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 * Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package org.xml.sax.ext;

import org.xml.sax.Locator;


/**
 * SAX2 extension to augment the entity information provided
 * through a {@link Locator}.
 * If an implementation supports this extension, the Locator
 * provided in {@link org.xml.sax.ContentHandler#setDocumentLocator
 * ContentHandler.setDocumentLocator() } will implement this
 * interface, and the
 * <em>http://xml.org/sax/features/use-locator2</em> feature
 * flag will have the value <em>true</em>.
 *
 * <p> XMLReader implementations are not required to support this
 * information, and it is not part of core-only SAX2 distributions.</p>
 *
 * @since 1.5, SAX 2.0 (extensions 1.1 alpha)
 * @author David Brownell
 */
public interface Locator2 extends Locator
{
    /**
     * Returns the version of XML used for the entity.  This will
     * normally be the identifier from the current entity's
     * <em>&lt;?xml&nbsp;version='...'&nbsp;...?&gt;</em> declaration,
     * or be defaulted by the parser.
     *
     * @return Identifier for the XML version being used to interpret
     * the entity's text, or null if that information is not yet
     * available in the current parsing state.
     */
    public String getXMLVersion ();

    /**
     * Returns the name of the character encoding for the entity.
     * If the encoding was declared externally (for example, in a MIME
     * Content-Type header), that will be the name returned.  Else if there
     * was an <em>&lt;?xml&nbsp;...encoding='...'?&gt;</em> declaration at
     * the start of the document, that encoding name will be returned.
     * Otherwise the encoding will been inferred (normally to be UTF-8, or
     * some UTF-16 variant), and that inferred name will be returned.
     *
     * <p>When an {@link org.xml.sax.InputSource InputSource} is used
     * to provide an entity's character stream, this method returns the
     * encoding provided in that input stream.
     *
     * <p> Note that some recent W3C specifications require that text
     * in some encodings be normalized, using Unicode Normalization
     * Form C, before processing.  Such normalization must be performed
     * by applications, and would normally be triggered based on the
     * value returned by this method.
     *
     * <p> Encoding names may be those used by the underlying JVM,
     * and comparisons should be case-insensitive.
     *
     * @return Name of the character encoding being used to interpret
     * * the entity's text, or null if this was not provided for a *
     * character stream passed through an InputSource or is otherwise
     * not yet available in the current parsing state.
     */
    public String getEncoding ();
}