Thuban/Model/extension.py

# Copyright (c) 2001, 2002 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from messages import EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED

from base import TitledObject, Modifiable


class Extension(TitledObject, Modifiable):

    """Represent a extension. A extension is a package of additional
       functionality to Thuban and contains a number of Objects
           that can be freely defined in an extension.
           Each object must a a TitleObject with additional set "object.name".

    Extension objects send the following message types:

        EXTENSION_CHANGED -- Something in the extension has changed.

        EXTENSION_OBJECTS_CHANGED -- Something in the objects has changed.

    """

    forwarded_channels = (EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED)

    def __init__(self, title):
        """Initialize the extension."""
        TitledObject.__init__(self, title)
        self.objects = []

    def Destroy(self):
        for object in self.objects:
            object.Destroy()
        Modifiable.Destroy(self)

    def AddObject(self, object):
        self.objects.append(object)
        for channel in self.forwarded_channels:
            object.Subscribe(channel, self.forward, channel)
        self.changed(EXTENSION_OBJECTS_CHANGED, self)

    def RemoveObject(self, object):
        for channel in self.forwarded_channels:
            object.Unsubscribe(channel, self.forward, channel)
        self.layers.remove(layer)
        self.changed(EXTENSION_OBJECTS_CHANGED, self)
        object.Destroy()

    def Objects(self):
        return self.objects

    def HasObjects(self):
        return len(self.objects) > 0

    def FindObject(self, title):
        """Find an object by title. If found, return it, else return None."""
        for object in self.objects:
            if object.title == title:
                return object
        return None

    def forward(self, *args):
        """Reissue events"""
        if len(args) > 1:
            args = (args[-1],) + args[:-1]
        apply(self.issue, args)

    def WasModified(self):
        """Return true if something of the extension was modified"""
        if self.modified:
            return 1
        else:
            return 0

    def UnsetModified(self):
        """Unset the modified flag of the extension"""
        Modifiable.UnsetModified(self)
1	jan	195	# Copyright (c) 2001, 2002 by Intevation GmbH
2			# Authors:
3			# Jan-Oliver Wagner <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			__version__ = "$Revision$"
9
10			from messages import EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED
11
12			from base import TitledObject, Modifiable
13
14
15			class Extension(TitledObject, Modifiable):
16
17			"""Represent a extension. A extension is a package of additional
18			functionality to Thuban and contains a number of Objects
19			that can be freely defined in an extension.
20			Each object must a a TitleObject with additional set "object.name".
21
22			Extension objects send the following message types:
23
24			EXTENSION_CHANGED -- Something in the extension has changed.
25
26			EXTENSION_OBJECTS_CHANGED -- Something in the objects has changed.
27
28			"""
29
30			forwarded_channels = (EXTENSION_CHANGED, EXTENSION_OBJECTS_CHANGED)
31
32			def __init__(self, title):
33			"""Initialize the extension."""
34			TitledObject.__init__(self, title)
35			self.objects = []
36
37			def Destroy(self):
38			for object in self.objects:
39			object.Destroy()
40			Modifiable.Destroy(self)
41
42			def AddObject(self, object):
43			self.objects.append(object)
44			for channel in self.forwarded_channels:
45			object.Subscribe(channel, self.forward, channel)
46			self.changed(EXTENSION_OBJECTS_CHANGED, self)
47
48			def RemoveObject(self, object):
49			for channel in self.forwarded_channels:
50			object.Unsubscribe(channel, self.forward, channel)
51			self.layers.remove(layer)
52			self.changed(EXTENSION_OBJECTS_CHANGED, self)
53			object.Destroy()
54
55			def Objects(self):
56			return self.objects
57
58			def HasObjects(self):
59			return len(self.objects) > 0
60
61			def FindObject(self, title):
62			"""Find an object by title. If found, return it, else return None."""
63			for object in self.objects:
64			if object.title == title:
65			return object
66			return None
67
68			def forward(self, *args):
69			"""Reissue events"""
70			if len(args) > 1:
71			args = (args[-1],) + args[:-1]
72			apply(self.issue, args)
73
74			def WasModified(self):
75			"""Return true if something of the extension was modified"""
76			if self.modified:
77			return 1
78			else:
79			return 0
80
81			def UnsetModified(self):
82			"""Unset the modified flag of the extension"""
83			Modifiable.UnsetModified(self)
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