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ExpatReader


org.apache.harmony.xml

Class ExpatReader

  • All Implemented Interfaces:
    XMLReader


    public class ExpatReader
    extends Object
    implements XMLReader
    SAX wrapper around Expat. Interns strings. Does not support validation. Does not support DTDHandler.
    • Constructor Detail

      • ExpatReader

        public ExpatReader()
    • Method Detail

      • getFeature

        public boolean getFeature(String name)
                           throws SAXNotRecognizedException,
                                  SAXNotSupportedException
        Description copied from interface: XMLReader
        Look up the value of a feature flag.

        The feature name is any fully-qualified URI. It is possible for an XMLReader to recognize a feature name but temporarily be unable to return its value. Some feature values may be available only in specific contexts, such as before, during, or after a parse. Also, some feature values may not be programmatically accessible. (In the case of an adapter for SAX1 Parser, there is no implementation-independent way to expose whether the underlying parser is performing validation, expanding external entities, and so forth.)

        All XMLReaders are required to recognize the http://xml.org/sax/features/namespaces and the http://xml.org/sax/features/namespace-prefixes feature names.

        Typical usage is something like this:

         XMLReader r = new MySAXDriver();
        
                                 // try to activate validation
         try {
           r.setFeature("http://xml.org/sax/features/validation", true);
         } catch (SAXException e) {
           System.err.println("Cannot activate validation.");
         }
        
                                 // register event handlers
         r.setContentHandler(new MyContentHandler());
         r.setErrorHandler(new MyErrorHandler());
        
                                 // parse the first document
         try {
           r.parse("http://www.foo.com/mydoc.xml");
         } catch (IOException e) {
           System.err.println("I/O exception reading XML document");
         } catch (SAXException e) {
           System.err.println("XML exception reading document.");
         }
         

        Implementors are free (and encouraged) to invent their own features, using names built on their own URIs.

        Specified by:
        getFeature in interface XMLReader
        Parameters:
        name - The feature name, which is a fully-qualified URI.
        Returns:
        The current value of the feature (true or false).
        Throws:
        SAXNotRecognizedException - If the feature value can't be assigned or retrieved.
        SAXNotSupportedException - When the XMLReader recognizes the feature name but cannot determine its value at this time.
        See Also:
        XMLReader.setFeature(java.lang.String, boolean)
      • setFeature

        public void setFeature(String name,
                      boolean value)
                        throws SAXNotRecognizedException,
                               SAXNotSupportedException
        Description copied from interface: XMLReader
        Set the value of a feature flag.

        The feature name is any fully-qualified URI. It is possible for an XMLReader to expose a feature value but to be unable to change the current value. Some feature values may be immutable or mutable only in specific contexts, such as before, during, or after a parse.

        All XMLReaders are required to support setting http://xml.org/sax/features/namespaces to true and http://xml.org/sax/features/namespace-prefixes to false.

        Specified by:
        setFeature in interface XMLReader
        Parameters:
        name - The feature name, which is a fully-qualified URI.
        value - The requested value of the feature (true or false).
        Throws:
        SAXNotRecognizedException - If the feature value can't be assigned or retrieved.
        SAXNotSupportedException - When the XMLReader recognizes the feature name but cannot set the requested value.
        See Also:
        XMLReader.getFeature(java.lang.String)
      • getProperty

        public Object getProperty(String name)
                           throws SAXNotRecognizedException,
                                  SAXNotSupportedException
        Description copied from interface: XMLReader
        Look up the value of a property.

        The property name is any fully-qualified URI. It is possible for an XMLReader to recognize a property name but temporarily be unable to return its value. Some property values may be available only in specific contexts, such as before, during, or after a parse.

        XMLReaders are not required to recognize any specific property names, though an initial core set is documented for SAX2.

        Implementors are free (and encouraged) to invent their own properties, using names built on their own URIs.

        Specified by:
        getProperty in interface XMLReader
        Parameters:
        name - The property name, which is a fully-qualified URI.
        Returns:
        The current value of the property.
        Throws:
        SAXNotRecognizedException - If the property value can't be assigned or retrieved.
        SAXNotSupportedException - When the XMLReader recognizes the property name but cannot determine its value at this time.
        See Also:
        XMLReader.setProperty(java.lang.String, java.lang.Object)
      • setProperty

        public void setProperty(String name,
                       Object value)
                         throws SAXNotRecognizedException,
                                SAXNotSupportedException
        Description copied from interface: XMLReader
        Set the value of a property.

        The property name is any fully-qualified URI. It is possible for an XMLReader to recognize a property name but to be unable to change the current value. Some property values may be immutable or mutable only in specific contexts, such as before, during, or after a parse.

        XMLReaders are not required to recognize setting any specific property names, though a core set is defined by SAX2.

        This method is also the standard mechanism for setting extended handlers.

        Specified by:
        setProperty in interface XMLReader
        Parameters:
        name - The property name, which is a fully-qualified URI.
        value - The requested value for the property.
        Throws:
        SAXNotRecognizedException - If the property value can't be assigned or retrieved.
        SAXNotSupportedException - When the XMLReader recognizes the property name but cannot set the requested value.
      • setEntityResolver

        public void setEntityResolver(EntityResolver resolver)
        Description copied from interface: XMLReader
        Allow an application to register an entity resolver.

        If the application does not register an entity resolver, the XMLReader will perform its own default resolution.

        Applications may register a new or different resolver in the middle of a parse, and the SAX parser must begin using the new resolver immediately.

        Specified by:
        setEntityResolver in interface XMLReader
        Parameters:
        resolver - The entity resolver.
        See Also:
        XMLReader.getEntityResolver()
      • setDTDHandler

        public void setDTDHandler(DTDHandler dtdHandler)
        Description copied from interface: XMLReader
        Allow an application to register a DTD event handler.

        If the application does not register a DTD handler, all DTD events reported by the SAX parser will be silently ignored.

        Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

        Specified by:
        setDTDHandler in interface XMLReader
        Parameters:
        dtdHandler - The DTD handler.
        See Also:
        XMLReader.getDTDHandler()
      • setContentHandler

        public void setContentHandler(ContentHandler handler)
        Description copied from interface: XMLReader
        Allow an application to register a content event handler.

        If the application does not register a content handler, all content events reported by the SAX parser will be silently ignored.

        Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

        Specified by:
        setContentHandler in interface XMLReader
        Parameters:
        handler - The content handler.
        See Also:
        XMLReader.getContentHandler()
      • setErrorHandler

        public void setErrorHandler(ErrorHandler handler)
        Description copied from interface: XMLReader
        Allow an application to register an error event handler.

        If the application does not register an error handler, all error events reported by the SAX parser will be silently ignored; however, normal processing may not continue. It is highly recommended that all SAX applications implement an error handler to avoid unexpected bugs.

        Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

        Specified by:
        setErrorHandler in interface XMLReader
        Parameters:
        handler - The error handler.
        See Also:
        XMLReader.getErrorHandler()
      • setLexicalHandler

        public void setLexicalHandler(LexicalHandler lexicalHandler)
        Registers a lexical event handler. Supports neither LexicalHandler.startEntity(String) nor LexicalHandler.endEntity(String).

        If the application does not register a lexical handler, all lexical events reported by the SAX parser will be silently ignored.

        Applications may register a new or different handler in the middle of a parse, and the SAX parser must begin using the new handler immediately.

        Parameters:
        lexicalHandler - listens for lexical events
        See Also:
        getLexicalHandler()
      • parse

        public void parse(InputSource input)
                   throws IOException,
                          SAXException
        Description copied from interface: XMLReader
        Parse an XML document.

        The application can use this method to instruct the XML reader to begin parsing an XML document from any valid input source (a character stream, a byte stream, or a URI).

        Applications may not invoke this method while a parse is in progress (they should create a new XMLReader instead for each nested XML document). Once a parse is complete, an application may reuse the same XMLReader object, possibly with a different input source. Configuration of the XMLReader object (such as handler bindings and values established for feature flags and properties) is unchanged by completion of a parse, unless the definition of that aspect of the configuration explicitly specifies other behavior. (For example, feature flags or properties exposing characteristics of the document being parsed.)

        During the parse, the XMLReader will provide information about the XML document through the registered event handlers.

        This method is synchronous: it will not return until parsing has ended. If a client application wants to terminate parsing early, it should throw an exception.

        Specified by:
        parse in interface XMLReader
        Parameters:
        input - The input source for the top-level of the XML document.
        Throws:
        IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.
        SAXException - Any SAX exception, possibly wrapping another exception.
        See Also:
        InputSource, XMLReader.parse(java.lang.String), XMLReader.setEntityResolver(org.xml.sax.EntityResolver), XMLReader.setDTDHandler(org.xml.sax.DTDHandler), XMLReader.setContentHandler(org.xml.sax.ContentHandler), XMLReader.setErrorHandler(org.xml.sax.ErrorHandler)
      • parse

        public void parse(String systemId)
                   throws IOException,
                          SAXException
        Description copied from interface: XMLReader
        Parse an XML document from a system identifier (URI).

        This method is a shortcut for the common case of reading a document from a system identifier. It is the exact equivalent of the following:

         parse(new InputSource(systemId));
         

        If the system identifier is a URL, it must be fully resolved by the application before it is passed to the parser.

        Specified by:
        parse in interface XMLReader
        Parameters:
        systemId - The system identifier (URI).
        Throws:
        IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.
        SAXException - Any SAX exception, possibly wrapping another exception.
        See Also:
        XMLReader.parse(org.xml.sax.InputSource)


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