com.tasktop.c2c.server.common.web.client.widgets.time.TimePeriodParser.java Source code

Introduction

Here is the source code for com.tasktop.c2c.server.common.web.client.widgets.time.TimePeriodParser.java

Source

/*******************************************************************************
 * Copyright (c) 2010, 2012 Tasktop Technologies
 * Copyright (c) 2010, 2011 SpringSource, a division of VMware
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Tasktop Technologies - initial API and implementation
 ******************************************************************************/
package com.tasktop.c2c.server.common.web.client.widgets.time;

import java.math.BigDecimal;
import java.text.ParseException;

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
import com.google.gwt.text.shared.Parser;

/**
 * @author cmorgan (Tasktop Technologies Inc.)
 * 
 */
public class TimePeriodParser implements Parser<BigDecimal> {

    /** Parses strings and returns values in hours. If no units provided assumes units are hours. */
    public static TimePeriodParser DEFAULT_HOUR_IN_HOURS = new TimePeriodParser(TimePeriodUnit.HOURS,
            TimePeriodUnit.HOURS, TimePeriodUnit.DAYS, TimePeriodUnit.HOURS, TimePeriodUnit.MINUTES);
    /** Parses strings and returns values in hours. If no units provided assumes units are days. */
    public static TimePeriodParser DEFAULT_DAY_IN_HOURS = new TimePeriodParser(TimePeriodUnit.HOURS,
            TimePeriodUnit.DAYS, TimePeriodUnit.DAYS, TimePeriodUnit.HOURS, TimePeriodUnit.MINUTES);

    private TimePeriodUnit defaultUnit;
    private TimePeriodUnit returnUnit;
    private TimePeriodUnit[] supportedUnits;

    private static final RegExp DEFAULT_PATTERN = RegExp.compile("^(\\d*\\.?\\d*)$");

    private TimePeriodParser(TimePeriodUnit returnUnit, TimePeriodUnit defaultUnit,
            TimePeriodUnit... supportedUnits) {
        this.returnUnit = returnUnit;
        this.defaultUnit = defaultUnit;
        this.supportedUnits = supportedUnits;
    }

    @Override
    public BigDecimal parse(CharSequence text) throws ParseException {
        String string = text.toString().trim();
        if (string.isEmpty()) {
            return null;
        }
        try {

            MatchResult defaultMatch = DEFAULT_PATTERN.exec(string);
            if (defaultMatch != null) {
                return defaultUnit.convert(new BigDecimal(string), returnUnit);
            }

            BigDecimal resultInMin = null;

            for (TimePeriodUnit tpu : supportedUnits) {
                BigDecimal amount = tpu.parsePart(string);
                if (amount != null) {
                    BigDecimal amountInMin = tpu.convertToMinutes(amount);
                    if (resultInMin == null) {
                        resultInMin = amountInMin;
                    } else {
                        resultInMin = resultInMin.add(amountInMin);
                    }
                }
            }

            if (resultInMin == null) {
                return null;
            }
            return returnUnit.convertFromMinutes(resultInMin);

        } catch (NumberFormatException e) {
            return null;
        }
    }

}