Source for javax.xml.stream.util.EventReaderDelegate

   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: }