parseradapter.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 1,026 行 · 第 1/2 页

		// (and similarly named) attributes ... at most, warn
		continue;
	    } else 		// xmlns:foo=...
		prefix = attQName.substring(n+1);

	    String value = qAtts.getValue(i);
	    if (!nsSupport.declarePrefix(prefix, value)) {
		reportError("Illegal Namespace prefix: " + prefix);
		continue;
	    }
	    if (contentHandler != null)
		contentHandler.startPrefixMapping(prefix, value);
	}
	
				// Second pass: copy all relevant
				// attributes into the SAX2 AttributeList
				// using updated prefix bindings
	atts.clear();
	for (int i = 0; i < length; i++) {
	    String attQName = qAtts.getName(i);
	    String type = qAtts.getType(i);
	    String value = qAtts.getValue(i);

				// Declaration?
	    if (attQName.startsWith("xmlns")) {
		String prefix;
		int n = attQName.indexOf(':');

		if (n == -1 && attQName.length () == 5) {
		    prefix = "";
		} else if (n != 5) {
		    // XML namespaces spec doesn't discuss "xmlnsf:oo"
		    // (and similarly named) attributes ... ignore
		    prefix = null;
		} else {
		    prefix = attQName.substring(n+1);
		}
				// Yes, decl:  report or prune
		if (prefix != null) {
		    if (prefixes)
			atts.addAttribute("", "", attQName.intern(),
				      type, value);
		    continue;
		}
	    } 

				// Not a declaration -- report
	    try {
		String attName[] = processName(attQName, true, true);
		atts.addAttribute(attName[0], attName[1], attName[2],
				  type, value);
	    } catch (SAXException e) {
		if (exceptions == null)
		    exceptions = new Vector();
		exceptions.addElement(e);
		atts.addAttribute("", attQName, attQName, type, value);
	    }
	}
	
	// now handle the deferred exception reports
	if (exceptions != null && errorHandler != null) {
	    for (int i = 0; i < exceptions.size(); i++)
		errorHandler.error((SAXParseException)
				(exceptions.elementAt(i)));
	}

				// OK, finally report the event.
	if (contentHandler != null) {
	    String name[] = processName(qName, false, false);
	    contentHandler.startElement(name[0], name[1], name[2], atts);
	}
    }


    /**
     * Adapter implementation method; do not call.
     * Adapt a SAX1 end element event.
     *
     * @param qName The qualified (prefixed) name.
     * @exception SAXException The client may raise a
     *            processing exception.
     * @see org.xml.sax.DocumentHandler#endElement
     */
    public void endElement (String qName)
	throws SAXException
    {
				// If we're not doing Namespace
				// processing, dispatch this quickly.
	if (!namespaces) {
	    if (contentHandler != null) {
		contentHandler.endElement("", "", qName.intern());
	    }
	    return;
	}

				// Split the name.
	String names[] = processName(qName, false, false);
	if (contentHandler != null) {
	    contentHandler.endElement(names[0], names[1], names[2]);
	    Enumeration prefixes = nsSupport.getDeclaredPrefixes();
	    while (prefixes.hasMoreElements()) {
		String prefix = (String)prefixes.nextElement();
		contentHandler.endPrefixMapping(prefix);
	    }
	}
	nsSupport.popContext();
    }


    /**
     * Adapter implementation method; do not call.
     * Adapt a SAX1 characters event.
     *
     * @param ch An array of characters.
     * @param start The starting position in the array.
     * @param length The number of characters to use.
     * @exception SAXException The client may raise a
     *            processing exception.
     * @see org.xml.sax.DocumentHandler#characters
     */
    public void characters (char ch[], int start, int length)
	throws SAXException
    {
	if (contentHandler != null) {
	    contentHandler.characters(ch, start, length);
	}
    }


    /**
     * Adapter implementation method; do not call.
     * Adapt a SAX1 ignorable whitespace event.
     *
     * @param ch An array of characters.
     * @param start The starting position in the array.
     * @param length The number of characters to use.
     * @exception SAXException The client may raise a
     *            processing exception.
     * @see org.xml.sax.DocumentHandler#ignorableWhitespace
     */
    public void ignorableWhitespace (char ch[], int start, int length)
	throws SAXException
    {
	if (contentHandler != null) {
	    contentHandler.ignorableWhitespace(ch, start, length);
	}
    }


    /**
     * Adapter implementation method; do not call.
     * Adapt a SAX1 processing instruction event.
     *
     * @param target The processing instruction target.
     * @param data The remainder of the processing instruction
     * @exception SAXException The client may raise a
     *            processing exception.
     * @see org.xml.sax.DocumentHandler#processingInstruction
     */
    public void processingInstruction (String target, String data)
	throws SAXException
    {
	if (contentHandler != null) {
	    contentHandler.processingInstruction(target, data);
	}
    }



    ////////////////////////////////////////////////////////////////////
    // Internal utility methods.
    ////////////////////////////////////////////////////////////////////


    /**
     * Initialize the parser before each run.
     */
    private void setupParser ()
    {
	nsSupport.reset();

	if (entityResolver != null) {
	    parser.setEntityResolver(entityResolver);
	}
	if (dtdHandler != null) {
	    parser.setDTDHandler(dtdHandler);
	}
	if (errorHandler != null) {
	    parser.setErrorHandler(errorHandler);
	}
	parser.setDocumentHandler(this);
	locator = null;
    }


    /**
     * Process a qualified (prefixed) name.
     *
     * <p>If the name has an undeclared prefix, use only the qname
     * and make an ErrorHandler.error callback in case the app is
     * interested.</p>
     *
     * @param qName The qualified (prefixed) name.
     * @param isAttribute true if this is an attribute name.
     * @return The name split into three parts.
     * @exception SAXException The client may throw
     *            an exception if there is an error callback.
     */
    private String [] processName (String qName, boolean isAttribute,
				   boolean useException)
	throws SAXException
    {
	String parts[] = nsSupport.processName(qName, nameParts,
					       isAttribute);
	if (parts == null) {
	    if (useException)
		throw makeException("Undeclared prefix: " + qName);
	    reportError("Undeclared prefix: " + qName);
	    parts = new String[3];
	    parts[0] = parts[1] = "";
	    parts[2] = qName.intern();
	}
	return parts;
    }


    /**
     * Report a non-fatal error.
     *
     * @param message The error message.
     * @exception SAXException The client may throw
     *            an exception.
     */
    void reportError (String message)
	throws SAXException
    {
	if (errorHandler != null)
	    errorHandler.error(makeException(message));
    }

    
    /**
     * Construct an exception for the current context.
     *
     * @param message The error message.
     */
    private SAXParseException makeException (String message)
    {
	if (locator != null) {
	    return new SAXParseException(message, locator);
	} else {
	    return new SAXParseException(message, null, null, -1, -1);
	}
    }


    /**
     * Throw an exception if we are parsing.
     *
     * <p>Use this method to detect illegal feature or
     * property changes.</p>
     *
     * @param type The type of thing (feature or property).
     * @param name The feature or property name.
     * @exception SAXNotSupportedException If a
     *            document is currently being parsed.
     */
    private void checkNotParsing (String type, String name)
	throws SAXNotSupportedException
    {
	if (parsing) {
	    throw new SAXNotSupportedException("Cannot change " +
					       type + ' ' +
					       name + " while parsing");
					       
	}
    }



    ////////////////////////////////////////////////////////////////////
    // Internal state.
    ////////////////////////////////////////////////////////////////////

    private NamespaceSupport nsSupport;
    private AttributeListAdapter attAdapter;

    private boolean parsing = false;
    private String nameParts[] = new String[3];

    private Parser parser = null;

    private AttributesImpl atts = null;

				// Features
    private boolean namespaces = true;
    private boolean prefixes = false;

				// Properties

				// Handlers
    Locator locator;

    EntityResolver entityResolver = null;
    DTDHandler dtdHandler = null;
    ContentHandler contentHandler = null;
    ErrorHandler errorHandler = null;



    ////////////////////////////////////////////////////////////////////
    // Inner class to wrap an AttributeList when not doing NS proc.
    ////////////////////////////////////////////////////////////////////


    /**
     * Adapt a SAX1 AttributeList as a SAX2 Attributes object.
     *
     * <p>This class is in the Public Domain, and comes with NO
     * WARRANTY of any kind.</p>
     *
     * <p>This wrapper class is used only when Namespace support
     * is disabled -- it provides pretty much a direct mapping
     * from SAX1 to SAX2, except that names and types are 
     * interned whenever requested.</p>
     */
    final class AttributeListAdapter implements Attributes
    {

	/**
	 * Construct a new adapter.
	 */
	AttributeListAdapter ()
	{
	}


	/**
	 * Set the embedded AttributeList.
	 *
	 * <p>This method must be invoked before any of the others
	 * can be used.</p>
	 *
	 * @param The SAX1 attribute list (with qnames).
	 */
	void setAttributeList (AttributeList qAtts)
	{
	    this.qAtts = qAtts;
	}


	/**
	 * Return the length of the attribute list.
	 *
	 * @return The number of attributes in the list.
	 * @see org.xml.sax.Attributes#getLength
	 */
	public int getLength ()
	{
	    return qAtts.getLength();
	}


	/**
	 * Return the Namespace URI of the specified attribute.
	 *
	 * @param The attribute's index.
	 * @return Always the empty string.
	 * @see org.xml.sax.Attributes#getURI
	 */
	public String getURI (int i)
	{
	    return "";
	}


	/**
	 * Return the local name of the specified attribute.
	 *
	 * @param The attribute's index.
	 * @return Always the empty string.
	 * @see org.xml.sax.Attributes#getLocalName
	 */
	public String getLocalName (int i)
	{
	    return "";
	}


	/**
	 * Return the qualified (prefixed) name of the specified attribute.
	 *
	 * @param The attribute's index.
	 * @return The attribute's qualified name, internalized.
	 */
	public String getQName (int i)
	{
	    return qAtts.getName(i).intern();
	}


	/**
	 * Return the type of the specified attribute.
	 *
	 * @param The attribute's index.
	 * @return The attribute's type as an internalized string.
	 */
	public String getType (int i)
	{
	    return qAtts.getType(i).intern();
	}


	/**
	 * Return the value of the specified attribute.
	 *
	 * @param The attribute's index.
	 * @return The attribute's value.
	 */
	public String getValue (int i)
	{
	    return qAtts.getValue(i);
	}


	/**
	 * Look up an attribute index by Namespace name.
	 *
	 * @param uri The Namespace URI or the empty string.
	 * @param localName The local name.
	 * @return The attributes index, or -1 if none was found.
	 * @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
	 */
	public int getIndex (String uri, String localName)
	{
	    return -1;
	}


	/**
	 * Look up an attribute index by qualified (prefixed) name.
	 *
	 * @param qName The qualified name.
	 * @return The attributes index, or -1 if none was found.
	 * @see org.xml.sax.Attributes#getIndex(java.lang.String)
	 */
	public int getIndex (String qName)
	{
	    int max = atts.getLength();
	    for (int i = 0; i < max; i++) {
		if (qAtts.getName(i).equals(qName)) {
		    return i;
		}
	    }
	    return -1;
	}


	/**
	 * Look up the type of an attribute by Namespace name.
	 *
	 * @param uri The Namespace URI
	 * @param localName The local name.
	 * @return The attribute's type as an internalized string.
	 */
	public String getType (String uri, String localName)
	{
	    return null;
	}


	/**
	 * Look up the type of an attribute by qualified (prefixed) name.
	 *
	 * @param qName The qualified name.
	 * @return The attribute's type as an internalized string.
	 */
	public String getType (String qName)
	{
	    return qAtts.getType(qName).intern();
	}


	/**
	 * Look up the value of an attribute by Namespace name.
	 *
	 * @param uri The Namespace URI
	 * @param localName The local name.
	 * @return The attribute's value.
	 */
	public String getValue (String uri, String localName)
	{
	    return null;
	}


	/**
	 * Look up the value of an attribute by qualified (prefixed) name.
	 *
	 * @param qName The qualified name.
	 * @return The attribute's value.
	 */
	public String getValue (String qName)
	{
	    return qAtts.getValue(qName);
	}

	private AttributeList qAtts;
    }
}

// end of ParserAdapter.java