001/* EventReaderDelegate.java -- 
002   Copyright (C) 2005,2006  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package javax.xml.stream.util;
039
040import java.util.NoSuchElementException;
041import javax.xml.stream.XMLStreamException;
042import javax.xml.stream.XMLEventReader;
043import javax.xml.stream.events.XMLEvent;
044
045/**
046 * Base class for event reader filters.
047 */
048public class EventReaderDelegate
049  implements XMLEventReader
050{
051
052  private XMLEventReader parent;
053
054  /**
055   * Constructs an empty filter with no parent set.
056   */
057  public EventReaderDelegate()
058  {
059  }
060
061  /**
062   * Constructs an empty filter with the given parent.
063   */
064  public EventReaderDelegate(XMLEventReader reader)
065  {
066    parent = reader;
067  }
068
069  /**
070   * Sets the parent.
071   */
072  public void setParent(XMLEventReader reader)
073  {
074    parent = reader;
075  }
076
077  /**
078   * Returns the parent.
079   */
080  public XMLEventReader getParent()
081  {
082    return parent;
083  }
084
085  public XMLEvent nextEvent()
086    throws XMLStreamException
087  {
088    if (parent != null)
089      return parent.nextEvent();
090    throw new NoSuchElementException();
091  }
092
093  public Object next()
094  {
095    if (parent != null)
096      return parent.next();
097    throw new NoSuchElementException();
098  }
099
100  public boolean hasNext()
101  {
102    if (parent != null)
103      return parent.hasNext();
104    return false;
105  }
106
107  public XMLEvent peek()
108    throws XMLStreamException
109  {
110    if (parent != null)
111      return parent.peek();
112    return null;
113  }
114
115  public String getElementText()
116    throws XMLStreamException
117  {
118    if (parent != null)
119      return parent.getElementText();
120    throw new XMLStreamException();
121  }
122
123  public XMLEvent nextTag()
124    throws XMLStreamException
125  {
126    if (parent != null)
127      return parent.nextTag();
128    throw new XMLStreamException();
129  }
130
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
139  public void close()
140    throws XMLStreamException
141  {
142    if (parent != null)
143      parent.close();
144  }
145
146  public void remove()
147  {
148    throw new UnsupportedOperationException();
149  }
150
151}
152