final int subs = field.getSelectSubclasses();
final Joins[] resJoins = new Joins[rels.length];
//cache union for field here
//select data for this sm
Union union = null;
SelectImpl sel = null;
List parmList = null;
if (!((JDBCStoreManager)store).isQuerySQLCacheOn())
union = newUnion(sm, store, fetch, rels, subs, resJoins);
else {
Map<JDBCStoreManager.SelectKey, Object[]> relationFieldUnionCache =
((JDBCStoreManager)store).getCacheMapFromQuerySQLCache(
RelationFieldStrategy.class);
boolean found = true;
JDBCFetchConfiguration fetchClone = new JDBCFetchConfigurationImpl();
fetchClone.copy(fetch);
JDBCStoreManager.SelectKey selKey =
new JDBCStoreManager.SelectKey(null, field, fetch);
Object[] obj = relationFieldUnionCache.get(selKey);
if (obj != null) {
union = (Union) obj[0];
resJoins[0] = (Joins)obj[1];
} else {
synchronized(relationFieldUnionCache) {
obj = relationFieldUnionCache.get(selKey);
if (obj != null) {
union = (Union) obj[0];
resJoins[0] = (Joins) obj[1];
} else {
// select related mapping columns; joining from the
// related type back to our fk table if not an inverse
// mapping (in which case we can just make sure the
// inverse cols == our pk values)
union = newUnion(sm, store, fetch, rels, subs,
resJoins);
found = false;
}
sel = ((LogicalUnion.UnionSelect)union.getSelects()[0]).
getDelegate();
SQLBuffer buf = sel.getSQL();
if (buf == null) {
((SelectImpl)sel).setSQL(store, fetch);
found = false;
}
// only cache the union when elems length is 1 for now
if (!found && rels.length == 1) {
Object[] obj1 = new Object[2];
obj1[0] = union;
obj1[1] = resJoins[0];
((JDBCStoreManager)store).addToSqlCache(
relationFieldUnionCache, selKey, obj1);
}
}
}
Log log = store.getConfiguration().
getLog(JDBCConfiguration.LOG_JDBC);
if (log.isTraceEnabled()){
if (found)
log.trace(_loc.get("cache-hit", field, this.getClass()));
else
log.trace(_loc.get("cache-missed", field, this.getClass()));
}
parmList = new ArrayList();
ClassMapping mapping = field.getDefiningMapping();
Object oid = sm.getObjectId();
Column[] cols = mapping.getPrimaryKeyColumns();
if (sel == null)
sel = ((LogicalUnion.UnionSelect)union.getSelects()[0]).
getDelegate();
sel.wherePrimaryKey(mapping, cols, cols, oid, store,
null, null, parmList);
}
Result res = union.execute(store, fetch, parmList);
try {
Object val = null;
if (res.next())
val = res.load(rels[res.indexOf()], store, fetch,
resJoins[res.indexOf()]);