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

            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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                range.end);
            List<Object> cached = cq.checkCache(key);
            if (cached != null)
                return new ListResultObjectProvider(cached);


            ResultObjectProvider rop = _ex.executeQuery(cq.getDelegate(),
                params, range);
            if (_fc.getQueryCacheEnabled())
                return cq.wrapResult(rop, key);
            else
                return rop;

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        }
      }
      
      ResultObjectProvider[] tmp = rops
                    .toArray(new ResultObjectProvider[rops.size()]);
      ResultObjectProvider result = null;
      boolean[] ascending = getAscending(q);
      boolean isAscending = ascending.length > 0;
      boolean isAggregate = ctx.isAggregate();
      boolean hasRange = ctx.getEndRange() != Long.MAX_VALUE;
      if (isAggregate) {

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


            ResultObjectProvider rop;
            PreparedStatement stmnt = null;
            try {
                // use the right method depending on sel vs. proc, lrs setting
                if (_select && !range.lrs)
                    stmnt = prepareStatement(conn, buf);

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        if (jfetch.getSubclassFetchMode(mapping) != jfetch.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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        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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