/*
  Copyright (c) 2000-2007 The Regents of the University of California.
  All rights reserved.
  Permission is hereby granted, without written agreement and without
  license or royalty fees, to use, copy, modify, and distribute this
  software and its documentation for any purpose, provided that the above
  copyright notice and the following two paragraphs appear in all copies
  of this software.

  IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
  FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
  THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
  SUCH DAMAGE.

  THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
  PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
  CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
  ENHANCEMENTS, OR MODIFICATIONS.

  PT_COPYRIGHT_VERSION_2
  COPYRIGHTENDKEY

*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;


/** Print the location of the system jar file, usually rt.jar
    @author Christopher Hylands
    @version $Id: SystemJar.java 47512 2007-12-07 06:21:57Z cxh $
    @since Ptolemy II 2.0
    @Pt.ProposedRating Green (cxh)
    @Pt.AcceptedRating Red
*/
public class SystemJar {
    public static void main(String[] args) {
        try {
            System.out.print(_getSystemJar());
        } catch (Exception exception) {
            System.err.print("SystemJar.main(): " + exception);
        }
    }

    ///////////////////////////////////////////////////////////////////
    ////                         protected methods                 ////
    // Return the path name to the system jar file, usually rt.jar.
    private static File _getSystemJar()
        throws IOException, FileNotFoundException {
        String systemJarPathName = System.getProperty("java.home")
                + File.separator + "lib" + File.separator + "rt.jar";

        File systemJar = new File(systemJarPathName);

        // This would be a good place to search in other places, perhaps
        // by reading a property like ptolemy.system.jar
        // However, we should wait until this is a problem.
        // The code works with Sun JDK1.2 and 1.3 and IBM JDK1.3.
        if (!systemJar.isFile()) {
            // Try this for IBM JDK 1.4.1
            String systemJarPathName2 = System.getProperty(
                        "java.home") + File.separator + "lib" + File.separator
                    + "core.jar";
            systemJar = new File(systemJarPathName2);


            if (!systemJar.isFile()) {
                // Search for Classes.jar on the mac
                String systemJarPathName3 = System.getProperty("java.home")
                    + File.separator + "../Classes"
                    + File.separator + "classes.jar";
                systemJar = new File(systemJarPathName3);

                if (!systemJar.isFile()) {
                    throw new FileNotFoundException(systemJarPathName + " and "
                            + systemJarPathName2 + " and "
                            + systemJarPathName3
                            + " either do not exist or are not readable");
                } else {
                    systemJarPathName = systemJarPathName3;
                }
            } else {
                systemJarPathName = systemJarPathName2;
            }
        }

        if (!systemJar.canRead()) {
            throw new IOException("Can't read '" + systemJarPathName + "'");
        }

        return systemJar;
    }
}