/**
* Get all the packages currently known for the caller's {@code ClassLoader} instance. Those
* packages correspond to classes loaded via or accessible by name to that {@code ClassLoader}
* instance. If the caller's {@code ClassLoader} instance is the bootstrap {@code ClassLoader}
* instance, which may be represented by {@code null} in some implementations, only packages
* corresponding to classes loaded by the bootstrap {@code ClassLoader} instance will be returned.
*
* @return a new array of packages known to the callers {@code ClassLoader} instance. An zero
* length array is returned if none are known.
*/
public static Package[] getPackages() {
ClassLoader l = ClassLoader.getCallerClassLoader();
if (l != null) {
return l.getPackages();
} else {
return getSystemPackages();
}
}
/**
* Find a package by name in the callers {@code ClassLoader} instance. The callers {@code
* ClassLoader} instance is used to find the package instance corresponding to the named class. If
* the callers {@code ClassLoader} instance is null then the set of packages loaded by the system
* {@code ClassLoader} instance is searched to find the named package.
*
* <p>Packages have attributes for versions and specifications only if the class loader created
* the package instance with the appropriate attributes. Typically, those attributes are defined
* in the manifests that accompany the classes.
*
* @param name a package name, for example, java.lang.
* @return the package of the requested name. It may be null if no package information is
* available from the archive or codebase.
*/
public static Package getPackage(String name) {
ClassLoader l = ClassLoader.getCallerClassLoader();
if (l != null) {
return l.getPackage(name);
} else {
return getSystemPackage(name);
}
}