public void Token( string token, QueryTranslator q )
{
// start by looking for HQL keywords....
string lcToken = token.ToLower( System.Globalization.CultureInfo.InvariantCulture );
if( lcToken.Equals( StringHelper.Comma ) )
{
if( !( expectingJoin | expectingAs ) )
{
throw new QueryException( "unexpected token: ," );
}
expectingJoin = false;
expectingAs = false;
}
else if( lcToken.Equals( "join" ) )
{
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( lcToken.Equals( "fetch" ) )
{
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( lcToken.Equals( "outer" ) )
{
// 'outer' is optional and is ignored)
if( !afterJoinType || ( joinType != JoinType.LeftOuterJoin && joinType != JoinType.RightOuterJoin ) )
{
throw new QueryException( "unexpected token: outer" );
}
}
else if( joinTypes.Contains( lcToken ) )
{
if( !( expectingJoin | expectingAs ) )
{
throw new QueryException( "unexpected token: " + token );
}
joinType = ( JoinType ) joinTypes[ lcToken ];
afterJoinType = true;
expectingJoin = false;
expectingAs = false;
}
else if( lcToken.Equals( "class" ) )
{
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( lcToken.Equals( "in" ) )
{
if( !expectingIn )
{
throw new QueryException( "unexpected token: in" );
}
afterIn = true;
expectingIn = false;
}
else if( lcToken.Equals( "as" ) )
{
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 consistentcy 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.MappedClass );
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;
}
}
}
}