source: main/trunk/greenstone3/src/java/org/greenstone/admin/guiext/Command.java@ 31667

package org.greenstone.admin.guiext;

import org.w3c.dom.Element;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.File;

import java.util.HashMap;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JOptionPane;

import org.greenstone.util.SafeProcess;

public class Command implements Runnable
{
    HashMap<String, String> _osCommands = new HashMap<String, String>();
    CommandStep _parent = null;

    public Command(Element commandElement, CommandStep parent) 
    {
    _parent = parent;                       

    if(commandElement != null){
        Element[] commands = ExtXMLHelper.getMultipleChildElements(commandElement, "os", true);
        for(int i = 0; i < commands.length; i++){
        Element currentCommand = commands[i];
        String os = currentCommand.getAttribute("name");

        if(os.equals("")){
            System.err.println("A <" + ExtXMLHelper.COMMAND + "> element does not have an \"os\" attribute");
        }
        else{
            _osCommands.put(os, ExtXMLHelper.getValueFromSingleElement(currentCommand, false));
        }
        }
    }
    else{
        System.err.println("This <" + ExtXMLHelper.COMMAND + "> element is null");
    }
    }

    public void run()
    {
    JTextArea messageArea = _parent.getMessageArea();
    String command = getCommandForCurrentOS();
    
    if(command == null){
        System.err.println("No commands exist for your current operating system, to avoid seeing this warning please place <os name=\"default\"/> into the set of commands for this step in the extension_project_list.xml file located in your extension directory");
        _parent.threadError();
        return;
    }
    else if(command == ""){
        _parent.threadError();
        return;
    }
        
    File workingDirectory = new File(_parent.getParent().getParent().getExtensionDirectory());
    SafeProcess commandLineProc = null;
    try{
        commandLineProc = null;
        String[] args = new String[3];
        
        if(System.getProperty("os.name").contains("Windows")){
        args[0] = "cmd.exe";
        args[1] = "/C";
        args[2] = command;

        String allArgs = new String();
        for(int i = 0; i < args.length; i++){
            if(i != 0){allArgs += " ";}
            allArgs += args[i];
        }

        messageArea.append("\nExecuting \"" + allArgs + "\" on the command line\n");

        //commandLineProc = Runtime.getRuntime().exec(args, null, workingDirectory);
        }
        else{
        args[0] = "sh";
        args[1] = "-c";
        args[2] = command;

        String allArgs = new String();
        for(int i = 0; i < args.length; i++){
            if(i != 0){allArgs += " ";}
            allArgs += args[i];
        }

        messageArea.append("\nExecuting \"" + allArgs + "\" on the command line\n");
        //commandLineProc = Runtime.getRuntime().exec(args, null, workingDirectory);
        }

        commandLineProc = new SafeProcess(args, null, workingDirectory); 

        /*
        BufferedReader stdInput = new BufferedReader(new InputStreamReader(commandLineProc.getInputStream()));

        Thread stdPrinter = new PrinterThread(messageArea, stdInput);
        stdPrinter.start();

        BufferedReader stdError = new BufferedReader(new InputStreamReader(commandLineProc.getErrorStream()));

        Thread errPrinter = new PrinterThread(messageArea, stdError);
        errPrinter.start();
        
        int success = commandLineProc.waitFor();
        */

        // Replacing the above and its use of the PrinterThread inner class with SafeProcess.java:
        SafeProcess.LineByLineHandler outLineHandler = new ProcessLineHandler(messageArea, SafeProcess.STDOUT);
        SafeProcess.LineByLineHandler errLineHandler = new ProcessLineHandler(messageArea, SafeProcess.STDERR);         

        int success = commandLineProc.runProcess(outLineHandler, errLineHandler);

        if(success != 0){
        System.err.println("Command line process \"" + command  + "\" returned unsuccessfully with the value \"" + success + "\"");
        _parent.threadError();
        return;
        }
    }
    catch(Exception ex){
        ex.printStackTrace();
        _parent.threadError();
        return;
    } 
    _parent.startNextThread();
    }

    public boolean executeCommand()
    {
    return false;
    }

    public CommandStep getParent()
    {
    return _parent;
    }

    public String getCommandForCurrentOS()
    {
    String currentos = System.getProperty("os.name");

    String command = _osCommands.get(currentos);
    if(command != null){
        return command;
    }
    
    if(currentos.contains("Windows")){
        command = _osCommands.get("Windows");
        
        if(command != null){
        return command;
        }   
    }
    return _osCommands.get("default");
    }

    /*
    public class PrinterThread extends Thread
    {
    JTextArea _messageArea = null;
    BufferedReader _output = null;

    public PrinterThread(JTextArea messageArea, BufferedReader output)
    {
        _messageArea = messageArea;
        _output = output;
    }
    
    public void run()
    {
        String s = "";

        try{
        while ((s = _output.readLine()) != null) {
            _messageArea.append(s + "\n");
            _messageArea.setSelectionEnd(_messageArea.getDocument().getLength());
        }  
        }
        catch(Exception ex){
        ex.printStackTrace();
        }
    }
    }*/

    public class ProcessLineHandler extends SafeProcess.LineByLineHandler
    {
    // These members need to be final in order to synchronize on them
    private final JTextArea _messageArea;

    public ProcessLineHandler(JTextArea messageArea, int src)
    {
        super(src); // will set this.source to STDERR or STDOUT
        _messageArea = messageArea;
    }

    public void gotLine(String line) { // first non-null line

        // messageArea needs to be synchronized, since both the process'
        // stderr and stdout will be attempting to append to it from their own threads

        synchronized(_messageArea) {
        _messageArea.append(line + "\n");
        _messageArea.setSelectionEnd(_messageArea.getDocument().getLength());
        }
    }
    public void gotException(Exception e) {
        e.printStackTrace();
    }

    }
}