package net.avcompris.guixer.core;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   import java.io.IOException;
   
   final class SwitchToNullImpl implements SwitchTo {
   
   	private final Command underlyingCommand;
  
  	public SwitchToNullImpl(final Command underlyingCommand) {
  
  		this.underlyingCommand = checkNotNull(underlyingCommand, "underlyingCommand");
  	}
  
  	@Override
  	public Command defaultContent() throws IOException {
  
  		// do nothing
  
  		return underlyingCommand;
  	}
  
  	@Override
  	public Command parentFrame() throws IOException {
  
  		// do nothing
  
  		return underlyingCommand;
  	}
  
  	@Override
  	public Command frame(final String name) throws IOException {
  
  		// do nothing
  
  		return underlyingCommand;
  	}
  }