Normalize file names to conform android's convertions

Hi there!

Today i'm gonna show how to normalize resource file names coming from your designers saving you a lot of time while renaming it. It is more like an util class. It may help you like it helped me. NOTE: I'm using the apache-common-io lib for that.

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
/**
 * Normalizes incorrect file names to conform android's conventions.
 * @author Ricardo Ferreira
 * @version 1.0
 * @since 20/03/2014
 */
public class FileNameNormalizer {

   
    /**
     * Normalizes incorrect file names like "hello kit", "bruno & Mars" or "what-is-that" into "hello_kit", 
     * "bruno_Mars" and "what_is_that". Here an example on how to use it:
     * 

     *  String dir1 = "D:/dir1/";
     *  String dir2 = "D:/dir2/";
     *  String[] fromDirectories = new String[]{dir1,dir2};
     *  String[] withExtensions = new String[]{"gif", "png", "bmp" };
     *  String toDestination = "D:/destination/";
     *  String[] regularExpression =  new String[]{" & "," ","-" };
     *  normalize(fromDirectories, withExtensions, toDestination,regularExpression);
     * 
* @param fromDirectories
     * @param withExtensions
     * @param toDestination
     * @param regularExpression
     */
    public void normalize(String[] fromDirectories, final String[] withExtensions, final String toDestination,String[] regularExpression){//NOPMD
        for (String fromDirectory : fromDirectories) {
            normalize(fromDirectory, withExtensions, toDestination,regularExpression);
        }
    }
    
    private void normalize(String fromDirectory, final String[] withExtensions, final String toDestination, String[] regularExpression){//NOPMD
        fromDirectory=ensureCorrectDirectory(fromDirectory);
        String destination = ensureCorrectDirectory(toDestination);
        File dir = new File(fromDirectory);
        FilenameFilter filenameFilter = new FilenameFilter() {
            @Override
            public boolean accept(final File dir, final String name) {
                for (final String ext : withExtensions) {
                    if (name.endsWith("." + ext)) {
                        return (true);
                    }
                }
                return (false);
            }
        };
        
        if (dir.isDirectory()) { 
            for (final File f : dir.listFiles(filenameFilter)) {
                normalizeAndMoveTo(f.getAbsolutePath(), destination,regularExpression);
            }
        }
    }
    
    private String ensureCorrectDirectory(String dir){
        if(!dir.endsWith("/")){
            dir+="/";
        }
        return dir;
    }
    
    private void normalizeAndMoveTo(String toNomalize, String destination, String[] regularExpression){
        File oldFile =  new File(toNomalize);
        File temp =  new File(normalizePng(toNomalize,regularExpression));
        String newFilePath = destination + temp.getName();
        File newFile = new File(newFilePath);
        try {
          FileUtils.moveFile(oldFile, newFile);
        } catch (IOException e) {
          e.printStackTrace();
        }
    }
    
    private String normalizePng(String toNormalize, String[] regularExpression){
            String replacement = "_";
            String newname = toNormalize;
            for (String regex : regularExpression) {
                newname = newname.replaceAll(regex, replacement);
            }
            return newname;
    }
    
}

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