package listem;

import java.io.File;
import java.util.Map;

public interface LineCounter {
	
	/**
	 * Count the number of lines in files whose names match a given pattern.
	 * 
	 * @param directory The base directory to look at files from
	 * @param fileSelectionPattern Pattern for selecting file names
	 * @param recursive Recursively search through directories
	 * @return A Map containing files whose lines were counted. Each file is mapped
	 * to an integer which is the number of lines counted in the file.
	 */
	public Map<File, Integer> countLines(File directory, String fileSelectionPattern, 
			boolean recursive);
	
}