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from __future__ import absolute_import, division, print_function
from java import cast, dynamic_proxy, jarray, jfloat, jint
import traceback
from .test_utils import FilterWarningsCase
from com.chaquo.python import PyException, TestProxy as TP
class TestProxy(FilterWarningsCase):
from .test_utils import assertDir
def test_direct_inherit(self):
from java.lang import Object, Runnable
for base in [Object, Runnable]:
with self.assertRaisesRegexp(TypeError, "Java classes can only be inherited using "
"static_proxy or dynamic_proxy"):
class P(base):
def test_dynamic_errors(self):
from java.lang import Object, Runnable
with self.assertRaisesRegexp(TypeError, "'hello' is not a Java interface"):
class P1(dynamic_proxy("hello")):
with self.assertRaisesRegexp(TypeError,
"<class 'java.lang.Object'> is not a Java interface"):
class P2(dynamic_proxy(Object)):
with self.assertRaisesRegexp(TypeError, "<class 'chaquopy.test.test_proxy.P3'> "
"is not a Java interface"):
class P3(dynamic_proxy(Runnable)):
class P4(dynamic_proxy(P3)):
with self.assertRaisesRegexp(TypeError, "dynamic_proxy must be used first in class bases"):
class B(object):
class P5(B, dynamic_proxy(Runnable)):
with self.assertRaisesRegexp(TypeError,
"dynamic_proxy can only be used once in class bases"):
class P6(dynamic_proxy(Runnable), dynamic_proxy(Runnable)):
def test_basic(self):
class AddN(dynamic_proxy(TP.Adder)):
def __init__(self, n):
super(AddN, self).__init__()
self.n = n
def add(self, x):
return self.n + x
a2, a3 = AddN(2), AddN(3)
self.assertEqual(2, a2.n)
self.assertEqual(5, cast(TP.Adder, a2).add(3)) # cast() ensures the call goes through Java.
self.assertEqual(6, cast(TP.Adder, a3).add(3))
self.assertEqual(5, cast(TP.Adder, a2).add(3))
from .test_utils import Object_names
Proxy_names = Object_names | {"getInvocationHandler", "getProxyClass", "isProxyClass",
"h"} # reflect.Proxy instance field
Adder_names = Object_names | {"constant", "add"}
AddN_names = Proxy_names | Adder_names
self.assertDir(TP.Adder, Adder_names)
self.assertDir(AddN, AddN_names)
AddN_instance_names = AddN_names | {"n"} # Python instance field
self.assertDir(a2, AddN_instance_names) = 42
self.assertDir(a2, AddN_instance_names | {"foo"})
def test_multiple(self):
# These both implement the same interfaces, and will therefore be represented by the
# same Java class. Make sure they retain their Python types after a round trip through
# Java.
class Add1(dynamic_proxy(TP.Adder)):
def add(self, x):
return x + 1
class Add2(dynamic_proxy(TP.Adder)):
def add(self, x):
return x + 2
TP.a1 = Add1()
TP.a2 = Add2()
self.assertEqual(11, TP.a1.add(10))
self.assertEqual(12, TP.a2.add(10))
def test_gc(self):
from .pyobjecttest import DelTrigger as DT
test = self
class A(dynamic_proxy(TP.Adder)):
def __init__(self, n):
self.before_init_n = n
test.assertEqual(n, self.before_init_n)
super(A, self).__init__()
self.after_init_n = -n
self.dt = DT()
def add(self, x):
return self.before_init_n + x
a = A(5)
DT.assertTriggered(self, False)
TP.a1 = a
a = None
DT.assertTriggered(self, False)
a = TP.a1
self.assertIsInstance(a, A)
self.assertEqual(5, a.before_init_n)
self.assertEqual(-5, a.after_init_n)
self.assertEqual(7, cast(TP.Adder, a).add(2))
a_Adder = cast(TP.Adder, a)
self.assertNotIsInstance(a_Adder, A)
self.assertFalse(hasattr(a_Adder, "before_init_n"))
a = None
DT.assertTriggered(self, False)
a = cast(A, a_Adder)
self.assertIsInstance(a, A)
self.assertEqual(5, a.before_init_n)
a_Adder = None
TP.a1 = None
DT.assertTriggered(self, False)
a = None
DT.assertTriggered(self, True)
# Using Python attributes before calling __init__ is covered by test_gc; this test covers
# use as a Java object.
def test_use_before_init(self):
class A(dynamic_proxy(TP.Adder)):
def __init__(self):
a = A()
error = self.assertRaisesRegexp(AttributeError, "'A' object's superclass __init__ must be "
"called before using it as a Java object")
with error:
TP.a1 = a
with error:
with error:
cast(TP.Adder, a)
super(A, a).__init__()
TP.a1 = a
cast(TP.Adder, a)
def test_interface_constant(self):
class AddConstant(dynamic_proxy(TP.Adder)):
def add(self, x):
return x + self.constant
a = AddConstant()
self.assertEqual(123, a.constant)
self.assertEqual(123, AddConstant.constant)
self.assertEqual(125, a.add(2))
final = self.assertRaisesRegexp(AttributeError, "constant is a final field")
with final:
a.constant = 321
with final:
AddConstant.constant = 321
# We need a complete test of attribute behaviour because of our unusual __dict__ handling.
def test_attribute(self):
class AddCounter(dynamic_proxy(TP.Adder)):
count = 0
def add(self, x):
result = x + AddCounter.count
AddCounter.count += 1
return result
a = AddCounter()
self.assertEqual(0, AddCounter.count)
self.assertEqual(0, a.count)
with self.assertRaisesRegexp(AttributeError, "'AddCounter' object has no attribute 'n'"):
self.assertEqual(10, a.add(10))
self.assertEqual(21, a.add(20))
self.assertEqual(32, a.add(30))
self.assertEqual(3, AddCounter.count)
a.count = 9
self.assertEqual(9, a.count)
self.assertEqual(43, a.add(40))
self.assertEqual(4, AddCounter.count)
self.assertEqual(9, a.count)
# We need a complete test of attribute behaviour because of our unusual __dict__ handling.
def test_descriptor(self):
class Add(dynamic_proxy(TP.Adder)):
def non_data(cls):
return "classmethod"
def data(self):
return 42
a = Add()
self.assertEquals("classmethod", a.non_data())
a.non_data = lambda: "instance override"
self.assertEqual("instance override", a.non_data())
del a.non_data
self.assertEquals("classmethod", a.non_data())
with self.assertRaisesRegexp(AttributeError, "can't set attribute"): = 99
with self.assertRaisesRegexp(AttributeError, "can't delete attribute"):
def test_unimplemented(self):
class A(dynamic_proxy(TP.Adder)):
with self.assertRaisesRegexp(PyException, r"TestProxy\$Adder.add is abstract"):
cast(TP.Adder, A()).add(5)
def test_object_methods_unimplemented(self):
class Unimplemented(dynamic_proxy(TP.Adder)):
a1, a2 = Unimplemented(), Unimplemented()
ts = cast(TP.Adder, a1).toString()
self.assertRegexpMatches(ts, r"\$Proxy.*@")
self.assertEqual(ts, str(a1))
self.assertNotEqual(str(a1), str(a2))
self.assertTrue(a1 == a1)
self.assertFalse(a1 == a2)
self.assertNotEqual(a1.hashCode(), a2.hashCode())
self.assertNotEqual(hash(a1), hash(a2)) = 99
for name in ["toString", "equals", "hashCode"]:
with self.assertRaisesRegexp(AttributeError, name + " is not a field"):
setattr(a1, name, 99)
def test_object_methods_implemented(self):
from java.lang import Object
class Implemented(dynamic_proxy(TP.Adder)):
def toString(self):
return "Override " + Object.toString(self)
def hashCode(self):
return Object.hashCode(self) + 1
def equals(self, other):
return True
a1, a2 = Implemented(), Implemented()
ts = cast(TP.Adder, a1).toString()
self.assertRegexpMatches(ts, r"^Override .*\$Proxy.*@")
self.assertEqual(ts, str(a1))
self.assertNotEqual(str(a1), str(a2))
self.assertEqual(Object.hashCode(a1) + 1, a1.hashCode())
def test_object_methods_final(self):
from java.lang import IllegalMonitorStateException
class C(dynamic_proxy(TP.Adder)):
def wait(self):
return "Python override"
c = C()
self.assertEqual("Python override", c.wait())
with self.assertRaises(IllegalMonitorStateException):
cast(TP.Adder, c).wait()
def test_python_base(self):
class B(object):
def forty_two(self):
return 42
class C(dynamic_proxy(TP.Adder), B):
def add(self, x):
return x + self.forty_two()
self.assertEqual(47, cast(TP.Adder, C()).add(5))
def test_return(self):
from java.lang import Runnable, ClassCastException, NullPointerException
class C(dynamic_proxy(Runnable, TP.Adder, TP.GetString)):
def run(self):
return self.result # returns void
def add(self, x):
return self.result # returns int
def getString(self):
return self.result # returns String
c = C()
c_Runnable, c_Adder, c_GS = [cast(cls, c) for cls in [Runnable, TP.Adder, TP.GetString]]
c.result = None
with self.assertRaises(NullPointerException):
c.result = 42
with self.assertRaisesRegexp(ClassCastException, "Cannot convert int object to void"):
self.assertEqual(42, c_Adder.add(99))
with self.assertRaisesRegexp(ClassCastException, "Cannot convert int object to "
c.result = "hello"
with self.assertRaisesRegexp(ClassCastException, "Cannot convert str object to void"):
with self.assertRaisesRegexp(ClassCastException, "Cannot convert str object to "
self.assertEqual("hello", c_GS.getString())
def test_args(self):
from java.lang import String
test = self
class C(dynamic_proxy(TP.Args)):
def tooMany(self):
def tooFew(self, a):
def addDuck(self, a, b):
return a + b
def star(self, *args):
return ",".join(args)
def varargs(self, delim, args):
test.assertIsInstance(args, jarray(String))
return delim.join(args)
c = C()
c_Args = cast(TP.Args, c)
with self.assertRaisesRegexp(PyException, args_error(1, 2)):
with self.assertRaisesRegexp(PyException, args_error(2, 1)):
self.assertEqual(3, c_Args.addDuck(jint(1), jint(2)))
self.assertAlmostEqual(3.5, c_Args.addDuck(jfloat(1), jfloat(2.5)))
self.assertEqual("helloworld", c_Args.addDuck("hello", "world"))
self.assertEqual("hello,world","hello", "world"))
with self.assertRaisesRegexp(TypeError, "cannot be applied"):"hello", "world", "again")
self.assertEqual("hello,world,again","hello", "world", "again"))
with self.assertRaisesRegexp(TypeError, args_error(1, 0, varargs=True)):
self.assertEqual("", c_Args.varargs(":"))
self.assertEqual("hello", c_Args.varargs("|", "hello"))
self.assertEqual("hello|world", c_Args.varargs("|", "hello", "world"))
def test_exception(self):
from import FileNotFoundException, EOFException
from java.lang import RuntimeException
from java.lang.reflect import UndeclaredThrowableException
from com.chaquo.python import PyException
ref_line_no = traceback.extract_stack()[-1][1]
class E(dynamic_proxy(TP.Exceptions)):
def fnf(self):
raise E.exc_cls("fnf")
e_cast = cast(TP.Exceptions, E())
fnf_frames = [("<python>", "fnf", "", ref_line_no + 3),
("com.chaquo.python.PyObject", "callAttrThrows", None, None),
("com.chaquo.python.PyInvocationHandler", "invoke",
"", None)]
def assertFnfThrows(message, throw_cls, catch_cls=None, check_cause=False):
if catch_cls is None:
catch_cls = throw_cls
E.exc_cls = throw_cls
except catch_cls as e:
check_e = e.getCause() if check_cause else e
self.assertEqual(message, check_e.getMessage())
self.assertHasFrames(check_e, fnf_frames)
assertFnfThrows("fnf", FileNotFoundException) # Declared checked exception
assertFnfThrows("fnf", EOFException, # Undeclared checked exception
assertFnfThrows("fnf", RuntimeException) # Unchecked exception
assertFnfThrows("TypeError: fnf", TypeError, PyException) # Python exception
def test_exception_indirect(self):
from java.lang import Integer, NumberFormatException
ref_line = traceback.extract_stack()[-1][1] # Line number of THIS line.
class E(dynamic_proxy(TP.Exceptions)):
def parse(self, s):
return self.indirect_parse(s)
def indirect_parse(self, s):
return Integer.parseInt(s)
e_cast = cast(TP.Exceptions, E())
self.assertEqual(42, e_cast.parse("42"))
except NumberFormatException as e:
self.assertHasFrames(e, [("java.lang.Integer", "parseInt", None, None),
("<python>", "indirect_parse", "", ref_line + 5),
("<python>", "parse", "", ref_line + 3),
("com.chaquo.python.PyObject", "callAttrThrows", None, None)])
def assertHasFrames(self, e, frames):
i_frame = 0
for ste in e.getStackTrace():
cls_name, method_name, file_name, line_no = frames[i_frame]
if ste.getClassName() == cls_name and \
ste.getMethodName() == method_name and \
(file_name is None or ste.getFileName().endswith(file_name)) and \
(line_no is None or ste.getLineNumber() == line_no):
i_frame += 1
if i_frame == len(frames):
raise AssertionError("{} element {} not found in {}".format(frames, i_frame,
# Test a non-Chaquopy proxy class, implemented in Java in the conventional way.
def test_java_implemented(self):
p = TP.newProxy()
TP.javaRun = False
self.assertEqual(True, TP.javaRun)
self.assertEqual("tf", p.tooFew())
self.assertEqual(5, p.addDuck(2, 2))
self.assertEqual(4.5, p.addDuck(2, 1.5))
self.assertEqual("helloworldX", p.addDuck("hello", "world"))
from java.lang import RuntimeException
with self.assertRaisesRegexp(RuntimeException, "Not implemented: tooMany"):
def args_error(expected, given, varargs=False):
py2_error = (r"takes {} arguments? \({} given\)"
.format(("no" if expected == 0 else
"at least {}".format(expected) if varargs else
"exactly {}".format(expected)),
if given < expected:
py3_error = r"missing {} required positional arguments?".format(expected - given)
py3_error = (r"takes {} positional arguments? but {} (were|was) given"
.format(expected, given))
return r"{}|{}".format(py2_error, py3_error)