nz.net.orcon.kanban.tools.DateInterpreter.java Source code

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Here is the source code for nz.net.orcon.kanban.tools.DateInterpreter.java

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/**
 * GRAVITY WORKFLOW AUTOMATION
 * (C) Copyright 2015 Orcon Limited
 * 
 * This file is part of Gravity Workflow Automation.
 *
 * Gravity Workflow Automation is free software: you can redistribute it 
 * and/or modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * Gravity Workflow Automation 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 for more details.
 *    
 * You should have received a copy of the GNU General Public License
 * along with Gravity Workflow Automation.  
 * If not, see <http://www.gnu.org/licenses/>. 
 */

package nz.net.orcon.kanban.tools;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DateInterpreter {

    private static final String TODAY_DESCRIPTIOR = "today";

    private static final Logger LOG = LoggerFactory.getLogger(DateInterpreter.class);

    private List<ComplexDateConverter> complexDateConverters;

    public boolean isDateFormula(String formula) {
        if (!isSimpleTodayExpression(formula)) {
            if (!isComplexDateFormula(formula)) {
                return false;
            }
        }
        return true;
    }

    private boolean isComplexDateFormula(String formula) {
        for (ComplexDateConverter complexDateConverter : complexDateConverters) {
            if (complexDateConverter.matches(formula)) {
                return true;
            }
        }
        return false;
    }

    public Date interpretDateFormula(String formula) {
        if (isSimpleTodayExpression(formula)) {
            return createTodayDateWithZeroTime();
        }
        return interpretComplexFormula(formula);
    }

    private Date interpretComplexFormula(String formula) {
        for (ComplexDateConverter complexDateConverter : complexDateConverters) {
            if (complexDateConverter.matches(formula)) {
                return complexDateConverter.convert(formula);
            }
        }
        return null;
    }

    public Date convertToZeroTimeDate(Date dateIn) {
        try {
            final SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
            return sdf.parse(sdf.format(dateIn));
        } catch (ParseException e) {
            LOG.error(
                    "Simple Date Format exception that should not occur, dates are being created with hour, minutes and seconds that shouldn't be.",
                    e);
        }
        return new Date();
    }

    public Date createTodayDateWithZeroTime() {
        return convertToZeroTimeDate(new Date());
    }

    public boolean isSimpleTodayExpression(String expressionIn) {
        return TODAY_DESCRIPTIOR.equalsIgnoreCase(StringUtils.trim(expressionIn));
    }

    public void setComplexDateConverters(List<ComplexDateConverter> complexDateConverters) {
        this.complexDateConverters = complexDateConverters;
    }
}