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package net.eusashead.parquet.util;

import java.util.Collection;

public class Assert {

	public static void notNull(Object object) {
		notNull(object, "Parameter cannot be null.");
	}

	public static void notNull(Object object, String message) {
		if (object == null) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void isNull(Object object) {
		isNull(object, "Parameter must be null.");
	}

	public static void isNull(Object object, String message) {
		if (object != null) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void noNullElement(Object[] target) {
		noNullElement(target, "Array must have no null elements.");
	}

	public static void noNullElement(Object[] target, String message) {
		if (target != null) {
			for (Object field : target) {
				if (field == null) {
					throw new IllegalArgumentException(message);
				}
			}
		}
	}

	public static void notEmpty(Object[] target) {
		notEmpty(target, "Parameter have length greater than zero.");
	}

	public static void notEmpty(Object[] target, String message) {
		notNull(target);
		if (target.length == 0) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void greaterThan(int i, int obj) {
		greaterThan(i, obj, String.format("Parameter must be greater than %s", i));
	}

	public static void greaterThan(int i, int obj, String message) {
		if (obj <= i) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void greaterThanEqual(int i, int obj) {
		greaterThanEqual(i, obj, String.format("Parameter must be greater than or equal to %s", i));
	}

	public static void greaterThanEqual(int i, int obj, String message) {
		if (obj < i) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void lessThan(int i, int obj) {
		lessThan(i, obj, String.format("Parameter must be less than %s", i));
	}

	public static void lessThan(int i, int obj, String message) {
		if (obj >= i) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void typeOf(Class clazz, Object object) {
		typeOf(clazz, object, String.format("Object %s is not an instance of %s", object, clazz));
	}

	public static void typeOf(Class clazz, Object object, String message) {
		if (!object.getClass().equals(clazz)) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void notEmpty(String target) {
		notEmpty(target, "String cannot be null or empty.");
	}

	public static void notEmpty(String target, String message) {
		if (target == null || target.length() == 0) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void equals(Number j, Number i) {
		equals(j, i, String.format("Argument is not equal to ", i));
	}

	public static void equals(Number j, Number i, String message) {
		if (!j.equals(i)) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void isTrue(boolean value) {
		isTrue(value, "Argument must be true");
	}
	
	public static void isTrue(boolean value, String message) {
		if (!value) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void notEmpty(Collection target, String message) {
		if (target == null || target.size() == 0) {
			throw new IllegalArgumentException(message);
		}
	}

	public static void noNullElement(Collection target, String message) {
		if (target != null) {
			for (Object field : target) {
				if (field == null) {
					throw new IllegalArgumentException(message);
				}
			}
		}
		
	}

}