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/*******************************************************************************
* Copyright (c) 2018 Politecnico di Torino and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution, and is available at
* http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
package it.polito.verigraph.tosca.converter.grpc;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.JAXBException;
import com.fasterxml.jackson.core.JsonProcessingException;
import it.polito.tosca.jaxb.TNodeTemplate;
import it.polito.tosca.jaxb.TRelationshipTemplate;
import it.polito.tosca.jaxb.TServiceTemplate;
import it.polito.verigraph.exception.BadRequestException;
import it.polito.verigraph.exception.DataNotFoundException;
import it.polito.verigraph.grpc.NodeTemplateGrpc;
import it.polito.verigraph.grpc.NodeTemplateGrpc.Type;
import it.polito.verigraph.grpc.RelationshipTemplateGrpc;
import it.polito.verigraph.grpc.TopologyTemplateGrpc;
import it.polito.verigraph.grpc.ToscaConfigurationGrpc;
import it.polito.verigraph.tosca.MappingUtils;
import it.polito.verigraph.tosca.XmlParsingUtils;
public class XmlToGrpc {
/** Returns the (first) TopologyTemplate found in the TOSCA-compliant XML file */
public static TopologyTemplateGrpc obtainTopologyTemplateGrpc (String filepath)
throws IOException, JAXBException, DataNotFoundException, ClassCastException, BadRequestException{
List<TServiceTemplate> serviceTList = XmlParsingUtils.obtainServiceTemplates(filepath);
TServiceTemplate serviceTemplate = serviceTList.get(0); //obtain only the first ServiceTemplate of the TOSCA compliance file
//Retrieving of list of NodeTemplate and RelationshipTemplate
List<NodeTemplateGrpc> nodes = new ArrayList<NodeTemplateGrpc>();
List<RelationshipTemplateGrpc> relats = new ArrayList<RelationshipTemplateGrpc>();
List<TNodeTemplate> tNodes = XmlParsingUtils.obtainNodeTemplates(serviceTemplate);
for(TNodeTemplate nt : tNodes) {
for(NodeTemplateGrpc alreadyAddedNode : nodes)
if(alreadyAddedNode.getId().equals(nt.getId()))
throw new BadRequestException("The NodeTemplate ID must be unique.");
nodes.add(parseNodeTemplate(nt));
}
for(TRelationshipTemplate rt : XmlParsingUtils.obtainRelationshipTemplates(serviceTemplate)) {
if(!tNodes.contains(rt.getSourceElement().getRef()) || !tNodes.contains(rt.getTargetElement().getRef()))
throw new BadRequestException("Invalid references to a Node in a Relationship.");
if(rt.getSourceElement().getRef() == rt.getTargetElement().getRef())
throw new BadRequestException("Source and Target cannot be equal in a Relationship.");
relats.add(parseRelationshipTemplate(rt));
}
//Creating TopologyTemplateGrpc object to be sent to server
return TopologyTemplateGrpc.newBuilder()
.setId("0") //useless value since the server chooses the actual value for the GraphID
.addAllNodeTemplate(nodes)
.addAllRelationshipTemplate(relats)
.build();
}
/** Parsing method: TNodeTemplate(tosca) --> NodeTemplateGrpc */
private static NodeTemplateGrpc parseNodeTemplate(TNodeTemplate nodeTempl)
throws ClassCastException, NullPointerException {
Boolean isVerigraphCompl = true;
Type type;
//NodeTemplateGrpc building
NodeTemplateGrpc.Builder nodegrpc = NodeTemplateGrpc.newBuilder();
//ID cannot be null
try {
nodegrpc.setId(nodeTempl.getId());
} catch (NullPointerException ex) {
throw new NullPointerException("An ID must be specified for each Node");
}
//Name can be null
try {
nodegrpc.setName(nodeTempl.getName());
} catch (NullPointerException ex) {
nodegrpc.setName("");
}
//Type cannot be null but it can be invalid
try {
String typestring = nodeTempl.getType().getLocalPart().toLowerCase();
type = Type.valueOf(nodeTempl.getType().getLocalPart().toLowerCase().substring(0,typestring.length()-4));
} catch (IllegalArgumentException | NullPointerException ex) {
//in case the NodeTemplate is not TOSCA-Verigraph compliant, we assume it to be a fieldmodifier node
type = Type.fieldmodifier;
isVerigraphCompl = false;
}
nodegrpc.setType(type);
ToscaConfigurationGrpc.Builder grpcConfig;
if(isVerigraphCompl) {
it.polito.tosca.jaxb.Configuration nodeConfig = XmlParsingUtils.obtainConfiguration(nodeTempl);
grpcConfig = ToscaConfigurationGrpc.newBuilder();
//These fields are optional in TOSCA xml
try {
grpcConfig.setId(nodeConfig.getConfID());
} catch(NullPointerException ex) {
grpcConfig.setId(ToscaGrpcUtils.defaultConfID);
}
try {
grpcConfig.setDescription(nodeConfig.getConfDescr());
} catch(NullPointerException ex) {
grpcConfig.setDescription(ToscaGrpcUtils.defaultDescr);
}
try {;
grpcConfig.setConfiguration(MappingUtils.obtainStringConfiguration(nodeConfig));
} catch(NullPointerException | JsonProcessingException ex) {
grpcConfig.setConfiguration(ToscaGrpcUtils.defaultConfig);
}
}
else {
grpcConfig = ToscaConfigurationGrpc.newBuilder()
.setId(ToscaGrpcUtils.defaultConfID)
.setDescription(ToscaGrpcUtils.defaultDescr)
.setConfiguration(ToscaGrpcUtils.defaultConfig);
}
nodegrpc.setConfiguration(grpcConfig.build());
return nodegrpc.build();
}
/** Parsing method: TRelationshipTemplate(tosca) --> RelationshipTemplateGrpc */
private static RelationshipTemplateGrpc parseRelationshipTemplate(TRelationshipTemplate relatTempl)
throws ClassCastException{
String source, target;
//RelationshipTemplateGrpc building
RelationshipTemplateGrpc.Builder relatgrpc = RelationshipTemplateGrpc.newBuilder();
//ID and Name can be null
try {
relatgrpc.setId(relatTempl.getId());
} catch (NullPointerException ex) {}//Different Relationship with same ID are considered valid.
try {
relatgrpc.setName(relatTempl.getName());
} catch (NullPointerException ex) {}
//Source and Target values cannot be null
try {
TNodeTemplate sourceNode = (TNodeTemplate) relatTempl.getSourceElement().getRef();
TNodeTemplate targetNode = (TNodeTemplate) relatTempl.getTargetElement().getRef();
source = sourceNode.getId();
target = targetNode.getId();
} catch (NullPointerException ex) {
throw new NullPointerException("Invalid NodeTemplate reference in RelationshipTemplate with id:"
+ relatTempl.getId());
}
relatgrpc.setIdSourceNodeTemplate(source)
.setIdTargetNodeTemplate(target);
return relatgrpc.build();
}
}
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