com.the.todo.parser.DateAndTimeParser.java Source code

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Here is the source code for com.the.todo.parser.DateAndTimeParser.java

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/**
 * This file is part of TheTODO, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2014 TheTODO
 * Copyright (c) Poh Wei Cheng <calvinpohwc@gmail.com>
 *             Chen Kai Hsiang <kaihsiang95@gmail.com>
 *             Khin Wathan Aye <y.caiyun@gmail.com>
 *             Neo Eng Tai <neoengtai@gamil.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.the.todo.parser;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.DateTimeFormatterBuilder;
import org.joda.time.format.DateTimeParser;

import com.joestelmach.natty.DateGroup;
import com.the.todo.parser.exception.InvalidDateException;
import com.the.todo.util.StringUtil;

//@author A0111815R

public class DateAndTimeParser {

    private static final DateTimeFormatter YEAR_MONTH_DAY_SLASH = DateTimeFormat.forPattern("yyyy/MM/dd");
    private static final DateTimeFormatter DAY_MONTH_YEAR_SLASH = DateTimeFormat.forPattern("dd/MM/yyyy");
    private static final DateTimeFormatter DAY_MONTH_YEAR_DASH = DateTimeFormat.forPattern("dd-MM-yyyy");

    private static final DateTimeParser[] DATE_TIME_PARSERS = { DAY_MONTH_YEAR_SLASH.getParser(),
            DAY_MONTH_YEAR_DASH.getParser() };
    private static final DateTimeFormatter DATE_TIME_FORMATTER = new DateTimeFormatterBuilder()
            .append(null, DATE_TIME_PARSERS).toFormatter();

    /**
     * 
     * 
     * 
     * @param input - String that is entered by the user.
     * @return - a list of date that is entered by the user.
     * @throws InvalidDateException - invalid date.
     */
    public static List<DateGroup> parse(String input) throws InvalidDateException {
        if (!checkValidDates(input)) {
            throw new InvalidDateException();
        }

        String formattedInput = changeDateStringsFormat(input);
        formattedInput = removeAllIntegers(formattedInput);
        formattedInput = formattedInput.replaceAll("([A-Za-z]+\\d+)", "");

        NattyParserWrapper prettyTime = NattyParserWrapper.getInstance();

        List<DateGroup> groups = prettyTime.parseDateOnly(formattedInput);
        List<DateGroup> newGroups = new ArrayList<DateGroup>();
        for (DateGroup group : groups) {
            String matchingValue = group.getText();
            String regex = ".*\\b" + matchingValue + "\\b.*"; // TODO: Not sure this is useful (KIV).

            if (formattedInput.matches(regex)) {
                newGroups.add(group);
            }
        }

        return newGroups;
    }

    private static String removeAllIntegers(String input) {
        String output = input;
        String[] tokens = StringUtil.splitString(input, " ");

        for (String token : tokens) {
            try {
                Integer.parseInt(token);
                output = output.replaceFirst(token, "");
            } catch (NumberFormatException ex) {
            }
        }

        return output;
    }

    public static boolean checkValidDates(String input) {
        boolean isValid = true;
        Pattern pattern = Pattern.compile("(?:\\d*)?\\d+[/-](?:\\d*)?\\d+[/-](?:\\d*)?\\d+");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            String matchedDate = matcher.group();
            try {
                LocalDate.parse(matchedDate, DATE_TIME_FORMATTER);
            } catch (Exception e) {
                isValid = false;
                break;
            }
        }

        return isValid;
    }

    public static String changeDateStringsFormat(String input) {
        String formattedInput = input;
        Pattern pattern = Pattern.compile(
                "(?:(?:31(\\/|-|\\.)(?:0?[13578]|1[02]))\\1|(?:(?:29|30)(\\/|-|\\.)(?:0?[1,3-9]|1[0-2])\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})|\\b(?:29(\\/|-|\\.)0?2\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))|\\b(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.)(?:(?:0?[1-9])|(?:1[0-2]))\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            String matchedDate = matcher.group();
            LocalDate date = LocalDate.parse(matchedDate, DAY_MONTH_YEAR_SLASH);
            formattedInput = formattedInput.replace(matchedDate, date.toString(YEAR_MONTH_DAY_SLASH));
            System.out.println(formattedInput);
        }

        return formattedInput;
    }

}