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    1   /* ReaderDelegate.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 javax.xml.namespace.NamespaceContext;
   41   import javax.xml.namespace.QName;
   42   import javax.xml.stream.Location;
   43   import javax.xml.stream.XMLStreamConstants;
   44   import javax.xml.stream.XMLStreamException;
   45   import javax.xml.stream.XMLStreamReader;
   46   
   47   /**
   48    * Base class for XML stream reader filters.
   49    */
   50   public class ReaderDelegate
   51     implements XMLStreamReader, XMLStreamConstants
   52   {
   53   
   54     private XMLStreamReader parent;
   55   
   56     /**
   57      * Constructs an empty filter with no parent set.
   58      */
   59     public ReaderDelegate()
   60     {
   61     }
   62   
   63     /**
   64      * Constructs an empty filter with the specfied parent.
   65      */
   66     public ReaderDelegate(XMLStreamReader reader)
   67     {
   68       parent = reader;
   69     }
   70   
   71     /**
   72      * Sets the parent.
   73      */
   74     public void setParent(XMLStreamReader reader)
   75     {
   76       parent = reader;
   77     }
   78   
   79     /**
   80      * Returns the parent.
   81      */
   82     public XMLStreamReader getParent()
   83     {
   84       return parent;
   85     }
   86   
   87     public int next()
   88       throws XMLStreamException
   89     {
   90       if (parent != null)
   91         return parent.next();
   92       throw new XMLStreamException();
   93     }
   94   
   95     public int nextTag()
   96       throws XMLStreamException
   97     {
   98       if (parent != null)
   99         return parent.nextTag();
  100       throw new XMLStreamException();
  101     }
  102   
  103     public String getElementText()
  104       throws XMLStreamException
  105     {
  106       if (parent != null)
  107         return parent.getElementText();
  108       throw new XMLStreamException();
  109     }
  110   
  111     public void require(int type, String namespaceURI, String localName)
  112       throws XMLStreamException
  113     {
  114       if (parent != null)
  115         parent.require(type, namespaceURI, localName);
  116     }
  117   
  118     public boolean hasNext()
  119       throws XMLStreamException
  120     {
  121       if (parent != null)
  122         return parent.hasNext();
  123       return false;
  124     }
  125   
  126     public void close()
  127       throws XMLStreamException
  128     {
  129       if (parent != null)
  130         parent.close();
  131     }
  132   
  133     public String getNamespaceURI(String prefix)
  134     {
  135       if (parent != null)
  136         return parent.getNamespaceURI(prefix);
  137       return null;
  138     }
  139   
  140     public NamespaceContext getNamespaceContext()
  141     {
  142       if (parent != null)
  143         return parent.getNamespaceContext();
  144       return null;
  145     }
  146   
  147     public boolean isStartElement()
  148     {
  149       if (parent != null)
  150         return parent.isStartElement();
  151       return false;
  152     }
  153   
  154     public boolean isEndElement()
  155     {
  156       if (parent != null)
  157         return parent.isEndElement();
  158       return false;
  159     }
  160   
  161     public boolean isCharacters()
  162     {
  163       if (parent != null)
  164         return parent.isCharacters();
  165       return false;
  166     }
  167   
  168     public boolean isWhiteSpace()
  169     {
  170       if (parent != null)
  171         return parent.isWhiteSpace();
  172       return false;
  173     }
  174   
  175     public String getAttributeValue(String namespaceUri, String localName)
  176     {
  177       if (parent != null)
  178         return parent.getAttributeValue(namespaceUri, localName);
  179       return null;
  180     }
  181   
  182     public int getAttributeCount()
  183     {
  184       if (parent != null)
  185         return parent.getAttributeCount();
  186       return 0;
  187     }
  188   
  189     public QName getAttributeName(int index)
  190     {
  191       if (parent != null)
  192         return parent.getAttributeName(index);
  193       return null;
  194     }
  195   
  196     public String getAttributePrefix(int index)
  197     {
  198       if (parent != null)
  199         return parent.getAttributePrefix(index);
  200       return null;
  201     }
  202   
  203     public String getAttributeNamespace(int index)
  204     {
  205       if (parent != null)
  206         return parent.getAttributeNamespace(index);
  207       return null;
  208     }
  209   
  210     public String getAttributeLocalName(int index)
  211     {
  212       if (parent != null)
  213         return parent.getAttributeLocalName(index);
  214       return null;
  215     }
  216   
  217     public String getAttributeType(int index)
  218     {
  219       if (parent != null)
  220         return parent.getAttributeType(index);
  221       return null;
  222     }
  223   
  224     public String getAttributeValue(int index)
  225     {
  226       if (parent != null)
  227         return parent.getAttributeValue(index);
  228       return null;
  229     }
  230   
  231     public boolean isAttributeSpecified(int index)
  232     {
  233       if (parent != null)
  234         return parent.isAttributeSpecified(index);
  235       return false;
  236     }
  237   
  238     public int getNamespaceCount()
  239     {
  240       if (parent != null)
  241         return parent.getNamespaceCount();
  242       return 0;
  243     }
  244   
  245     public String getNamespacePrefix(int index)
  246     {
  247       if (parent != null)
  248         return parent.getNamespacePrefix(index);
  249       return null;
  250     }
  251   
  252     public String getNamespaceURI(int index)
  253     {
  254       if (parent != null)
  255         return parent.getNamespaceURI(index);
  256       return null;
  257     }
  258   
  259     public int getEventType()
  260     {
  261       if (parent != null)
  262         return parent.getEventType();
  263       return 0;
  264     }
  265   
  266     public String getText()
  267     {
  268       if (parent != null)
  269         return parent.getText();
  270       return null;
  271     }
  272   
  273     public int getTextCharacters(int sourceStart, char[] target,
  274                                  int targetStart, int length)
  275       throws XMLStreamException
  276     {
  277       if (parent != null)
  278         return parent.getTextCharacters(sourceStart, target, targetStart, length);
  279       return 0;
  280     }
  281   
  282     public char[] getTextCharacters()
  283     {
  284       if (parent != null)
  285         return parent.getTextCharacters();
  286       return null;
  287     }
  288   
  289     public int getTextStart()
  290     {
  291       if (parent != null)
  292         return parent.getTextStart();
  293       return 0;
  294     }
  295   
  296     public int getTextLength()
  297     {
  298       if (parent != null)
  299         return parent.getTextLength();
  300       return 0;
  301     }
  302   
  303     public String getEncoding()
  304     {
  305       if (parent != null)
  306         return parent.getEncoding();
  307       return null;
  308     }
  309   
  310     public boolean hasText()
  311     {
  312       if (parent != null)
  313         return parent.hasText();
  314       return false;
  315     }
  316   
  317     public Location getLocation()
  318     {
  319       if (parent != null)
  320         return parent.getLocation();
  321       return null;
  322     }
  323   
  324     public QName getName()
  325     {
  326       if (parent != null)
  327         return parent.getName();
  328       return null;
  329     }
  330   
  331     public String getLocalName()
  332     {
  333       if (parent != null)
  334         return parent.getLocalName();
  335       return null;
  336     }
  337   
  338     public boolean hasName()
  339     {
  340       if (parent != null)
  341         return parent.hasName();
  342       return false;
  343     }
  344   
  345     public String getNamespaceURI()
  346     {
  347       if (parent != null)
  348         return parent.getNamespaceURI();
  349       return null;
  350     }
  351   
  352     public String getPrefix()
  353     {
  354       if (parent != null)
  355         return parent.getPrefix();
  356       return null;
  357     }
  358   
  359     public String getVersion()
  360     {
  361       if (parent != null)
  362         return parent.getVersion();
  363       return null;
  364     }
  365   
  366     public boolean isStandalone()
  367     {
  368       if (parent != null)
  369         return parent.isStandalone();
  370       return false;
  371     }
  372   
  373     public boolean standaloneSet()
  374     {
  375       if (parent != null)
  376         return parent.standaloneSet();
  377       return false;
  378     }
  379   
  380     public String getCharacterEncodingScheme()
  381     {
  382       if (parent != null)
  383         return parent.getCharacterEncodingScheme();
  384       return null;
  385     }
  386   
  387     public String getPITarget()
  388     {
  389       if (parent != null)
  390         return parent.getPITarget();
  391       return null;
  392     }
  393   
  394     public String getPIData()
  395     {
  396       if (parent != null)
  397         return parent.getPIData();
  398       return null;
  399     }
  400   
  401     public Object getProperty(String name)
  402     {
  403       if (parent != null)
  404         return parent.getProperty(name);
  405       throw new IllegalArgumentException();
  406     }
  407     
  408   }
  409   

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