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Java > Open Source Codes > com > caucho > amber > query > CollectionSchemaExpr


1 /*
2  * Copyright (c) 1998-2004 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.amber.query;
30
31 import com.caucho.util.L10N;
32
33 /**
34  * Represents a collection from a from-item table.
35  */
36 public class CollectionSchemaExpr extends SchemaExpr {
37   private static final L10N L = new L10N(CollectionSchemaExpr.class);
38
39   private PathExpr _expr;
40   private String _name;
41
42   /**
43    * Creates the collection schema.
44    */
45   public CollectionSchemaExpr(PathExpr expr, String name)
46   {
47     _expr = expr;
48     _name = name;
49   }
50
51   /**
52    * Returns the tail name.
53    */
54   public String getTailName()
55   {
56     return _name;
57   }
58
59   /**
60    * Creates a field-based schema.
61    */
62   public SchemaExpr createField(QueryParser parser, String name)
63     throws QueryParseException
64   {
65     throw parser.error(L.l("collections in FROM may not be sub-collected."));
66   }
67
68   /**
69    * Adds the from item.
70    */
71   public FromItem addFromItem(QueryParser parser, String id)
72     throws QueryParseException
73   {
74     _expr = _expr.bindSelect(parser, id);
75
76     FromItem fromItem = _expr.bindSubPath(parser);
77
78     return fromItem;
79   }
80 }
81
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