def processAlgorithm(self, key, progress):
# Create a GFP for execution with SNAP's GPT
graph = ET.Element("graph", {'id':self.operator+'_gpf'})
version = ET.SubElement(graph, "version")
version.text = "1.0"
# Add node with this algorithm's operator
graph = self.addGPFNode(graph)
# Add outputs as write nodes (except for Write operator)
if self.operator != "Write" and len(self.outputs) >= 1:
for output in self.outputs:
graph = self.addWriteNode(graph, output, key)
# Log the GPF
loglines = []
loglines.append("GPF Graph")
GPFUtils.indentXML(graph)
for line in ET.tostring(graph).splitlines():
loglines.append(line)
ProcessingLog.addToLog(ProcessingLog.LOG_INFO, loglines)
# Execute the GPF
GPFUtils.executeGpf(key, ET.tostring(graph), progress)
def toXml(self, forExecution=False):
graph = ET.Element("graph", {'id': "Graph"})
version = ET.SubElement(graph, "version")
version.text = "1.0"
# If the XML is made to be saved then set parameters and outputs.
# If it is made for execution then parameters and outputs are already set.
if not forExecution:
self.defineCharacteristics()
# Set the connections between nodes
for alg in self.algs.values():
for param in alg.params.values():
if isinstance(param, ValueFromOutput):
alg.algorithm.getParameterFromName(
"sourceProduct").setValue(
self.algs[param.alg].algorithm.nodeID)
# Save model algorithms
for alg in self.algs.values():
self.prepareAlgorithm(alg)
# Only Write operators can save raster outputs
for out in alg.algorithm.outputs:
if alg.algorithm.operator != "Write" and isinstance(
out, OutputRaster):
if out.name in alg.outputs:
QMessageBox.warning(
None, self.tr('Unable to save model'),
self.
tr('Output rasters can only be saved by Write operator. Remove the value of raster output in %s algorithm or add a Write operator'
% (alg.algorithm.operator, )))
return
graph = alg.algorithm.addGPFNode(graph)
# Save also the position and settings of model inputs.
# They are saved as attributes of relevant parameter XML nodes.
# This way they do not interfere with the model when it's opened
# in SNAP.
if alg.algorithm.operator != "Read":
for param in alg.params.keys():
paramValue = str(alg.params[param])
if paramValue in self.inputs.keys():
# Only Read operators can read raster inputs
if param == "sourceProduct":
QMessageBox.warning(
None, self.tr('Unable to save model'),
self.
tr('Input rasters can only be loaded by Read operator. Change the value of raster input in %s algorithm to an output of another algorithm'
% (alg.algorithm.operator, )))
return
paramTag = graph.find('node[@id="' +
alg.algorithm.nodeID +
'"]/parameters/' + param)
if paramTag is not None:
pos = self.inputs[paramValue].pos
paramTag.attrib["qgisModelInputPos"] = str(
pos.x()) + "," + str(pos.y())
paramTag.attrib["qgisModelInputVars"] = str(
self.inputs[paramValue].param.todict())
# Save model layout
presentation = ET.SubElement(graph, "applicationData", {
"id": "Presentation",
"name": self.name,
"group": self.group
})
ET.SubElement(presentation, "Description")
for alg in self.algs.values():
node = ET.SubElement(presentation, "node",
{"id": alg.algorithm.nodeID})
ET.SubElement(node, "displayPosition", {
"x": str(alg.pos.x()),
"y": str(alg.pos.y())
})
# Make it look nice in text file
GPFUtils.indentXML(graph)
return ET.tostring(graph)
