public string ContinueFromManyToMany(string clazz, string[] joinColumns, QueryTranslator q)
{
Start(q);
continuation = true;
currentName = q.CreateNameFor(clazz);
q.AddType(currentName, clazz);
IQueryable classPersister = q.GetPersister(clazz);
AddJoin(currentName, TypeFactory.ManyToOne(clazz), joinColumns);
currentPropertyMapping = classPersister;
return currentName;
}
/// <summary>
///
/// </summary>
/// <param name="propertyName"></param>
/// <param name="propertyType"></param>
/// <param name="q"></param>
/// <remarks>NOTE: we avoid joining to the next table if the named property is just the foreign key value</remarks>
private void DereferenceEntity(string propertyName, EntityType propertyType, QueryTranslator q)
{
//if its "id"
bool isIdShortcut = EntityID.Equals(propertyName) && !propertyType.IsUniqueKeyReference;
//or its the id property name
string idPropertyName;
try
{
idPropertyName = propertyType.GetIdentifierOrUniqueKeyPropertyName(q.Factory);
}
catch (MappingException me)
{
throw new QueryException(me);
}
bool isNamedIdPropertyShortcut = idPropertyName != null && idPropertyName.Equals(propertyName);
if (isIdShortcut || isNamedIdPropertyShortcut)
{
// special shortcut for id properties, skip the join!
// this must only occur at the _end_ of a path expression
DereferenceProperty(propertyName);
}
else
{
string entityClass = propertyType.GetAssociatedEntityName();
string name = q.CreateNameFor(entityClass);
q.AddType(name, entityClass);
//String[] keyColNames = memberPersister.getIdentifierColumnNames();
AddJoin(name, propertyType);
if (propertyType.IsOneToOne)
{
oneToOneOwnerName = currentName;
}
else
{
oneToOneOwnerName = null;
}
ownerAssociationType = propertyType;
currentName = name;
currentProperty = propertyName;
q.AddPathAliasAndJoin(path.ToString(0, path.ToString().LastIndexOf(StringHelper.Dot)), name, joinSequence.Copy());
componentPath.Length = 0;
currentPropertyMapping = q.GetPersister(entityClass);
}
}
/// <summary>
///
/// </summary>
/// <param name="q"></param>
/// <returns></returns>
public string AddFromCollection(QueryTranslator q)
{
IType collectionElementType = PropertyType;
if (collectionElementType == null)
{
throw new QueryException(
string.Format("must specify 'elements' for collection valued property in from clause: {0}", path));
}
if (collectionElementType.IsEntityType)
{
// an association
IQueryableCollection collectionPersister = q.GetCollectionPersister(collectionRole);
IQueryable entityPersister = (IQueryable) collectionPersister.ElementPersister;
string clazz = entityPersister.EntityName;
string elementName;
if (collectionPersister.IsOneToMany)
{
elementName = collectionName;
// allow index() function
q.DecoratePropertyMapping(elementName, collectionPersister);
}
else
{
// many to many
q.AddCollection(collectionName, collectionRole);
elementName = q.CreateNameFor(clazz);
AddJoin(elementName, (IAssociationType) collectionElementType);
}
q.AddFrom(elementName, clazz, joinSequence);
currentPropertyMapping = new CollectionPropertyMapping(collectionPersister);
return elementName;
}
// collection of values
q.AddFromCollection(collectionName, collectionRole, joinSequence);
return collectionName;
}
public void Token(string token, QueryTranslator q)
{
// start by looking for HQL keywords....
string lcToken = token.ToLowerInvariant();
if (lcToken.Equals(StringHelper.Comma))
{
if (!(expectingJoin | expectingAs))
throw new QueryException("unexpected token: ,");
expectingJoin = false;
expectingAs = false;
}
else if ("join".Equals(lcToken))
{
if (!afterJoinType)
{
if (!(expectingJoin | expectingAs))
throw new QueryException("unexpected token: join");
// inner joins can be abbreviated to 'join'
joinType = JoinType.InnerJoin;
expectingJoin = false;
expectingAs = false;
}
else
{
afterJoinType = false;
}
}
else if ("fetch".Equals(lcToken))
{
if (q.IsShallowQuery)
throw new QueryException("fetch may not be used with scroll() or iterate()");
if (joinType == JoinType.None)
throw new QueryException("unexpected token: fetch");
if (joinType == JoinType.FullJoin || joinType == JoinType.RightOuterJoin)
throw new QueryException("fetch may only be used with inner join or left outer join");
afterFetch = true;
}
else if ("outer".Equals(lcToken))
{
// 'outer' is optional and is ignored)
if (!afterJoinType || (joinType != JoinType.LeftOuterJoin && joinType != JoinType.RightOuterJoin))
throw new QueryException("unexpected token: outer");
}
else if (joinTypes.ContainsKey(lcToken))
{
if (!(expectingJoin | expectingAs))
throw new QueryException("unexpected token: " + token);
joinType = joinTypes[lcToken];
afterJoinType = true;
expectingJoin = false;
expectingAs = false;
}
else if ("class".Equals(lcToken))
{
if (!afterIn)
throw new QueryException("unexpected token: class");
if (joinType != JoinType.None)
throw new QueryException("outer or full join must be followed by path expression");
afterClass = true;
}
else if ("in".Equals(lcToken))
{
if (!expectingIn)
throw new QueryException("unexpected token: in");
afterIn = true;
expectingIn = false;
}
else if ("as".Equals(lcToken))
{
if (!expectingAs)
throw new QueryException("unexpected token: as");
afterAs = true;
expectingAs = false;
}
else
{
if (afterJoinType)
throw new QueryException("join expected: " + token);
if (expectingJoin)
throw new QueryException("unexpected token: " + token);
if (expectingIn)
throw new QueryException("in expected: " + token);
// now anything that is not a HQL keyword
if (afterAs || expectingAs)
{
// (AS is always optional, for consistency with SQL/OQL
// process the "new" HQL stype where aliases are assigned
// _after_ the class name or path expression ie using the
// AS construction
if (entityName != null)
{
q.SetAliasName(token, entityName);
}
else
throw new QueryException("unexpected: as " + token);
afterAs = false;
expectingJoin = true;
expectingAs = false;
entityName = null;
}
else if (afterIn)
{
// process the "old" HQL style where aliases appear _first
// ie using the IN or IN CLASS constructions
if (alias == null)
throw new QueryException("alias not specified for: " + token);
if (joinType != JoinType.None)
throw new QueryException("outer or full join must be followed by path expressions");
if (afterClass)
{
// treat it as a classname
IQueryable p = q.GetPersisterUsingImports(token);
if (p == null)
{
throw new QueryException("persister not found: " + token);
}
q.AddFromClass(alias, p);
}
else
{
// treat it as a path expression
peParser.JoinType = JoinType.InnerJoin;
peParser.UseThetaStyleJoin = true;
ParserHelper.Parse(peParser, q.Unalias(token), ParserHelper.PathSeparators, q);
if (!peParser.IsCollectionValued)
{
throw new QueryException("pathe expression did not resolve to collection: " + token);
}
string nm = peParser.AddFromCollection(q);
q.SetAliasName(alias, nm);
}
alias = null;
afterIn = false;
afterClass = false;
expectingJoin = true;
}
else
{
// handle a path expression or class name that appears
// at the start, in the "new" HQL style or an alias that
// appears at the start in the "old HQL stype
IQueryable p = q.GetPersisterUsingImports(token);
if (p != null)
{
// starts with the name of a mapped class (new style)
if (joinType != JoinType.None)
throw new QueryException("outer or full join must be followed by path expression");
entityName = q.CreateNameFor(p.EntityName);
q.AddFromClass(entityName, p);
expectingAs = true;
}
else if (token.IndexOf('.') < 0)
{
// starts with an alias (old style)
// semi-bad thing about this: can't re-alias another alias...
alias = token;
expectingIn = true;
}
else
{
// starts with a path expression (new style)
// force HQL style: from Person p inner join p.cars c
//if (joinType==JoinType.None) throw new QueryException("path expression must be preceded by full, left, right or inner join");
//allow ODMG OQL style: from Person p, p.cars c
if (joinType != JoinType.None)
peParser.JoinType = joinType;
else
peParser.JoinType = JoinType.InnerJoin;
peParser.UseThetaStyleJoin = q.IsSubquery;
ParserHelper.Parse(peParser, q.Unalias(token), ParserHelper.PathSeparators, q);
entityName = peParser.AddFromAssociation(q);
joinType = JoinType.None;
peParser.JoinType = JoinType.InnerJoin;
if (afterFetch)
{
peParser.Fetch(q, entityName);
afterFetch = false;
}
expectingAs = true;
}
}
}
}
