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;
}
