Class findClass(String name, boolean checkParent) throws ClassNotFoundException {
ClassLoader parentCL = getParentClassLoader();
if (checkParent && parentCL != null && name.startsWith(JAVA_PACKAGE))
// 1) if startsWith "java." delegate to parent and terminate search
// we want to throw ClassNotFoundExceptions if a java.* class cannot be loaded from the
// parent.
return parentCL.loadClass(name);
try {
if (USE_GLOBAL_DEADLOCK_AVOIDANCE_LOCK) lock(createClassLoader());
return findClassInternal(name, checkParent, parentCL);
} finally {
if (USE_GLOBAL_DEADLOCK_AVOIDANCE_LOCK) unlock();
}
}
/*
* This method is used by Bundle.getResources to do proper parent delegation.
*/
public Enumeration getResources(String name) throws IOException {
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);
// follow the OSGi delegation model
// First check the parent classloader for system resources, if it is a java resource.
Enumeration result = null;
if (pkgName.startsWith(JAVA_PACKAGE)
|| bundle.getFramework().isBootDelegationPackage(pkgName)) {
// 1) if startsWith "java." delegate to parent and terminate search
// 2) if part of the bootdelegation list then delegate to parent and continue of failure
ClassLoader parentCL = getParentClassLoader();
result = parentCL == null ? null : parentCL.getResources(name);
if (pkgName.startsWith(JAVA_PACKAGE)) return result;
}
return compoundEnumerations(result, findResources(name));
}
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);
}
