source: java/PlatformTools/src/net/oni2/platformtools/applicationinvoker/ApplicationInvoker.java

package net.oni2.platformtools.applicationinvoker;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.List;
import java.util.Vector;

import net.oni2.platformtools.PlatformInformation;
import net.oni2.platformtools.PlatformInformation.Platform;

/**
 * @author Christian Illy
 */
public class ApplicationInvoker {
        private static Vector<String> buildCommandLine(EExeType exeType,
                        File program, Vector<String> params, boolean ignoreFileNotFound)
                        throws ERuntimeNotInstalledException, FileNotFoundException {
                if (!ignoreFileNotFound)
                        if (program.getParentFile() != null && !program.exists())
                                throw new FileNotFoundException();
                Vector<String> cmdLine = new Vector<String>();
                switch (exeType) {
                        case DOTNET:
                                if (!DotNet.isInstalled())
                                        throw new ERuntimeNotInstalledException(
                                                        "No .NET runtime found");
                                if (PlatformInformation.getPlatform() != Platform.WIN)
                                        cmdLine.add(DotNet.getRuntimeExe().getPath());
                                cmdLine.add(program.getPath());
                                break;
                        case JAR:
                                if (!Java.isInstalled())
                                        throw new ERuntimeNotInstalledException("JRE not found");
                                cmdLine.add(Java.getRuntimeExe().getPath());
                                cmdLine.add("-jar");
                                cmdLine.add(program.getPath());
                                break;
                        case OSBINARY:
                                cmdLine.add(program.getPath());
                                break;
                        case WINEXE:
                                switch (PlatformInformation.getPlatform()) {
                                        case LINUX:
                                                if (!Wine.isInstalled())
                                                        throw new ERuntimeNotInstalledException(
                                                                        "Can not run Windows executable because Wine was not found");
                                                cmdLine.add(Wine.getRuntimeExe().getPath());
                                                cmdLine.add(program.getPath());
                                                break;
                                        case MACOS:
                                                throw new ERuntimeNotInstalledException(
                                                                "Can not run a Windows executable on MacOS");
                                        case WIN:
                                                cmdLine.add(program.getPath());
                                                break;
                                        case UNKNOWN:
                                                throw new ERuntimeNotInstalledException(
                                                                "Can not run a Windows executable on an unidentified system");
                                }
                                break;
                }
                if (params != null)
                        cmdLine.addAll(params);
                return cmdLine;
        }

        /**
         * Execute a short running application and wait for termination
         * 
         * @param exeType
         *            Type of executable to be run
         * @param workingDirectory
         *            Working directory for executed process
         * @param program
         *            Executable path
         * @param params
         *            List of command and arguments
         * @param ignoreFileNotFound
         *            Ignore if the program file is not found
         * @return Error code and list of output lines
         * @throws IOException
         *             Exc
         * @throws ERuntimeNotInstalledException
         *             If the program to be executed requires a runtime which could
         *             not be found on the system
         * @throws FileNotFoundException
         *             Program to be executed not found
         */
        public static ApplicationInvocationResult executeAndWait(EExeType exeType,
                        File workingDirectory, File program, Vector<String> params,
                        boolean ignoreFileNotFound) throws ERuntimeNotInstalledException,
                        FileNotFoundException, IOException {
                return executeAndWait(workingDirectory,
                                buildCommandLine(exeType, program, params, ignoreFileNotFound));
        }

        /**
         * Execute an app without waiting
         * 
         * @param exeType
         *            Type of executable to be run
         * @param workingDirectory
         *            Working directory for executed process
         * @param program
         *            Executable path
         * @param params
         *            List of command and arguments
         * @param ignoreFileNotFound
         *            Ignore if the program file is not found
         * @throws ERuntimeNotInstalledException
         *             If the program to be executed requires a runtime which could
         *             not be found on the system
         * @throws FileNotFoundException
         *             Program to be executed not found
         */
        public static void execute(EExeType exeType, File workingDirectory,
                        File program, Vector<String> params, boolean ignoreFileNotFound)
                        throws ERuntimeNotInstalledException, FileNotFoundException {
                execute(buildCommandLine(exeType, program, params, ignoreFileNotFound),
                                workingDirectory);
        }

        /**
         * Execute a short running application and wait for termination
         * 
         * @param workingDirectory
         *            Working directory for executed process
         * @param cmdLine
         *            List of command and arguments
         * @return Error code and list of output lines
         * @throws IOException
         *             Exc
         */
        private static ApplicationInvocationResult executeAndWait(
                        File workingDirectory, Vector<String> cmdLine) throws IOException {
                long start = new Date().getTime();
                ProcessBuilder pb = new ProcessBuilder(cmdLine);
                pb.redirectErrorStream(true);
                Process proc = pb.start();
                if (workingDirectory != null)
                        pb.directory(workingDirectory);

                InputStream is = proc.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);

                String line;
                Vector<String> lines = new Vector<String>();

                while ((line = br.readLine()) != null) {
                        lines.add(line);
                }
                try {
                        proc.waitFor();
                } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                return new ApplicationInvocationResult(proc.exitValue(), cmdLine,
                                lines, (int) (new Date().getTime() - start));
        }

        /**
         * Execute an app without waiting
         * 
         * @param cmd
         *            Command and parameters
         * @param workingDirectory
         *            Working directory of app
         */
        private static void execute(List<String> cmd, File workingDirectory) {
                try {
                        ProcessBuilder pb = new ProcessBuilder(cmd);
                        if (workingDirectory != null)
                                pb.directory(workingDirectory);
                        pb.start();
                } catch (IOException e) {
                        e.printStackTrace();
                }
        }

}