VariableNotSetException.java

/*
 * #!
 * Ontopia Navigator
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * !#
 */

package net.ontopia.topicmaps.nav2.core;

/**
 * INTERNAL: Exception for a problem occurring when using the Navigator
 * Tag Library.  Used when referring to undefined variables.
 *
 * @since 1.3
 */
public class VariableNotSetException extends RuntimeException {

  /**
   * INTERNAL: constructor with empty error message.
   */
  public VariableNotSetException() {
    super();
  }
  
  /**
   * INTERNAL: constructor with the name of the variable which is not set.
   */
  public VariableNotSetException(String varName) {
    super("Stopped page processing, because variable " +
          (varName != null ? "'"+varName+"'" : "{unnamed}") +
          " is not set.");
  }
  
}