Example 4-17 shows a utility we've used in this chapter to create a ListResourceBundle class automatically, using data from an image or a sound file. You can use any data file you like. You'll find that adding this type of data to your resource bundles, specifying each byte manually, is very time consuming! This program takes three arguments: the data file to include in the resource bundle; the key used to retrieve the resource from the bundle; and the name of the class you subclass from ListResourceBundle. Specify the class name with no .java extension. The proper .java source file is created from the name you supply.

Here's how you might use this utility:

C:\> java ListResourceBundleCreator oreilly_ logo_ germany. gif
    OReillyLogoGerman
    OReillyLogoResources_ de

Example 4-17. Utility Program to Create a ListResourceBundle Using Data from a User-Supplied Data File

import java. io.*;
import java. util. Vector;

public class ListResourceBundleCreator {

  public static void main( String [] argv) throws Exception{
    FileInputStream inputFileReader = new FileInputStream( argv[ 0]);
    DataInputStream dis = new DataInputStream( inputFileReader);
    long fileSize;

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    Vector myVector = new Vector();

    while (true) {
      try {
        myVector. addElement( new Integer( dis. readUnsignedByte()));
      } catch (EOFException e) {
        break;
      }
    }

    fileSize = myVector. size();
    FileWriter outputFileWriter = new FileWriter( argv[ 2] + ". java");
    outputFileWriter. write(" import java. util.
	  ListResourceBundle;\ n\ n");
    outputFileWriter. write(" public class " + argv[ 2] +
      " extends ListResourceBundle {\ n\ n");
    outputFileWriter. write(" public Object [][] getContents() {\ n");
    outputFileWriter. write(" return contents;\ n");
    outputFileWriter. write(" }\ n\ n");

    outputFileWriter. write(" static byte [] " + argv[ 1] + " = {\ n");
    for (int i = 0; i < fileSize; i++) {
      outputFileWriter. write("\ t( byte)");
      outputFileWriter. write((( Integer) myVector.
	    elementAt( i)). toString());
      if (i < fileSize -1)
        outputFileWriter. write(",\ n");
    }
    outputFileWriter. write("\ n\ t};\ n\ n");
    outputFileWriter. write(" static final Object [][] contents = {\ n");
    outputFileWriter. write(" {\"" + argv[ 1] + "\", " +
	  argv[ 1] + "}\ n");
    outputFileWriter. write(" };\ n");
    outputFileWriter. write("}\ n");
    outputFileWriter. close();
  }
}

[Lines 24 and 25 above are one line, as are lines 35-36 and 41-42. They have been split for formatting purposes.]

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