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"""
Copyright 2006-2008 SpringSource (http://springsource.com), All Rights Reserved
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 re
import types
import inspect
import logging
from springpython.context import scope
from decorator import decorator, partial
from springpython.context import ApplicationContextAware
from springpython.factory import PythonObjectFactory
from springpython.factory import ReflectiveObjectFactory
from springpython.container import InvalidObjectScope
def get_string(value):
"""This function is used to parse text that could either be ASCII or unicode."""
try:
return str(value)
except UnicodeEncodeError:
return unicode(value)
class ObjectDef(object):
"""
ObjectDef is a format-neutral way of storing object definition information. It includes
a handle for the actual ObjectFactory that should be used to utilize this information when
creating an instance of a object.
"""
def __init__(self, id, props=None, factory=None, scope=scope.SINGLETON,
lazy_init=False, abstract=False, parent=None):
super(ObjectDef, self).__init__()
self.id = id
self.factory = factory
if props is None:
self.props = []
else:
self.props = props
self.scope = scope
self.lazy_init = lazy_init
self.abstract = abstract
self.parent = parent
self.pos_constr = []
self.named_constr = {}
def __str__(self):
return "id=%s props=%s scope=%s factory=%s" % (self.id, self.props, self.scope, self.factory)
class ReferenceDef(object):
"""
This class represents a definition that is referencing another object.
"""
def __init__(self, name, ref):
self.name = name
self.ref = ref
def prefetch(self, container):
self.get_value(container)
def get_value(self, container):
return container.get_object(self.ref)
def set_value(self, obj, container):
setattr(obj, self.name, container.objects[self.ref])
def __str__(self):
return "name=%s ref=%s" % (self.name, self.ref)
class InnerObjectDef(object):
"""
This class represents an inner object. It is optional whether or not the object
has its own name.
"""
def __init__(self, name, inner_comp):
self.name = name
self.inner_comp = inner_comp
def prefetch(self, container):
self.get_value(container)
def get_value(self, container):
return container.get_object(self.inner_comp.id)
def set_value(self, obj, container):
setattr(obj, self.name, self.get_value(container))
def __str__(self):
return "name=%s inner_comp=%s" % (self.name, self.inner_comp)
class ValueDef(object):
"""
This class represents a property that holds a value. The value can be simple value, or
it can be a complex container which internally holds references, inner objects, or
any other type.
"""
def __init__(self, name, value):
self.name = name
if value == "True":
self.value = True
elif value == "False":
self.value= False
else:
self.value = value
self.logger = logging.getLogger("springpython.config.ValueDef")
def scan_value(self, container, value):
if hasattr(value, "get_value"):
return value.get_value(container)
elif isinstance(value, tuple):
new_list = [self.scan_value(container, item) for item in value]
results = tuple(new_list)
return results
elif isinstance(value, list):
new_list = [self.scan_value(container, item) for item in value]
return new_list
elif isinstance(value, set):
results = set([self.scan_value(container, item) for item in value])
return results
elif isinstance(value, frozenset):
results = frozenset([self.scan_value(container, item) for item in value])
return results
else:
if value == "True":
return True
elif value == "False":
return False
else:
return value
def get_value(self, container):
val = self._replace_refs_with_actuals(self.value, container)
if val is None:
return self.value
else:
return val
def set_value(self, obj, container):
setattr(obj, self.name, self.value)
val = self._replace_refs_with_actuals(obj, container)
def _replace_refs_with_actuals(self, obj, container):
"""Normal values do nothing for this step. However, sub-classes are defined for
the various containers, like lists, set, dictionaries, etc., to handle iterating
through and pre-fetching items."""
pass
def __str__(self):
return "name=%s value=%s" % (self.name, self.value)
class DictDef(ValueDef):
"""Handles behavior for a dictionary-based value."""
def __init__(self, name, value):
super(DictDef, self).__init__(name, value)
def _replace_refs_with_actuals(self, obj, container):
for key in self.value.keys():
if hasattr(self.value[key], "ref"):
self.value[key] = container.get_object(self.value[key].ref)
else:
self.value[key] = self.scan_value(container, self.value[key])
class ListDef(ValueDef):
"""Handles behavior for a list-based value."""
def __init__(self, name, value):
super(ListDef, self).__init__(name, value)
self.logger = logging.getLogger("springpython.config.ListDef")
def _replace_refs_with_actuals(self, obj, container):
for i in range(0, len(self.value)):
self.logger.debug("Checking out %s, wondering if I need to do any replacement..." % get_string(self.value[i]))
if hasattr(self.value[i], "ref"):
self.value[i] = container.get_object(self.value[i].ref)
else:
self.value[i] = self.scan_value(container, self.value[i])
class TupleDef(ValueDef):
"""Handles behavior for a tuple-based value."""
def __init__(self, name, value):
super(TupleDef, self).__init__(name, value)
def _replace_refs_with_actuals(self, obj, container):
new_value = list(self.value)
for i in range(0, len(new_value)):
if hasattr(new_value[i], "ref"):
new_value[i] = container.get_object(new_value[i].ref)
else:
new_value[i] = self.scan_value(container, new_value[i])
try:
setattr(obj, self.name, tuple(new_value))
except AttributeError:
pass
return tuple(new_value)
class SetDef(ValueDef):
"""Handles behavior for a set-based value."""
def __init__(self, name, value):
super(SetDef, self).__init__(name, value)
self.logger = logging.getLogger("springpython.config.SetDef")
def _replace_refs_with_actuals(self, obj, container):
self.logger.debug("Replacing refs with actuals...")
self.logger.debug("set before changes = %s" % self.value)
new_set = set()
for item in self.value:
if hasattr(item, "ref"):
self.logger.debug("Item !!!%s!!! is a ref, trying to replace with actual object !!!%s!!!" % (item, item.ref))
#self.value.remove(item)
#self.value.add(container.get_object(item.ref))
newly_fetched_value = container.get_object(item.ref)
new_set.add(newly_fetched_value)
self.logger.debug("Item !!!%s!!! was removed, and newly fetched value !!!%s!!! was added." % (item, newly_fetched_value))
#new_set.add(container.get_object(item.ref))
else:
self.logger.debug("Item !!!%s!!! is NOT a ref, trying to replace with scanned value" % get_string(item))
#self.value.remove(item)
#self.value.add(self.scan_value(container, item))
newly_scanned_value = self.scan_value(container, item)
new_set.add(newly_scanned_value)
self.logger.debug("Item !!!%s!!! was removed, and newly scanned value !!!%s!!! was added." % (item, newly_scanned_value))
#new_set.add(self.scan_value(container, item))
#self.value = new_set
self.logger.debug("set after changes = %s" % new_set)
#return self.value
try:
setattr(obj, self.name, new_set)
except AttributeError:
pass
return new_set
class FrozenSetDef(ValueDef):
"""Handles behavior for a frozen-set-based value."""
def __init__(self, name, value):
super(FrozenSetDef, self).__init__(name, value)
self.logger = logging.getLogger("springpython.config.FrozenSetDef")
def _replace_refs_with_actuals(self, obj, container):
self.logger.debug("Replacing refs with actuals...")
self.logger.debug("set before changes = %s" % self.value)
new_set = set()
for item in self.value:
if hasattr(item, "ref"):
self.logger.debug("Item <<<%s>>> is a ref, trying to replace with actual object <<<%s>>>" % (item, item.ref))
#new_set.remove(item)
#debug begin
newly_fetched_value = container.get_object(item.ref)
new_set.add(newly_fetched_value)
self.logger.debug("Item <<<%s>>> was removed, and newly fetched value <<<%s>>> was added." % (item, newly_fetched_value))
#debug end
#new_set.add(container.get_object(item.ref))
else:
self.logger.debug("Item <<<%s>>> is NOT a ref, trying to replace with scanned value" % get_string(item))
#new_set.remove(item)
#debug begin
newly_scanned_value = self.scan_value(container, item)
new_set.add(newly_scanned_value)
self.logger.debug("Item <<<%s>>> was removed, and newly scanned value <<<%s>>> was added." % (item, newly_scanned_value))
#debug end
#new_set.add(self.scan_value(container, item))
#self.logger.debug("Newly built set = %s" % new_set)
#self.value = frozenset(new_set)
new_frozen_set = frozenset(new_set)
self.logger.debug("set after changes = %s" % new_frozen_set)
#return self.value
try:
setattr(obj, self.name, new_frozen_set)
except AttributeError:
pass
except TypeError:
pass
return new_frozen_set
class Config(object):
"""
Config is an interface that defines how to read object definitions from an input source.
"""
def read_object_defs(self):
"""Abstract method definition - should return an array of Object objects"""
raise NotImplementedError()