Helper.java

package pl.shockah;

import java.io.File;
import java.nio.charset.Charset;
import java.util.ArrayList;

public class Helper {
	public static final Charset utf8 = Charset.forName("UTF-8");
	
	@SafeVarargs
	public static <T> boolean equalsOR(T instance, T... compareWith) {
		for (T t : compareWith) if (instance.equals(t)) return true;
		return false;
	}
	@SafeVarargs
	public static <T> boolean equalsAND(T instance, T... compareWith) {
		for (T t : compareWith) if (!instance.equals(t)) return false;
		return true;
	}
	
	@SuppressWarnings("unchecked") public static <T, S extends T> ArrayList<S> getAllOfType(ArrayList<T> list, Class<S> type) {
		ArrayList<S> newList = new ArrayList<S>();
		for (T object : list) if (type.isInstance(object)) newList.add((S)object);
		return newList;
	}
	public static <T, S extends T> ArrayList<T> removeAllOfType(ArrayList<T> list, Class<S> type) {
		ArrayList<T> newList = new ArrayList<T>();
		for (T object : list) if (!type.isInstance(object)) newList.add(object);
		return newList;
	}
	
	public static int countCharOccurences(String string, char needle) {
		int count = 0;
		for (int i = 0; i < string.length(); i++) if (string.charAt(i) == needle) count++;
		return count;
	}
	
	public static String getFilenameExt(File file) {
		String name = file.getName();
		if (name.contains(".")) {
			int index = name.lastIndexOf(".");
			return name.substring(index+1).toLowerCase();
		}
		return "";
	}
	
	public static void sleep(long ms) {
		try {
			Thread.sleep(ms);
		} catch (Exception e) {e.printStackTrace();}
	}
}