--- /dev/null
+/*
+ * 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();
+}
+
+}
