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


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.IdField;
32 import com.caucho.amber.query.FromItem;
33 import com.caucho.amber.query.QueryParser;
34 import com.caucho.amber.type.EntityType;
35 import com.caucho.util.CharBuffer;
36
37 /**
38  * A path expression that returns an entity.
39  */
40 public interface EntityPathExpr extends PathExpr {
41   /**
42    * Returns the entity type.
43    */
44   public EntityType getTargetType();
45
46   /**
47    * Returns the table.
48    */
49   public String JavaDoc getTable();
50
51   /**
52    * Binds the expression as a select item.
53    */
54   public FromItem bindSubPath(QueryParser parser);
55
56   /**
57    * Returns the from item
58    */
59   public FromItem getChildFromItem();
60
61   /**
62    * Generates the where expression for a subfield
63    */
64   public void generateWhere(CharBuffer cb, IdField field);
65
66   /**
67    * Generates the having expression.
68    */
69   public void generateHaving(CharBuffer cb, IdField field);
70 }
71
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