Exemple #1
0
        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;
                    }
                }
            }
        }