/*
* 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.core.archive;
import java.util.ArrayList;
import java.util.List;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.namespace.service.ServiceNamespace;
import org.osgi.resource.Capability;
import org.osgi.resource.Resource;
import org.osgi.service.subsystem.SubsystemConstants;
public class SubsystemExportServiceHeader extends AbstractClauseBasedHeader<SubsystemExportServiceHeader.Clause> {
public static class Clause extends AbstractClause {
public static final String DIRECTIVE_FILTER = Constants.FILTER_DIRECTIVE;
public Clause(String clause) {
super(
parsePath(clause, Patterns.OBJECTCLASS_OR_STAR, false),
parseParameters(clause, false),
generateDefaultParameters());
}
public String getObjectClass() {
return path;
}
public List<Capability> toCapabilities(Resource resource) throws InvalidSyntaxException {
List<Capability> capabilities = resource.getCapabilities(ServiceNamespace.SERVICE_NAMESPACE);
if (capabilities.isEmpty())
return capabilities;
Filter filter = computeFilter();
ArrayList<Capability> result = new ArrayList<Capability>(capabilities.size());
for (Capability capability : capabilities)
if (filter.matches(capability.getAttributes()))
result.add(capability);
result.trimToSize();
return result;
}
private Filter computeFilter() throws InvalidSyntaxException {
return FrameworkUtil.createFilter(computeFilterString());
}
private String computeFilterString() {
Directive directive = getDirective(DIRECTIVE_FILTER);
return new StringBuilder()
.append("(&(")
.append(ServiceNamespace.CAPABILITY_OBJECTCLASS_ATTRIBUTE)
.append('=')
.append(path)
.append(')')
.append(directive == null ? "" : directive.getValue())
.append(')')
.toString();
}
}
public static final String NAME = SubsystemConstants.SUBSYSTEM_EXPORTSERVICE;
public SubsystemExportServiceHeader(String value) {
super(
value,
new ClauseFactory<Clause>() {
@Override
public Clause newInstance(String clause) {
return new Clause(clause);
}
});
}
@Override
public String getName() {
return NAME;
}
@Override
public String getValue() {
return toString();
}
public List<Capability> toCapabilities(Resource resource) throws InvalidSyntaxException {
List<Capability> result = new ArrayList<Capability>();
for (Clause clause : clauses)
result.addAll(clause.toCapabilities(resource));
return result;
}
}