Converts the double value to locale-independent string representation : Locale « I18N « Java






Converts the double value to locale-independent string representation

   
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

/**
 * Collection of string utilities.
 * 
 */

public class StringUtil
{

  /**
   * Converts the double value to locale-independent string representation.
   * This method works like <code>Double.toString( double )</code>, and can
   * also handle very large number like 1.234567890E16 to "12345678900000000".
   * 
   * @param d
   *            the double value to convert
   * @param fNumber
   *            the positive maximum fractional number
   * @return the locale-independent string representation.
   */

  public static String doubleToString( double d, int fNumber )
  {

    if ( fNumber < 0 )
      fNumber = 0;

    String value = Double.toString( d );
    int ePos = value.indexOf( 'E' );
    int dotPos = value.indexOf( '.' );

    // Convert the double like "1234567890000000.56789" to string, which
    // will be converted to
    // "1.23456789000E15" by Double.toString().

    if ( ePos != -1 )
    {
      // Get the exponent of this double

      String e = value.substring( ePos + 1 );
      int exp = Integer.parseInt( e );

      // Move the dot position according to the exponent

      StringBuffer sb = new StringBuffer( value.substring( 0, dotPos ) );
      if ( ePos - dotPos - 1 > exp )
      {
        // "1.23456789000E4"

        sb.append( value.substring( dotPos + 1, dotPos + 1 + exp ) );
        sb.append( '.' );
        sb.append( value.substring( dotPos + 1 + exp, ePos ) );

        // "12345.6789000"
      }
      else
      {
        // "1.23400E8"

        sb.append( value.substring( dotPos + 1, ePos ) );
        for ( int i = 0; i < exp - ( ePos - dotPos - 1 ); i++ )
          sb.append( '0' );

        // "123400000"
      }

      // "1234567890000000" will be the final one

      value = sb.toString( );
    }

    // Limit the fractional number to maximum fractional number

    int pos = value.indexOf( '.' );
    if ( pos != -1 )
    {
      if ( value.length( ) - pos - 1 > fNumber )
        value = value.substring( 0, pos + fNumber + 1 );

      // Remove the ending '0'.

      int i = 0;
      for ( ; i < fNumber; i++ )
      {
        if ( value.charAt( value.length( ) - i - 1 ) != '0' )
          break;
      }
      value = value.substring( 0, value.length( ) - i );

      // Remove the last dot

      if ( value.charAt( value.length( ) - 1 ) == '.' )
        value = value.substring( 0, value.length( ) - 1 );
    }

    return value;
  }

}

   
    
    
  








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