At Thursday 7/12/2006 05:28, Nathan Harmston wrote:
chr1 SGD gene 5 8 id=1 name=3 dbref=6
chr1 SGD intron 5 6 id=5 notes="spam"
chr1 SGD exon 7 8 id=5
so I was thinking of having a factory class to return the individual
objects for each row......ie
class Factory():
# if passed a gene return a gene object
# if passed an intron return an intron object
# if passed an exom return an exon object
Is this a good way of doing this, or is there a better way to do this
in Python, this is probably the way I d do it in Java.
The basic idea is the same, but instead of a long series of
if...elif...else you can use a central registry (a dictionary will
do) and dispatch on the name. Classes act as their own factories.
registry = {}
class Base(object):
kind = "Unknown"
register(Base)
class Gene(Base):
kind = "gene"
def __init__(self, *args, **kw): pass
register(Gene)
class Intron(Base):
kind = "intron"
def __init__(self, *args, **kw): pass
register(Intron)
def register(cls):
registry[cls.kind] = cls
def factory(kind, *args, **kw):
return registry[kind](*args, **kw)
If some arguments are always present, you can name them, you're not
limited to use the generic *args and **kw.
--
Gabriel Genellina
Softlab SRL
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