final void addExportedProvidersFor(
String symbolicName, String packageName, ArrayList result, KeyedHashSet visited) {
if (!visited.add(bundle)) return;
// See if we locally provide the package.
PackageSource local = null;
if (isExportedPackage(packageName)) local = proxy.getPackageSource(packageName);
else if (isSubstitutedExport(packageName)) {
result.add(findImportedSource(packageName, visited));
return; // should not continue to required bundles in this case
}
// Must search required bundles that are exported first.
if (requiredBundles != null) {
int size = reexportTable == null ? 0 : reexportTable.length;
int reexportIndex = 0;
for (int i = 0; i < requiredBundles.length; i++) {
if (local != null) {
// always add required bundles first if we locally provide the package
// This allows a bundle to provide a package from a required bundle without
// re-exporting the whole required bundle.
requiredBundles[i]
.getBundleLoader()
.addExportedProvidersFor(symbolicName, packageName, result, visited);
} else if (reexportIndex < size && reexportTable[reexportIndex] == i) {
reexportIndex++;
requiredBundles[i]
.getBundleLoader()
.addExportedProvidersFor(symbolicName, packageName, result, visited);
}
}
}
// now add the locally provided package.
if (local != null && local.isFriend(symbolicName)) result.add(local);
}
private PackageSource findRequiredSource(String pkgName, KeyedHashSet visited) {
if (requiredBundles == null) return null;
synchronized (requiredSources) {
PackageSource result = (PackageSource) requiredSources.getByKey(pkgName);
if (result != null) return result.isNullSource() ? null : result;
}
if (visited == null) visited = new KeyedHashSet(false);
visited.add(bundle); // always add ourselves so we do not recurse back to ourselves
ArrayList result = new ArrayList(3);
for (int i = 0; i < requiredBundles.length; i++) {
BundleLoader requiredLoader = requiredBundles[i].getBundleLoader();
requiredLoader.addExportedProvidersFor(proxy.getSymbolicName(), pkgName, result, visited);
}
// found some so cache the result for next time and return
PackageSource source;
if (result.size() == 0) {
// did not find it in our required bundles lets record the failure
// so we do not have to do the search again for this package.
source = NullPackageSource.getNullPackageSource(pkgName);
} else if (result.size() == 1) {
// if there is just one source, remember just the single source
source = (PackageSource) result.get(0);
} else {
// if there was more than one source, build a multisource and cache that.
PackageSource[] srcs = (PackageSource[]) result.toArray(new PackageSource[result.size()]);
source = createMultiSource(pkgName, srcs);
}
synchronized (requiredSources) {
requiredSources.add(source);
}
return source.isNullSource() ? null : source;
}
/**
* Finds the resources for a bundle. This method is used for delegation by the bundle's
* classloader.
*/
public Enumeration findResources(String name) throws IOException {
// do not delegate to parent because ClassLoader#getResources already did and it is final!!
if ((name.length() > 1) && (name.charAt(0) == '/')) /* if name has a leading slash */
name = name.substring(1); /* remove leading slash before search */
String pkgName = getResourcePackageName(name);
Enumeration result = null;
try {
result = (Enumeration) searchHooks(name, PRE_RESOURCES);
} catch (ClassNotFoundException e) {
// will not happen
} catch (FileNotFoundException e) {
return null;
}
if (result != null) return result;
// start at step 3 because of the comment above about ClassLoader#getResources
// 3) search the imported packages
PackageSource source = findImportedSource(pkgName, null);
if (source != null)
// 3) found import source terminate search at the source
return source.getResources(name);
// 4) search the required bundles
source = findRequiredSource(pkgName, null);
if (source != null)
// 4) attempt to load from source but continue on failure
result = source.getResources(name);
// 5) search the local bundle
// compound the required source results with the local ones
Enumeration localResults = findLocalResources(name);
result = compoundEnumerations(result, localResults);
// 6) attempt to find a dynamic import source; only do this if a required source was not found
if (result == null && source == null) {
source = findDynamicSource(pkgName);
if (source != null) return source.getResources(name);
}
if (result == null)
try {
result = (Enumeration) searchHooks(name, POST_RESOURCES);
} catch (ClassNotFoundException e) {
// will not happen
} catch (FileNotFoundException e) {
return null;
}
if (policy != null) {
Enumeration buddyResult = policy.doBuddyResourcesLoading(name);
result = compoundEnumerations(result, buddyResult);
}
return result;
}
URL findResource(String name, boolean checkParent) {
if ((name.length() > 1) && (name.charAt(0) == '/')) /* if name has a leading slash */
name = name.substring(1); /* remove leading slash before search */
String pkgName = getResourcePackageName(name);
boolean bootDelegation = false;
ClassLoader parentCL = getParentClassLoader();
// follow the OSGi delegation model
// First check the parent classloader for system resources, if it is a java resource.
if (checkParent && parentCL != null) {
if (pkgName.startsWith(JAVA_PACKAGE))
// 1) if startsWith "java." delegate to parent and terminate search
// we never delegate java resource requests past the parent
return parentCL.getResource(name);
else if (bundle.getFramework().isBootDelegationPackage(pkgName)) {
// 2) if part of the bootdelegation list then delegate to parent and continue of failure
URL result = parentCL.getResource(name);
if (result != null) return result;
bootDelegation = true;
}
}
URL result = null;
try {
result = (URL) searchHooks(name, PRE_RESOURCE);
} catch (FileNotFoundException e) {
return null;
} catch (ClassNotFoundException e) {
// will not happen
}
if (result != null) return result;
// 3) search the imported packages
PackageSource source = findImportedSource(pkgName, null);
if (source != null)
// 3) found import source terminate search at the source
return source.getResource(name);
// 4) search the required bundles
source = findRequiredSource(pkgName, null);
if (source != null)
// 4) attempt to load from source but continue on failure
result = source.getResource(name);
// 5) search the local bundle
if (result == null) result = findLocalResource(name);
if (result != null) return result;
// 6) attempt to find a dynamic import source; only do this if a required source was not found
if (source == null) {
source = findDynamicSource(pkgName);
if (source != null)
// must return the result of the dynamic import and do not continue
return source.getResource(name);
}
if (result == null)
try {
result = (URL) searchHooks(name, POST_RESOURCE);
} catch (FileNotFoundException e) {
return null;
} catch (ClassNotFoundException e) {
// will not happen
}
// do buddy policy loading
if (result == null && policy != null) result = policy.doBuddyResourceLoading(name);
if (result != null) return result;
// hack to support backwards compatibiility for bootdelegation
// or last resort; do class context trick to work around VM bugs
if (parentCL != null
&& !bootDelegation
&& ((checkParent && bundle.getFramework().compatibiltyBootDelegation) || isRequestFromVM()))
// we don't need to continue if the resource is not found here
return parentCL.getResource(name);
return result;
}
private Class findClassInternal(String name, boolean checkParent, ClassLoader parentCL)
throws ClassNotFoundException {
if (Debug.DEBUG && Debug.DEBUG_LOADER)
Debug.println(
"BundleLoader["
+ this
+ "].loadBundleClass("
+ name
+ ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
String pkgName = getPackageName(name);
boolean bootDelegation = false;
// follow the OSGi delegation model
if (checkParent && parentCL != null && bundle.getFramework().isBootDelegationPackage(pkgName))
// 2) if part of the bootdelegation list then delegate to parent and continue of failure
try {
return parentCL.loadClass(name);
} catch (ClassNotFoundException cnfe) {
// we want to continue
bootDelegation = true;
}
Class result = null;
try {
result = (Class) searchHooks(name, PRE_CLASS);
} catch (ClassNotFoundException e) {
throw e;
} catch (FileNotFoundException e) {
// will not happen
}
if (result != null) return result;
// 3) search the imported packages
PackageSource source = findImportedSource(pkgName, null);
if (source != null) {
// 3) found import source terminate search at the source
result = source.loadClass(name);
if (result != null) return result;
throw new ClassNotFoundException(name);
}
// 4) search the required bundles
source = findRequiredSource(pkgName, null);
if (source != null)
// 4) attempt to load from source but continue on failure
result = source.loadClass(name);
// 5) search the local bundle
if (result == null) result = findLocalClass(name);
if (result != null) return result;
// 6) attempt to find a dynamic import source; only do this if a required source was not found
if (source == null) {
source = findDynamicSource(pkgName);
if (source != null) {
result = source.loadClass(name);
if (result != null) return result;
// must throw CNFE if dynamic import source does not have the class
throw new ClassNotFoundException(name);
}
}
if (result == null)
try {
result = (Class) searchHooks(name, POST_CLASS);
} catch (ClassNotFoundException e) {
throw e;
} catch (FileNotFoundException e) {
// will not happen
}
// do buddy policy loading
if (result == null && policy != null) result = policy.doBuddyClassLoading(name);
if (result != null) return result;
// hack to support backwards compatibiility for bootdelegation
// or last resort; do class context trick to work around VM bugs
if (parentCL != null
&& !bootDelegation
&& ((checkParent && bundle.getFramework().compatibiltyBootDelegation) || isRequestFromVM()))
// we don't need to continue if a CNFE is thrown here.
try {
return parentCL.loadClass(name);
} catch (ClassNotFoundException e) {
// we want to generate our own exception below
}
throw new ClassNotFoundException(name);
}
