package org.apache.tools.ant.taskdefs.launcher;

import java.io.File;
import java.io.IOException;

import org.apache.tools.ant.Project;

/**
 * A command launcher for Windows XP/2000/NT that uses 'cmd.exe' when
 * launching commands in directories other than the current working
 * directory.
 */
public class WinNTCommandLauncher extends CommandLauncherProxy {
    public WinNTCommandLauncher(CommandLauncher launcher) {
        super(launcher);
    }

    /**
     * Launches the given command in a new process, in the given
     * working directory.
     * 
     * @param project
     *        the Ant project.
     * @param cmd
     *        the command line to execute as an array of strings.
     * @param env
     *        the environment to set as an array of strings.
     * @param workingDir
     *        working directory where the command should run.
     * @return the created Process.
     * @throws IOException
     *         forwarded from the exec method of the command launcher.
     */
    @Override
    public Process exec(Project project, String[] cmd, String[] env,
                        File workingDir) throws IOException {
        File commandDir = workingDir;
        if (workingDir == null) {
            if (project != null) {
                commandDir = project.getBaseDir();
            } else {
                return exec(project, cmd, env);
            }
        }
        // Use cmd.exe to change to the specified directory before running
        // the command
        final int preCmdLength = 6;
        String[] newcmd = new String[cmd.length + preCmdLength];
        // CheckStyle:MagicNumber OFF - do not bother
        newcmd[0] = "cmd";
        newcmd[1] = "/c";
        newcmd[2] = "cd";
        newcmd[3] = "/d";
        newcmd[4] = commandDir.getAbsolutePath();
        newcmd[5] = "&&";
        // CheckStyle:MagicNumber ON
        System.arraycopy(cmd, 0, newcmd, preCmdLength, cmd.length);

        return exec(project, newcmd, env);
    }
}
