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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
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  
  package org.apache.cayenne.modeler.dialog;
  
  import java.awt.Component;
  import javax.swing.JOptionPane;
  
  public class UnsavedChangesDialog {
  
      private static final String SAVE_AND_CLOSE = "Save Changes";
      private static final String CLOSE_WITHOUT_SAVE = "Discard Changes";
      private static final String CANCEL = "Cancel";
  
      protected Component parent;
      protected String result = CANCEL;
  
      public UnsavedChangesDialog(Component parent) {
          this.parent = parent;
      }
      
      public void show() {
          JOptionPane pane = new JOptionPane(
                  "You have unsaved changes. Do you want to save them?",
                  JOptionPane.QUESTION_MESSAGE);
          pane.setOptions(new Object[] {SAVE_AND_CLOSE, CLOSE_WITHOUT_SAVE, CANCEL});
          pane.setInitialValue(SAVE_AND_CLOSE);
  
          pane.createDialog(parent, "Unsaved Changes").setVisible(true);
          Object selectedValue = pane.getValue();
          result = CANCEL;
          if (SAVE_AND_CLOSE.equals(selectedValue)) {
              result = SAVE_AND_CLOSE;
          } else if (CLOSE_WITHOUT_SAVE.equals(selectedValue)) {
              result = CLOSE_WITHOUT_SAVE;
          }
      }
  
      public boolean shouldSave() {
          return SAVE_AND_CLOSE.equals(result);
      }
  
      public boolean shouldNotSave() {
          return CLOSE_WITHOUT_SAVE.equals(result);
      }
  
      public boolean shouldCancel() {
          return result == null || CANCEL.equals(result);
      }
  }
  
  