AbstractExecutionDataContentProvider.java

/*******************************************************************************
 * Copyright (c) 2006, 2016 Mountainminds GmbH & Co. KG and Contributors
 * 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:
 *    Marc R. Hoffmann - initial API and implementation
 *    
 ******************************************************************************/
package com.mountainminds.eclemma.internal.ui.editors;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.IPropertyListener;

/**
 * Base class for content providers for {@link ExecutionDataContent}. It handles
 * the viewer update.
 */
abstract class AbstractExecutionDataContentProvider implements
    IStructuredContentProvider, IPropertyListener {

  private Viewer viewer;

  public final Object[] getElements(Object inputElement) {
    final ExecutionDataContent content = (ExecutionDataContent) inputElement;
    return getElements(content);
  }

  public final void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    this.viewer = viewer;
    if (oldInput != null) {
      ((ExecutionDataContent) oldInput).removePropertyListener(this);
    }
    if (newInput != null) {
      ((ExecutionDataContent) newInput).addPropertyListener(this);
    }
  }

  public final void dispose() {
  }

  public final void propertyChanged(Object source, int propId) {
    viewer.refresh();
  }

  protected abstract Object[] getElements(ExecutionDataContent content);

}