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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
   *
   *    https://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
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   ****************************************************************/
  package org.apache.cayenne.modeler.util;
  
  import org.apache.cayenne.modeler.dialog.validator.ValidatorDialog;
  
  import javax.swing.JTextField;
  import java.awt.event.FocusEvent;
  import java.awt.event.FocusListener;
  import java.util.function.Function;
  import java.util.function.Predicate;
  
  /**
   * @since 4.2
   */
  public class JTextFieldValidator implements FocusListener {
  
      private final JTextField jTextField;
      private final Predicate<String> validator;
      private final Function<String, String> message;
  
      static public void addValidation(JTextField field, Predicate<String> validator, Function<String, String> message) {
          JTextFieldValidator validationListener
                  = new JTextFieldValidator(field, validator, message);
          field.addFocusListener(validationListener);
      }
  
      static public void addValidation(JTextField field, Predicate<String> validator, String message) {
          addValidation(field, validator, text -> message);
      }
  
      static public void addValidation(JTextField field, Predicate<String> validator) {
          addValidation(field, validator, text -> "There are illegal chars in this field");
      }
  
      JTextFieldValidator(JTextField jTextField, Predicate<String> validator, Function<String, String> message) {
          this.jTextField = jTextField;
          this.validator = validator;
          this.message = message;
      }
  
      @Override
      public void focusGained(FocusEvent e) {
      }
  
      @Override
      public void focusLost(FocusEvent e) {
          String text = jTextField.getText();
          if(validator.test(text)) {
              jTextField.setBackground(ValidatorDialog.WARNING_COLOR);
              jTextField.setToolTipText(message.apply(text));
          }
      }
  }
  