/*

 * Copyright (c) 1996, 2021, 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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/*

 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved

 * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved

 *

 *   The original version of this source code and documentation is copyrighted

 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These

 * materials are provided under terms of a License Agreement between Taligent

 * and Sun. This technology is protected by multiple US and International

 * patents. This notice and attribution to Taligent may not be removed.

 *   Taligent is a registered trademark of Taligent, Inc.

 *

 */

package java.text;

/**

 * {@code ParsePosition} is a simple class used by {@code Format}

 * and its subclasses to keep track of the current position during parsing.

 * The {@code parseObject} method in the various {@code Format}

 * classes requires a {@code ParsePosition} object as an argument.

 *

 * <p>

 * By design, as you parse through a string with different formats,

 * you can use the same {@code ParsePosition}, since the index parameter

 * records the current position.

 *

 * @author      Mark Davis

 * @since 1.1

 * @see         java.text.Format

 */

public class ParsePosition {

    /**

     * Input: the place you start parsing.

     * <br>Output: position where the parse stopped.

     * This is designed to be used serially,

     * with each call setting index up for the next one.

     */

    int index = 0;

    int errorIndex = -1;

    /**

     * Retrieve the current parse position.  On input to a parse method, this

     * is the index of the character at which parsing will begin; on output, it

     * is the index of the character following the last character parsed.

     *

     * @return the current parse position

     */

    public int getIndex() {

        return index;

    }

    /**

     * Set the current parse position.

     *

     * @param index the current parse position

     */

    public void setIndex(int index) {

        this.index = index;

    }

    /**

     * Create a new ParsePosition with the given initial index.

     *

     * @param index initial index

     */

    public ParsePosition(int index) {

        this.index = index;

    }

    /**

     * Set the index at which a parse error occurred.  Formatters

     * should set this before returning an error code from their

     * parseObject method.  The default value is -1 if this is not set.

     *

     * @param ei the index at which an error occurred

     * @since 1.2

     */

    public void setErrorIndex(int ei)

    {

        errorIndex = ei;

    }

    /**

     * Retrieve the index at which an error occurred, or -1 if the

     * error index has not been set.

     *

     * @return the index at which an error occurred

     * @since 1.2

     */

    public int getErrorIndex()

    {

        return errorIndex;

    }

    /**

     * Overrides equals

     */

    public boolean equals(Object obj)

    {

        if (obj == null) return false;

        if (!(obj instanceof ParsePosition other))

            return false;

        return (index == other.index && errorIndex == other.errorIndex);

    }

    /**

     * Returns a hash code for this ParsePosition.

     * @return a hash code value for this object

     */

    public int hashCode() {

        return (errorIndex << 16) | index;

    }

    /**

     * Return a string representation of this ParsePosition.

     * @return  a string representation of this object

     */

    public String toString() {

        return getClass().getName() +

            "[index=" + index +

            ",errorIndex=" + errorIndex + ']';

    }

}