+ * This module, both source code and documentation, is in the + * Public Domain, and comes with NO WARRANTY. + * See http://www.saxproject.org + * for further information. + *+ * + *
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.) + * @exception 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.
+ * + * @exception 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]". + * @exception 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. + * @exception 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.
+ * + * @exception SAXException The application may raise an exception. + * @see #endCDATA + */ + public abstract void startCDATA () + throws SAXException; + + + /** + * Report the end of a CDATA section. + * + * @exception 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. + * @exception SAXException The application may raise an exception. + */ + public abstract void comment (char ch[], int start, int length) + throws SAXException; + +} + +// end of LexicalHandler.java