core/org.eclipse.rcptt.reporting/src/org/eclipse/rcptt/reporting/core/TimeFormatHelper.java

/*******************************************************************************
 * Copyright (c) 2009, 2019 Xored Software Inc and others.
 * 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
 * https://www.eclipse.org/legal/epl-v20.html
 *
 * Contributors:
 *     Xored Software Inc - initial API and implementation and/or initial documentation
 *******************************************************************************/
package org.eclipse.rcptt.reporting.core;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;

public final class TimeFormatHelper {

    private static DecimalFormat secondsFormat;

    static {
        DecimalFormatSymbols symbols = new DecimalFormatSymbols();
        symbols.setDecimalSeparator('.');
        secondsFormat = new DecimalFormat("#0.000", symbols); //$NON-NLS-1$
    }

    private TimeFormatHelper() {
    }

    public static String format(long millis) {
        int mins = 0;
        double secs = 0;
        if (millis != 0) {
            double time = (double) millis / 1000;
            mins = (int) (time / 60);
            secs = time - mins * 60;
        }

        StringBuilder result = new StringBuilder();
        if (mins != 0) {
            result.append(mins);
            result.append(" m "); //$NON-NLS-1$
            result.append((int) secs);
        } else {
            result.append(secondsFormat.format(secs));
        }
        result.append(" s"); //$NON-NLS-1$

        return result.toString();
    }
}