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#*****************************************************************************
# Copyright 2004-2008 Steve Menard
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#*****************************************************************************
import _jpype
from . import _jclass
from ._pykeywords import KEYWORDS
_PROPERTY_ACCESSOR_PREFIX_LEN = 3
def _initialize() :
_jclass.registerClassCustomizer(PropertiesCustomizer())
def _extract_accessor_pairs(members):
"""Extract pairs of corresponding property access methods
(getter and setter) from a Java class's members (attributes).
If a public method with a property's name exists no pair for
that property will be extracted.
Returns a dictionary with the property name as key and a tuple
of (getter method, setter method) as value. A tuple element
value might be `None` if only a getter or only a setter
exists.
"""
accessor_pairs = {}
for name, member in members.items():
if not (len(name) > _PROPERTY_ACCESSOR_PREFIX_LEN \
and _is_java_method(member)):
continue
access, rest = ( name[:_PROPERTY_ACCESSOR_PREFIX_LEN],
name[_PROPERTY_ACCESSOR_PREFIX_LEN:] )
property_name = rest[:1].lower() + rest[1:]
if property_name in members:
if _is_java_method(members[property_name]):
continue
if access == 'get' and member.isBeanAccessor():
try:
pair = accessor_pairs[property_name]
pair[0] = member
except KeyError:
accessor_pairs[property_name] = [member, None]
elif access == 'set' and member.isBeanMutator():
try:
pair = accessor_pairs[property_name]
pair[1] = member
except KeyError:
accessor_pairs[property_name] = [None, member]
return accessor_pairs
def _is_java_method(attribute):
return isinstance(attribute, _jpype._JavaMethod)
class PropertiesCustomizer(object) :
def canCustomize(self, name, jc) :
return True
def customize(self, class_name, jc, bases, members) :
accessor_pairs = _extract_accessor_pairs(members)
for attr_name, (getter, setter) in accessor_pairs.items():
# class is will be static to match Type.class in Java
if attr_name=='class':
continue
# Handle keyword conflicts
if attr_name in KEYWORDS:
attr_name += "_"
if attr_name in members:
if not getter:
# add default getter if we
# only have a setter
getter = members[attr_name].fget
elif not setter:
# add default setter if we
# only have a getter
setter = members[attr_name].fset
members[attr_name] = property(getter, setter)
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