/**
* Set the refs collection to the entity reference strings from the entities collection (and
* nothing more)
*
* @param refs The collection (String) of entity references to modify.
* @param entities The collection (Entity) of entity objects to use.
*/
public static void setEntityRefsFromEntities(Collection refs, Collection entities) {
refs.clear();
for (Iterator i = entities.iterator(); i.hasNext(); ) {
Entity entity = (Entity) i.next();
refs.add(entity.getReference());
}
}
/**
* Test a collection of Entity object for the specified entity reference
*
* @param entities The collection (Entity) of entities
* @param entityRef The string entity reference to find.
* @return true if found, false if not.
*/
public static boolean entityCollectionContainsRefString(Collection entities, String entityRef) {
for (Iterator i = entities.iterator(); i.hasNext(); ) {
Entity entity = (Entity) i.next();
if (entity.getReference().equals(entityRef)) return true;
}
return false;
}
/**
* Test a collection of Entity reference Strings for the specified Entity
*
* @param refs The collection (String) of entity refs
* @param entity The Entity to find.
* @return true if found, false if not.
*/
public static boolean refCollectionContainsEntity(Collection refs, Entity entity) {
String targetRef = entity.getReference();
for (Iterator i = refs.iterator(); i.hasNext(); ) {
String entityRef = (String) i.next();
if (entityRef.equals(targetRef)) return true;
}
return false;
}
/**
* Fill in the two collections of Entity reference strings - those added in newEntities that were
* not in oldEntityRefs, and those removed, i.e. in oldEntityRefs not in newEntities.
*/
public static void computeAddedRemovedEntityRefsFromNewEntitiesOldRefs(
Collection addedEntities,
Collection removedEntities,
Collection newEntities,
Collection oldEntityRefs) {
// added
for (Iterator i = newEntities.iterator(); i.hasNext(); ) {
Entity entity = (Entity) i.next();
if (!refCollectionContainsEntity(oldEntityRefs, entity)) {
addedEntities.add(entity.getReference());
}
}
// removed
for (Iterator i = oldEntityRefs.iterator(); i.hasNext(); ) {
String entityRef = (String) i.next();
if (!entityCollectionContainsRefString(newEntities, entityRef)) {
removedEntities.add(entityRef);
}
}
}