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/*

  Copyright (c) 2001, 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.rmi.rmic;

import java.io.InputStream;

/**

 * Subclass of Compiler that can be subclassed to invoke a process to

 * do its work.

 */

public abstract class CompilerProcess extends Compiler

{

  /** This is used to compute the command line for the process.  */

  public abstract String[] computeArguments (String filename);

   /**

    * This is used to compute the command line for the process.

    * Most compilers typically arrange their arguments as in

    * <compiler name and arguments> <optional destination> <filename>.

    * This method builds an argument array out that. It should be used

    * to define computeArguments for those compilers that follow the

    * argument convention described above.

    */

   public static String[] computeTypicalArguments(String[] compilerArgs,

        String destination, String filename)

   {

     return computeTypicalArguments(compilerArgs, null, destination, filename);

   }

   /**

    * This is used to compute the command line for the process.

    * Most compilers typically arrange their arguments as in

    * <compiler name and arguments> <optional destination> <filename>.

    * This method builds an argument array out that. It should be used

    * to define computeArguments for those compilers that follow the

    * argument convention described above.

    */

   public static String[] computeTypicalArguments(String[] compilerArgs,

                                                  String classpath,

                                                  String destination,

                                                  String filename)

   {

     /* length of compiler specific arguments */

     int len = compilerArgs.length;

     /* length of returned array of arguments */

     final int arglen = len + (classpath == null ? 0 : 2) +

       (destination == null ? 0 : 2) + 1;

     /* Allocate String array for computed arguments. */

     String [] args = new String[arglen];

     /* Fill in compiler arguments. */

     System.arraycopy(compilerArgs, 0, args, 0, len);

     /* Fill in classpath argument if necessary. */

     if (classpath != null)

       {

         args[len++] = "-classpath";

         args[len++] = classpath;

       }

     /* Fill in destination argument if necessary. */

     if (destination != null)

      {

        args[len++] = "-d";

        args[len++] = destination;

      }

     /* Fill in filename */

     args[arglen - 1] = filename;

     return args;

   }

  public void compile (String name) throws Exception

  {

    String[] args = computeArguments (name);

    Process p = Runtime.getRuntime ().exec (args);

    /* Print compiler output to System.out.  Do this asynchronously so

       that the compiler never blocks writing to its stdout.  */

    {

      final InputStream procin = p.getInputStream();

      final Thread copier = new Thread()

        {

          public void run()

          {

            try

              {

                for (int ch = procin.read(); ch != -1; ch = procin.read())

                  System.out.print((char) ch);

              }

            catch (java.io.IOException _)

              {

              }

          }

        };

      copier.start();

    }

    /* Collect compiler error output in a buffer.

     * If compilation fails, it will be used for an error message.

     */

    StringBuffer stderr = new StringBuffer();

    InputStream procerr = p.getErrorStream();

    for (int ch = procerr.read(); ch != -1; ch = procerr.read())

      stderr.append((char) ch);

    int result;

    while (true)

      {

        try

          {

            result = p.waitFor ();

            break;

          }

        catch (InterruptedException _)

          {

          }

      }

    if (result != 0)

      {

        // FIXME: wrong exception class.

        throw new Exception ("compiler exited with status: " + result,

                             new RMICException(stderr.toString()));

      }

  }

}