public StrategyCalculator(Set<Class<? extends ITransformationStep>> actualClasses) {
super();
this.actualClasses = actualClasses;
for (Class<? extends ITransformationStep> c : this.actualClasses) {
addRequiredStrategiesRecursively(c);
}
for (StrategyRequirementHolder h : holders.values()) {
for (Class<?> replacedClass : h.getReplacedStrategyClasses()) {
StrategyRequirementHolder holder = holders.get(replacedClass);
if (holder != null) {
// Replaced strategy may not have been selected in the transformation process
h.addReplaces(holder);
}
}
}
this.strategies = new HashMap<Class<?>, StepDependency.StrategyRequirement>();
for (Class<? extends ITransformationStep> c : this.actualClasses) {
for (StrategyRequirement sr : c.getAnnotation(StepDependency.class).strategyRequirement()) {
StrategyRequirement existing = strategies.get(sr.strategyContract());
if (existing == null || overrides(sr, existing)) {
strategies.put(sr.strategyContract(), sr);
}
}
}
}
private void addRequiredStrategiesRecursively(Class<? extends ITransformationStep> c) {
StepDependency sd = c.getAnnotation(StepDependency.class);
for (StrategyRequirement sr : sd.strategyRequirement()) {
holders.put(sr.requires(), new StrategyRequirementHolder(sr));
}
for (Class<? extends ITransformationStep> replacedTransformation : sd.replaces()) {
addRequiredStrategiesRecursively(replacedTransformation);
}
}
private boolean overrides(StrategyRequirement sr, StrategyRequirement existing) {
return holders.get(sr.requires()).replaces(holders.get(existing.requires()));
}