Bug 600819

Description of problem:
When setting scheduler parameter using the Java bindings, the incorrect value is passed to the native API.

Version-Release number of selected component (if applicable):
libvirt-java-0.4.5

How reproducible:
SchedUintParameter weight = new SchedUintParameter();
weight.field = "weight";
weight.value = 100;
SchedParameter[] parametersToSet = new SchedParameter[1];
parametersToSet[0] = weight;
domain.setSchedulerParameters(parametersToSet);

Steps to Reproduce:
Execute the above code using the XEN driver. XEN will complain that the weight is 0 and should be in the range 1-65535.
  
Actual results:
Sets weight = 100.

Expected results:
Tries to set weight = 0.

Additional info:
You have to tell JNA which field of the Union virSchedParameterValue you want to be written to native memory. For instance, when you want to write the field value.i, you have to invoke value.setType(int.class). As you can see the field is specified by type, therefore you cannot distinguish between the fields i and ui, which have the same Java type. This is the fix to include in the SchedParameter class:
switch (param.getType()) {
        case (1):
        returnValue.value.i = ((SchedIntParameter) param).value;
	// need to set the field
	returnValue.value.setType(int.class);
        break;
        case (2):
	// first int field is wrote to native memory therefore set i instead of ui
        returnValue.value.i = ((SchedUintParameter) param).value;
	// need to set the field
	returnValue.value.setType(int.class);
        break;
        case (3):
        returnValue.value.l = ((SchedLongParameter) param).value;
	// need to set the field
	returnValue.value.setType(long.class);
        break;
        case (4):
	// first long field is wrote to native memory, therefore set l instead of ul
        returnValue.value.l = ((SchedUlongParameter) param).value;
	// need to set the field
	returnValue.value.setType(long.class);
        break;
        case (5):
        returnValue.value.d = ((SchedDoubleParameter) param).value;
	// need to set the field
	returnValue.value.setType(double.class);
        break;
        case (6):
        returnValue.value.b = (byte) (((SchedBooleanParameter) param).value ? 1 : 0);
	// need to set the field
	returnValue.value.setType(byte.class);
        break;
}