source: AE/installer2/src/net/oni2/aeinstaller/backend/DotNet.java@ 709

package net.oni2.aeinstaller.backend;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import java.util.Vector;

import net.oni2.applicationinvoker.AppExecution;
import net.oni2.applicationinvoker.AppExecutionResult;
import net.oni2.settingsmanager.Settings;
import net.oni2.settingsmanager.Settings.Architecture;
import net.oni2.settingsmanager.Settings.Platform;

/**
 * @author Christian Illy
 */
public class DotNet {

        /**
         * @return is a .NET implementation installed?
         */
        public static boolean isInstalled() {
                switch (Settings.getPlatform()) {
                        case WIN:
                                try {
                                        int view = WinRegistry.KEY_WOW64_32KEY;
                                        if (Settings.getArchitecture() == Architecture.AMD64)
                                                view = WinRegistry.KEY_WOW64_64KEY;

                                        Map<String, String> m = WinRegistry
                                                        .readStringValues(
                                                                        WinRegistry.HKEY_LOCAL_MACHINE,
                                                                        "Software\\Microsoft\\NET Framework Setup\\NDP\\v2.0.50727",
                                                                        view);
                                        return m != null;
                                } catch (IllegalArgumentException e) {
                                        e.printStackTrace();
                                } catch (IllegalAccessException e) {
                                        e.printStackTrace();
                                } catch (InvocationTargetException e) {
                                        e.printStackTrace();
                                } catch (Exception e) {
                                        if (!e.getMessage()
                                                        .equals("Registry access not supported (not a Windows OS?)."))
                                                e.printStackTrace();
                                }
                                return false;
                        case MACOS:
                        case LINUX:
                                Vector<String> cmd = new Vector<String>();
                                cmd.add("which");
                                cmd.add("mono");
                                AppExecutionResult res = null;
                                try {
                                        res = AppExecution.executeAndWait(cmd);
                                } catch (IOException e) {
                                        e.printStackTrace();
                                }
                                if (res != null) {
                                        if (res.output.get(0).startsWith("/")
                                                        && res.output.get(0).endsWith("mono")) {
                                                return true;
                                        }
                                }
                                return false;
                        default:
                                return false;
                }
        }

        /**
         * @return Get the .Net runtime executable name
         */
        public static String getRuntimeExe() {
                if (Settings.getPlatform() != Platform.WIN)
                        return "mono";
                return "";
        }

}