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StylesheetPIHandler.javaAPI DocJava SE 5 API10587Fri Aug 26 14:56:04 BST 2005com.sun.org.apache.xml.internal.utils

StylesheetPIHandler

public class StylesheetPIHandler extends DefaultHandler
Search for the xml-stylesheet processing instructions in an XML document.
see
Associating Style Sheets with XML documents, Version 1.0

Fields Summary
String
m_baseID
The baseID of the document being processed.
String
m_media
The desired media criteria.
String
m_title
The desired title criteria.
String
m_charset
The desired character set criteria.
Vector
m_stylesheets
A list of SAXSource objects that match the criteria.
URIResolver
m_uriResolver
The object that implements the URIResolver interface, or null.
Constructors Summary
public StylesheetPIHandler(String baseID, String media, String title, String charset)
Construct a StylesheetPIHandler instance that will search for xml-stylesheet PIs based on the given criteria.

param
baseID The base ID of the XML document, needed to resolve relative IDs.
param
media The desired media criteria.
param
title The desired title criteria.
param
charset The desired character set criteria.


    m_baseID = baseID;
    m_media = media;
    m_title = title;
    m_charset = charset;
  
Methods Summary
public javax.xml.transform.SourcegetAssociatedStylesheet()
Return the last stylesheet found that match the constraints.

return
Source object that references the last stylesheet reference that matches the constraints.


    int sz = m_stylesheets.size();

    if (sz > 0)
    {
      Source source = (Source) m_stylesheets.elementAt(sz-1);
      return source;      
    }
    else
      return null;
  
public java.lang.StringgetBaseId()

       return m_baseID ;
   
public javax.xml.transform.URIResolvergetURIResolver()
Get the object that will be used to resolve URIs in href in xml-stylesheet processing instruction.

return
The URIResolver that was set with setURIResolver.

    return m_uriResolver;
  
public voidprocessingInstruction(java.lang.String target, java.lang.String data)
Handle the xml-stylesheet processing instruction.

param
target The processing instruction target.
param
data The processing instruction data, or null if none is supplied.
throws
org.xml.sax.SAXException Any SAX exception, possibly wrapping another exception.
see
org.xml.sax.ContentHandler#processingInstruction
see
Associating Style Sheets with XML documents, Version 1.0


    if (target.equals("xml-stylesheet"))
    {
      String href = null;  // CDATA #REQUIRED
      String type = null;  // CDATA #REQUIRED
      String title = null;  // CDATA #IMPLIED
      String media = null;  // CDATA #IMPLIED
      String charset = null;  // CDATA #IMPLIED
      boolean alternate = false;  // (yes|no) "no"
      StringTokenizer tokenizer = new StringTokenizer(data, " \t=\n", true);
      boolean lookedAhead = false; 
      Source source = null;

      String token = "";
      while (tokenizer.hasMoreTokens())
      {        
        if (!lookedAhead)
          token = tokenizer.nextToken();
        else
          lookedAhead = false;
        if (tokenizer.hasMoreTokens() && 
               (token.equals(" ") || token.equals("\t") || token.equals("=")))
          continue;
          
        String name = token;  
        if (name.equals("type"))
        { 
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
               (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          type = token.substring(1, token.length() - 1);
          
        }
        else if (name.equals("href"))
        {
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
               (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          href = token;
          if (tokenizer.hasMoreTokens())
          {
            token = tokenizer.nextToken();
            // If the href value has parameters to be passed to a 
            // servlet(something like "foobar?id=12..."), 
            // we want to make sure we get them added to
            // the href value. Without this check, we would move on 
            // to try to process another attribute and that would be
            // wrong.
            // We need to set lookedAhead here to flag that we
            // already have the next token. 
            while ( token.equals("=") && tokenizer.hasMoreTokens())
            {  
              href = href + token + tokenizer.nextToken();
              if (tokenizer.hasMoreTokens())
              {  
                token = tokenizer.nextToken();
                lookedAhead = true;
              }
              else
              {
                break;
              }
            }
          }
          href = href.substring(1, href.length() - 1);
          try
          { 
            // Add code to use a URIResolver. Patch from Dmitri Ilyin. 
            if (m_uriResolver != null) 
            {
              source = m_uriResolver.resolve(href, m_baseID);
            } 
           else 
            {
              href = SystemIDResolver.getAbsoluteURI(href, m_baseID);
              source = new SAXSource(new InputSource(href));
            }            
          }
          catch(TransformerException te)
          {
            throw new org.xml.sax.SAXException(te);
          }
        }
        else if (name.equals("title"))
        {
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
               (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          title = token.substring(1, token.length() - 1);
        }
        else if (name.equals("media"))
        {
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
               (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          media = token.substring(1, token.length() - 1);
        }
        else if (name.equals("charset"))
        {
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
              (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          charset = token.substring(1, token.length() - 1);
        }
        else if (name.equals("alternate"))
        {
          token = tokenizer.nextToken();
          while (tokenizer.hasMoreTokens() && 
               (token.equals(" " ) || token.equals("\t") || token.equals("=")))
            token = tokenizer.nextToken();
          alternate = token.substring(1, token.length()
                                             - 1).equals("yes");
        }
        
      }

      if ((null != type) 
          && (type.equals("text/xsl") || type.equals("text/xml") || type.equals("application/xml+xslt"))  
          && (null != href))
      {
        if (null != m_media)
        {
          if (null != media)
          {
            if (!media.equals(m_media))
              return;
          }
          else
            return;
        }

        if (null != m_charset)
        {
          if (null != charset)
          {
            if (!charset.equals(m_charset))
              return;
          }
          else
            return;
        }

        if (null != m_title)
        {
          if (null != title)
          {
            if (!title.equals(m_title))
              return;
          }
          else
            return;
        }

        m_stylesheets.addElement(source);
      }
    }
  
public voidsetBaseId(java.lang.String baseId)
Added additional getter and setter methods for the Base Id to fix bugzilla bug 24187

       m_baseID = baseId;
 
   
public voidsetURIResolver(javax.xml.transform.URIResolver resolver)
Get the object that will be used to resolve URIs in href in xml-stylesheet processing instruction.

param
resolver An object that implements the URIResolver interface, or null.


                                 
     
  
    m_uriResolver = resolver;
  
public voidstartElement(java.lang.String namespaceURI, java.lang.String localName, java.lang.String qName, org.xml.sax.Attributes atts)
The spec notes that "The xml-stylesheet processing instruction is allowed only in the prolog of an XML document.", so, at least for right now, I'm going to go ahead an throw a TransformerException in order to stop the parse.

param
uri The Namespace URI, or an empty string.
param
localName The local name (without prefix), or empty string if not namespace processing.
param
rawName The qualified name (with prefix).
param
attributes The specified or defaulted attributes.
throws
StopParseException since there can be no valid xml-stylesheet processing instructions past the first element.

    throw new StopParseException();