01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
35: import java.util.logging.Logger;
36:
37: /**
38: * Represents a table binding for a from.
39: */
40: class FromItem {
41: private static final Logger log = Log.open(FromItem.class);
42:
43: private Table _table;
44: private String _name;
45:
46: private FromItem _dependTable;
47:
48: FromItem(Table table, String name) {
49: _table = table;
50: _name = name;
51: }
52:
53: /**
54: * Returns the FROM item's table.
55: */
56: public Table getTable() {
57: return _table;
58: }
59:
60: /**
61: * Returns the FROM item's name.
62: */
63: public String getName() {
64: return _name;
65: }
66:
67: /**
68: * Sets a depend table.
69: */
70: void setDependTable(FromItem table) {
71: _dependTable = table;
72: }
73:
74: /**
75: * Returns true if the given table order is valid.
76: */
77: boolean isValid(ArrayList<FromItem> tables) {
78: if (_dependTable == null)
79: return true;
80: else
81: return !tables.contains(this )
82: || tables.contains(_dependTable);
83: }
84:
85: /**
86: * Printable version of the FROM item.
87: */
88: public String toString() {
89: return "FromItem[" + getTable().getName() + " AS " + _name
90: + "]";
91: }
92: }
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