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/*
 * Copyright (c) 2009, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.xml.stream;

/**
 * Provides information on the location of an event.
 *
 * All the information provided by a Location is optional.  For example
 * an application may only report line numbers.
 *
 * @version 1.0
 * @author Copyright (c) 2009 by Oracle Corporation. All Rights Reserved.
 * @since 1.6
 */
public interface Location {
  /**
   * Return the line number where the current event ends,
   * returns -1 if none is available.
   * @return the current line number
   */
  int getLineNumber();

  /**
   * Return the column number where the current event ends,
   * returns -1 if none is available.
   * @return the current column number
   */
  int getColumnNumber();

  /**
   * Return the byte or character offset into the input source this location
   * is pointing to. If the input source is a file or a byte stream then
   * this is the byte offset into that stream, but if the input source is
   * a character media then the offset is the character offset.
   * Returns -1 if there is no offset available.
   * @return the current offset
   */
  int getCharacterOffset();

  /**
   * Returns the public ID of the XML
   * @return the public ID, or null if not available
   */
  public String getPublicId();

  /**
   * Returns the system ID of the XML
   * @return the system ID, or null if not available
   */
  public String getSystemId();
}