import java.io.*;

class FileInfo {
	File path;
	public FileInfo(String path) {
		this.path = new File(path);
	}

	// ex a
	public void fileCount() {
		long fileCount = 0;
		File[] l = path.listFiles();
		for(int i = 0; i < l.length; i++) 
			if(l[i].isFile())
				fileCount++;
		System.out.println(fileCount);
	}
	
	// ex b
	// It slightly unclear if one should print the sum of the lengths, or the length
	// of each file. I print the sum as it is slightly more complicated.
	public void dirSize() {
		long dirSize = 0;
		File[] l = path.listFiles();
		for(int i = 0; i < l.length; i++) 
			if(l[i].isFile())
				dirSize += l[i].length();
		System.out.println(dirSize);
	}
	
	
	// ex c
	void simpleFilteredFileCount(String acceptedExtension) {
		long fileCount = 0;
		File[] l = path.listFiles();
		for(int i = 0; i < l.length; i++) 
			if(l[i].isFile() && l[i].getName().endsWith(acceptedExtension))
				fileCount++;
		System.out.println(fileCount);
	}		
	
	// ex d
	void recursiveCount() {
		long total = recursiveCount( path );
	 	System.out.println( "#files: " + total );	
	}
	// ex d
	private long recursiveCount(File dir) {
		File[] l = dir.listFiles();
		long count = 0;
		for(int i = 0; i < l.length; i++) 
			if(l[i].isFile())
				count++;
			else if( l[i].isDirectory() ) 
				count += recursiveCount( l[i] );
		return count;
	 }
}