g4vrmlview.java

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// ********************************************************************
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//
//
// $Id: g4vrmlview.java 66373 2012-12-18 09:41:34Z gcosmo $
//
import java.io.*;
import java.net.*;

//------------------//
// class g4vrmlview //
// ( main() )       // 
//------------------//
public class g4vrmlview
{
    public static void main( String[] args )
    {
    try{
        // CONST 
        final String VERSION             = "1.00"   ;
        final String DATE                = "August 19, 1997";

        final int    PORT_NO             = 40801    ;
        final String OUTPUT_FILE_HEAD    = "g4"     ;
        final String OUTPUT_FILE_EXT     = "wrl"    ;
        final int    MAX_TRIAL           = 10       ;

        // local
        int          portNo              = PORT_NO  ; 

        // argument checking
        if(  args.length != 1 && args.length != 2 )
        {
            System.out.println( "-------------------------------");
            System.out.println( " G4VRMLView version  " + VERSION );
            System.out.println( "     " + DATE                   );
            System.out.println( "-------------------------------");
            System.out.println( "Usage: java g4vrmlview browser_name [port_number]");
            System.out.println( "  Browser_name: netscape, vrweb, etc, or NONE");
            return ;
        }
        
        // VRML browser
        String       browser = new String ( args[0] ) ;

        // port number
        if( args.length == 2 ) 
        {
            portNo = Integer.parseInt( args[1] );
        }

        // make a server socket
        ServerSocket  ss = null ;
        for ( int i = 0 ; i < MAX_TRIAL ; i++ )
        {
            try 
            {
                ss = new ServerSocket( portNo );
                System.out.println( "Waiting for requests at port  " +portNo + " ...");
                break ;
            }
            catch ( Exception e ) 
            {
                portNo++ ; 
                if( i >= MAX_TRIAL ) 
                { 
                    System.out.println( "Sockets are not available.");
                    return ;
                }
            }
        } // for 


        // open connection and invoke thread
        int nSpawn = 0 ;
        while( true )
        {
            Socket socket = ss.accept();    nSpawn++ ;

            System.out.println( "Connection accepted by thread " + nSpawn ); 

            ( new g4vrmlviewThread( socket, OUTPUT_FILE_HEAD, OUTPUT_FILE_EXT , browser )).start() ;

        } // while

    }
    catch ( Exception e ) 
    {
        System.out.println( e.toString() );
    }   
    } // main()

} // g4vrmlview


//------------------------//
// class g4vrmlviewThread //
//------------------------//
class g4vrmlviewThread extends Thread
{
    private final String NONE = "NONE" ; // no browser
    private  Socket     m_socket     ;
    private  String     m_outputFile     ;      
    private  String     m_browser    ;

    // constuctor
    public g4vrmlviewThread(    Socket socket          , 
                    String outputFileHead  , 
                    String outputFileExt   , 
                    String browser     ) 
    {
        m_socket     = socket ;
        SetOutputFileName ( outputFileHead  , outputFileExt );
        m_browser    = new String ( browser    );
    }

    private void SetOutputFileName( String outputFileHead,
                    String outputFileExt  )
    {
        // temporary file name
        String  outputFile_tmp 
        = new String (  outputFileHead + 
                "."            +
                outputFileExt   ) ; 

        // for modification of temporary filename
        int n = 1 ; 

        // make a non-existing filename
        while ( true )
        {
            File file = new File ( outputFile_tmp );

            if ( !file.exists() ) 
            { 
                break ; 
            } else {

                outputFile_tmp 
                = new String (  outputFileHead + 
                        "_"            +
                        (n++)          +
                        "."            +
                        outputFileExt   ); 
            }

        } // while

        // set decided filename to data field
        m_outputFile = new String ( outputFile_tmp ); 

    } // g4vrmlviewThread::setOutputFileName()


    // run ()
    public void run ()
    {
    try{
        // get input stream from socket
        BufferedReader br 
        = new BufferedReader ( new InputStreamReader ( m_socket.getInputStream() ) ) ;

        // get output stream to file
        BufferedWriter bw 
        = new BufferedWriter ( new FileWriter ( m_outputFile ) ) ;

        // socket ==> file
        String line ;
        while ( (line = br.readLine()) != null )
        {
            bw.write( line );   
            bw.newLine()    ;
            bw.flush  ()    ;
        }
        System.out.println( "VRML data is saved to file " +m_outputFile );

        // close streams and socket
        br.close();
        bw.close();
        m_socket.close() ; 

        // invoke browser
        if( !m_browser.equals(NONE) )
        {
            try 
            {

                File file = new File ( m_outputFile );

                // visualize created VRML file with browser 
                if ( file.exists() ) 
                {
                    String  outputFileAbs  = new String ( file.getAbsolutePath() ) ;
                    String[] command = { m_browser, outputFileAbs };
                    System.out.println( "Command: " + command[0] + " " + command[1] );

                    Process  exec_process    = null ;
    
                    Runtime runtime = Runtime.getRuntime();
                    exec_process    = runtime.exec( command );
                    exec_process.waitFor() ;
                } else {
                        System.out.println( "Error: Failed to open file" + m_outputFile );
                }
            } 
            catch ( Exception e ) 
            {  
                System.out.println( e.toString() );
            }

        } 
        else 
        {
            System.out.println( "No browser was invoked" );
        }

    }
    catch( Exception e ) 
    {
        System.out.println( e.toString() );
    }   
    } // run()

} // g4vrmlviewThread