/*
    * License : The MIT License
    * Copyright(c) 2019 Olyutorskii
    */
   
   package io.github.olyutorskii.quetexj;
   
   import java.awt.event.ActionEvent;
   import java.util.Objects;
  import javax.swing.AbstractAction;
  import javax.swing.text.BadLocationException;
  import javax.swing.text.Document;
  
  /**
   * Clear document action.
   */
  @SuppressWarnings("serial")
  class ClearDocumentAction extends AbstractAction {
  
      private final Document document;
  
  
      /**
       * Constructor.
       *
       * @param document target document
       */
      ClearDocumentAction(Document document) {
          super();
  
          Objects.requireNonNull(document);
          this.document = document;
  
          return;
      }
  
      /**
       * Receive clear document event.
       */
      private void eventClearDocument() {
          int len = this.document.getLength();
          try {
              this.document.remove(0, len);
          } catch (BadLocationException e) {
              assert false;
          }
  
          return;
      }
  
      /**
       * {@inheritDoc}
       *
       * @param ev {@inheritDoc}
       */
      @Override
      public void actionPerformed(ActionEvent ev) {
          // assert EventQueue.isDispatchThread();
          eventClearDocument();
          return;
      }
  
  }