JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.xml.sax.ext;

import org.xml.sax.SAXException;

/**
 * SAX2 extension handler for lexical events.
 *
 * <p>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.</p>
 *
 * <p>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.</p>
 *
 * <p>To set the LexicalHandler for an XML reader, use the
 * {@link org.xml.sax.XMLReader#setProperty setProperty} method
 * with the property name
 * <code>http://xml.org/sax/properties/lexical-handler</code>
 * 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.</p>
 *
 * @since 1.4, SAX 2.0 (extensions 1.0)
 * @author David Megginson
 */
public interface LexicalHandler
{

    /**
     * Report the start of DTD declarations, if any.
     *
     * <p>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.</p>
     *
     * <p>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.</p>
     *
     * <p>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.</p>
     *
     * @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.
     *
     * <p>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.</p>
     *
     * @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.
     *
     * <p>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
     * <code
     * >http://xml.org/sax/features/lexical-handler/parameter-entities</code>
     * feature to query or control the reporting of parameter entities.</p>
     *
     * <p>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]".</p>
     *
     * <p>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.</p>
     *
     * <p>Note that skipped entities will be reported through the
     * {@link org.xml.sax.ContentHandler#skippedEntity skippedEntity}
     * event, which is part of the ContentHandler interface.</p>
     *
     * <p>Because of the streaming event model that SAX uses, some
     * entity boundaries cannot be reported under any
     * circumstances:</p>
     *
     * <ul>
     * <li>general entities within attribute values</li>
     * <li>parameter entities within declarations</li>
     * </ul>
     *
     * <p>These will be silently expanded, with no indication of where
     * the original entity boundaries were.</p>
     *
     * <p>Note also that the boundaries of character references (which
     * are not really entities anyway) are not reported.</p>
     *
     * <p>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.
     *
     * <p>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.</p>
     *
     * @exception SAXException The application may raise an exception.
     * @see #endCDATA
     */
    public abstract void startCDATA ()
        throws SAXException;


    /**
     * Report the end of a CDATA section.
     *

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