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Java > Open Source Codes > com > caucho > db > sql > FromItem


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 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.db.sql;
30
31 import com.caucho.db.table.Table;
32 import com.caucho.log.Log;
33
34 import java.util.ArrayList JavaDoc;
35 import java.util.logging.Logger JavaDoc;
36
37 /**
38  * Represents a table binding for a from.
39  */
40 class FromItem {
41   private static final Logger JavaDoc log = Log.open(FromItem.class);
42
43   private Table _table;
44   private String JavaDoc _name;
45
46   private FromItem _dependTable;
47
48   FromItem(Table table, String JavaDoc name)
49   {
50     _table = table;
51     _name = name;
52   }
53
54   /**
55    * Returns the FROM item's table.
56    */
57   public Table getTable()
58   {
59     return _table;
60   }
61
62   /**
63    * Returns the FROM item's name.
64    */
65   public String JavaDoc getName()
66   {
67     return _name;
68   }
69
70   /**
71    * Sets a depend table.
72    */
73   void setDependTable(FromItem table)
74   {
75     _dependTable = table;
76   }
77
78   /**
79    * Returns true if the given table order is valid.
80    */
81   boolean isValid(ArrayList JavaDoc<FromItem> tables)
82   {
83     if (_dependTable == null)
84       return true;
85     else
86       return ! tables.contains(this) || tables.contains(_dependTable);
87   }
88
89   /**
90    * Printable version of the FROM item.
91    */
92   public String JavaDoc toString()
93   {
94     return "FromItem[" + getTable().getName() + " AS " + _name + "]";
95   }
96 }
97
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