v1/src/repackage/repackage/EditBuildScript.java

/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  All rights 
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer. 
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:  
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must 
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written 
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache 
*    XMLBeans", nor may "Apache" appear in their name, without prior 
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2000-2003 BEA Systems 
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/

package repackage;

import java.io.*;

public class EditBuildScript
{
    //
    // usgae: edit buildfile token new-value
    //

    public static void main ( String[] args )
        throws Exception
    {
        if (args.length != 3)
            throw new IllegalArgumentException( "Wrong number of arguments" );

        args[ 0 ] = args[ 0 ].replace( '/', File.separatorChar );

        File buildFile = new File( args[ 0 ] );

        StringBuffer sb = readFile( buildFile );

        String tokenStr = "<property name=\"" + args[ 1 ] + "\" value=\"";
                         
        int i = sb.indexOf( tokenStr );

        if (i < 0)
            throw new IllegalArgumentException( "Can't find token: " + tokenStr );

        int j = i + tokenStr.length();

        while ( sb.charAt( j ) != '"' )
            j++;

        sb.replace( i + tokenStr.length(), j, args[ 2 ] );

        writeFile( buildFile, sb );
    }
    
    static StringBuffer readFile ( File f )
        throws IOException
    {
        InputStream in = new FileInputStream( f );
        Reader r = new InputStreamReader( in );
        StringWriter w = new StringWriter();

        copy( r, w );

        w.close();
        r.close();
        in.close();

        return w.getBuffer();
    }
    
    static void writeFile ( File f, StringBuffer chars )
        throws IOException
    {
        OutputStream out = new FileOutputStream( f );
        Writer w = new OutputStreamWriter( out );
        Reader r = new StringReader( chars.toString() );

        copy( r, w );

        r.close();
        w.close();
        out.close();
    }
    
    static void copy ( Reader r, Writer w ) throws IOException
    {
        char[] buffer = new char [ 1024 * 16 ];

        for ( ; ; )
        {
            int n = r.read( buffer, 0, buffer.length );

            if (n < 0)
                break;

            w.write( buffer, 0, n );
        }
    }
}