A brainstorm for fetching MetaData results for paging from a Pipe

Pipe.java

public interface Pipe<T> {
  //snip
  
  /**
   * These methods MUST add a result to a Map so that a paging context can be looked up
   */ 
  public List<T> read(); 
  
  public List<T> readWithFilter(ReadFilter filter); 
  
  
  /**
   *  If a result had a paging context, fetch the context.
  */
  public PagingContext getContext(List<T> result);
    
  }

Implementations of Pipe will be free to choose how they extract the PagingContext and how they store it. A WeakHashMap is probably one of the better structures to use.