[JBoss OSGi Development] - Re: FrameworkUtil and Filter implementations
by adrian＠jboss.org
It looks like the osgi code has changed for these classes.
In the version I was using before, the class looked like this.
(See the OSGI-INF/src folder in the r4v41 jar)
| /*
| * $Header: /cvshome/build/org.osgi.framework/src/org/osgi/framework/FrameworkUtil.java,v 1.10 2007/02/21 16:49:05 hargrave Exp $
| *
| * Copyright (c) OSGi Alliance (2005, 2007). All Rights Reserved.
| *
| * 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 org.osgi.framework;
|
| import java.lang.reflect.*;
| import java.security.AccessController;
| import java.security.PrivilegedAction;
|
| /**
| * Framework Utility class.
| *
| * <p>
| * This class contains utility methods which access Framework functions that may
| * be useful to bundles.
| *
| * @since 1.3
| * @ThreadSafe
| * @version $Revision: 1.10 $
| */
| public class FrameworkUtil {
| /*
| * NOTE: A framework implementor may also choose to replace this class in
| * their distribution with a class that directly interfaces with the
| * framework implementation.
| */
|
| /*
| * This class will load the FrameworkUtil class in the package named by the
| * org.osgi.vendor.framework package. For each instance of this class, an
| * instance of the vendor FrameworkUtil class will be created and this class
| * will delegate method calls to the vendor FrameworkUtil instance.
| */
|
| private static class ImplHolder implements PrivilegedAction {
| private static final String packageProperty = "org.osgi.vendor.framework";
|
| /*
| * This is the delegate method used by createFilter.
| */
| static final Method createFilter;
|
| static {
| createFilter = (Method) AccessController.doPrivileged(new ImplHolder());
| }
|
| private ImplHolder() {
| }
|
| public Object run() {
| String packageName = System
| .getProperty(packageProperty);
| if (packageName == null) {
| throw new NoClassDefFoundError(packageProperty
| + " property not set");
| }
|
| Class delegateClass;
| try {
| delegateClass = Class.forName(packageName
| + ".FrameworkUtil");
| }
| catch (ClassNotFoundException e) {
| throw new NoClassDefFoundError(e.toString());
| }
|
| Method result;
| try {
| result = delegateClass.getMethod("createFilter",
| new Class[] {String.class});
| }
| catch (NoSuchMethodException e) {
| throw new NoSuchMethodError(e.toString());
| }
|
| if (!Modifier.isStatic(result.getModifiers())) {
| throw new NoSuchMethodError(
| "createFilter method must be static");
| }
|
| return result;
| }
| }
|
|
| /**
| * FrameworkUtil objects may not be constructed.
| */
| private FrameworkUtil() {}
|
| /**
| * Creates a <code>Filter</code> object. This <code>Filter</code> object
| * may be used to match a <code>ServiceReference</code> object or a
| * <code>Dictionary</code> object.
| *
| * <p>
| * If the filter cannot be parsed, an {@link InvalidSyntaxException} will be
| * thrown with a human readable message where the filter became unparsable.
| *
| * @param filter The filter string.
| * @return A <code>Filter</code> object encapsulating the filter string.
| * @throws InvalidSyntaxException If <code>filter</code> contains an
| * invalid filter string that cannot be parsed.
| * @throws NullPointerException If <code>filter</code> is null.
| *
| * @see Filter
| */
| public static Filter createFilter(String filter)
| throws InvalidSyntaxException {
| try {
| try {
| return (Filter) ImplHolder.createFilter
| .invoke(null, new Object[] {filter});
| }
| catch (InvocationTargetException e) {
| throw e.getTargetException();
| }
| }
| catch (InvalidSyntaxException e) {
| throw e;
| }
| catch (Error e) {
| throw e;
| }
| catch (RuntimeException e) {
| throw e;
| }
| catch (Throwable e) {
| throw new RuntimeException(e.toString());
| }
| }
| }
|
Now the class provides its own implementation of the Filter class.
So we need to decide which of the two implementations is better
(the provided one or the one I wrote).
I'd say it would be easier in terms of maintenance to let FrameworkUtil
provide new features of the filters rather than us having to keep up.
That is unless there is a serious performance issue that needs to be addressed?
Currently all filter construction is delegated to FrameworkUtil so if we go with that
it would just be a case of deleting my filter implementation.
P.S. The same looks to be true for AdminPermission (although I never implemeted that :-)
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16 years, 4 months