/*
* Copyright (c) 2000, 2005, 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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*/
// SAX locator interface for document events.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: Locator.java,v 1.2 2004/11/03 22:55:32 jsuttor Exp $
package org.xml.sax;
/**
* Interface for associating a SAX event with a document location.
*
* <blockquote>
* <em>This module, both source code and documentation, is in the
* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
* See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
* for further information.
* </blockquote>
*
* <p>If a SAX parser provides location information to the SAX
* application, it does so by implementing this interface and then
* passing an instance to the application using the content
* handler's {@link org.xml.sax.ContentHandler#setDocumentLocator
* setDocumentLocator} method. The application can use the
* object to obtain the location of any other SAX event
* in the XML source document.</p>
*
* <p>Note that the results returned by the object will be valid only
* during the scope of each callback method: the application
* will receive unpredictable results if it attempts to use the
* locator at any other time, or after parsing completes.</p>
*
* <p>SAX parsers are not required to supply a locator, but they are
* very strongly encouraged to do so. If the parser supplies a
* locator, it must do so before reporting any other document events.
* If no locator has been set by the time the application receives
* the {@link org.xml.sax.ContentHandler#startDocument startDocument}
* event, the application should assume that a locator is not
* available.</p>
*
* @since SAX 1.0
* @author David Megginson
* @see org.xml.sax.ContentHandler#setDocumentLocator
*/
public interface Locator {
/**
* Return the public identifier for the current document event.
*
* <p>The return value is the public identifier of the document
* entity or of the external parsed entity in which the markup
* triggering the event appears.</p>
*
* @return A string containing the public identifier, or
* null if none is available.
* @see #getSystemId
*/
public abstract String getPublicId ();
/**
* Return the system identifier for the current document event.
*
* <p>The return value is the system identifier of the document
* entity or of the external parsed entity in which the markup
* triggering the event appears.</p>
*
* <p>If the system identifier is a URL, the parser must resolve it
* fully before passing it to the application. For example, a file
* name must always be provided as a <em>file:...</em> URL, and other
* kinds of relative URI are also resolved against their bases.</p>
*
* @return A string containing the system identifier, or null
* if none is available.
* @see #getPublicId
*/
public abstract String getSystemId ();
/**
* Return the line number where the current document event ends.
* Lines are delimited by line ends, which are defined in
* the XML specification.
*
* <p><strong>Warning:</strong> The return value from the method
* is intended only as an approximation for the sake of diagnostics;
* it is not intended to provide sufficient information
* to edit the character content of the original XML document.
* In some cases, these "line" numbers match what would be displayed
* as columns, and in others they may not match the source text
* due to internal entity expansion. </p>
*
* <p>The return value is an approximation of the line number
* in the document entity or external parsed entity where the
* markup triggering the event appears.</p>
*
* <p>If possible, the SAX driver should provide the line position
* of the first character after the text associated with the document
* event. The first line is line 1.</p>
*
* @return The line number, or -1 if none is available.
* @see #getColumnNumber
*/
public abstract int getLineNumber ();
/**
* Return the column number where the current document event ends.
* This is one-based number of Java <code>char</code> values since
* the last line end.
*
* <p><strong>Warning:</strong> The return value from the method
* is intended only as an approximation for the sake of diagnostics;
* it is not intended to provide sufficient information
* to edit the character content of the original XML document.
* For example, when lines contain combining character sequences, wide
* characters, surrogate pairs, or bi-directional text, the value may
* not correspond to the column in a text editor's display. </p>
*
* <p>The return value is an approximation of the column number
* in the document entity or external parsed entity where the
* markup triggering the event appears.</p>
*
* <p>If possible, the SAX driver should provide the line position
* of the first character after the text associated with the document
* event. The first column in each line is column 1.</p>
*
* @return The column number, or -1 if none is available.
* @see #getLineNumber
*/
public abstract int getColumnNumber ();
}
// end of Locator.java