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package org.jnario.lib;

/*
 * copied from org.junit
 */
public class Assert {
	
	/**
	 * Asserts that a condition is true. If it isn't it throws an
	 * {@link AssertionError} with the given message.
	 * 
	 * @param message
	 *            the identifying message for the {@link AssertionError} (null
	 *            okay)
	 * @param condition
	 *            condition to be checked
	 */
	static public void assertTrue(String message, boolean condition) {
		if (!condition)
			fail(message);
	}
	
	/**
	 * Asserts that a condition is false. If it isn't it throws an
	 * {@link AssertionError} with the given message.
	 * 
	 * @param message
	 *            the identifying message for the {@link AssertionError} (null
	 *            okay)
	 * @param condition
	 *            condition to be checked
	 */
	static public void assertFalse(String message, boolean condition) {
		assertTrue(message, !condition);
	}
	
	/**
	 * Fails a test with the given message.
	 * 
	 * @param message
	 *            the identifying message for the {@link AssertionError} (null
	 *            okay)
	 * @see AssertionError
	 */
	static public void fail(String message) {
		if (message == null)
			throw new AssertionError();
		throw new AssertionError(message);
	}
	
	/**
	 * Asserts that an object isn't null. If it is an {@link AssertionError} is
	 * thrown with the given message.
	 * 
	 * @param message
	 *            the identifying message for the {@link AssertionError} (null
	 *            okay)
	 * @param object
	 *            Object to check or null
	 */
	static public void assertNotNull(String message, Object object) {
		assertTrue(message, object != null);
	}

	/**
	 * Asserts that an object isn't null. If it is an {@link AssertionError} is
	 * thrown.
	 * 
	 * @param object
	 *            Object to check or null
	 */
	static public void assertNotNull(Object object) {
		assertNotNull(null, object);
	}

	/**
	 * Asserts that an object is null. If it is not, an {@link AssertionError}
	 * is thrown with the given message.
	 * 
	 * @param message
	 *            the identifying message for the {@link AssertionError} (null
	 *            okay)
	 * @param object
	 *            Object to check or null
	 */
	static public void assertNull(String message, Object object) {
		assertTrue(message, object == null);
	}

	/**
	 * Asserts that an object is null. If it isn't an {@link AssertionError} is
	 * thrown.
	 * 
	 * @param object
	 *            Object to check or null
	 */
	static public void assertNull(Object object) {
		assertNull(null, object);
	}


}