public override void Emit(SourceBuilder sourceCode)
{
// emit initialization with element mapped from storage
string variableContainingStorage = NamesOfEntities.Variable(StorageName);
string variableContainingSourceElement = NamesOfEntities.CandidateVariable(SourcePatternElementName);
string tempVariableForMapResult = NamesOfEntities.MapWithStorageTemporary(PatternElementName);
sourceCode.AppendFrontFormat("if(!{0}.TryGetValue(({1}){2}, out {3})) ",
variableContainingStorage, StorageKeyTypeName,
variableContainingSourceElement, tempVariableForMapResult);
// emit check failed code
sourceCode.Append("{\n");
sourceCode.Indent();
CheckFailedOperations.Emit(sourceCode);
sourceCode.Unindent();
sourceCode.AppendFront("}\n");
// assign the value to the candidate variable, cast it to the variable type
string typeOfVariableContainingCandidate = "GRGEN_LGSP."
+ (IsNode ? "LGSPNode" : "LGSPEdge");
string variableContainingCandidate = NamesOfEntities.CandidateVariable(PatternElementName);
sourceCode.AppendFrontFormat("{0} = ({1}){2};\n",
variableContainingCandidate, typeOfVariableContainingCandidate, tempVariableForMapResult);
}
