org.jboss.tools.openshift.internal.common.ui.utils.DateTimeUtils.java Source code

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/*******************************************************************************
 * Copyright (c) 2015 Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.jboss.tools.openshift.internal.common.ui.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.time.DurationFormatUtils;
import org.jboss.tools.openshift.internal.common.ui.OpenShiftCommonUIActivator;

public class DateTimeUtils {

    private static long NANOSECONDS_PER_SEC = 1000000;

    private DateTimeUtils() {
    }

    public static String formatDuration(long nanoseconds) {
        String[] parts = DurationFormatUtils.formatDuration(nanoseconds / NANOSECONDS_PER_SEC, "H:m:s:S")
                .split(":");
        StringBuilder builder = new StringBuilder();
        if (Integer.valueOf(parts[0]) > 0) {
            builder.append(parts[0]).append(" hrs.");
        }
        if (Integer.valueOf(parts[1]) > 0) {
            builder.append(" ").append(parts[1]).append(" min.");
        }
        if (Integer.valueOf(parts[2]) > 0) {
            builder.append(" ").append(parts[2]).append(" sec.");
        }
        if (builder.length() == 0) {
            builder.append("Now");
        }
        return builder.toString().trim();
    }

    public static String formatSince(String value) {
        return formatSince(value, null);
    }

    public static String formatSince(String value, TimeZone timezone) {
        try {
            Date date = parse(value);
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.FULL);
            if (timezone != null) {
                formatter.setTimeZone(timezone);
            }
            return formatter.format(date);
        } catch (ParseException e) {
            OpenShiftCommonUIActivator.getDefault().getLogger()
                    .logWarning("Unable to parse format duration value: " + value, e);
        }
        return value;
    }

    public static Date parse(String value) throws ParseException {
        if (StringUtils.isEmpty(value)) {
            //prevent null pointer and index out of bounds exceptions.
            throw new ParseException("Date is not provided", 0);
        }
        //ref: http://www.java2s.com/Code/Java/Data-Type/ISO8601dateparsingutility.htm
        //assume date is like: '2015-11-11T20:32:37Z' 
        String modValue = value.substring(0, value.length() - 1) + "GMT-00:00";
        SimpleDateFormat parser = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz");
        return parser.parse(modValue);
    }
}