/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.core.perftool;

/** Class with several utility methods
 *
 */
public final class Util {

    /** flag */
    private static int run = -1;

    /** No instances */
    private Util() {
    }
    
    /** Utility method used to converting milliseconds and
     * bytes to seconds and mega bytes.
     * @param l a number
     * @param radix divider used for conversion from B to MB (1024 * 1024) or from ms to s (1000)
     * @param power number of figures after comma 3->10,283 2->10,28
     */
    public static String long2Print(long l, float radix, int power) {
        double tenpower = tenpower(power);
        double first = ((double) l) / radix;
        long sec = (long) (first * tenpower);
        first = ((double) sec) / tenpower;
        return String.valueOf(first);
    }
    
    /** 0->1, 1->10, 2->100, 3->1000, ... */
    static double tenpower(int power) {
        double ret = 1f;
        double iter = 0f;
        double npower = 10f;
        while (power > 0) {
            iter = (power % 2) * npower;
            if (iter > 0) {
                ret *= iter;
            }
            npower = Math.pow(npower, 2f);
            power /= 2;
        };
        return ret;
    }

    /** Waits for system threads - AWT, RequestProcessor */
    public static void waitForSystemThreads() {
        if (isRunning()) {
            Runnable run = new EmptyRunnable();
            org.openide.util.Task task = org.openide.util.RequestProcessor.postRequest(run);
            task.waitFinished();
            try {
                java.awt.EventQueue.invokeAndWait(run);
            } catch (Exception e) {
            }
        }
    }
    
    /** @return true if this PerformanceMeterImpl is
     * switched on.
     */
    public static boolean isRunning() {
        if (run == -1) {
            String prop = System.getProperty(PerformanceMeter.NAMING_NAME);
            run = (prop == null ? 0 : 1);
        }
        
        return (run == 1);
    }
    
    /** Empty implementation of Runnable */
    private static final class EmptyRunnable implements Runnable {
        EmptyRunnable() {}
        public void run() {
        }
    }
}