# *****************************************************************************
# * Copyright (c) 2011, 2013-2014 Wind River Systems, Inc. and others.
# * All rights reserved. This program and the accompanying materials
# * are made available under the terms of the Eclipse Public License v1.0
# * which accompanies this distribution, and is available at
# * http://www.eclipse.org/legal/epl-v10.html
# *
# * Contributors:
# * Wind River Systems - initial API and implementation
# *****************************************************************************
from .. import expressions
from ... import channel
from ...channel.Command import Command
class ExpressionsProxy(expressions.ExpressionsService):
def __init__(self, channel):
self.channel = channel
self.listeners = {}
def assign(self, contextID, value, done):
done = self._makeCallback(done)
service = self
value = bytearray(value)
class AssignCommand(Command):
def __init__(self):
super(AssignCommand, self).__init__(service.channel, service,
"assign",
(contextID, value))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneAssign(self.token, error)
return AssignCommand().token
def create(self, parent_id, language, expression, done):
done = self._makeCallback(done)
service = self
class CreateCommand(Command):
def __init__(self):
super(CreateCommand, self).__init__(service.channel, service,
"create",
(parent_id, language,
expression))
def done(self, error, args):
ctx = None
if not error:
assert len(args) == 2
error = self.toError(args[0])
if args[1]:
ctx = expressions.Expression(args[1])
done.doneCreate(self.token, error, ctx)
return CreateCommand().token
def dispose(self, contextID, done):
done = self._makeCallback(done)
service = self
class DisposeCommand(Command):
def __init__(self):
super(DisposeCommand, self).__init__(service.channel, service,
"dispose", (contextID,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneDispose(self.token, error)
return DisposeCommand().token
def evaluate(self, contextID, done):
done = self._makeCallback(done)
service = self
class EvalCommand(Command):
def __init__(self):
super(EvalCommand, self).__init__(service.channel, service,
"evaluate", (contextID,))
def done(self, error, args):
value = None
if not error:
assert len(args) == 3
value = channel.toByteArray(args[0])
error = self.toError(args[1])
props = args[2]
done.doneEvaluate(self.token, error,
expressions.Value(value, props))
return EvalCommand().token
def getChildren(self, parent_context_id, done):
done = self._makeCallback(done)
service = self
class GetChildrenCommand(Command):
def __init__(self):
super(GetChildrenCommand, self).__init__(service.channel,
service,
"getChildren",
(parent_context_id,))
def done(self, error, args):
contexts = None
if not error:
assert len(args) == 2
error = self.toError(args[0])
contexts = args[1]
done.doneGetChildren(self.token, error, contexts)
return GetChildrenCommand().token
def getContext(self, contextID, done):
done = self._makeCallback(done)
service = self
class GetContextCommand(Command):
def __init__(self):
super(GetContextCommand, self).__init__(service.channel,
service, "getContext",
(contextID,))
def done(self, error, args):
ctx = None
if not error:
assert len(args) == 2
error = self.toError(args[0])
if args[1]:
ctx = expressions.Expression(args[1])
done.doneGetContext(self.token, error, ctx)
return GetContextCommand().token
def addListener(self, listener):
l = ChannelEventListener(self, listener)
self.channel.addEventListener(self, l)
self.listeners[listener] = l
def removeListener(self, listener):
l = self.listeners.get(listener)
if l:
del self.listeners[listener]
self.channel.removeEventListener(self, l)
class ChannelEventListener(channel.EventListener):
def __init__(self, service, listener):
self.service = service
self.listener = listener
def event(self, name, data):
try:
args = channel.fromJSONSequence(data)
if name == "valueChanged":
assert len(args) == 1
self.listener.valueChanged(args[0])
else:
raise IOError("Expressions service: unknown event: " + name)
except Exception as x:
import sys
x.tb = sys.exc_info()[2]
self.service.channel.terminate(x)
