content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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.wst.jsdt.internal.ui.javaeditor;
  
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.text.source.Annotation;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.ui.texteditor.IAnnotationImageProvider;
  import org.eclipse.wst.jsdt.internal.ui.JavaPluginImages;
  
  /**
   * Image provider for {@link org.eclipse.wst.jsdt.internal.ui.javaeditor.OverrideIndicatorManager.OverrideIndicator} annotations.
   *
   * 
   */
  public class OverrideIndicatorImageProvider implements IAnnotationImageProvider {
  
  	/*
  	 * @see org.eclipse.ui.texteditor.IAnnotationImageProvider#getManagedImage(org.eclipse.jface.text.source.Annotation)
  	 */
  	private static final String OVERRIDE_IMG_DESC_ID= "JavaPluginImages.DESC_OBJ_OVERRIDES"; //$NON-NLS-1$
  	private static final String OVERWRITE_IMG_DESC_ID= "JavaPluginImages.DESC_OBJ_IMPLEMENTS"; //$NON-NLS-1$
  	public Image getManagedImage(Annotation annotation) {
  		return null;
  	}
  
  	/*
  	 * @see org.eclipse.ui.texteditor.IAnnotationImageProvider#getImageDescriptorId(org.eclipse.jface.text.source.Annotation)
  	 */
  	public String getImageDescriptorId(Annotation annotation) {
  		if (!isImageProviderFor(annotation))
  			return null;
  
  		if (isOverwriting(annotation))
  			return OVERWRITE_IMG_DESC_ID;
  		else
  			return OVERRIDE_IMG_DESC_ID;
  	}
  
  	/*
  	 * @see org.eclipse.ui.texteditor.IAnnotationImageProvider#getImageDescriptor(java.lang.String)
  	 */
  	public ImageDescriptor getImageDescriptor(String imageDescritporId) {
  		if (OVERWRITE_IMG_DESC_ID.equals(imageDescritporId))
  			return JavaPluginImages.DESC_OBJ_IMPLEMENTS;
  		else if (OVERRIDE_IMG_DESC_ID.equals(imageDescritporId))
  			return JavaPluginImages.DESC_OBJ_OVERRIDES;
  
  		return null;
  	}
  
  	private boolean isImageProviderFor(Annotation annotation) {
  		return annotation != null && OverrideIndicatorManager.ANNOTATION_TYPE.equals(annotation.getType());
  	}
  
  	private boolean isOverwriting(Annotation annotation) {
  		return ((OverrideIndicatorManager.OverrideIndicator)annotation).isOverwriteIndicator();
  	}
  }
  