Source for gnu.xml.stream.XMLEventReaderImpl

   1: /* XMLEventReaderImpl.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 gnu.xml.stream;
  39: 
  40: import javax.xml.stream.XMLEventReader;
  41: import javax.xml.stream.XMLStreamConstants;
  42: import javax.xml.stream.XMLStreamException;
  43: import javax.xml.stream.XMLStreamReader;
  44: import javax.xml.stream.events.XMLEvent;
  45: import javax.xml.stream.util.XMLEventAllocator;
  46: 
  47: /**
  48:  * Parser using XML events.
  49:  *
  50:  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  51:  */
  52: public class XMLEventReaderImpl
  53:   implements XMLEventReader
  54: {
  55: 
  56:   protected final XMLStreamReader reader;
  57:   protected final XMLEventAllocator allocator;
  58:   protected final String systemId;
  59:   protected XMLEvent peekEvent;
  60: 
  61:   protected XMLEventReaderImpl(XMLStreamReader reader,
  62:                                XMLEventAllocator allocator,
  63:                                String systemId)
  64:   {
  65:     this.reader = reader;
  66:     this.allocator = allocator;
  67:     this.systemId = systemId;
  68:   }
  69: 
  70:   public XMLEvent next()
  71:     throws XMLStreamException
  72:   {
  73:     XMLEvent ret = peek();
  74:     peekEvent = null;
  75:     return ret;
  76:   }
  77: 
  78:   public boolean hasNext()
  79:     throws XMLStreamException
  80:   {
  81:     return peekEvent != null || reader.hasNext();
  82:   }
  83:   
  84:   public XMLEvent peek()
  85:     throws XMLStreamException
  86:   {
  87:     if (peekEvent != null)
  88:       return peekEvent;
  89:     if (!reader.hasNext())
  90:       return null;
  91:     reader.next();
  92:     peekEvent = allocator.allocate(reader);
  93:     return peekEvent;
  94:   }
  95: 
  96:   public String getElementText()
  97:     throws XMLStreamException
  98:   {
  99:     return reader.getElementText();
 100:   }
 101: 
 102:   public XMLEvent nextTag()
 103:     throws XMLStreamException
 104:   {
 105:     if (peekEvent != null)
 106:       {
 107:         int eventType = peekEvent.getEventType();
 108:         if (eventType == XMLStreamConstants.START_ELEMENT ||
 109:             eventType == XMLStreamConstants.END_ELEMENT)
 110:           return peekEvent;
 111:         else
 112:           peekEvent = null;
 113:       }
 114:     reader.nextTag();
 115:     return allocator.allocate(reader);
 116:   }
 117: 
 118:   public Object getProperty(String name)
 119:     throws IllegalArgumentException
 120:   {
 121:     return reader.getProperty(name);
 122:   }
 123: 
 124: }