This is an optional extension handler for SAX2 to provide * lexical information about an XML document, such as comments * and CDATA section boundaries. * XML readers are not required to recognize this handler, and it * is not part of core-only SAX2 distributions.
* *The events in the lexical handler apply to the entire document, * not just to the document element, and all lexical handler events * must appear between the content handler's startDocument and * endDocument events.
* *To set the LexicalHandler for an XML reader, use the
* {@link org.xml.sax.XMLReader#setProperty setProperty} method
* with the property name
* http://xml.org/sax/properties/lexical-handler
* and an object implementing this interface (or null) as the value.
* If the reader does not report lexical events, it will throw a
* {@link org.xml.sax.SAXNotRecognizedException SAXNotRecognizedException}
* when you attempt to register the handler.
This method is intended to report the beginning of the * DOCTYPE declaration; if the document has no DOCTYPE declaration, * this method will not be invoked.
* *All declarations reported through * {@link org.xml.sax.DTDHandler DTDHandler} or * {@link org.xml.sax.ext.DeclHandler DeclHandler} events must appear * between the startDTD and {@link #endDTD endDTD} events. * Declarations are assumed to belong to the internal DTD subset * unless they appear between {@link #startEntity startEntity} * and {@link #endEntity endEntity} events. Comments and * processing instructions from the DTD should also be reported * between the startDTD and endDTD events, in their original * order of (logical) occurrence; they are not required to * appear in their correct locations relative to DTDHandler * or DeclHandler events, however.
* *Note that the start/endDTD events will appear within * the start/endDocument events from ContentHandler and * before the first * {@link org.xml.sax.ContentHandler#startElement startElement} * event.
* * @param name The document type name. * @param publicId The declared public identifier for the * external DTD subset, or null if none was declared. * @param systemId The declared system identifier for the * external DTD subset, or null if none was declared. * (Note that this is not resolved against the document * base URI.) * @throws SAXException The application may raise an * exception. * @see #endDTD * @see #startEntity */ public abstract void startDTD (String name, String publicId, String systemId) throws SAXException; /** * Report the end of DTD declarations. * *This method is intended to report the end of the * DOCTYPE declaration; if the document has no DOCTYPE declaration, * this method will not be invoked.
* * @throws SAXException The application may raise an exception. * @see #startDTD */ public abstract void endDTD () throws SAXException; /** * Report the beginning of some internal and external XML entities. * *The reporting of parameter entities (including
* the external DTD subset) is optional, and SAX2 drivers that
* report LexicalHandler events may not implement it; you can use the
* http://xml.org/sax/features/lexical-handler/parameter-entities
* feature to query or control the reporting of parameter entities.
General entities are reported with their regular names, * parameter entities have '%' prepended to their names, and * the external DTD subset has the pseudo-entity name "[dtd]".
* *When a SAX2 driver is providing these events, all other * events must be properly nested within start/end entity * events. There is no additional requirement that events from * {@link org.xml.sax.ext.DeclHandler DeclHandler} or * {@link org.xml.sax.DTDHandler DTDHandler} be properly ordered.
* *Note that skipped entities will be reported through the * {@link org.xml.sax.ContentHandler#skippedEntity skippedEntity} * event, which is part of the ContentHandler interface.
* *Because of the streaming event model that SAX uses, some * entity boundaries cannot be reported under any * circumstances:
* *These will be silently expanded, with no indication of where * the original entity boundaries were.
* *Note also that the boundaries of character references (which * are not really entities anyway) are not reported.
* *All start/endEntity events must be properly nested. * * @param name The name of the entity. If it is a parameter * entity, the name will begin with '%', and if it is the * external DTD subset, it will be "[dtd]". * @throws SAXException The application may raise an exception. * @see #endEntity * @see org.xml.sax.ext.DeclHandler#internalEntityDecl * @see org.xml.sax.ext.DeclHandler#externalEntityDecl */ public abstract void startEntity (String name) throws SAXException; /** * Report the end of an entity. * * @param name The name of the entity that is ending. * @throws SAXException The application may raise an exception. * @see #startEntity */ public abstract void endEntity (String name) throws SAXException; /** * Report the start of a CDATA section. * *
The contents of the CDATA section will be reported through * the regular {@link org.xml.sax.ContentHandler#characters * characters} event; this event is intended only to report * the boundary.
* * @throws SAXException The application may raise an exception. * @see #endCDATA */ public abstract void startCDATA () throws SAXException; /** * Report the end of a CDATA section. * * @throws SAXException The application may raise an exception. * @see #startCDATA */ public abstract void endCDATA () throws SAXException; /** * Report an XML comment anywhere in the document. * *This callback will be used for comments inside or outside the * document element, including comments in the external DTD * subset (if read). Comments in the DTD must be properly * nested inside start/endDTD and start/endEntity events (if * used).
* * @param ch An array holding the characters in the comment. * @param start The starting position in the array. * @param length The number of characters to use from the array. * @throws SAXException The application may raise an exception. */ public abstract void comment (char ch[], int start, int length) throws SAXException; } // end of LexicalHandler.java