Package com.webmethods.rtl.markup.xml.parser

Class BaseParser

java.lang.Object
com.webmethods.rtl.markup.xml.parser.BaseParser
All Implemented Interfaces:
XMLReader
Direct Known Subclasses:
BaseFilter, HTMLParser
public abstract class BaseParser extends Object implements XMLReader
Base SAX Parser. Only one thread at a time may use this parser.

  • Field Details

  • Constructor Details

    • BaseParser

      public BaseParser()

  • Method Details

    • getFeature

      public boolean getFeature(String name) throws SAXNotRecognizedException, SAXNotSupportedException
      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:

    • setFeature

      public void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException
      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:

    • getProperty

      public Object getProperty(String name) throws SAXNotRecognizedException, SAXNotSupportedException
      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:

    • setProperty

      public void setProperty(String name, Object value) throws SAXNotRecognizedException, SAXNotSupportedException
      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)
      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:

    • getEntityResolver

      public EntityResolver getEntityResolver()
      Return the current entity resolver.
      Specified by:
      getEntityResolver in interface XMLReader
      Returns:
      The current entity resolver, or null if none has been registered.
      See Also:

    • setDTDHandler

      public void setDTDHandler(DTDHandler handler)
      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:
      handler - The DTD handler.
      See Also:

    • getDTDHandler

      public DTDHandler getDTDHandler()
      Return the current DTD handler.
      Specified by:
      getDTDHandler in interface XMLReader
      Returns:
      The current DTD handler, or null if none has been registered.
      See Also:

    • setContentHandler

      public void setContentHandler(ContentHandler handler)
      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:

    • getContentHandler

      public ContentHandler getContentHandler()
      Return the current content handler.
      Specified by:
      getContentHandler in interface XMLReader
      Returns:
      The current content handler, or null if none has been registered.
      See Also:

    • setErrorHandler

      public void setErrorHandler(ErrorHandler handler)
      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:

    • getErrorHandler

      public ErrorHandler getErrorHandler()
      Return the current error handler.
      Specified by:
      getErrorHandler in interface XMLReader
      Returns:
      The current error handler, or null if none has been registered.
      See Also:

    • parse

      public void parse(String systemId) throws IOException, SAXException
      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:
      SAXException - Any SAX exception, possibly wrapping another exception.
      IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.
      See Also:

    • getCharacterStream

      protected Reader getCharacterStream(InputSource input) throws IOException, SAXException
      Throws:
      IOException
      SAXException