/**

  * Copyright 2009 Timothy Johnston 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 com.timjohnstondev.unitconverter.logic;

 import java.math.BigDecimal;

 import java.math.MathContext;

 import java.math.RoundingMode;

 import java.util.ResourceBundle;

 import javax.swing.JButton;

 import javax.swing.JTextField;

 /**

  * Utility class that contains all of the logic for dealing with the mole to mass calculations for the conversions.

  */

 public final class MolarMassLogic

 {

   private static final ResourceBundle RESOURCES = ResourceBundle

       .getBundle("com.timjohnstondev.unitconverter.view.View");

   private MolarMassLogic()

   {}

   /**

    * Performs calculation to determine the molecular weight correction factor.

    * 

    * @param massMoleField massMoleField

    * @param mass2Mole mass2Mole

    * @param selectedButton selectedButton

    * @param isMolUnitDivisor isMolUnitDivisor

    * 

    * @return the molecular weight correction factor

    */

   public static BigDecimal getMolecularWeightCorrection(final JTextField massMoleField, final JButton mass2Mole,

       final Object selectedButton, final boolean isMolUnitDivisor)

   {

     BigDecimal mwc = BigDecimal.ONE;

     if (massMoleField.isVisible() && massMoleField.getText() != null && !massMoleField.getText().equals("")

         && selectedButton != null)

     {

       final boolean isMassToMoleConversion = isMassToMoleConversion(mass2Mole, selectedButton);

       mwc = new BigDecimal(massMoleField.getText());

       if ((isMassToMoleConversion && !isMolUnitDivisor) || (!isMassToMoleConversion && isMolUnitDivisor))

       {

         final String numberLengthLimit = RESOURCES.getString("CalculationPanel.numberLengthLimit");

         final MathContext mathContext = new MathContext(Integer.parseInt(numberLengthLimit), RoundingMode.HALF_UP);

         mwc = BigDecimal.ONE.divide(mwc, mathContext);

       }

     }

     return mwc;

   }

   private static boolean isMassToMoleConversion(final JButton mass2Mole, final Object selectedButton)

   {

     boolean isMass2Mole = false;

     if (mass2Mole == selectedButton)

     {

       isMass2Mole = true;

     }

     return isMass2Mole;

   }

 }