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


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 Rodrigo Westrupp
27  */
28
29 package com.caucho.amber.expr;
30
31 import com.caucho.amber.field.AmberField;
32 import com.caucho.amber.query.FromItem;
33 import com.caucho.amber.query.QueryParseException;
34 import com.caucho.amber.query.QueryParser;
35 import com.caucho.amber.type.EmbeddableType;
36 import com.caucho.util.L10N;
37
38 /**
39  * Represents an embedded from a from-item table.
40  */
41 public class EmbeddedSchemaExpr extends SchemaExpr {
42   private static final L10N L = new L10N(EmbeddedSchemaExpr.class);
43
44   private EmbeddedExpr _expr;
45   private String JavaDoc _name;
46
47   /**
48    * Creates the embedded schema.
49    */
50   public EmbeddedSchemaExpr(EmbeddedExpr expr,
51                             String JavaDoc name)
52   {
53     _expr = expr;
54     _name = name;
55   }
56
57   /**
58    * Returns the tail name.
59    */
60   public String JavaDoc getTailName()
61   {
62     return _name;
63   }
64
65   /**
66    * Returns the embedded expression.
67    */
68   public EmbeddedExpr getExpr()
69   {
70     return _expr;
71   }
72
73   /**
74    * Creates a field-based schema.
75    */
76   public SchemaExpr createField(QueryParser parser, String JavaDoc name)
77     throws QueryParseException
78   {
79     EmbeddableType type = _expr.getTargetType();
80
81     AmberField field = type.getField(name);
82
83     if (field == null)
84       throw parser.error(L.l("{0}: '{1}' is an unknown field.",
85                              type.getBeanClass().getName(),
86                              name));
87
88     AmberExpr fieldExpr = _expr.createField(parser, name);
89
90     if (fieldExpr instanceof EmbeddedExpr)
91       return new EmbeddedSchemaExpr((EmbeddedExpr) fieldExpr, name);
92
93     throw parser.error(L.l("{0}: '{1}' must be a collection or one-to-one relationship.",
94                            type.getBeanClass().getName(),
95                            name));
96   }
97
98   /**
99    * Adds the from item.
100    */
101   public FromItem addFromItem(QueryParser parser, String JavaDoc id)
102     throws QueryParseException
103   {
104     _expr = (EmbeddedExpr) _expr.bindSelect(parser, id);
105
106     FromItem fromItem = _expr.bindSubPath(parser);
107
108     return fromItem;
109   }
110
111   public String JavaDoc toString()
112   {
113     return "EmbeddedSchemaExpr[" + _name + "]";
114   }
115 }
116
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