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


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.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.EntityType;
36 import com.caucho.util.L10N;
37
38 /**
39  * Represents from-item table.
40  */
41 public class FromIdSchemaExpr extends SchemaExpr {
42   private static final L10N L = new L10N(FromIdSchemaExpr.class);
43
44   private IdExpr _id;
45
46   /**
47    * Creates the table id expr.
48    */
49   public FromIdSchemaExpr(IdExpr id)
50   {
51     _id = id;
52   }
53
54   /**
55    * Returns the tail name.
56    */
57   public String JavaDoc getTailName()
58   {
59     return _id.getId();
60   }
61
62   /**
63    * Creates a field-based schema.
64    */
65   public SchemaExpr createField(QueryParser parser, String JavaDoc name)
66     throws QueryParseException
67   {
68     EntityType type = _id.getTargetType();
69
70     AmberField field = type.getField(name);
71
72     if (field == null)
73       throw parser.error(L.l("{0}: '{1}' is an unknown field.",
74                              type.getBeanClass().getName(),
75                              name));
76
77     AmberExpr fieldExpr = _id.createField(parser, name);
78
79     if (fieldExpr instanceof ManyToOneExpr)
80       return new ManyToOneSchemaExpr((ManyToOneExpr) fieldExpr, name);
81
82     /*
83       if (fieldExpr instanceof ManyToManyExpr)
84       return new ManyToManySchemaExpr((ManyToManyExpr) fieldExpr);
85     */
86
87     if (fieldExpr instanceof OneToManyExpr)
88       return new OneToManySchemaExpr((OneToManyExpr) fieldExpr);
89
90     if (fieldExpr instanceof DependentEntityOneToOneExpr)
91       return new OneToOneSchemaExpr((DependentEntityOneToOneExpr) fieldExpr, name);
92
93     if (fieldExpr instanceof EmbeddedExpr)
94       return new EmbeddedSchemaExpr((EmbeddedExpr) fieldExpr, name);
95
96     throw parser.error(L.l("{0}: '{1}' must be a collection or one-to-one relationship.",
97                            type.getBeanClass().getName(),
98                            name));
99   }
100
101   /**
102    * Adds the from item.
103    */
104   public FromItem addFromItem(QueryParser parser, String JavaDoc id)
105     throws QueryParseException
106   {
107     return parser.addFromItem(_id.getTargetType().getTable(), id);
108   }
109 }
110
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