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Copy pathjava.py
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162 lines (149 loc) · 6.54 KB
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# Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# The Universal Permissive License (UPL), Version 1.0
#
# Subject to the condition set forth below, permission is hereby granted to any
# person obtaining a copy of this software, associated documentation and/or
# data (collectively the "Software"), free of charge and under any and all
# copyright rights in the Software, and any and all patent rights owned or
# freely licensable by each licensor hereunder covering either (i) the
# unmodified Software as contributed to or provided by such licensor, or (ii)
# the Larger Works (as defined below), to deal in both
#
# (a) the Software, and
#
# (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
# one is included with the Software each a "Larger Work" to which the Software
# is contributed by such licensors),
#
# without restriction, including without limitation the rights to copy, create
# derivative works of, display, perform, and distribute the Software and make,
# use, sell, offer for sale, import, export, have made, and have sold the
# Software and the Larger Work(s), and to sublicense the foregoing rights on
# either these or other terms.
#
# This license is subject to the following condition:
#
# The above copyright notice and either this complete permission notice or at a
# minimum a reference to the UPL must be included in all copies or substantial
# portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
import _frozen_importlib
class JavaPackageLoader:
if sys.graal_python_jython_emulation_enabled:
@staticmethod
def is_java_package(name):
try:
package = type("java.lang.Package")
return any(p.getName().startswith(name) for p in package.getPackages())
except KeyError:
if sys.flags.verbose:
from _warnings import _warn
_warn("Host lookup allowed, but java.lang.Package not available. Importing from Java cannot work.")
return False
@staticmethod
def _make_getattr(modname):
modname = modname + "."
def __getattr__(key, default=None):
if sys.graal_python_host_import_enabled:
loadname = modname + key
if JavaPackageLoader.is_java_package(loadname):
return JavaPackageLoader._create_module(loadname)
else:
try:
return type(modname + key)
except KeyError:
# allow walking through not-yet-classloaded packages
return JavaPackageLoader._create_module(loadname)
raise AttributeError(key)
return __getattr__
else:
@staticmethod
def _make_getattr(modname):
if modname.startswith("java."):
modname_wo = modname[len("java."):] + "."
else:
modname_wo = None
modname = modname + "."
def __getattr__(key, default=None):
try:
return type(modname + key)
except KeyError:
pass
if modname_wo:
try:
return type(modname_wo + key)
except KeyError:
pass
raise AttributeError(key)
return __getattr__
@staticmethod
def create_module(spec):
return JavaPackageLoader._create_module(spec.name)
@staticmethod
def _create_module(name):
newmod = _frozen_importlib._new_module(name)
newmod.__getattr__ = JavaPackageLoader._make_getattr(name)
newmod.__path__ = __path__
return newmod
@staticmethod
def exec_module(module):
pass
class JavaTypeLoader:
@staticmethod
def create_module(spec):
pass
if sys.graal_python_jython_emulation_enabled:
@staticmethod
def exec_module(module):
sys.modules[module.__name__] = type(module.__name__)
else:
@staticmethod
def exec_module(module):
try:
sys.modules[module.__name__] = type(module.__name__)
except KeyError:
if module.__name__.startswith("java."):
sys.modules[module.__name__] = type(module.__name__[len("java."):])
else:
raise
class JavaImportFinder:
if sys.graal_python_jython_emulation_enabled:
@staticmethod
def find_spec(fullname, path, target=None):
if JavaPackageLoader.is_java_package(fullname):
return _frozen_importlib.ModuleSpec(fullname, JavaPackageLoader, is_package=True)
elif path == __path__:
try:
# do not rely on name conventions. check if it's a type,
# otherwise treat it as a not-yet-classloaded package
type(fullname)
return _frozen_importlib.ModuleSpec(fullname, JavaTypeLoader, is_package=False)
except KeyError:
return _frozen_importlib.ModuleSpec(fullname, JavaPackageLoader, is_package=True)
else:
try:
type(fullname)
return _frozen_importlib.ModuleSpec(fullname, JavaTypeLoader, is_package=False)
except KeyError:
pass # when importing from the implicit top-level java module, we only allow types
else:
@staticmethod
def find_spec(fullname, path, target=None):
if path and path == __path__:
if fullname.rpartition('.')[2].islower():
return _frozen_importlib.ModuleSpec(fullname, JavaPackageLoader, is_package=True)
else:
return _frozen_importlib.ModuleSpec(fullname, JavaTypeLoader, is_package=False)
sys.meta_path.append(JavaImportFinder)
if sys.graal_python_jython_emulation_enabled:
__getattr__ = JavaPackageLoader._make_getattr("java")