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  /*
   * $Id: SAXSource.java,v 1.6 2010-11-01 04:36:12 joehw Exp $
   * %W% %E%
   */
  package mf.javax.xml.transform.sax;
  
  import org.xml.sax.InputSource;
  import org.xml.sax.XMLReader;
  
  import mf.javax.xml.transform.Source;
  import mf.javax.xml.transform.stream.StreamSource;
  
  /**
   * <p>Acts as an holder for SAX-style Source.</p>
   * <p/>
   * <p>Note that XSLT requires namespace support. Attempting to transform an
   * input source that is not
   * generated with a namespace-aware parser may result in errors.
   * Parsers can be made namespace aware by calling the
   * {@link javax.xml.parsers.SAXParserFactory#setNamespaceAware(boolean awareness)} method.</p>
   *
   * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
   * @version $Revision: 1.6 $, $Date: 2010-11-01 04:36:12 $
   */
  public class SAXSource implements Source {
  
      /**
       * If {@link javax.xml.transform.TransformerFactory#getFeature}
       * returns true when passed this value as an argument,
       * the Transformer supports Source input of this type.
       */
      public static final String FEATURE =
              "http://javax.xml.transform.sax.SAXSource/feature";
      /**
       * The XMLReader to be used for the source tree input. May be null.
       */
      private XMLReader reader;
      /**
       * <p>The SAX InputSource to be used for the source tree input.
       * Should not be <code>null</code>.</p>
       */
      private InputSource inputSource;
  
      /**
       * <p>Zero-argument default constructor.  If this constructor is used, and
       * no SAX source is set using
       * {@link #setInputSource(InputSource inputSource)} , then the
       * <code>Transformer</code> will
       * create an empty source {@link org.xml.sax.InputSource} using
       * {@link org.xml.sax.InputSource#InputSource() new InputSource()}.</p>
       *
       * @see javax.xml.transform.Transformer#transform(Source xmlSource, Result outputTarget)
       */
      public SAXSource() {
      }
  
      /**
       * Create a <code>SAXSource</code>, using an {@link org.xml.sax.XMLReader}
       * and a SAX InputSource. The {@link javax.xml.transform.Transformer}
       * or {@link javax.xml.transform.sax.SAXTransformerFactory} will set itself
       * to be the reader's {@link org.xml.sax.ContentHandler}, and then will call
       * reader.parse(inputSource).
       *
       * @param reader      An XMLReader to be used for the parse.
       * @param inputSource A SAX input source reference that must be non-null
       *                    and that will be passed to the reader parse method.
       */
      public SAXSource(XMLReader reader, InputSource inputSource) {
          this.reader = reader;
          this.inputSource = inputSource;
      }
  
      /**
       * Create a <code>SAXSource</code>, using a SAX <code>InputSource</code>.
       * The {@link javax.xml.transform.Transformer} or
       * {@link javax.xml.transform.sax.SAXTransformerFactory} creates a
       * reader via {@link org.xml.sax.helpers.XMLReaderFactory}
       * (if setXMLReader is not used), sets itself as
       * the reader's {@link org.xml.sax.ContentHandler}, and calls
       * reader.parse(inputSource).
       *
       * @param inputSource An input source reference that must be non-null
       *                    and that will be passed to the parse method of the reader.
       */
      public SAXSource(InputSource inputSource) {
          this.inputSource = inputSource;
      }
  
      /**
       * Attempt to obtain a SAX InputSource object from a Source
       * object.
       *
       * @param source Must be a non-null Source reference.
       * @return An InputSource, or null if Source can not be converted.
       */
      public static InputSource sourceToInputSource(Source source) {
  
          if (source instanceof SAXSource) {
              return ((SAXSource) source).getInputSource();
          } else if (source instanceof StreamSource) {
              StreamSource ss = (StreamSource) source;
              InputSource isource = new InputSource(ss.getSystemId());
  
              isource.setByteStream(ss.getInputStream());
              isource.setCharacterStream(ss.getReader());
              isource.setPublicId(ss.getPublicId());
  
              return isource;
          } else {
              return null;
          }
      }
  
      /**
       * Get the XMLReader to be used for the Source.
       *
       * @return A valid XMLReader or XMLFilter reference, or null.
       */
      public XMLReader getXMLReader() {
          return reader;
      }
  
      /**
       * Set the XMLReader to be used for the Source.
       *
       * @param reader A valid XMLReader or XMLFilter reference.
       */
      public void setXMLReader(XMLReader reader) {
          this.reader = reader;
      }
  
      /**
       * Get the SAX InputSource to be used for the Source.
       *
       * @return A valid InputSource reference, or null.
       */
      public InputSource getInputSource() {
          return inputSource;
      }
  
      /**
       * Set the SAX InputSource to be used for the Source.
       *
       * @param inputSource A valid InputSource reference.
       */
      public void setInputSource(InputSource inputSource) {
          this.inputSource = inputSource;
      }
  
      /**
       * <p>Get the base ID (URI or system ID) from where URIs
       * will be resolved.</p>
       *
       * @return Base URL for the <code>Source</code>, or <code>null</code>.
       */
      @Override
      public String getSystemId() {
  
          if (inputSource == null) {
              return null;
          } else {
              return inputSource.getSystemId();
          }
      }
  
      /**
       * Set the system identifier for this Source.  If an input source
       * has already been set, it will set the system ID or that
       * input source, otherwise it will create a new input source.
       * <p/>
       * <p>The system identifier is optional if there is a byte stream
       * or a character stream, but it is still useful to provide one,
       * since the application can use it to resolve relative URIs
       * and can include it in error messages and warnings (the parser
       * will attempt to open a connection to the URI only if
       * no byte stream or character stream is specified).</p>
       *
       * @param systemId The system identifier as a URI string.
       */
      @Override
      public void setSystemId(String systemId) {
  
          if (null == inputSource) {
              inputSource = new InputSource(systemId);
          } else {
              inputSource.setSystemId(systemId);
          }
      }
  }
  