Refactor class into new/different namespace?

Hello,
how can I refactor a class into a new namespace or, basically change the namespace? Note that I'm not talking about renaming a namespace.

Refactor form:
{code}
namespace foo;
class bar {
}
{code}
into
{code}
namespace what\ever;
class bar {
}
{code}

Note that my real usage deals with more complex hierarchies, etc.

With refactoring I mean:
- move file to a new location (directory)
- adjust all references

All I can find is rename classses and namespaces or move files; but e.g. moving files does not automatically adjust the namespace, etc.

My code is PSR-4 compliant.

thanks

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