java_io

package java_io;
//import java.util.Scanner;
import java.io.*;
public class input_output {

	protected static void pwd(File wd, String[] filename){
		try {
			System.out.println("Path: " + wd.getCanonicalPath());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	protected static File cd(File wd, String[] dirname){
		if (dirname[0] == ".."){
			System.out.println(wd.getParentFile());
			return wd.getParentFile();
		}

		//File directory = new File("dirname").getAbsoluteFile();
		//boolean result;

		File tmp = new File(wd, dirname[0]);
		if(tmp.isDirectory()) //minden ágat le kell írni
			return tmp;
		else
			return wd;
	}

	private static File e(File tmp) {
		// TODO Auto-generated method stub
		return null;
	}

	protected static void ls(File wd, String[] filename){
		File[] listOfFiles = wd.listFiles();
		for(int i = 0; i < wd.list().length; i++){
			System.out.println("Files: " + listOfFiles[i].getName());
		}
	}

	protected static void mkdir(File wd, String[] dirname) throws IOException{
///		boolean result = false;
		File dir = new File("dirname");//???
		try{
			if(!dir.exists()){
				dir.mkdir();
				System.out.println("Directory is created.");
				}
			else{
				System.out.println("Directory is not created.");
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}

	protected static void cp(String[] filename){
		File source = new File(filename[0]);
		File dest = new File(filename[1]);

		byte[] bytes = new byte[1024];

		try{
			if(source.exists()){
				FileInputStream fis = new FileInputStream(source);
				FileOutputStream fos = new FileOutputStream(dest);
				while(fis.read(bytes) != -1){
					fos.write(bytes);
					fos.flush();
				}
			fis.close();
			fos.close();
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
	protected static void head(int n, File wd, String[] filename){
		try{
			File t = new File (wd, filename[0]);
			FileReader fr = new FileReader("wd");
			//String s;
			BufferedReader br = new BufferedReader(fr);
			//int counter = n;
			while(n > 0 && br.readLine() != null){
				System.out.println(br);
				n--;
			}
		}
		catch(Exception e){
			System.out.println(e.getMessage());
		}
	}

public static void main(String[] args) throws IOException{
	System.out.println("Add meg a szavakat!");

	//	Scanner input = new Scanner(System.in);
	//	String array;
	//	String[] delimiter = array.split(" ");

		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
	    String line = "";
	    File wd = new File(System.getProperty("user.dir"));

	    while (line != "0"){
	    	line = br.readLine();
	    	if(line == null) break;
	    	String[] parts = line.split(" "); // parts[0] - parancs, többi arg.

	    	if(parts[0].equals("exit")){
	    		break;
	    	}
	    	if(parts[0].equals("pwd")){
	    		pwd(wd, parts);
	    	}
	    	if(parts[0].equals("cd")){
	    		cd(wd, parts);
	    	}
	    	if(parts[0].equals("ls")){
	    		ls(wd, parts);
	    	}
	    	if(parts[0].equals("mkdir")){
	    		mkdir(wd, parts);
	    	}
	    	if(parts[0].equals("cp")){
	    		cp(parts);
	    	}
	    	if(parts[0].equals("head")){
	    		head(10, wd, parts);
	    	}
	    	System.out.println();
	    }
	}
}