| gvSIG desktop 1

/*

 *  $Id: ScriptParser.java,v 1.1 2006/06/14 07:29:07 cesar Exp $

 *  IzPack

 *  Copyright (C) 2001-2004 Julien Ponge

 *

 *  File :               ScriptParser.java

 *  Description :        Parses the scripts files for special variables.

 *  Author's email :     julien@izforge.com

 *  Author's Website :   http://www.izforge.com

 *

 *  Portions are Copyright (c) 2001 Johannes Lehtinen

 *  johannes.lehtinen@iki.fi

 *  http://www.iki.fi/jle/

 *

 *  This program 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

 *  of the License, or any later version.

 *

 *  This program 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 this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

 */

package com.izforge.izpack.installer;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Collection;

import java.util.Iterator;

import com.izforge.izpack.ParsableFile;

import com.izforge.izpack.util.OsConstraint;

/**

 * The script parser classe.

 * @author Julien Ponge

 * @author Johannes Lehtinen

 */

public class ScriptParser

{

  /**  The install path. */

  public final static String INSTALL_PATH = "INSTALL_PATH";

  /**  The Java home path. */

  public final static String JAVA_HOME = "JAVA_HOME";

  /**  The user home path. */

  public final static String USER_HOME = "USER_HOME";

  /**  The user name. */

  public final static String USER_NAME = "USER_NAME";

  /**  The file separator character. */

  public final static String FILE_SEPARATOR = "FILE_SEPARATOR";

  /** The application name. */

  public final static String APP_NAME = "APP_NAME";

  /** The application URL. */

  public final static String APP_URL = "APP_URL";

  /** The application version. */

  public final static String APP_VER = "APP_VER";

  /** The language IS03 code. */

  public final static String ISO3_LANG = "ISO3_LANG";

  /**  The files to parse. */

  private Collection files;

  /**  The variables substituror. */

  private VariableSubstitutor vs;

  /**

   *  Constructs a new parser. The parsable files specified must have

   *  pretranslated paths (variables expanded and file separator characters

   *  converted if necessary).

   *

   * @param  files  the parsable files to process

   * @param  vs     the variable substitutor to use

   */

  public ScriptParser(Collection files, VariableSubstitutor vs)

  {

    this.files = files;

    this.vs = vs;

  }

  /**

   *  Parses the files.

   *

   * @exception  Exception  Description of the Exception

   */

  public void parseFiles() throws Exception

  {

    // Parses the files

    Iterator iter = files.iterator();

    while (iter.hasNext())

    {

      // Create a temporary file for the parsed data

      // (Use the same directory so that renaming works later)

      ParsableFile pfile = (ParsableFile) iter.next();

      // check whether the OS matches

      if (!OsConstraint.oneMatchesCurrentSystem(pfile.osConstraints))

      {

        continue;

      }

      File file = new File(pfile.path);

      File parsedFile = File.createTempFile("izpp", null, file.getParentFile());

      // Parses the file

      // (Use buffering because substitutor processes byte at a time)

      FileInputStream inFile = new FileInputStream(file);

      BufferedInputStream in = new BufferedInputStream(inFile, 5120);

      FileOutputStream outFile = new FileOutputStream(parsedFile);

      BufferedOutputStream out = new BufferedOutputStream(outFile, 5120);

      vs.substitute(in, out, pfile.type, pfile.encoding);

      in.close();

      out.close();

      // Replace the original file with the parsed one

      file.delete();

      if (!parsedFile.renameTo(file))

        throw new IOException(

          "Could not rename file " + parsedFile + " to " + file);

    }

  }

}