public QueryPlanCache(SessionFactoryImplementor factory) 
{
		this.factory = factory;
}

 public FilterQueryPlan getFilterQueryPlan(String filterString,
    String collectionRole,
    boolean shallow,
    Map enabledFilters) throws QueryException, MappingException 
{
		FilterQueryPlanKey key = new FilterQueryPlanKey( filterString, collectionRole, shallow, enabledFilters );
		FilterQueryPlan plan = ( FilterQueryPlan ) planCache.get ( key );
		if ( plan == null ) {
			if ( log.isTraceEnabled() ) {
				log.trace( "unable to locate collection-filter query plan in cache; generating (" + collectionRole + " : " + filterString + ")" );
			}
			plan = new FilterQueryPlan( filterString, collectionRole, shallow, enabledFilters, factory );
		}
		else {
			if ( log.isTraceEnabled() ) {
				log.trace( "located collection-filter query plan in cache (" + collectionRole + " : " + filterString + ")" );
			}
		}
		planCache.put( key, plan );
		return plan;
}

 public HQLQueryPlan getHQLQueryPlan(String queryString,
    boolean shallow,
    Map enabledFilters) throws QueryException, MappingException 
{
		HQLQueryPlanKey key = new HQLQueryPlanKey( queryString, shallow, enabledFilters );
		HQLQueryPlan plan = ( HQLQueryPlan ) planCache.get ( key );
		if ( plan == null ) {
			if ( log.isTraceEnabled() ) {
				log.trace( "unable to locate HQL query plan in cache; generating (" + queryString + ")" );
			}
			plan = new HQLQueryPlan(queryString, shallow, enabledFilters, factory );
		}
		else {
			if ( log.isTraceEnabled() ) {
				log.trace( "located HQL query plan in cache (" + queryString + ")" );
			}
		}
		planCache.put( key, plan );
		return plan;
}

 public NativeSQLQueryPlan getNativeSQLQueryPlan(NativeSQLQuerySpecification spec) 
{
		NativeSQLQueryPlan plan = ( NativeSQLQueryPlan ) planCache.get( spec );
		if ( plan == null ) {
			if ( log.isTraceEnabled() ) {
				log.trace( "unable to locate native-sql query plan in cache; generating (" + spec.getQueryString() + ")" );
			}
			plan = new NativeSQLQueryPlan( spec, factory );
		}
		else {
			if ( log.isTraceEnabled() ) {
				log.trace( "located native-sql query plan in cache (" + spec.getQueryString() + ")" );
			}
		}
		planCache.put( spec, plan );
		return plan;
}

 public ParameterMetadata getSQLParameterMetadata(String query) 
{
		ParameterMetadata metadata = ( ParameterMetadata ) sqlParamMetadataCache.get( query );
		if ( metadata == null ) {
			// for native-sql queries, the param metadata is determined outside
			// any relation to a query plan, because query plan creation and/or
			// retreival for a native-sql query depends on all of the return
			// types having been set, which might not be the case up-front when
			// param metadata would be most useful
			metadata = buildNativeSQLParameterMetadata( query );
			sqlParamMetadataCache.put( query, metadata );
		}
		return metadata;
}