/*
* 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.Collection;
import java.util.List;
import org.apache.aries.subsystem.core.internal.ResourceHelper;
import org.osgi.framework.Version;
import org.osgi.framework.VersionRange;
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.subsystem.SubsystemConstants;
public class SubsystemContentHeader extends AbstractClauseBasedHeader<SubsystemContentHeader.Clause> implements RequirementHeader<SubsystemContentHeader.Clause> {
public static class Clause extends AbstractClause {
public static final String ATTRIBUTE_VERSION = VersionRangeAttribute.NAME_VERSION;
public static final String ATTRIBUTE_TYPE = TypeAttribute.NAME;
public static final String DIRECTIVE_RESOLUTION = ResolutionDirective.NAME;
public static final String DIRECTIVE_STARTORDER = StartOrderDirective.NAME;
private static final Collection<Parameter> defaultParameters = generateDefaultParameters(
// A default value for the type attribute is not included here
// because we need to determine in the constructor whether or
// not it was specified as part of the original value.
// See ARIES-1425.
VersionRangeAttribute.DEFAULT_VERSION,
ResolutionDirective.MANDATORY,
// This is an implementation specific start-order directive
// value. The specification states there is no default value.
new StartOrderDirective("0"));
// Was the type attribute specified as part of the original value?
private final boolean isTypeSpecified;
private final String originalValue;
public Clause(String clause) {
super(
parsePath(clause, Patterns.SYMBOLIC_NAME, false),
parseParameters(clause, true),
defaultParameters);
if (parameters.get(TypeAttribute.NAME) == null) {
// The resource type was not specified.
isTypeSpecified = false;
// Add the default type.
parameters.put(TypeAttribute.NAME, TypeAttribute.DEFAULT);
}
else {
// The resource type was specified.
isTypeSpecified = true;
}
originalValue = clause;
}
public String getSymbolicName() {
return path;
}
public int getStartOrder() {
return ((StartOrderDirective)getDirective(DIRECTIVE_STARTORDER)).getStartOrder();
}
public String getType() {
return ((TypeAttribute)getAttribute(ATTRIBUTE_TYPE)).getType();
}
public VersionRange getVersionRange() {
return ((VersionRangeAttribute)getAttribute(ATTRIBUTE_VERSION)).getVersionRange();
}
public boolean isMandatory() {
return ((ResolutionDirective)getDirective(DIRECTIVE_RESOLUTION)).isMandatory();
}
public boolean isTypeSpecified() {
return isTypeSpecified;
}
public SubsystemContentRequirement toRequirement(Resource resource) {
return new SubsystemContentRequirement(this, resource);
}
@Override
public String toString() {
return originalValue;
}
}
public static final String NAME = SubsystemConstants.SUBSYSTEM_CONTENT;
public static SubsystemContentHeader newInstance(Collection<Resource> resources) {
StringBuilder builder = new StringBuilder();
for (Resource resource : resources) {
appendResource(resource, builder);
builder.append(',');
}
// Remove the trailing comma.
// TODO Intentionally letting the exception propagate since there must be at least one resource.
builder.deleteCharAt(builder.length() - 1);
return new SubsystemContentHeader(builder.toString());
}
private static StringBuilder appendResource(Resource resource, StringBuilder builder) {
String symbolicName = ResourceHelper.getSymbolicNameAttribute(resource);
Version version = ResourceHelper.getVersionAttribute(resource);
String type = ResourceHelper.getTypeAttribute(resource);
builder.append(symbolicName)
.append(';')
.append(Clause.ATTRIBUTE_VERSION)
.append("=\"[")
.append(version.toString())
.append(',')
.append(version.toString())
.append("]\";")
.append(Clause.ATTRIBUTE_TYPE)
.append('=')
.append(type);
return builder;
}
private final String originalValue;
public SubsystemContentHeader(String value) {
super(
value,
new ClauseFactory<Clause>() {
@Override
public Clause newInstance(String clause) {
return new Clause(clause);
}
});
originalValue = value;
}
public boolean contains(Resource resource) {
return getClause(resource) != null;
}
public Clause getClause(Resource resource) {
Capability capability = resource.getCapabilities(IdentityNamespace.IDENTITY_NAMESPACE).get(0);
for (Clause clause : clauses) {
Requirement requirement = clause.toRequirement(resource);
if (ResourceHelper.matches(requirement, capability)) {
return clause;
}
}
return null;
}
public boolean isMandatory(Resource resource) {
Clause clause = getClause(resource);
if (clause == null)
return false;
return clause.isMandatory();
}
@Override
public String getName() {
return NAME;
}
@Override
public String getValue() {
return originalValue;
}
@Override
public List<Requirement> toRequirements(Resource resource) {
List<Requirement> requirements = new ArrayList<Requirement>(clauses.size());
for (Clause clause : clauses)
requirements.add(clause.toRequirement(resource));
return requirements;
}
@Override
public String toString() {
return originalValue;
}
}