unjar.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derbyTesting.functionTests.harness.UnJar

   Copyright 1999, 2004 The Apache Software Foundation or its licensors, as applicable.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.derbyTesting.functionTests.harness;

import java.io.*;

/**
  The upgrade tests use jar files containing older version
  databases. These need to be "unjarred" in order to do the tests.
  */
public class UnJar
{
 
    public UnJar()
    {
    }
    
    public static void main(String args[]) throws Exception
    {
        UnJar uj = new UnJar();
        uj.unjar(args[0], null, true);
    }
    
    public static void unjar(String jarname, String outputdir, boolean useprocess)
        throws ClassNotFoundException, IOException
    {
        if (outputdir == null)
            outputdir = System.getProperty("user.dir");
        
	    InputStream is =
            RunTest.loadTestResource("upgrade" + '/' + jarname);
        if (is == null)
        {
            System.out.println("File not found: " + jarname);
            System.exit(1);
        }
        
        // Copy to the current directory in order to unjar it
        //System.out.println("Copy the jarfile to: " + outputdir);
        File jarFile = new File((new File(outputdir, jarname)).getCanonicalPath());
        //System.out.println("jarFile: " + jarFile.getPath());
    	FileOutputStream fos = new FileOutputStream(jarFile);
        byte[] data = new byte[1024];
        int len;
    	while ((len = is.read(data)) != -1)
    	{
    	    fos.write(data, 0, len);
    	}
    	fos.close();
        
        // Now unjar the file
        String jarCmd = "jar xf " + jarFile.getPath();
        if ( useprocess == true )
        {
            // Now execute the jar command
            Process pr = null;
        	try
        	{
        		//System.out.println("Use process to execute: " + jarCmd);
                pr = Runtime.getRuntime().exec(jarCmd);
                
                pr.waitFor();
                //System.out.println("Process done.");
                pr.destroy();
            }
            catch(Throwable t)
            {
                System.out.println("Process exception: " + t.getMessage());
                if (pr != null)
                {
                    pr.destroy();
                    pr = null;
                }
            }
        }
        else
        {
            System.out.println("Jar not implemented yet with useprocess=false");
        }
    }
}