assert.java

用java开发的一个实施策略游戏源码 值得学习一下

/*
	Netwar
	Copyright (C) 2002  Daniel Grund, Kyle Kakligian, Jason Komutrattananon, & Brian Hibler.

	This file is part of Netwar.

	Netwar is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	Netwar is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Netwar; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package netwar.utils;

/** Class Assert
 * Used to test assertions.
 * @author Kyle Kakligian
 */
public class Assert {
	/** Throws an <B>IllegalArgumentException</B> if the given parameter is <CODE>false</CODE>.
	 * @param b The test variable.
	 * @throws IllegalArgumentException This gets thrown if <B>b</B> is <CODE>false</CODE>.
	 */	
	static public void notFalse(boolean b) throws IllegalArgumentException {
		if(b == false)
			throw new IllegalArgumentException("Assertion failed; boolean");
	}
	/** Throws an <b>IllegalArgumentException</b> if the given parameter is <CODE>null</CODE>.
	 * @param obj Object reference to test.
	 * @throws IllegalArgumentException This gets thrown if <B>obj</B> is <CODE>null</CODE>.
	 */  
	static public void notNull(Object obj) throws IllegalArgumentException {
		if(obj == null)
			throw new IllegalArgumentException("Assertion failed; null object");
	}
	/** Throws an <b>IllegalArgumentException</b> if the given parameter is <CODE>false</CODE>. The string should be an explaination.
	 * @param b The test variable.
	 * @param s This gives an explaination as to why <B>b</B> is <CODE>false</CODE>.
	 * @throws IllegalArgumentException This gets thrown if <B>b</B> is <CODE>false</CODE>.
	 */  
	static public void notFalse(boolean b, String s) throws IllegalArgumentException {
		if(b == false)
		throw new IllegalArgumentException(s);
	}
	/** Throws an <b>IllegalArgumentException</b> if the given parameter is <CODE>null</CODE>. The string should be an explaination.
	 * @param obj Object reference to test.
	 * @param s This gives an explaination as to why <B>b</B> is <CODE>null</CODE>.
	 * @throws IllegalArgumentException This gets thrown if <B>obj</B> is <CODE>null</CODE>.
	 */  
	static public void notNull(Object obj, String s) throws IllegalArgumentException {
		if(obj == null)
			throw new IllegalArgumentException(s);
	}
}