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/*
* 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.tuscany.sca.osgi.remoteserviceadmin.impl;
import java.io.IOException;
import java.net.URL;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.UUID;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.implementation.osgi.OSGiImplementationFactory;
import org.apache.tuscany.sca.implementation.osgi.OSGiProperty;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
/**
*
*/
public class OSGiHelper {
public final static String FRAMEWORK_UUID = "org.osgi.framework.uuid";
private OSGiHelper() {
}
/**
* In OSGi, the value of String+ can be a single String, String[] or Collection<String>
* @param value
* @return
*/
public static String[] getStringArray(Object value) {
if (value == null) {
return null;
}
if (value instanceof String) {
return new String[] {(String)value};
} else if (value instanceof Collection) {
Collection<String> collection = (Collection)value;
return collection.toArray(new String[collection.size()]);
}
return (String[])value;
}
public static Collection<String> getStringCollection(Object value) {
String[] values = getStringArray(value);
if (values == null) {
return null;
} else {
return Arrays.asList(values);
}
}
public static String[] getStringArray(ServiceReference serviceReference, String propertyName) {
Object propertyValue = serviceReference.getProperty(propertyName);
return getStringArray(propertyValue);
}
public static Collection<String> getStringCollection(ServiceReference serviceReference, String propertyName) {
Object propertyValue = serviceReference.getProperty(propertyName);
return getStringCollection(propertyValue);
}
public static Filter createFilter(BundleContext context, String filterValue) {
if (filterValue == null) {
return null;
}
try {
return context.createFilter(filterValue);
} catch (InvalidSyntaxException ex) {
throw new IllegalArgumentException("Invalid Filter: " + filterValue, ex);
}
}
/**
* Get a collection of resources that are configured by the given header
* @param bundle The bundle
* @param header
* @param defaultValue
* @return
*/
public static Collection<URL> getConfiguration(Bundle bundle, String header, String defaultValue) {
String value = (String)bundle.getHeaders().get(header);
if (value == null) {
return Collections.emptyList();
}
value = value.trim();
String paths[] = value.split("( |\t|\n|\r|\f|,)+");
if ("".equals(value) || paths.length == 0) {
if (defaultValue != null) {
paths = new String[] {defaultValue};
} else {
paths = new String[0];
}
}
Collection<URL> files = new HashSet<URL>();
for (String path : paths) {
if ("".equals(path)) {
// Skip empty ones
continue;
}
if (path.endsWith("/")) {
path = path + "*.xml";
}
if (!path.startsWith("/")) {
path = "/" + path;
}
int lastIndex = path.lastIndexOf('/');
String root = path.substring(0, lastIndex);
if ("".equals(root)) {
root = "/";
}
String pattern = path.substring(lastIndex + 1);
Enumeration<URL> entries = bundle.findEntries(root, pattern, false);
if (entries != null) {
while (entries.hasMoreElements()) {
files.add(entries.nextElement());
}
}
}
return files;
}
public static Collection<OSGiProperty> getOSGiProperties(ExtensionPointRegistry registry, ServiceReference reference) {
FactoryExtensionPoint factoryExtensionPoint = registry.getExtensionPoint(FactoryExtensionPoint.class);
OSGiImplementationFactory implementationFactory =
factoryExtensionPoint.getFactory(OSGiImplementationFactory.class);
return implementationFactory.createOSGiProperties(reference);
}
public static OSGiProperty createOSGiProperty(ExtensionPointRegistry registry, String name, Object value) {
FactoryExtensionPoint factoryExtensionPoint = registry.getExtensionPoint(FactoryExtensionPoint.class);
OSGiImplementationFactory implementationFactory =
factoryExtensionPoint.getFactory(OSGiImplementationFactory.class);
return implementationFactory.createOSGiProperty(name, value);
}
public synchronized static String getFrameworkUUID(BundleContext bundleContext) {
String uuid = null;
if (bundleContext != null) {
uuid = bundleContext.getProperty(FRAMEWORK_UUID);
} else {
uuid = System.getProperty(FRAMEWORK_UUID);
}
if (uuid == null) {
uuid = UUID.randomUUID().toString();
}
System.setProperty(FRAMEWORK_UUID, uuid);
return uuid;
}
public static ClassLoader createBundleClassLoader(Bundle bundle) {
return new BundleClassLoader(bundle);
}
private static class BundleClassLoader extends ClassLoader {
private Bundle bundle;
public BundleClassLoader(Bundle bundle) {
super(null);
this.bundle = bundle;
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
return bundle.loadClass(name);
}
@Override
protected URL findResource(String name) {
return bundle.getResource(name);
}
@Override
protected Enumeration<URL> findResources(String name) throws IOException {
Enumeration<URL> urls = bundle.getResources(name);
if (urls == null) {
List<URL> list = Collections.emptyList();
return Collections.enumeration(list);
} else {
return urls;
}
}
}
/**
* Find out what elements are added between the oldValues and newValues
* @param oldValues
* @param newValues
* @return
*/
public static Collection<String> getAddedItems(Collection<String> oldValues, Collection<String> newValues) {
if (newValues == null) {
newValues = Collections.emptySet();
}
Collection<String> deltaInterest = new HashSet<String>(newValues);
if (oldValues == null) {
oldValues = Collections.emptySet();
}
deltaInterest.removeAll(oldValues);
return deltaInterest;
}
public static Collection<String> getRemovedItems(Collection<String> oldValues, Collection<String> newValues) {
return getAddedItems(newValues, oldValues);
}
}
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