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python-patterns/composite.py at master · thujeevan/python-patterns · GitHub
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"""
A class which defines a composite object which can store
hieararchical dictionaries with names.
This class is same as a hiearchical dictionary, but it
provides methods to add/access/modify children by name,
like a Composite.
Created Anand B Pillai <abpillai@gmail.com>
"""
__author__
=
"Anand B Pillai"
__maintainer__
=
"Anand B Pillai"
__version__
=
"0.2"
def
normalize
(
val
):
""" Normalize a string so that it can be used as an attribute
to a Python object """
if
val
.
find
(
'-'
)
!=
-
1
:
val
=
val
.
replace
(
'-'
,
'_'
)
return
val
def
denormalize
(
val
):
""" De-normalize a string """
if
val
.
find
(
'_'
)
!=
-
1
:
val
=
val
.
replace
(
'_'
,
'-'
)
return
val
class
SpecialDict
(
dict
):
""" A dictionary type which allows direct attribute
access to its keys """
def
__getattr__
(
self
,
name
):
if
name
in
self
.
__dict__
:
return
self
.
__dict__
[
name
]
elif
name
in
self
:
return
self
.
get
(
name
)
else
:
# Check for denormalized name
name
=
denormalize
(
name
)
if
name
in
self
:
return
self
.
get
(
name
)
else
:
raise
AttributeError
(
'no attribute named %s'
%
name
)
def
__setattr__
(
self
,
name
,
value
):
if
name
in
self
.
__dict__
:
self
.
__dict__
[
name
]
=
value
elif
name
in
self
:
self
[
name
]
=
value
else
:
# Check for denormalized name
name2
=
denormalize
(
name
)
if
name2
in
self
:
self
[
name2
]
=
value
else
:
# New attribute
self
[
name
]
=
value
class
CompositeDict
(
SpecialDict
):
""" A class which works like a hierarchical dictionary.
This class is based on the Composite design-pattern """
ID
=
0
def
__init__
(
self
,
name
=
''
):
if
name
:
self
.
_name
=
name
else
:
self
.
_name
=
''
.
join
((
'id#'
,
str
(
self
.
__class__
.
ID
)))
self
.
__class__
.
ID
+=
1
self
.
_children
=
[]
# Link back to father
self
.
_father
=
None
self
[
self
.
_name
]
=
SpecialDict
()
def
__getattr__
(
self
,
name
):
if
name
in
self
.
__dict__
:
return
self
.
__dict__
[
name
]
elif
name
in
self
:
return
self
.
get
(
name
)
else
:
# Check for denormalized name
name
=
denormalize
(
name
)
if
name
in
self
:
return
self
.
get
(
name
)
else
:
# Look in children list
child
=
self
.
findChild
(
name
)
if
child
:
return
child
else
:
attr
=
getattr
(
self
[
self
.
_name
],
name
)
if
attr
:
return
attr
raise
AttributeError
(
'no attribute named %s'
%
name
)
def
isRoot
(
self
):
""" Return whether I am a root component or not """
# If I don't have a parent, I am root
return
not
self
.
_father
def
isLeaf
(
self
):
""" Return whether I am a leaf component or not """
# I am a leaf if I have no children
return
not
self
.
_children
def
getName
(
self
):
""" Return the name of this ConfigInfo object """
return
self
.
_name
def
getIndex
(
self
,
child
):
""" Return the index of the child ConfigInfo object 'child' """
if
child
in
self
.
_children
:
return
self
.
_children
.
index
(
child
)
else
:
return
-
1
def
getDict
(
self
):
""" Return the contained dictionary """
return
self
[
self
.
_name
]
def
getProperty
(
self
,
child
,
key
):
""" Return the value for the property for child
'child' with key 'key' """
# First get the child's dictionary
childDict
=
self
.
getInfoDict
(
child
)
if
childDict
:
return
childDict
.
get
(
key
,
None
)
def
setProperty
(
self
,
child
,
key
,
value
):
""" Set the value for the property 'key' for
the child 'child' to 'value' """
# First get the child's dictionary
childDict
=
self
.
getInfoDict
(
child
)
if
childDict
:
childDict
[
key
]
=
value
def
getChildren
(
self
):
""" Return the list of immediate children of this object """
return
self
.
_children
def
getAllChildren
(
self
):
""" Return the list of all children of this object """
l
=
[]
for
child
in
self
.
_children
:
l
.
append
(
child
)
l
.
extend
(
child
.
getAllChildren
())
return
l
def
getChild
(
self
,
name
):
""" Return the immediate child object with the given name """
for
child
in
self
.
_children
:
if
child
.
getName
()
==
name
:
return
child
def
findChild
(
self
,
name
):
""" Return the child with the given name from the tree """
# Note - this returns the first child of the given name
# any other children with similar names down the tree
# is not considered.
for
child
in
self
.
getAllChildren
():
if
child
.
getName
()
==
name
:
return
child
def
findChildren
(
self
,
name
):
""" Return a list of children with the given name from the tree """
# Note: this returns a list of all the children of a given
# name, irrespective of the depth of look-up.
children
=
[]
for
child
in
self
.
getAllChildren
():
if
child
.
getName
()
==
name
:
children
.
append
(
child
)
return
children
def
getPropertyDict
(
self
):
""" Return the property dictionary """
d
=
self
.
getChild
(
'__properties'
)
if
d
:
return
d
.
getDict
()
else
:
return
{}
def
getParent
(
self
):
""" Return the person who created me """
return
self
.
_father
def
__setChildDict
(
self
,
child
):
""" Private method to set the dictionary of the child
object 'child' in the internal dictionary """
d
=
self
[
self
.
_name
]
d
[
child
.
getName
()]
=
child
.
getDict
()
def
setParent
(
self
,
father
):
""" Set the parent object of myself """
# This should be ideally called only once
# by the father when creating the child :-)
# though it is possible to change parenthood
# when a new child is adopted in the place
# of an existing one - in that case the existing
# child is orphaned - see addChild and addChild2
# methods !
self
.
_father
=
father
def
setName
(
self
,
name
):
""" Set the name of this ConfigInfo object to 'name' """
self
.
_name
=
name
def
setDict
(
self
,
d
):
""" Set the contained dictionary """
self
[
self
.
_name
]
=
d
.
copy
()
def
setAttribute
(
self
,
name
,
value
):
""" Set a name value pair in the contained dictionary """
self
[
self
.
_name
][
name
]
=
value
def
getAttribute
(
self
,
name
):
""" Return value of an attribute from the contained dictionary """
return
self
[
self
.
_name
][
name
]
def
addChild
(
self
,
name
,
force
=
False
):
""" Add a new child 'child' with the name 'name'.
If the optional flag 'force' is set to True, the
child object is overwritten if it is already there.
This function returns the child object, whether
new or existing """
if
type
(
name
)
!=
str
:
raise
ValueError
(
'Argument should be a string!'
)
child
=
self
.
getChild
(
name
)
if
child
:
# print 'Child %s present!' % name
# Replace it if force==True
if
force
:
index
=
self
.
getIndex
(
child
)
if
index
!=
-
1
:
child
=
self
.
__class__
(
name
)
self
.
_children
[
index
]
=
child
child
.
setParent
(
self
)
self
.
__setChildDict
(
child
)
return
child
else
:
child
=
self
.
__class__
(
name
)
child
.
setParent
(
self
)
self
.
_children
.
append
(
child
)
self
.
__setChildDict
(
child
)
return
child
def
addChild2
(
self
,
child
):
""" Add the child object 'child'. If it is already present,
it is overwritten by default """
currChild
=
self
.
getChild
(
child
.
getName
())
if
currChild
:
index
=
self
.
getIndex
(
currChild
)
if
index
!=
-
1
:
self
.
_children
[
index
]
=
child
child
.
setParent
(
self
)
# Unset the existing child's parent
currChild
.
setParent
(
None
)
del
currChild
self
.
__setChildDict
(
child
)
else
:
child
.
setParent
(
self
)
self
.
_children
.
append
(
child
)
self
.
__setChildDict
(
child
)
if
__name__
==
"__main__"
:
window
=
CompositeDict
(
'Window'
)
frame
=
window
.
addChild
(
'Frame'
)
tfield
=
frame
.
addChild
(
'Text Field'
)
tfield
.
setAttribute
(
'size'
,
'20'
)
btn
=
frame
.
addChild
(
'Button1'
)
btn
.
setAttribute
(
'label'
,
'Submit'
)
btn
=
frame
.
addChild
(
'Button2'
)
btn
.
setAttribute
(
'label'
,
'Browse'
)
# print(window)
# print(window.Frame)
# print(window.Frame.Button1)
# print(window.Frame.Button2)
print
(
window
.
Frame
.
Button1
.
label
)
print
(
window
.
Frame
.
Button2
.
label
)
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