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#!/usr/bin/env python
# encoding: utf-8
"""
_VectorElement.py
This contains all the pure-python code for VectorElement.tmpl
Created by Graham Dennis on 2007-10-17.
Copyright (c) 2007-2012, Graham Dennis
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
from xpdeint.ScriptElement import ScriptElement
from xpdeint.Geometry.FieldElement import FieldElement
from xpdeint.Vectors.VectorInitialisation import VectorInitialisation
from xpdeint.Function import Function
from xpdeint.Utilities import lazy_property
class _VectorElement (ScriptElement):
isComputed = False
isNoise = False
def __init__(self, *args, **KWs):
localKWs = self.extractLocalKWs(['name', 'field', 'initialBasis', 'type'], KWs)
field = localKWs['field']
self.name = localKWs['name']
self.field = field
if not 'parent' in KWs: KWs['parent'] = field
if KWs['parent'] is field:
field.managedVectors.add(self)
else:
field.temporaryVectors.add(self)
ScriptElement.__init__(self, *args, **KWs)
# Set default variables
self.components = []
self._needsInitialisation = True
self._integratingComponents = False
self.type = localKWs['type']
self.aliases = set()
self.basesNeeded = set()
self.initialBasis = None
if localKWs.get('initialBasis') is not None:
self.initialBasis = self.field.basisForBasis(localKWs['initialBasis'])
self.basesNeeded.add(self.initialBasis)
# Set default initialisation to be the zero initialisation template
self.initialiser = VectorInitialisation(*args, **KWs)
self.initialiser.vector = self
intialiseFunctionName = ''.join(['_', self.id, '_initialise'])
initialiseFunction = Function(name = intialiseFunctionName,
args = [],
implementation = self.initialiseFunctionContents,
description = 'initialisation for ' + self.description(),
predicate = lambda: self.needsInitialisation)
self.functions['initialise'] = initialiseFunction
basisTransformFunctionName = ''.join(['_', self.id, '_basis_transform'])
basisTransformFunction = Function(name = basisTransformFunctionName,
args = [('ptrdiff_t', 'new_basis')],
implementation = self.basisTransformFunctionContents,
predicate = lambda: self.needsTransforms)
self.functions['basisTransform'] = basisTransformFunction
@property
def dependencies(self):
try:
return self.initialiser.codeBlocks['initialisation'].dependencies
except (AttributeError, KeyError), err:
return []
@property
def needsTransforms(self):
return len(self.basesNeeded) > 1
def __hash__(self):
"""
Returns a hash of the vector element. This is used to ensure the ordering of vectors in sets remains the same between invocations.
"""
return hash(self.id)
@lazy_property
def id(self):
return ''.join([self.field.name, '_', self.name])
@property
def children(self):
children = super(_VectorElement, self).children
if self.initialiser:
children.append(self.initialiser)
return children
@lazy_property
def nComponents(self):
return len(self.components)
def _getNeedsInitialisation(self):
return self._needsInitialisation
def _setNeedsInitialisation(self, value):
self._needsInitialisation = value
if not value and self.initialiser:
self.initialiser.vector = None
self.initialiser.remove()
self.initialiser = None
# Create a property for the class with the above getter and setter methods
needsInitialisation = property(_getNeedsInitialisation, _setNeedsInitialisation)
del _getNeedsInitialisation, _setNeedsInitialisation
def _getIntegratingComponents(self):
return self._integratingComponents
def _setIntegratingComponents(self, value):
self._integratingComponents = value
# The computed vector only needs initialisation to zero if we are integrating.
self.needsInitialisation = value
integratingComponents = property(_getIntegratingComponents, _setIntegratingComponents)
del _getIntegratingComponents, _setIntegratingComponents
@lazy_property
def allocSize(self):
return '_' + self.id + '_alloc_size'
def sizeInBasis(self, basis):
return self.field.sizeInBasis(basis) + ' * _' + self.id + '_ncomponents'
def sizeInBasisInReals(self, basis):
if self.type == 'real':
return self.sizeInBasis(basis)
else:
return '2 * ' + self.sizeInBasis(basis)
def isTransformableTo(self, basis):
return basis in self.transformMap['bases']
def remove(self):
self.field.managedVectors.discard(self)
self.field.temporaryVectors.discard(self)
super(_VectorElement, self).remove()
@property
def primaryCodeBlock(self):
try:
return self.initialiser.codeBlocks['initialisation']
except (AttributeError, KeyError), err:
return None
def preflight(self):
super(_VectorElement, self).preflight()
codeBlock = self.primaryCodeBlock
if codeBlock:
loopingDimensionNames = set([dim.name for dim in self.field.dimensions])
for dependency in codeBlock.dependencies:
loopingDimensionNames.update([dim.name for dim in dependency.field.dimensions])
codeBlock.field = FieldElement.sortedFieldWithDimensionNames(loopingDimensionNames)
if codeBlock.dependenciesEntity and codeBlock.dependenciesEntity.xmlElement.hasAttribute('basis'):
dependenciesXMLElement = codeBlock.dependenciesEntity.xmlElement
codeBlock.basis = \
codeBlock.field.basisFromString(
dependenciesXMLElement.getAttribute('basis'),
xmlElement = dependenciesXMLElement
)
# Because we have modified the codeBlock's field, we may also need to modify its basis.
# We will take any missing elements from the new field's defaultCoordinateBasis
codeBlock.basis = codeBlock.field.completedBasisForBasis(codeBlock.basis, codeBlock.field.defaultCoordinateBasis)
self.initialBasis = self.field.basisForBasis(codeBlock.basis)
self.basesNeeded.add(self.initialBasis)
# Our components are constructed by an integral if the looping field doesn't have the same
# dimensions as the field to which the computed vector belongs.
if not codeBlock.field.isEquivalentToField(self.field):
self.integratingComponents = True
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