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


1 /*
2  * Copyright (c) 1998-2006 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 Software Foundation, 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.expr;
30
31 import com.caucho.amber.query.FromItem;
32 import com.caucho.amber.query.QueryParseException;
33 import com.caucho.amber.query.QueryParser;
34 import com.caucho.util.L10N;
35
36 /**
37  * Represents a collection from a from-item table.
38  */
39 public class CollectionSchemaExpr extends SchemaExpr {
40   private static final L10N L = new L10N(CollectionSchemaExpr.class);
41
42   private PathExpr _expr;
43   private String JavaDoc _name;
44
45   /**
46    * Creates the collection schema.
47    */
48   public CollectionSchemaExpr(PathExpr expr, String JavaDoc name)
49   {
50     _expr = expr;
51     _name = name;
52   }
53
54   /**
55    * Returns the tail name.
56    */
57   public String JavaDoc getTailName()
58   {
59     return _name;
60   }
61
62   /**
63    * Creates a field-based schema.
64    */
65   public SchemaExpr createField(QueryParser parser, String JavaDoc name)
66     throws QueryParseException
67   {
68     throw parser.error(L.l("collections in FROM may not be sub-collected."));
69   }
70
71   /**
72    * Adds the from item.
73    */
74   public FromItem addFromItem(QueryParser parser, String JavaDoc id)
75     throws QueryParseException
76   {
77     _expr = _expr.bindSelect(parser, id);
78
79     FromItem fromItem = _expr.bindSubPath(parser);
80
81     return fromItem;
82   }
83 }
84
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