#1 Variable propagation for base types

[Thomas Genssler]

Variable propagation along traversals does not work for
base types (see result of example APExample.ijp,
transformed file Car.java):

[...]

public void count(int c) {
c = 0;
this.chassis.count(c);
System.out.println("Number of axes: " + c);
}
[...]

Variable c is passed by value rather than by reference.
The System.out will always print '0'.

Possible solution:
Use wrapper objects (Integer etc.) for passing
variables of base types along traversals.

[Thomas Genssler]

Logged In: YES
user_id=466738

Workaround: Use path-global variables, such as:
traverse 'car' do
{
add method 'void count()' {
Integer c;
[...]

However, this also brings a problem: The generated code for
count() contains the following stmnt sequence:
java.util.Hashtable transport = new
java.util.Hashtable();
Integer c = null;
transport.put("c", c);
count(transport);

One is not allowed to put null values into a hashtable. The
generated code should rather look like:
java.util.Hashtable transport = new
java.util.Hashtable();
Integer c = new Integer(0);
transport.put("c", c);
count(transport);

This is another bug.

[Benedikt Schulz]

Logged In: YES
user_id=672918

Base-types like int, boolean, ... are transformed into
Class-types before they can be put into the container for
transportation.

However the necessary code for e.g. transforming an int into
an Integer (like described in the diploma thesis) is not
generated. The base-types are put into into the container
for transportation without this explicit type conversion.