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JFoenix
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.jfoenix.validation;

import java.text.NumberFormat;
import java.text.ParseException;
import java.text.ParsePosition;

import com.jfoenix.validation.base.ValidatorBase;

import javafx.beans.DefaultProperty;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.control.TextInputControl;
import javafx.util.converter.NumberStringConverter;

/**
 * An example of Number field validation, that is applied on text input controls such as
 * {@link TextField} and {@link TextArea}
 *
 * @author Shadi Shaheen
 * @version 1.0
 * @since 2016-03-09
 */
@DefaultProperty(value = "icon")
public class NumberValidator extends ValidatorBase
{

   private NumberStringConverter numberStringConverter = new NumberStringConverter()
   {
      @Override
      public Number fromString(String string)
      {
         try
         {
            if (string == null)
            {
               return null;
            }
            string = string.trim();
            if (string.length() < 1)
            {
               return null;
            }
            // Create and configure the parser to be used
            NumberFormat parser = getNumberFormat();
            ParsePosition parsePosition = new ParsePosition(0);
            Number result = parser.parse(string, parsePosition);
            final int index = parsePosition.getIndex();
            if (index == 0 || index < string.length())
            {
               throw new ParseException("Unparseable number: \"" + string + "\"", parsePosition.getErrorIndex());
            }
            return result;
         }
         catch (ParseException ex)
         {
            throw new RuntimeException(ex);
         }
      }
   };

   public NumberValidator()
   {
   }

   public NumberValidator(String message)
   {
      super(message);
   }

   public NumberValidator(NumberStringConverter numberStringConverter)
   {
      this.numberStringConverter = numberStringConverter;
   }

   public NumberValidator(String message, NumberStringConverter numberStringConverter)
   {
      super(message);
      this.numberStringConverter = numberStringConverter;
   }

   /**
    * {@inheritDoc}
    */
   @Override
   protected void eval()
   {
      if (srcControl.get() instanceof TextInputControl)
      {
         evalTextInputField();
      }
   }

   private void evalTextInputField()
   {
      TextInputControl textField = (TextInputControl) srcControl.get();
      String text = textField.getText();
      try
      {
         hasErrors.set(false);
         if (!text.isEmpty())
            numberStringConverter.fromString(text);
      }
      catch (Exception e)
      {
         hasErrors.set(true);
      }
   }

   public NumberStringConverter getNumberStringConverter()
   {
      return numberStringConverter;
   }

   public void setNumberStringConverter(NumberStringConverter numberStringConverter)
   {
      this.numberStringConverter = numberStringConverter;
   }
}