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


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 import com.caucho.amber.type.EntityType;
34
35 import com.caucho.amber.field.AmberField;
36
37 /**
38  * Represents from-item table.
39  */
40 public class FromIdSchemaExpr extends SchemaExpr {
41   private static final L10N L = new L10N(FromIdSchemaExpr.class);
42   
43   private IdExpr _id;
44
45   /**
46    * Creates the table id expr.
47    */
48   public FromIdSchemaExpr(IdExpr id)
49   {
50     _id = id;
51   }
52
53   /**
54    * Returns the tail name.
55    */
56   public String getTailName()
57   {
58     return _id.getId();
59   }
60
61   /**
62    * Creates a field-based schema.
63    */
64   public SchemaExpr createField(QueryParser parser, String name)
65     throws QueryParseException
66   {
67     EntityType type = _id.getTargetType();
68
69     AmberField field = type.getField(name);
70
71     if (field == null)
72       throw parser.error(L.l("{0}: '{1}' is an unknown field.",
73                  type.getBeanClass().getName(),
74                  name));
75
76     AmberExpr fieldExpr = _id.createField(parser, name);
77
78     if (fieldExpr instanceof ManyToOneExpr)
79       return new CollectionSchemaExpr((ManyToOneExpr) fieldExpr, name);
80       /*
81     else if (fieldExpr instanceof ManyToManyExpr)
82       return new ManyToManySchemaExpr((ManyToManyExpr) fieldExpr);
83       */
84     else if (fieldExpr instanceof OneToManyExpr)
85       return new OneToManySchemaExpr((OneToManyExpr) fieldExpr);
86     throw parser.error(L.l("{0}: '{1}' must be a collection.",
87                type.getBeanClass().getName(),
88                name));
89   }
90
91   /**
92    * Adds the from item.
93    */
94   public FromItem addFromItem(QueryParser parser, String id)
95     throws QueryParseException
96   {
97     return parser.addFromItem(_id.getTargetType().getTable(), id);
98   }
99 }
100
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