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 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
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 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.logging.log4j.core.util.datetime;

import java.text.ParseException;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

DateParser is the "missing" interface for the parsing methods of DateFormat. You can obtain an object implementing this interface by using one of the FastDateFormat factory methods. 

Warning: Since binary compatible methods may be added to this interface in any
release, developers are not expected to implement this interface.

Copied and modified from Apache Commons Lang.

Since:
Apache Commons Lang 3.2/**
 * DateParser is the "missing" interface for the parsing methods of
 * {@link java.text.DateFormat}. You can obtain an object implementing this
 * interface by using one of the FastDateFormat factory methods.
 * <p>
 * Warning: Since binary compatible methods may be added to this interface in any
 * release, developers are not expected to implement this interface.
 *
 * <p>
 * Copied and modified from <a href="https://commons.apache.org/proper/commons-lang/">Apache Commons Lang</a>.
 * </p>
 *
 * @since Apache Commons Lang 3.2
 */
public interface DateParser {

    
Equivalent to DateFormat.parse(String). See DateFormat.parse(String) for more information. 
Params:
source – A String whose beginning should be parsed.
Throws:
ParseException – if the beginning of the specified string cannot be parsed.
Returns:
A Date parsed from the string/**
     * Equivalent to DateFormat.parse(String).
     *
     * See {@link java.text.DateFormat#parse(String)} for more information.
     * @param source A <code>String</code> whose beginning should be parsed.
     * @return A <code>Date</code> parsed from the string
     * @throws ParseException if the beginning of the specified string cannot be parsed.
     */
    Date parse(String source) throws ParseException;

    
Equivalent to DateFormat.parse(String, ParsePosition). See DateFormat.parse(String, ParsePosition) for more information. 
Params:
source – A String, part of which should be parsed.
pos – A ParsePosition object with index and error index information
as described above.
Throws:
NullPointerException – if text or pos is null.
Returns:
A Date parsed from the string. In case of error, returns null./**
     * Equivalent to DateFormat.parse(String, ParsePosition).
     *
     * See {@link java.text.DateFormat#parse(String, ParsePosition)} for more information.
     *
     * @param source A <code>String</code>, part of which should be parsed.
     * @param pos A <code>ParsePosition</code> object with index and error index information
     * as described above.
     * @return A <code>Date</code> parsed from the string. In case of error, returns null.
     * @throws NullPointerException if text or pos is null.
     */
    Date parse(String source, ParsePosition pos);

    
Parses a formatted date string according to the format.  Updates the Calendar with parsed fields.
Upon success, the ParsePosition index is updated to indicate how much of the source text was consumed.
Not all source text needs to be consumed.  Upon parse failure, ParsePosition error index is updated to
the offset of the source text which does not match the supplied format.
Params:
source – The text to parse.
pos – On input, the position in the source to start parsing, on output, updated position.
calendar – The calendar into which to set parsed fields.
Throws:
IllegalArgumentException – when Calendar has been set to be not lenient, and a parsed field is
out of range.
Returns:
true, if source has been parsed (pos parsePosition is updated); otherwise false (and pos errorIndex is updated)
Since:
3.5/**
     * Parses a formatted date string according to the format.  Updates the Calendar with parsed fields.
     * Upon success, the ParsePosition index is updated to indicate how much of the source text was consumed.
     * Not all source text needs to be consumed.  Upon parse failure, ParsePosition error index is updated to
     * the offset of the source text which does not match the supplied format.
     *
     * @param source The text to parse.
     * @param pos On input, the position in the source to start parsing, on output, updated position.
     * @param calendar The calendar into which to set parsed fields.
     * @return true, if source has been parsed (pos parsePosition is updated); otherwise false (and pos errorIndex is updated)
     * @throws IllegalArgumentException when Calendar has been set to be not lenient, and a parsed field is
     * out of range.
     *
     * @since 3.5
     */
    boolean parse(String source, ParsePosition pos, Calendar calendar);

    // Accessors
    //-----------------------------------------------------------------------
    
Gets the pattern used by this parser.
Returns:
the pattern, SimpleDateFormat compatible/**
     * <p>Gets the pattern used by this parser.</p>
     *
     * @return the pattern, {@link java.text.SimpleDateFormat} compatible
     */
    String getPattern();

    

Gets the time zone used by this parser.

 The default TimeZone used to create a Date when the TimeZone is not specified by the format pattern. 
Returns:
the time zone/**
     * <p>
     * Gets the time zone used by this parser.
     * </p>
     *
     * <p>
     * The default {@link TimeZone} used to create a {@link Date} when the {@link TimeZone} is not specified by
     * the format pattern.
     * </p>
     *
     * @return the time zone
     */
    TimeZone getTimeZone();

    
Gets the locale used by this parser.
Returns:
the locale/**
     * <p>Gets the locale used by this parser.</p>
     *
     * @return the locale
     */
    Locale getLocale();

    
Parses text from a string to produce a Date.
Params:
source – A String whose beginning should be parsed.
Throws:
ParseException – if the beginning of the specified string cannot be parsed.
See Also:
Format.parseObject(String)
Returns:
a java.util.Date object/**
     * Parses text from a string to produce a Date.
     *
     * @param source A <code>String</code> whose beginning should be parsed.
     * @return a <code>java.util.Date</code> object
     * @throws ParseException if the beginning of the specified string cannot be parsed.
     * @see java.text.DateFormat#parseObject(String)
     */
    Object parseObject(String source) throws ParseException;

    
Parses a date/time string according to the given parse position.
Params:
source – A String whose beginning should be parsed.
pos – the parse position
See Also:
DateFormat.parseObject(String, ParsePosition)
Returns:
a java.util.Date object/**
     * Parses a date/time string according to the given parse position.
     *
     * @param source A <code>String</code> whose beginning should be parsed.
     * @param pos the parse position
     * @return a <code>java.util.Date</code> object
     * @see java.text.DateFormat#parseObject(String, ParsePosition)
     */
    Object parseObject(String source, ParsePosition pos);
}