NoSuchPredicateException.java

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

package org.aitools.programd.predicates;

/**
 * Indicates that there is no predicate with a requested name.
 */
public class NoSuchPredicateException extends Exception {

  /**
   * 
   */
  private static final long serialVersionUID = 1L;

  /** The name for which there was no predicate. */
  private static String name;

  /** The index at which there was no value. */
  private static int index = -1;

  /**
   * Constructs a new NoSuchPredicateException for the given name.
   * 
   * @param predicateName the name for which there was no predicate
   */
  public NoSuchPredicateException(String predicateName) {
    NoSuchPredicateException.name = predicateName;
  }

  /**
   * Constructs a new NoSuchPredicateException for the given name and index.
   * 
   * @param predicateName the name for which there was no predicate with a value at the given index
   * @param predicateIndex the index at which there was no value
   */
  public NoSuchPredicateException(String predicateName, int predicateIndex) {
    NoSuchPredicateException.name = predicateName;
    NoSuchPredicateException.index = predicateIndex;
  }

  /**
   * @see java.lang.Throwable#getMessage()
   */
  @Override
  public String getMessage() {
    if (index != -1) {
      return "No predicate with name \"" + name + "\" with a value at index " + index + ".";
    }
    // (otherwise...)
    return "No predicate with name \"" + name + "\".";
  }
}