTRA);
syscaps = ((capextra == null) || (capextra.trim().length() == 0))
? syscaps : syscaps + "," + capextra;
m_headerMap.put(FelixConstants.PROVIDE_CAPABILITY, syscaps);
try
{
ManifestParser mp = new ManifestParser(
m_logger, m_configMap, m_systemBundleRevision, m_headerMap);
List caps = aliasSymbolicName(mp.getCapabilities());
appendCapabilities(caps);
}
catch (Exception ex)
{
m_capabilities = Collections.EMPTY_LIST;
m_logger.log(
Logger.LOG_ERROR,
"Error parsing system bundle export statement: "
+ syspkgs, ex);
}
}
private static List aliasSymbolicName(List caps)
{
if (caps == null)
{
return new ArrayList(0);
}
List aliasCaps = new ArrayList(caps);
String[] aliases = {
FelixConstants.SYSTEM_BUNDLE_SYMBOLICNAME,
Constants.SYSTEM_BUNDLE_SYMBOLICNAME };
for (int capIdx = 0; capIdx < aliasCaps.size(); capIdx++)
{
BundleCapability cap = aliasCaps.get(capIdx);
// Need to alias bundle and host capabilities.
if (cap.getNamespace().equals(BundleRevision.BUNDLE_NAMESPACE)
|| cap.getNamespace().equals(BundleRevision.HOST_NAMESPACE))
{
// Make a copy of the attribute array.
Map aliasAttrs =
new HashMap(cap.getAttributes());
// Add the aliased value.
aliasAttrs.put(cap.getNamespace(), aliases);
// Create the aliased capability to replace the old capability.
cap = new BundleCapabilityImpl(
cap.getRevision(),
cap.getNamespace(),
cap.getDirectives(),
aliasAttrs);
aliasCaps.set(capIdx, cap);
}
// Further, search attributes for bundle symbolic name and alias it too.
for (Entry entry : cap.getAttributes().entrySet())
{
// If there is a bundle symbolic name attribute, add the
// standard alias as a value.
if (entry.getKey().equalsIgnoreCase(Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE))
{
// Make a copy of the attribute array.
Map aliasAttrs =
new HashMap(cap.getAttributes());
// Add the aliased value.
aliasAttrs.put(Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE, aliases);
// Create the aliased capability to replace the old capability.
aliasCaps.set(capIdx, new BundleCapabilityImpl(
cap.getRevision(),
cap.getNamespace(),
cap.getDirectives(),
aliasAttrs));
// Continue with the next capability.
break;
}
}
}
return aliasCaps;
}
public BundleRevision getRevision()
{
return m_systemBundleRevision;
}
public Object getSecurityContext()
{
return m_securityContext;
}
public synchronized void setSecurityContext(Object securityContext)
{
m_securityContext = securityContext;
}
/**
* Add an extension bundle. The bundle will be added to the parent classloader
* and it's exported packages will be added to the module definition
* exports of this instance. Subsequently, they are available form the
* instance in it's role as content loader.
*
* @param felix the framework instance the given extension bundle comes from.
* @param bundle the extension bundle to add.
* @throws BundleException if extension bundles are not supported or this is
* not a framework extension.
* @throws SecurityException if the caller does not have the needed
* AdminPermission.EXTENSIONLIFECYCLE and security is enabled.
* @throws Exception in case something goes wrong.
*/
synchronized void addExtensionBundle(Felix felix, BundleImpl bundle)
throws SecurityException, BundleException, Exception
{
Object sm = System.getSecurityManager();
if (sm != null)
{
((SecurityManager) sm).checkPermission(
new AdminPermission(bundle, AdminPermission.EXTENSIONLIFECYCLE));
if (!((BundleProtectionDomain) bundle.getProtectionDomain()).impliesDirect(new AllPermission()))
{
throw new SecurityException("Extension Bundles must have AllPermission");
}
}
String directive = ManifestParser.parseExtensionBundleHeader((String)
((BundleRevisionImpl) bundle.adapt(BundleRevision.class))
.getHeaders().get(Constants.FRAGMENT_HOST));
// We only support classpath extensions (not bootclasspath).
if (!Constants.EXTENSION_FRAMEWORK.equals(directive))
{
throw new BundleException("Unsupported Extension Bundle type: " +
directive, new UnsupportedOperationException(
"Unsupported Extension Bundle type!"));
}
try
{
// Merge the exported packages with the exported packages of the systembundle.
List exports = null;
try
{
exports = ManifestParser.parseExportHeader(
m_logger, m_systemBundleRevision,
(String) ((BundleRevisionImpl) bundle.adapt(BundleRevision.class))
.getHeaders().get(Constants.EXPORT_PACKAGE),
m_systemBundleRevision.getSymbolicName(), m_systemBundleRevision.getVersion());
exports = aliasSymbolicName(exports);
}
catch (Exception ex)
{
m_logger.log(
bundle,
Logger.LOG_ERROR,
"Error parsing extension bundle export statement: "
+ ((BundleRevisionImpl) bundle.adapt(BundleRevision.class))
.getHeaders().get(Constants.EXPORT_PACKAGE), ex);
return;
}
// Add the bundle as extension if we support extensions
if (m_extensionManager != null)
{
// This needs to be the private instance.
m_extensionManager.addExtension(felix, bundle);
}
else
{
// We don't support extensions (i.e., the parent is not an URLClassLoader).
m_logger.log(bundle, Logger.LOG_WARNING,
"Unable to add extension bundle to FrameworkClassLoader - Maybe not an URLClassLoader?");
throw new UnsupportedOperationException(
"Unable to add extension bundle to FrameworkClassLoader - Maybe not an URLClassLoader?");
}
appendCapabilities(exports);
}
catch (Exception ex)
{
throw ex;
}
BundleRevisionImpl bri = (BundleRevisionImpl) bundle.adapt(BundleRevision.class);
List reqs = bri.getDeclaredRequirements(BundleRevision.HOST_NAMESPACE);
List caps = getCapabilities(BundleRevision.HOST_NAMESPACE);
BundleWire bw = new BundleWireImpl(bri, reqs.get(0), m_systemBundleRevision, caps.get(0));
bri.resolve(
new BundleWiringImpl(
m_logger,
m_configMap,
null,
bri,
null,
Collections.singletonList(bw),
Collections.EMPTY_MAP,
Collections.EMPTY_MAP));
felix.getDependencies().addDependent(bw);
felix.setBundleStateAndNotify(bundle, Bundle.RESOLVED);
}
/**
* This is a Felix specific extension mechanism that allows extension bundles
* to have activators and be started via this method.
*
* @param felix the framework instance the extension bundle is installed in.
* @param bundle the extension bundle to start if it has a Felix specific activator.
*/
void startExtensionBundle(Felix felix, BundleImpl bundle)
{
String activatorClass = (String)
((BundleRevisionImpl) bundle.adapt(BundleRevision.class))
.getHeaders().get(FelixConstants.FELIX_EXTENSION_ACTIVATOR);
if (activatorClass != null)
{
try
{
// TODO: SECURITY - Should this consider security?
BundleActivator activator = (BundleActivator)
felix.getClass().getClassLoader().loadClass(
activatorClass.trim()).newInstance();
// TODO: EXTENSIONMANAGER - This is kind of hacky, can we improve it?
felix.m_activatorList.add(activator);
BundleContext context = felix._getBundleContext();
bundle.setBundleContext(context);
if ((felix.getState() == Bundle.ACTIVE) || (felix.getState() == Bundle.STARTING))
{
Felix.m_secureAction.startActivator(activator, context);
}
}
catch (Throwable ex)
{
m_logger.log(bundle, Logger.LOG_WARNING,
"Unable to start Felix Extension Activator", ex);
}
}
}
/**
* Remove all extension registered by the given framework instance. Note, it
* is not possible to unregister allready loaded classes form those extensions.
* That is why the spec requires a JVM restart.
*
* @param felix the framework instance whose extensions need to be unregistered.
*/
void removeExtensions(Felix felix)
{
if (m_extensionManager != null)
{
m_extensionManager._removeExtensions(felix);
}
}
private List getCapabilities(String namespace)
{
List caps = m_capabilities;
List result = caps;
if (namespace != null)
{
result = new ArrayList();
for (BundleCapability cap : caps)
{
if (cap.getNamespace().equals(namespace))
{
result.add(cap);
}
}
}
return result;
}
private synchronized void appendCapabilities(List caps)
{
List newCaps =
new ArrayList(m_capabilities.size() + caps.size());
newCaps.addAll(m_capabilities);
newCaps.addAll(caps);
m_capabilities = ImmutableList.newInstance(newCaps);
m_headerMap.put(Constants.EXPORT_PACKAGE, convertCapabilitiesToHeaders(m_headerMap));
}
private String convertCapabilitiesToHeaders(Map headers)
{
StringBuffer exportSB = new StringBuffer("");
Set exportNames = new HashSet();
List caps = m_capabilities;
for (BundleCapability cap : caps)
{
if (cap.getNamespace().equals(BundleRevision.PACKAGE_NAMESPACE))
{
// Add a comma separate if there is an existing package.
if (exportSB.length() > 0)
{
exportSB.append(", ");
}
// Append exported package information.
exportSB.append(cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE));
for (Entry entry : cap.getDirectives().entrySet())
{
exportSB.append("; ");
exportSB.append(entry.getKey());
exportSB.append(":=\"");
exportSB.append(entry.getValue());
exportSB.append("\"");
}
for (Entry entry : cap.getAttributes().entrySet())
{
if (!entry.getKey().equals(BundleRevision.PACKAGE_NAMESPACE)
&& !entry.getKey().equals(Constants.BUNDLE_SYMBOLICNAME_ATTRIBUTE)
&& !entry.getKey().equals(Constants.BUNDLE_VERSION_ATTRIBUTE))
{
exportSB.append("; ");
exportSB.append(entry.getKey());
exportSB.append("=\"");
exportSB.append(entry.getValue());
exportSB.append("\"");
}
}
// Remember exported packages.
exportNames.add(
(String) cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE));
}
}
m_exportNames = exportNames;
return exportSB.toString();
}
//
// Classpath Extension
//
/*
* See whether any registered extension provides the class requested. If not
* throw an IOException.
*/
public URLConnection openConnection(URL url) throws IOException
{
String path = url.getPath();
if (path.trim().equals("/"))
{
return new URLHandlersBundleURLConnection(url);
}
Bundle[] extensions = m_extensionsCache;
URL result = null;
for (Bundle extBundle : extensions)
{
try
{
BundleRevisionImpl bri =
(BundleRevisionImpl) extBundle.adapt(BundleRevision.class);
if (bri != null)
{
result = bri.getResourceLocal(path);
}
}
catch (Exception ex)
{
// Maybe the bundle went away, so ignore this exception.
}
if (result != null)
{
return result.openConnection();
}
}
return new URLConnection(url)
{
public void connect() throws IOException
{
throw new IOException("Resource not provided by any extension!");
}
};
}
@Override
protected InetAddress getHostAddress(URL u)
{
// the extension URLs do not address real hosts
return null;
}
private synchronized void addExtension(Object source, Bundle extension)
{
List sourceExtensions = (List) m_sourceToExtensions.get(source);
if (sourceExtensions == null)
{
sourceExtensions = new ArrayList();
m_sourceToExtensions.put(source, sourceExtensions);
}
sourceExtensions.add(extension);
_add(extension.getSymbolicName(), extension);
m_extensionsCache = (Bundle[])
m_extensions.toArray(new Bundle[m_extensions.size()]);
}
private synchronized void _removeExtensions(Object source)
{
if (m_sourceToExtensions.remove(source) == null)
{
return;
}
m_extensions.clear();
m_names.clear();
for (Iterator iter = m_sourceToExtensions.values().iterator(); iter.hasNext();)
{
List extensions = (List) iter.next();
for (Iterator extIter = extensions.iterator(); extIter.hasNext();)
{
Bundle bundle = (Bundle) extIter.next();
_add(bundle.getSymbolicName(), bundle);
}
m_extensionsCache = (Bundle[])
m_extensions.toArray(new Bundle[m_extensions.size()]);
}
}
private void _add(String name, Bundle extension)
{
if (!m_names.contains(name))
{
m_names.add(name);
m_extensions.add(extension);
}
}
public void close()
{
// Do nothing on close, since we have nothing open.
}
public Enumeration getEntries()
{
return new Enumeration()
{
public boolean hasMoreElements()
{
return false;
}
public Object nextElement() throws NoSuchElementException
{
throw new NoSuchElementException();
}
};
}
public boolean hasEntry(String name) {
return false;
}
public byte[] getEntryAsBytes(String name)
{
return null;
}
public InputStream getEntryAsStream(String name) throws IOException
{
return null;
}
public Content getEntryAsContent(String name)
{
return null;
}
public String getEntryAsNativeLibrary(String name)
{
return null;
}
public URL getEntryAsURL(String name)
{
return null;
}
//
// Utility methods.
//
class ExtensionManagerRevision extends BundleRevisionImpl
{
private final Version m_version;
private volatile BundleWiring m_wiring;
ExtensionManagerRevision(Felix felix)
{
super(felix, "0");
m_version = new Version((String)
m_configMap.get(FelixConstants.FELIX_VERSION_PROPERTY));
}
@Override
public Map getHeaders()
{
synchronized (ExtensionManager.this)
{
return m_headerMap;
}
}
@Override
public List getDeclaredCapabilities(String namespace)
{
return ExtensionManager.this.getCapabilities(namespace);
}
@Override
public String getSymbolicName()
{
return FelixConstants.SYSTEM_BUNDLE_SYMBOLICNAME;
}
@Override
public Version getVersion()
{
return m_version;
}
@Override
public void close()
{
// Nothing needed here.
}
@Override
public Content getContent()
{
return ExtensionManager.this;
}
@Override
public URL getEntry(String name)
{
// There is no content for the system bundle, so return null.
return null;
}
@Override
public boolean hasInputStream(int index, String urlPath)
{
return (getClass().getClassLoader().getResource(urlPath) != null);
}
@Override
public InputStream getInputStream(int index, String urlPath)
{
return getClass().getClassLoader().getResourceAsStream(urlPath);
}
@Override
public URL getLocalURL(int index, String urlPath)
{
return getClass().getClassLoader().getResource(urlPath);
}
@Override
public void resolve(BundleWiringImpl wire)
{
try
{
m_wiring = new ExtensionManagerWiring(
m_logger, m_configMap, this);
}
catch (Exception ex)
{
// This should never happen.
}
}
@Override
public BundleWiring getWiring()
{
return m_wiring;
}
}
class ExtensionManagerWiring extends BundleWiringImpl
{
ExtensionManagerWiring(
Logger logger, Map configMap, BundleRevisionImpl revision)
throws Exception
{
super(logger, configMap, null, revision,
null, Collections.EMPTY_LIST, null, null);
}
@Override
public ClassLoader getClassLoader()
{
return getClass().getClassLoader();
}
@Override
public List getCapabilities(String namespace)
{
return ExtensionManager.this.getCapabilities(namespace);
}
@Override
public List getNativeLibraries()
{
return Collections.EMPTY_LIST;
}
@Override
public Class getClassByDelegation(String name) throws ClassNotFoundException
{
Class clazz = null;
String pkgName = Util.getClassPackage(name);
if (shouldBootDelegate(pkgName))
{
try
{
// Get the appropriate class loader for delegation.
ClassLoader bdcl = getBootDelegationClassLoader();
clazz = bdcl.loadClass(name);
// If this is a java.* package, then always terminate the
// search; otherwise, continue to look locally if not found.
if (pkgName.startsWith("java.") || (clazz != null))
{
return clazz;
}
}
catch (ClassNotFoundException ex)
{
// If this is a java.* package, then always terminate the
// search; otherwise, continue to look locally if not found.
if (pkgName.startsWith("java."))
{
throw ex;
}
}
}
if (clazz == null)
{
if (!m_exportNames.contains(Util.getClassPackage(name)))
{
throw new ClassNotFoundException(name);
}
clazz = getClass().getClassLoader().loadClass(name);
}
return clazz;
}
@Override
public URL getResourceByDelegation(String name)
{
return getClass().getClassLoader().getResource(name);
}
@Override
public Enumeration getResourcesByDelegation(String name)
{
try
{
return getClass().getClassLoader().getResources(name);
}
catch (IOException ex)
{
return null;
}
}
@Override
public void dispose()
{
// Nothing needed here.
}
}
}
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