Source for javax.xml.stream.util.EventReaderDelegate

   1: /* EventReaderDelegate.java -- 
   2:    Copyright (C) 2005  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 next()
  86:     throws XMLStreamException
  87:   {
  88:     if (parent != null)
  89:       return parent.next();
  90:     throw new NoSuchElementException();
  91:   }
  92: 
  93:   public boolean hasNext()
  94:     throws XMLStreamException
  95:   {
  96:     if (parent != null)
  97:       return parent.hasNext();
  98:     return false;
  99:   }
 100: 
 101:   public XMLEvent peek()
 102:     throws XMLStreamException
 103:   {
 104:     if (parent != null)
 105:       return parent.peek();
 106:     return null;
 107:   }
 108: 
 109:   public String getElementText()
 110:     throws XMLStreamException
 111:   {
 112:     if (parent != null)
 113:       return parent.getElementText();
 114:     throw new XMLStreamException();
 115:   }
 116: 
 117:   public XMLEvent nextTag()
 118:     throws XMLStreamException
 119:   {
 120:     if (parent != null)
 121:       return parent.nextTag();
 122:     throw new XMLStreamException();
 123:   }
 124: 
 125:   public Object getProperty(String name)
 126:     throws IllegalArgumentException
 127:   {
 128:     if (parent != null)
 129:       return parent.getProperty(name);
 130:     throw new IllegalArgumentException(name);
 131:   }
 132: 
 133: }