public CachingSpanFilter(SpanFilter filter) 
{
    this.filter = filter;
}

Parameters:

filter - Filter to cache results of

 public SpanFilterResult bitSpans(IndexReader reader) throws IOException 
{
    return getCachedResult(reader);
}

 public BitSet bits(IndexReader reader) throws IOException 
{
    SpanFilterResult result = getCachedResult(reader);
    return result != null ? result.getBits() : null;
}

 public boolean equals(Object o) 
{
    if (!(o instanceof CachingSpanFilter)) return false;
    return this.filter.equals(((CachingSpanFilter)o).filter);
}

 public int hashCode() 
{
    return filter.hashCode() ^ 0x1117BF25;
}

 public String toString() 
{
    return "CachingSpanFilter("+filter+")";
}