1 /* EventReaderDelegate.java --
2    Copyright (C) 2005,2006  Free Software Foundation, Inc.
3 
4 This file is part of GNU Classpath.
5 
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10 
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING.  If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20 
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library.  Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25 
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module.  An independent module is a module which is not derived from
33 or based on this library.  If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so.  If you do not wish to do so, delete this
36 exception statement from your version. */
37 
38 package javax.xml.stream.util;
39 
40 import java.util.NoSuchElementException;
41 import javax.xml.stream.XMLStreamException;
42 import javax.xml.stream.XMLEventReader;
43 import javax.xml.stream.events.XMLEvent;
44 
45 /**
46  * Base class for event reader filters.
47  */
48 public class EventReaderDelegate
49   implements XMLEventReader
50 {
51 
52   private XMLEventReader parent;
53 
54   /**
55    * Constructs an empty filter with no parent set.
56    */
EventReaderDelegate()57   public EventReaderDelegate()
58   {
59   }
60 
61   /**
62    * Constructs an empty filter with the given parent.
63    */
EventReaderDelegate(XMLEventReader reader)64   public EventReaderDelegate(XMLEventReader reader)
65   {
66     parent = reader;
67   }
68 
69   /**
70    * Sets the parent.
71    */
setParent(XMLEventReader reader)72   public void setParent(XMLEventReader reader)
73   {
74     parent = reader;
75   }
76 
77   /**
78    * Returns the parent.
79    */
getParent()80   public XMLEventReader getParent()
81   {
82     return parent;
83   }
84 
nextEvent()85   public XMLEvent nextEvent()
86     throws XMLStreamException
87   {
88     if (parent != null)
89       return parent.nextEvent();
90     throw new NoSuchElementException();
91   }
92 
next()93   public Object next()
94   {
95     if (parent != null)
96       return parent.next();
97     throw new NoSuchElementException();
98   }
99 
hasNext()100   public boolean hasNext()
101   {
102     if (parent != null)
103       return parent.hasNext();
104     return false;
105   }
106 
peek()107   public XMLEvent peek()
108     throws XMLStreamException
109   {
110     if (parent != null)
111       return parent.peek();
112     return null;
113   }
114 
getElementText()115   public String getElementText()
116     throws XMLStreamException
117   {
118     if (parent != null)
119       return parent.getElementText();
120     throw new XMLStreamException();
121   }
122 
nextTag()123   public XMLEvent nextTag()
124     throws XMLStreamException
125   {
126     if (parent != null)
127       return parent.nextTag();
128     throw new XMLStreamException();
129   }
130 
getProperty(String name)131   public Object getProperty(String name)
132     throws IllegalArgumentException
133   {
134     if (parent != null)
135       return parent.getProperty(name);
136     throw new IllegalArgumentException(name);
137   }
138 
close()139   public void close()
140     throws XMLStreamException
141   {
142     if (parent != null)
143       parent.close();
144   }
145 
remove()146   public void remove()
147   {
148     throw new UnsupportedOperationException();
149   }
150 
151 }
152