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Java > Open Source Codes > com > caucho > relaxng > pattern > DataPattern


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.relaxng.pattern;
30
31 import com.caucho.relaxng.RelaxException;
32 import com.caucho.relaxng.program.DataItem;
33 import com.caucho.relaxng.program.Item;
34
35 /**
36  * Relax empty pattern
37  */
38 public class DataPattern extends Pattern {
39   String JavaDoc _type;
40   /**
41    * Creates a new empty pattern.
42    */
43   public DataPattern(String JavaDoc type)
44   {
45     _type = type;
46   }
47
48   /**
49    * Creates the program (somewhat bogus)
50    */
51   public Item createItem(GrammarPattern grammar)
52     throws RelaxException
53   {
54     return new DataItem(_type);
55   }
56
57   /**
58    * Returns a string for the production.
59    */
60   public String JavaDoc toProduction()
61   {
62     return "data";
63   }
64
65   /**
66    * Returns true if it contains a data element.
67    */
68   public boolean hasData()
69   {
70     return true;
71   }
72
73   public boolean equals(Object JavaDoc o)
74   {
75     if (this == o)
76       return true;
77
78     if (! (o instanceof DataPattern))
79       return false;
80
81     DataPattern pattern = (DataPattern) o;
82
83     return _type.equals(pattern._type);
84   }
85
86   /**
87    * Debugging.
88    */
89   public String JavaDoc toString()
90   {
91     return "DataPattern[" + _type + "]";
92   }
93 }
94
95
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