/** Get the order by string required for collection fetching */
protected static final String orderBy(List associations) throws MappingException {
StringBuilder buf = new StringBuilder();
Iterator iter = associations.iterator();
OuterJoinableAssociation last = null;
while (iter.hasNext()) {
OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
if (oj.getJoinType() == JoinType.LEFT_OUTER_JOIN) { // why does this matter?
if (oj.getJoinable().isCollection()) {
final QueryableCollection queryableCollection = (QueryableCollection) oj.getJoinable();
if (queryableCollection.hasOrdering()) {
final String orderByString = queryableCollection.getSQLOrderByString(oj.getRHSAlias());
buf.append(orderByString).append(", ");
}
} else {
// it might still need to apply a collection ordering based on a
// many-to-many defined order-by...
if (last != null && last.getJoinable().isCollection()) {
final QueryableCollection queryableCollection =
(QueryableCollection) last.getJoinable();
if (queryableCollection.isManyToMany() && last.isManyToManyWith(oj)) {
if (queryableCollection.hasManyToManyOrdering()) {
final String orderByString =
queryableCollection.getManyToManyOrderByString(oj.getRHSAlias());
buf.append(orderByString).append(", ");
}
}
}
}
}
last = oj;
}
if (buf.length() > 0) buf.setLength(buf.length() - 2);
return buf.toString();
}
protected void initPersisters(
final List associations,
final LockOptions lockOptions,
final AssociationInitCallback callback)
throws MappingException {
final int joins = countEntityPersisters(associations);
final int collections = countCollectionPersisters(associations);
collectionOwners = collections == 0 ? null : new int[collections];
collectionPersisters = collections == 0 ? null : new CollectionPersister[collections];
collectionSuffixes = BasicLoader.generateSuffixes(joins + 1, collections);
this.lockOptions = lockOptions;
persisters = new Loadable[joins];
aliases = new String[joins];
owners = new int[joins];
ownerAssociationTypes = new EntityType[joins];
lockModeArray = ArrayHelper.fillArray(lockOptions.getLockMode(), joins);
int i = 0;
int j = 0;
Iterator iter = associations.iterator();
while (iter.hasNext()) {
final OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
if (!oj.isCollection()) {
persisters[i] = (Loadable) oj.getJoinable();
aliases[i] = oj.getRHSAlias();
owners[i] = oj.getOwner(associations);
ownerAssociationTypes[i] = (EntityType) oj.getJoinableType();
callback.associationProcessed(oj, i);
i++;
} else {
QueryableCollection collPersister = (QueryableCollection) oj.getJoinable();
if (oj.getJoinType() == JoinType.LEFT_OUTER_JOIN && !oj.hasRestriction()) {
// it must be a collection fetch
collectionPersisters[j] = collPersister;
collectionOwners[j] = oj.getOwner(associations);
j++;
}
if (collPersister.isOneToMany()) {
persisters[i] = (Loadable) collPersister.getElementPersister();
aliases[i] = oj.getRHSAlias();
callback.associationProcessed(oj, i);
i++;
}
}
}
if (ArrayHelper.isAllNegative(owners)) owners = null;
if (collectionOwners != null && ArrayHelper.isAllNegative(collectionOwners)) {
collectionOwners = null;
}
}
/**
* Count the number of instances of Joinable which are actually also instances of Loadable, or are
* one-to-many associations
*/
protected static final int countEntityPersisters(List associations) throws MappingException {
int result = 0;
Iterator iter = associations.iterator();
while (iter.hasNext()) {
OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
if (oj.getJoinable().consumesEntityAlias()) {
result++;
}
}
return result;
}
/** Generate a select list of columns containing all properties of the entity classes */
protected final String selectString(List associations) throws MappingException {
if (associations.size() == 0) {
return "";
} else {
StringBuilder buf = new StringBuilder(associations.size() * 100);
int entityAliasCount = 0;
int collectionAliasCount = 0;
for (int i = 0; i < associations.size(); i++) {
OuterJoinableAssociation join = (OuterJoinableAssociation) associations.get(i);
OuterJoinableAssociation next =
(i == associations.size() - 1)
? null
: (OuterJoinableAssociation) associations.get(i + 1);
final Joinable joinable = join.getJoinable();
final String entitySuffix =
(suffixes == null || entityAliasCount >= suffixes.length)
? null
: suffixes[entityAliasCount];
final String collectionSuffix =
(collectionSuffixes == null || collectionAliasCount >= collectionSuffixes.length)
? null
: collectionSuffixes[collectionAliasCount];
final String selectFragment =
joinable.selectFragment(
next == null ? null : next.getJoinable(),
next == null ? null : next.getRHSAlias(),
join.getRHSAlias(),
entitySuffix,
collectionSuffix,
join.getJoinType() == JoinType.LEFT_OUTER_JOIN);
if (selectFragment.trim().length() > 0) {
buf.append(", ").append(selectFragment);
}
if (joinable.consumesEntityAlias()) entityAliasCount++;
if (joinable.consumesCollectionAlias() && join.getJoinType() == JoinType.LEFT_OUTER_JOIN)
collectionAliasCount++;
}
return buf.toString();
}
}
/** Get the position of the join with the given alias in the list of joins */
private static int getPosition(String lhsAlias, List associations) {
int result = 0;
for (int i = 0; i < associations.size(); i++) {
OuterJoinableAssociation oj = (OuterJoinableAssociation) associations.get(i);
if (oj.getJoinable()
.consumesEntityAlias() /*|| oj.getJoinable().consumesCollectionAlias() */) {
if (oj.rhsAlias.equals(lhsAlias)) return result;
result++;
}
}
return -1;
}
/**
* Count the number of instances of Joinable which are actually also instances of
* PersistentCollection which are being fetched by outer join
*/
protected static final int countCollectionPersisters(List associations) throws MappingException {
int result = 0;
Iterator iter = associations.iterator();
while (iter.hasNext()) {
OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
if (oj.getJoinType() == JoinType.LEFT_OUTER_JOIN
&& oj.getJoinable().isCollection()
&& !oj.hasRestriction()) {
result++;
}
}
return result;
}
/** Generate a sequence of <tt>LEFT OUTER JOIN</tt> clauses for the given associations. */
protected final JoinFragment mergeOuterJoins(List associations) throws MappingException {
JoinFragment outerjoin = getDialect().createOuterJoinFragment();
Iterator iter = associations.iterator();
OuterJoinableAssociation last = null;
while (iter.hasNext()) {
OuterJoinableAssociation oj = (OuterJoinableAssociation) iter.next();
if (last != null && last.isManyToManyWith(oj)) {
oj.addManyToManyJoin(outerjoin, (QueryableCollection) last.getJoinable());
} else {
oj.addJoins(outerjoin);
}
last = oj;
}
last = null;
return outerjoin;
}