/*
* 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.apache.aries.subsystem.obr.internal;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.osgi.framework.Constants;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.Version;
import org.osgi.framework.namespace.IdentityNamespace;
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
import org.osgi.resource.Resource;
import org.osgi.service.repository.Repository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ResourceHelper {
private static final Logger logger = LoggerFactory.getLogger(ResourceHelper.class);
public static String getContentAttribute(Resource resource) {
// TODO Add to constants.
return (String)getContentAttribute(resource, "osgi.content");
}
public static Object getContentAttribute(Resource resource, String name) {
// TODO Add to constants.
List<Capability> capabilities = resource.getCapabilities("osgi.content");
Capability capability = capabilities.get(0);
return capability.getAttributes().get(name);
}
public static Object getIdentityAttribute(Resource resource, String name) {
List<Capability> capabilities = resource.getCapabilities(IdentityNamespace.IDENTITY_NAMESPACE);
Capability capability = capabilities.get(0);
return capability.getAttributes().get(name);
}
public static Resource getResource(Requirement requirement, Repository repository) {
Map<Requirement, Collection<Capability>> map = repository.findProviders(Arrays.asList(requirement));
Collection<Capability> capabilities = map.get(requirement);
return capabilities == null ? null : capabilities.size() == 0 ? null : capabilities.iterator().next().getResource();
}
public static String getSymbolicNameAttribute(Resource resource) {
return (String)getIdentityAttribute(resource, IdentityNamespace.IDENTITY_NAMESPACE);
}
public static String getTypeAttribute(Resource resource) {
String result = (String)getIdentityAttribute(resource, IdentityNamespace.CAPABILITY_TYPE_ATTRIBUTE);
if (result == null)
result = IdentityNamespace.TYPE_BUNDLE;
return result;
}
public static Version getVersionAttribute(Resource resource) {
Version result = (Version)getIdentityAttribute(resource, IdentityNamespace.CAPABILITY_VERSION_ATTRIBUTE);
if (result == null)
result = Version.emptyVersion;
return result;
}
public static boolean matches(Requirement requirement, Capability capability) {
// if (logger.isDebugEnabled())
// logger.debug(LOG_ENTRY, "matches", new Object[]{requirement, capability});
boolean result = false;
if (requirement == null && capability == null)
result = true;
else if (requirement == null || capability == null)
result = false;
else if (!capability.getNamespace().equals(requirement.getNamespace()))
result = false;
else {
String filterStr = requirement.getDirectives().get(Constants.FILTER_DIRECTIVE);
if (filterStr == null)
result = true;
else {
try {
if (FrameworkUtil.createFilter(filterStr).matches(capability.getAttributes()))
result = true;
}
catch (InvalidSyntaxException e) {
logger.debug("Requirement had invalid filter string: " + requirement, e);
result = false;
}
}
}
// TODO Check directives.
// logger.debug(LOG_EXIT, "matches", result);
return result;
}
}