Examples of org.apache.openjpa.lib.rop.ResultObjectProvider

org.apache.openjpa.lib.rop.ResultObjectProvider
Interface that allows lazy/custom instantiation of input objects. {@link ResultList} objects do not necessarily load in data allat once. Instead, they may lazily load objects as necessary. So, the lifespan of a {@link ResultObjectProvider} instance isrelated to how the application deals with processing the {@link ResultList} created with a given{@link ResultObjectProvider} instance. @author Marc Prud'hommeaux @author Patrick Linskey @author Abe White

                new ResultObjectProvider[_executors.length];
            for (int i = 0; i < _executors.length; i++)
                rops[i] = _executors[i].executeQuery(q, params, ropRange);


            boolean[] asc = _executors[0].getAscending(q);
            ResultObjectProvider rop;
            if (asc.length == 0)
                rop = new MergedResultObjectProvider(rops);
            else
                rop = new OrderingMergedResultObjectProvider(rops, asc,
                    _executors, q, params);

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        if (jfetch.getSubclassFetchMode(mapping) != EagerFetchModes.EAGER_JOIN)
            rops = new ResultObjectProvider[mappings.length];


        try {
            // check for custom loads
            ResultObjectProvider rop;
            for (int i = 0; i < mappings.length; i++) {
                rop = mappings[i].customLoad(this, subclasses, jfetch, 0,
                    Long.MAX_VALUE);
                if (rop != null) {
                    if (rops == null)

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            SQLBuffer buf = new SQLBuffer(dict).append(pq.getTargetQuery());
            Connection conn = store.getConnection();
            JDBCFetchConfiguration fetch = (JDBCFetchConfiguration)q.getContext().getFetchConfiguration();


            ResultObjectProvider rop;
            PreparedStatement stmnt = null;
            try {
                stmnt = !range.lrs ? buf.prepareStatement(conn) : buf.prepareStatement(conn, fetch, -1, -1);


                int index = 0;

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                    paramMap.put(itr.next(), params[idx]);
            }


            FetchConfiguration fetch = q.getContext().getFetchConfiguration();
            StoreContext sctx = q.getContext().getStoreContext();
            ResultObjectProvider rop;
            Object[] args;
            if (_inMem) {
                args = new Object[]{ sctx, _meta, (_subs) ? Boolean.TRUE
                    : Boolean.FALSE, null, paramMap, fetch };

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            start = 0L;
        boolean lrs = range.lrs || (fetch.getFetchBatchSize() >= 0 
            && (start != range.start || end != range.end));


        ResultObjectProvider[] rops = null;
        ResultObjectProvider rop = null;
        if (unionable) {
            Union union = _store.getSQLFactory().newUnion(
                (Select[]) sels.toArray(new Select[sels.size()]));
            BitSet[] paged = populateUnion(union, mappings, subclasses, facts,
                exps, states, ctx, lrs, eager, start, end);

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            // apply projections, order results, and filter duplicates
            results = _factory.project(_exps[0], results, ctx, params);
            results = _factory.order(_exps[0], results, ctx, params);
            results = _factory.distinct(_exps[0], coll == null, results);


            ResultObjectProvider rop = new ListResultObjectProvider(results);
            if (range.start != 0 || range.end != Long.MAX_VALUE)
                rop = new RangeResultObjectProvider(rop, range.start,range.end);
            return rop;
        }

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        Statement stmnt = conn.createStatement();
        ResultSet rs = stmnt.executeQuery("SELECT * FROM RAWSQL "
        + "ORDER BY INTFIELD");
        ResultSetResult res = new ResultSetResult(rs,
        store.getConfiguration().getDBDictionaryInstance());
        ResultObjectProvider rop = new GenericResultObjectProvider
        (RawSQL.class, store, null, res);
        ResultList rl = new EagerResultList(rop);
        check(rl, broker);
        rl.close();
        broker.close();

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        public void testLoadWithPCROP()
        throws Exception {
            
        EntityManager em = currentEntityManager();    
        Broker broker = JPAFacadeHelper.toBroker(em);
        ResultObjectProvider rop = new AbstractPCResultObjectProvider(broker) {
            private int _row = -1;


            public boolean supportsRandomAccess() {
                return true;
            }

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        Statement stmnt = conn.createStatement();
        ResultSet rs = stmnt.executeQuery("SELECT * FROM RAWSQL "
        + "ORDER BY INTFIELD");
        ResultSetResult res = new ResultSetResult(rs,
        store.getConfiguration().getDBDictionaryInstance());
        ResultObjectProvider rop = new GenericResultObjectProvider
        (RawSQL.class, store, null, res);
        ResultList rl = new EagerResultList(rop);
        check(rl, broker);
        rl.close();
        broker.close();

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        public void testLoadWithPCROP()
        throws Exception {
            
        EntityManager em = currentEntityManager();    
        Broker broker = JPAFacadeHelper.toBroker(em);
        ResultObjectProvider rop = new AbstractPCResultObjectProvider(broker) {
            private int _row = -1;


            public boolean supportsRandomAccess() {
                return true;
            }

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