package pyUML.backend;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * some helper methods for common java problems, i.e. file copying 
 */
public class JavaHelperMethods {

	/** 
	 * Fast & simple file copy.
	 * copies source file to destination file 
	 */
	public static void copy(File source, File dest) throws IOException {
		
		InputStream in = new FileInputStream(source);
		OutputStream out = new FileOutputStream(dest);
		final int bufferSize = 4096;
		try {
			byte[] buffer = new byte[bufferSize];
			int bytesRead;
			while ((bytesRead = in.read(buffer)) >= 0) {
				out.write(buffer, 0, bytesRead);
			}
		} finally {
			out.close();
			in.close();
		}
	}
	public static InputStream stringToStream(String s) {
		return new ByteArrayInputStream(s.getBytes());
	}
	
	/**
	 * Joins an Array of Strings to one big String separated by
	 * a separator
	 * @param array The String array to join
	 * @param separator The separator
	 * @return the joined String
	 */
    public static String join(String[] array, String separator) {
        if (array==null) return "";
        StringBuffer sb = new StringBuffer(array[0]);
        for(int i=1; i<array.length; i++) {
            sb.append(separator + array[i]);
        }
        return sb.toString();
    }
    
    /**
     * Returns the number of files present in a directory-tree
     * matching the given regex.
     * This can be used to count the packages (__init__.py)
     * 		for progress monitoring.
     * @param parentDir The directory to start with
     * @param regex The regex to match
     * @return the Number of occurrence of the file in the dir tree
     */
    public static int getFileCount(File parentDir, String regex)
    {
 
        File[] filesAndDirs = parentDir.listFiles();
        int count=0;
 
        for( File file: filesAndDirs )
        {
            if( file.getName().matches(regex))
            {
                count ++;
            }
            if (file.isDirectory())
            {
                count += getFileCount(file, regex);
            }
        }
        return count;
    }
}