doublefix.java

很棒的web服务器源代码

/*
 *  DoubleFix.java
 *
 *  Copyright 1997 Massachusetts Institute of Technology.
 *  All Rights Reserved.
 *
 *  Author: Ora Lassila
 *
 *  $Id: DoubleFix.java,v 1.2 1998/01/22 13:08:46 bmahe Exp $
 */

package org.w3c.tools.sexpr;

public class DoubleFix {

  /**
   * A fix for Double.valueOf in JDK 1.0.2
   */
  public static Double valueOf(String rep) // Double.valueOf is buggy in 1.0.2
    throws NumberFormatException
  {
    String s = rep.trim();
    int point = s.indexOf('.');
    if (point == -1)
      throw new NumberFormatException();
    double whole = 0;
    if (point > 0)
      whole = (double)Integer.parseInt(s.substring(0, point));
    double fraction = 0;
    if (point < s.length() - 1)
      fraction = (double)Integer.parseInt(s.substring(point + 1));
    else if (point == 0 || !Character.isDigit(s.charAt(point + 1)))
      throw new NumberFormatException();
    int m;
    for (m = 10; m < fraction; m *= 10);
    return new Double(whole + fraction / (double)m);
  }

}