The document discusses code generation from an EMF model representation of a program. It describes generating Java classes for each entity with private fields, getters, and setters. It also discusses using Xtend templates to generate code for different languages like C++, Delphi, and Visual Basic by handling indentation smartly and allowing conditional statements and loops within template expressions.

1. Code generation
private field with getter and setterfield
via getters and settersassignment
print statement System.out.println



Java class (separate file)
for every entity
public classentity 
generated code

2. Code generation
“take” only entities from the input
resource contains EMF model
representation of the program
file path
file contents not needed – base type of hierarchy,
no specific features
not needed
compile – will be
invoked recursively

3. Xtend Multiline template expressions
// Visual Basic
Dim unit As String
// Delphi
unit:String;
// Delphi .NET
@unit:String;
// C++
// create 10 variables
// each with one tab indentation
String unit1;
String unit2;
String unit3;
...
{ and } can be omitted
if only template
expression in body
guillemets  Shift + Ctrl + < or > Alt + q or Q
conditional
IF … ELSE … ENDIF
loop
FOR … ENDFOR
any expression within
guillemets, including
method invocation

4. Code generator in Xtend
indentation handled in a
smart way by Xtend
private n;
public int getN() {
return n;
}
public void setN(int value) {
this.n = value;
}
Compiling entity

5. Code generator in Xtend
Stringtext 
intnumber 
booleantoggle 
Type names
selection will use runtime type of fieldType
polymorphic method overloading (dispatch methods)
FieldType
BasicType:
FieldType
EntityType:
FieldType

6. Code generator in Xtend Statements and expressions
integer value (converted to string)
string value in quotes
on  true
off  false