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Empowering Model Driven Architecture in J2EE applications
There is a newer version: 2.4.1
package tools.xor.view;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import tools.xor.service.DataStore;
import tools.xor.util.ApplicationConfiguration;
import tools.xor.util.Constants;
import tools.xor.util.InterQuery;

public class QueryJoinAction implements Action
{
    Set edgesToProcess;

    public final static String JOIN_TABLE_NAME;

    static {
        if (ApplicationConfiguration.config().containsKey(Constants.Config.QUERY_JOIN_TABLE)) {
            JOIN_TABLE_NAME = ApplicationConfiguration.config().getString(Constants.Config.QUERY_JOIN_TABLE);
        } else {
            JOIN_TABLE_NAME = Query.QUERY_JOIN_TABLENAME;
        }
    }

    public QueryJoinAction(Set edgesToProcess) {
        this.edgesToProcess = edgesToProcess;
    }

    public static boolean needsQueryJoinTable(QueryTree child) {
        boolean result = false;

        View view = child.getView();
        if(view.isCustom() && view.getUserOQLQuery() == null) {
            if(view.getNativeQuery() == null || view.getNativeQuery().contains(JOIN_TABLE_NAME)) {
                result = true;
            }
        }

        return result;
    }

    @Override public void execute (AbstractDispatcher dispatcher, QueryTreeInvocation qti, DataStore po)
    {
        // To make it work with all types of parent queries, we
        // will batch insert the values into the temp table
        // The ids are not necessarily the root of the query tree as it depends on the
        // source of the InterQuery edge

        // Child queries need to refer to the session id/invocation id while referring to the parent ids

        Set processed = new HashSet<>();
        for(InterQuery edge: edgesToProcess) {
            if(processed.contains(edge.getSource())) {
                continue;
            }

            View view = edge.getEnd().getView();
            if(view instanceof AggregateView && ((AggregateView)view).getResults() != null) {
                continue;
            }

            QueryFragment source = edge.getSource();
            String invocationId = qti.getOrCreateInvocationId(edge.getStart());
            Set ids = qti.getParentIds(edge);

            // perform the insert (will choose the correct id column based on the type of the id object)
            // We do this only if the parent query has not already populated
            QueryTree queryTree = edge.getStart();
            if(queryTree.getView() == null || !queryTree.getView().isTempTablePopulated()) {
                if(dispatcher instanceof ParallelDispatcher) {
                    throw new RuntimeException("temp table results do not work with parallel dispatcher. Use serial dispatcher by calling ClassUtil.setParallelDispatch with false.");
                }
                po.populateQueryJoinTable(invocationId, ids);
            }

            processed.add(source);
        }
    }

    @Override public Action copy (Object context)
    {
        Map edgeMap = (Map)context;

        Set edges = new HashSet<>();
        for(InterQuery edge: edgesToProcess) {
            if(!edgeMap.containsKey(edge)) {
                throw new RuntimeException("Unable to find edge mapping in the copy");
            }

            edges.add(edgeMap.get(edge));
        }

        return new QueryJoinAction(edges);
    }
}