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Java example source code file (Util.java)

This example Java source code file (Util.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

decimal_format, decimalformat, durationunit, millissecond, nanos_in_one_microsecond, nanos_in_one_millisecond, nanos_in_one_second, nanosecond, stopwatch, string, stringbuilder, text, util

The Util.java Java example source code

/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * 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 org.slf4j.profiler;

import java.text.DecimalFormat;

/**
 * 
 * A collection of utility methods.
 * 
 * @author Ceki Gülcü
 *  
 */
class Util {

    static final long NANOS_IN_ONE_MICROSECOND = 1000;
    static final long NANOS_IN_ONE_MILLISECOND = NANOS_IN_ONE_MICROSECOND * 1000;
    static final long NANOS_IN_ONE_SECOND = NANOS_IN_ONE_MILLISECOND * 1000;
    private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("0.000");

    static DurationUnit selectDurationUnitForDisplay(StopWatch sw) {
        return selectDurationUnitForDisplay(sw.elapsedTime());
    }

    static DurationUnit selectDurationUnitForDisplay(long durationInNanos) {
        if (durationInNanos < 10 * NANOS_IN_ONE_MICROSECOND) {
            return DurationUnit.NANOSECOND;
        } else if (durationInNanos < 10 * NANOS_IN_ONE_MILLISECOND) {
            return DurationUnit.MICROSECOND;
        } else if (durationInNanos < 10 * NANOS_IN_ONE_SECOND) {
            return DurationUnit.MILLISSECOND;
        } else {
            return DurationUnit.SECOND;
        }
    }

    static public double convertToMicros(long nanos) {
        return (double) nanos / NANOS_IN_ONE_MICROSECOND;
    }

    static public double convertToMillis(long nanos) {
        return (double) nanos / NANOS_IN_ONE_MILLISECOND;
    }

    static public double convertToSeconds(long nanos) {
        return ((double) nanos / NANOS_IN_ONE_SECOND);
    }

    static String durationInDurationUnitsAsStr(StringBuilder buf, StopWatch sw) {
        DurationUnit du = selectDurationUnitForDisplay(sw);
        return durationInDurationUnitsAsStr(sw.elapsedTime(), du);
    }

    static String durationInDurationUnitsAsStr(long nanos, DurationUnit durationUnit) {
        StringBuilder buf = new StringBuilder();
        switch (durationUnit) {
        case NANOSECOND:
            buf.append(nanos);
            break;
        case MICROSECOND:
            double micros = convertToMicros(nanos);
            buf.append(DECIMAL_FORMAT.format(micros));
            break;
        case MILLISSECOND:
            double millis = convertToMillis(nanos);
            buf.append(DECIMAL_FORMAT.format(millis));
            break;
        case SECOND:
            double seconds = convertToSeconds(nanos);
            buf.append(DECIMAL_FORMAT.format(seconds));
            break;
        }
        return buf.toString();
    }

    static void appendDurationUnitAsStr(StringBuilder buf, DurationUnit durationUnit) {
        switch (durationUnit) {
        case NANOSECOND:
            buf.append("nanoseconds.");
            break;
        case MICROSECOND:
            buf.append("microseconds.");
            break;
        case MILLISSECOND:
            buf.append("milliseconds.");
            break;
        case SECOND:
            buf.append(" seconds.");
            break;
        }
    }
}

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