SystemUtils.java

package edu.stanford.hci.r3.util;

import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;

public class SystemUtils {

        private static final double BYTES_PER_MB = (1024.0 * 1024.0);

        public static final String LIBRARY_PATH_KEY = "java.library.path";

        public static final String LINE_SEPARATOR = System.getProperties()
                        .getProperty("line.separator");

        public static final String PATH_SEPARATOR = System.getProperty("path.separator");

        private static long previousTime;

        public static void addToLibraryPath(URL url) {
                try {
                        final String newPath = new File(url.toURI()).getAbsolutePath() + PATH_SEPARATOR
                                        + System.getProperty(LIBRARY_PATH_KEY);
                        System.setProperty(LIBRARY_PATH_KEY, newPath);
                        System.out.println(System.getProperty(LIBRARY_PATH_KEY));
                } catch (URISyntaxException e) {
                        e.printStackTrace();
                }
        }

        public static double getFreeMemoryInMB() {
                return Runtime.getRuntime().freeMemory() / BYTES_PER_MB;
        }

        public static File getWorkingDirectory() {
                return new File(System.getProperty("user.dir"));
        }

        public static boolean operatingSystemIsMacOSX() {
                String lcOSName = System.getProperty("os.name").toLowerCase();
                return lcOSName.startsWith("mac os x");
        }

        public static boolean operatingSystemIsWindowsVariant() {
                String lcOSName = System.getProperty("os.name").toLowerCase();
                return lcOSName.startsWith("windows");
        }

        public static void setWorkingDirectory(File file) {
                System.setProperty("user.dir", file.getAbsolutePath());
        }

        public static void tic() {
                previousTime = System.currentTimeMillis();
        }

        public static void toc() {
                DebugUtils.println("Clock: " + (System.currentTimeMillis() - previousTime) + " ms.");
        }

}

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