Validate.java

public class Validate {
	
	public static boolean not(boolean expression){
		return !expression;
	}
	
	public static boolean in(String value, String[] options){
		return StringUtil.in(value, options);
	}
	
	public static boolean isValidEntity(AbstractEntity entity){
		return isNotNull(entity) && isNotNull(entity.getId());
	}

	public static boolean isValidEmail(String email){
		return isNotNull(email) && StringUtil.isValidEmail(email);
	}
	
	public static boolean isNotNull(Object value){
		return !isNull(value);
	}
	
	public static boolean isNull(Object value){
		return value == null;
	}
	
	public static boolean isNullOrEquals(Object from, Object target){
		return isNull(from) || eq(from, target);
	}
	
	public static boolean isEmpty(String value){
		return isNotNull(value) && value.trim().isEmpty();
	}
	
	public static boolean isEmpty(Collection<?> collection){
		return isNull(collection) || collection.isEmpty();
	}
	
	public static boolean isNotEmpty(Collection<?> collection){
		return !isEmpty(collection);
	}
	
	public static boolean isNullOrEmpty(String value){
		return isNull(value) || value.trim().isEmpty();
	}
	
	public static boolean gt(String value, int length){
		return !isEmpty(value) && value.length() > length;
	}
	
	public static boolean eq(Object from, Object target){
		return isNotNull(from) && isNotNull(target) && from.equals(target);
	}
}