missingparameterexception.java

peersim仿真chord协议的测试过的环境

/*
 * Copyright (c) 2003-2005 The BISON Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

package peersim.config;

/**
* Exception thrown to indicate that a
* configuration property is not defined. It is thrown exclusively by
* {@link Configuration}, since it is the only class that has access to the
* set of defined properties. 
 */
public class MissingParameterException extends RuntimeException {

// ================== initialization =====================================
// =======================================================================

MissingParameterException(String name) {

	super("Parameter \"" + name + "\" not found.");
}

MissingParameterException(String name, String motivation) {

	super("Parameter \"" + name + "\" not found " + motivation);
}

// ================== methods ============================================
// =======================================================================

/**
* Extends message with info from stack trace.
* It tries to guess what class called {@link Configuration} and
* adds relevant info from the stack trace about it to the message.
*/
public String getMessage() {
	
	StackTraceElement[] stack = getStackTrace();

	// Search the element that invoked Configuration
	// It's the first whose class is different from Configuration
	int pos;
	for (pos=0; pos < stack.length; pos++) {
		if (!stack[pos].getClassName().equals(
			Configuration.class.getName()))
			break;
	}

	return super.getMessage()+"\nAt "+
		getStackTrace()[pos].getClassName()+"."+
		getStackTrace()[pos].getMethodName()+":"+
		getStackTrace()[pos].getLineNumber();
}

/**
 * Returns the exception message without stack trace information
 */
public String getShortMessage()
{
	return super.getMessage();
}

}