/**
  * Copyright (c): Uwe Schmidt, FH Wedel
  *
  * You may study, modify and distribute this source code
  * FOR NON-COMMERCIAL PURPOSES ONLY.
  * This copyright message has to remain unchanged.
  *
  * Note that this document is provided 'as is',
  * WITHOUT WARRANTY of any kind either expressed or implied.
  */

/**
  * abstract class for all methods
  * to find a 0 point in a given interval
  * for a real function
  */

abstract
public
class SearchZero {

  //--------------------
  // precision of solution

  protected
  double precision;

  //--------------------
  //
  // Constructors
  public
  SearchZero() {
    this(1e-10);
  }

  public
  SearchZero(double precision) {
    this.precision = precision;
  }

  //--------------------
  //
  // the method for finding a zero

  abstract
  public
  double searchZero(double x1,
		    double x2,
		    RealFunction f)
    throws NoZeroFoundException;

  //--------------------

  // performance measurement
  // count number of function calls
  // should be reset at start of every
  // call to searchZero

  protected
  int noOfCalls;

  public
  int getNoOfCalls() {
    return
      noOfCalls;
  }

}