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/*******************************************************************************
 * Copyright (c) 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

package org.eclipse.ui.internal;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.HandlerEvent;

/**
 * Abstract base class that provides the enabled state, where changing the state
 * fires the HandlerEvent.
 * 
 * @since 3.3
 */
public abstract class AbstractEnabledHandler extends AbstractHandler {

  private boolean enabled = true;

  /*
   * (non-Javadoc)
   * 
   * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
   */
  public boolean isEnabled() {
    return enabled;
  }

  protected void setEnabled(boolean isEnabled) {
    if (enabled != isEnabled) {
      enabled = isEnabled;
      fireHandlerChanged(new HandlerEvent(this, true, false));
    }
  }
}
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