package org.osgi.service.indexer.impl;
import java.util.List;
import org.osgi.framework.Version;
import org.osgi.service.indexer.Builder;
import org.osgi.service.indexer.Capability;
import org.osgi.service.indexer.Namespaces;
import org.osgi.service.indexer.Requirement;
import org.osgi.service.indexer.Resource;
import org.osgi.service.indexer.ResourceAnalyzer;
import org.osgi.service.log.LogService;
/**
* Detects JARs that are OSGi Frameworks, using the presence of META-INF/services/org.osgi.framework.launch.FrameworkFactory
*/
public class OSGiFrameworkAnalyzer implements ResourceAnalyzer {
private static final String SERVICE_FRAMEWORK_FACTORY = "META-INF/services/org.osgi.framework.launch.FrameworkFactory";
private static final String FRAMEWORK_PACKAGE = "org.osgi.framework";
private final LogService log;
public OSGiFrameworkAnalyzer(LogService log) {
this.log = log;
}
public void analyzeResource(Resource resource, List<Capability> caps, List<Requirement> reqs) throws Exception {
Resource fwkFactorySvc = resource.getChild(SERVICE_FRAMEWORK_FACTORY);
if (fwkFactorySvc != null) {
Builder builder = new Builder().setNamespace(Namespaces.NS_CONTRACT).addAttribute(Namespaces.NS_CONTRACT, Namespaces.CONTRACT_OSGI_FRAMEWORK);
Version specVersion = null;
StringBuilder uses = new StringBuilder();
boolean firstPkg = true;
for (Capability cap : caps) {
if (Namespaces.NS_WIRING_PACKAGE.equals(cap.getNamespace())) {
// Add to the uses directive
if (!firstPkg)
uses.append(',');
String pkgName = (String) cap.getAttributes().get(Namespaces.NS_WIRING_PACKAGE);
uses.append(pkgName);
firstPkg = false;
// If it's org.osgi.framework, get the package version and map to OSGi spec version
if (FRAMEWORK_PACKAGE.equals(pkgName)) {
Version frameworkPkgVersion = (Version) cap.getAttributes().get(Namespaces.ATTR_VERSION);
specVersion = mapFrameworkPackageVersion(frameworkPkgVersion);
}
}
}
if (specVersion != null)
builder.addAttribute(Namespaces.ATTR_VERSION, specVersion);
builder.addDirective(Namespaces.DIRECTIVE_USES, uses.toString());
caps.add(builder.buildCapability());
}
}
/**
* Map the version of package {@code org.osgi.framework} to an OSGi
* specification release version
*
* @param pv
* Version of the {@code org.osgi.framework} packge
* @return The OSGi specification release version, or {@code null} if not
* known.
*/
private Version mapFrameworkPackageVersion(Version pv) {
if (pv.getMajor() != 1)
return null;
Version version;
switch (pv.getMinor()) {
case 7:
version = new Version(5, 0, 0);
break;
case 6:
version = new Version(4, 3, 0);
break;
case 5:
version = new Version(4, 2, 0);
break;
case 4:
version = new Version(4, 1, 0);
break;
case 3:
version = new Version(4, 0, 0);
break;
case 2:
version = new Version(3, 0, 0);
break;
case 1:
version = new Version(2, 0, 0);
break;
case 0:
version = new Version(1, 0, 0);
break;
default:
version = null;
break;
}
return version;
}
}