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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package javax.json.stream;

/**
 * Provides the location information of a JSON event in an input source. The
 * {@code JsonLocation} information can be used to identify incorrect JSON
 * or can be used by higher frameworks to know about the processing location.
 *
 * <EMBED CLASS='external-html' DATA-FILE-ID=LICENSE DATA-CIETName=JsonLocation>
 * 
 * <BR /><BR />All the information provided by a {@code JsonLocation} is optional. For
 * example, a provider may only report line numbers. Also, there may not be any
 * location information for an input source. For example, if a
 * {@code JsonParser} is created using
 * {@link javax.json.JsonArray JsonArray} input source, all the methods in
 * this class return -1.
 * 
 * @see JsonParser
 * @see JsonParsingException
 */
public interface JsonLocation {

    /**
     * Return the line number (starts with 1 for the first line) for the current JSON event in the input source.
     *
     * @return the line number (starts with 1 for the first line) or -1 if none is available
     */
    long getLineNumber();

    /**
     * Return the column number (starts with 1 for the first column) for the current JSON event in the input source.
     *
     * @return the column number (starts with 1 for the first column) or -1 if none is available
     */
    long getColumnNumber();

    /**
     * Return the stream 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 offset of input source stream, or -1 if there is
     * no offset available
     */
    long getStreamOffset();

}