libjava/classpath/javax/xml/stream/util/EventReaderDelegate.java

   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    */
  57   public EventReaderDelegate()
  58   {
  59   }
  60
  61   /**
  62    * Constructs an empty filter with the given parent.
  63    */
  64   public EventReaderDelegate(XMLEventReader reader)
  65   {
  66     parent = reader;
  67   }
  68
  69   /**
  70    * Sets the parent.
  71    */
  72   public void setParent(XMLEventReader reader)
  73   {
  74     parent = reader;
  75   }
  76
  77   /**
  78    * Returns the parent.
  79    */
  80   public XMLEventReader getParent()
  81   {
  82     return parent;
  83   }
  84
  85   public XMLEvent nextEvent()
  86     throws XMLStreamException
  87   {
  88     if (parent != null)
  89       return parent.nextEvent();
  90     throw new NoSuchElementException();
  91   }
  92
  93   public Object next()
  94   {
  95     if (parent != null)
  96       return parent.next();
  97     throw new NoSuchElementException();
  98   }
  99
 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