import org.eclipse.ui.part.IContributedContentsView; //导入依赖的package包/类
/**
 * @return the {@link IDiagramEditor} diagram editor.
 */
protected IDiagramEditor getDiagramEditor() {
	IWorkbenchPart part = getPart();
	if (part instanceof IContributedContentsView) {
	  IContributedContentsView contributedView = (IContributedContentsView) part
         .getAdapter(IContributedContentsView.class);
     if (contributedView != null) {
       part = contributedView.getContributingPart();
     }
	}
	
	if (part instanceof IDiagramEditor) {
		return (IDiagramEditor) part;
	}
	return null;
}
 

import org.eclipse.ui.part.IContributedContentsView; //导入依赖的package包/类
@Override
public boolean appliesTo(IWorkbenchPart part, ISelection selection) {
	if (part instanceof ContentOutline) {
		ContentOutline outline = (ContentOutline)part;
		IContributedContentsView v = (IContributedContentsView)outline.getAdapter(IContributedContentsView.class);
		if (v!=null)
			part = v.getContributingPart();
	}
	editor = (DiagramEditor)part.getAdapter(DiagramEditor.class);
	
	if (editor!=null) {
		return true;
	}
	return false;
}
 

import org.eclipse.ui.part.IContributedContentsView; //导入依赖的package包/类
@Override
public Object getAdapter(@SuppressWarnings("rawtypes") Class adapter) {
    if (adapter == IContributedContentsView.class) {
        return this;
    }
    return super.getAdapter(adapter);
}
 

import org.eclipse.ui.part.IContributedContentsView; //导入依赖的package包/类
public Object getAdapter( Class key )
{
	if ( key == IContributedContentsView.class )
		return new IContributedContentsView( ) {

			public IWorkbenchPart getContributingPart( )
			{
				return getCurrentContributingPart( );
			}
		};
	return super.getAdapter( key );
}
 

import org.eclipse.ui.part.IContributedContentsView; //导入依赖的package包/类
public Object getAdapter( Class key )
{
	if ( key == IContributedContentsView.class )
	{
		return new IContributedContentsView( ) {

			public IWorkbenchPart getContributingPart( )
			{
				return getCurrentContributingPart( );
			}
		};
	}
	return super.getAdapter( key );
}