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


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 /**
32  * Represents from-item table.
33  */
34 abstract public class SchemaExpr {
35   /**
36    * Returns the tail name.
37    */
38   abstract public String getTailName();
39
40   /**
41    * Creates a field-based schema.
42    */
43   abstract public SchemaExpr createField(QueryParser parser, String name)
44     throws QueryParseException;
45   
46   /**
47    * Adds the from item.
48    */
49   abstract public FromItem addFromItem(QueryParser parser, String id)
50     throws QueryParseException;
51 }
52
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