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"""
1:n and n:m relations in the data model are saved using a collection.
"""
import inspect
from zope import component
from event import AssociationChangeEvent
class CollectionError(Exception):
pass
class collection(object):
"""
Collection (set-like) for model elements' 1:n and n:m relationships.
"""
def __init__(self, property, object, type):
self.property = property
self.object = object
self.type = type
self.items = []
def __len__(self):
return len(self.items)
def __setitem__(self, key, value):
raise CollectionError, 'items should not be overwritten.'
def __delitem__(self, key):
self.remove(key)
def __getitem__(self, key):
return self.items.__getitem__(key)
def __getslice__(self, i, j):
return self.items.__getslice__(i, j)
def __setslice__(self, i, j, s):
raise CollectionError, 'items should not be overwritten.'
def __delslice__(self, i, j):
raise CollectionError, 'items should not be deleted this way.'
def __contains__(self, obj):
return self.items.__contains__(obj)
def __iter__(self):
return iter(self.items)
def __str__(self):
return str(self.items)
__repr__ = __str__
def __nonzero__(self):
return self.items!=[]
def append(self, value):
if isinstance(value, self.type):
self.property._set(self.object, value)
else:
raise CollectionError, 'Object is not of type %s' % self.type.__name__
def remove(self, value):
if value in self.items:
self.property.__delete__(self.object, value)
else:
raise AttributeError, '%s not in collection' % value
def index(self, key):
"""
Given an object, return the position of that object in the
collection.
"""
return self.items.index(key)
# OCL members (from SMW by Ivan Porres, http://www.abo.fi/~iporres/smw)
def size(self):
return len(self.items)
def includes(self,o):
return o in self.items
def excludes(self,o):
return not self.includes(o)
def count(self,o):
c=0
for x in self.items:
if x==o:
c=c+1
return c
def includesAll(self,c):
for o in c:
if o not in self.items:
return 0
return 1
def excludesAll(self,c):
for o in c:
if o in self.items:
return 0
return 1
def select(self,f):
result=list()
for v in self.items:
if f(v):
result.append(v)
return result
def reject(self,f):
result=list()
for v in self.items:
if not f(v):
result.append(v)
return result
def collect(self,f):
result=list()
for v in self.items:
result.append(f(v))
return result
def isEmpty(self):
return len(self.items)==0
def nonEmpty(self):
return not self.isEmpty()
def sum(self):
r=0
for o in self.items:
r=r+o
return o
def forAll(self,f):
if not self.items or not inspect.getargspec(f)[0]:
return True
nargs=len(inspect.getargspec(f)[0])
if inspect.getargspec(f)[3]:
nargs=nargs-len(inspect.getargspec(f)[3])
assert(nargs>0)
nitems=len(self.items)
index=[0]*nargs
while 1:
args=[]
for x in index:
args.append(self.items[x])
if not apply(f,args):
return False
c=len(index)-1
index[c]=index[c]+1
while index[c]==nitems:
index[c]=0
c=c-1
if c<0:
return True
else:
index[c]=index[c]+1
if index[c]==nitems-1:
c=c-1
return False
def exist(self,f):
if not self.items or not inspect.getargspec(f)[0]:
return False
nargs=len(inspect.getargspec(f)[0])
if inspect.getargspec(f)[3]:
nargs=nargs-len(inspect.getargspec(f)[3])
assert(nargs>0)
nitems=len(self.items)
index=[0]*nargs
while 1:
args=[]
for x in index:
args.append(self.items[x])
if apply(f,args):
return True
c=len(index)-1
index[c]=index[c]+1
while index[c]==nitems:
index[c]=0
c=c-1
if c<0:
return False
else:
index[c]=index[c]+1
if index[c]==nitems-1:
c=c-1
return False
def swap(self, item1, item2):
"""
Swap two elements. Return true if swap was successful.
"""
try:
i1 = self.items.index(item1)
i2 = self.items.index(item2)
self.items[i1], self.items[i2] = self.items[i2], self.items[i1]
# send a notification that this list has changed
component.handle(AssociationChangeEvent(self.object, self.property))
return True
except IndexError, ex:
return False
except ValueError, ex:
return False
# vi:sw=4:et
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