LoadEmbeddedExpr


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.entity.Embeddable;
32  import com.caucho.amber.field.AmberField;
33  import com.caucho.amber.manager.AmberConnection;
34  import com.caucho.amber.query.FromItem;
35  import com.caucho.amber.query.QueryParser;
36  import com.caucho.amber.table.LinkColumns;
37  import com.caucho.amber.table.Table;
38  import com.caucho.amber.type.EmbeddableType;
39  import com.caucho.amber.type.Type;
40  import com.caucho.util.CharBuffer;
41  
42  import java.lang.reflect.Method  ;
43  import java.sql.ResultSet  ;
44  import java.sql.SQLException  ;
45  import java.util.ArrayList  ;
46  import java.util.HashSet  ;
47  import java.util.Iterator  ;
48  import java.util.Map  ;
49  
50  /**
51   * An embedded expression which should be loaded.
52   */
53  public class LoadEmbeddedExpr extends LoadExpr {
54  
55    LoadEmbeddedExpr(PathExpr expr)
56    {
57      super(expr);
58    }
59  
60    /**
61     * Returns the embeddable type.
62     */
63    public EmbeddableType getEmbeddableType()
64    {
65      return (EmbeddableType) getType();
66    }
67  
68    /**
69     * Binds the expression as a select item.
70     */
71    public AmberExpr bindSelect(QueryParser parser)
72    {
73      _fromItem = _expr.bindSubPath(parser);
74  
75      if (_fromItem == null)
76        throw new NullPointerException  (_expr.getClass().getName() + " " + _expr);
77  
78      return this;
79    }
80  
81    /**
82     * Returns the object for the expr.
83     */
84    public Object   getObject(AmberConnection aConn, ResultSet   rs, int index)
85      throws SQLException  
86    {
87      Embeddable embeddable = getEmbeddableType().createObject();
88  
89      embeddable.__caucho_load(aConn, rs, index);
90  
91      return embeddable;
92    }
93  
94    /**
95     * Returns the object for the expr.
96     */
97    public Object   getCacheObject(AmberConnection aConn,
98                                 ResultSet   rs,
99                                 int index)
100     throws SQLException  
101   {
102     // XXX: needs to handle embeddable type caching.
103 
104     return getObject(aConn, rs, index);
105   }
106 }
107
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