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 *  or more contributor license agreements.  See the NOTICE file
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 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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package org.apache.cayenne.access;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.query.DeleteBatchQuery;
import org.apache.cayenne.query.InsertBatchQuery;

/**
 * A sync bucket that holds flattened queries.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
class DataDomainFlattenedBucket {

    final DataDomainFlushAction parent;
    final Map flattenedInsertQueries;
    final Map flattenedDeleteQueries;

    DataDomainFlattenedBucket(DataDomainFlushAction parent) {
        this.parent = parent;
        this.flattenedInsertQueries = new HashMap();
        this.flattenedDeleteQueries = new HashMap();
    }

    boolean isEmpty() {
        return flattenedInsertQueries.isEmpty() && flattenedDeleteQueries.isEmpty();
    }

    void addFlattenedInsert(DbEntity flattenedEntity, FlattenedArcKey flattenedInsertInfo) {

        InsertBatchQuery relationInsertQuery = (InsertBatchQuery) flattenedInsertQueries
                .get(flattenedEntity);

        if (relationInsertQuery == null) {
            relationInsertQuery = new InsertBatchQuery(flattenedEntity, 50);
            flattenedInsertQueries.put(flattenedEntity, relationInsertQuery);
        }

        DataNode node = parent.getDomain().lookupDataNode(flattenedEntity.getDataMap());
        Map flattenedSnapshot = flattenedInsertInfo.buildJoinSnapshotForInsert(node);
        relationInsertQuery.add(flattenedSnapshot);
    }

    void addFlattenedDelete(DbEntity flattenedEntity, FlattenedArcKey flattenedDeleteInfo) {

        DeleteBatchQuery relationDeleteQuery = (DeleteBatchQuery) flattenedDeleteQueries
                .get(flattenedEntity);
        if (relationDeleteQuery == null) {
            boolean optimisticLocking = false;
            relationDeleteQuery = new DeleteBatchQuery(flattenedEntity, 50);
            relationDeleteQuery.setUsingOptimisticLocking(optimisticLocking);
            flattenedDeleteQueries.put(flattenedEntity, relationDeleteQuery);
        }

        DataNode node = parent.getDomain().lookupDataNode(flattenedEntity.getDataMap());
        List flattenedSnapshots = flattenedDeleteInfo.buildJoinSnapshotsForDelete(node);
        if (!flattenedSnapshots.isEmpty()) {
            Iterator snapsIt = flattenedSnapshots.iterator();
            while (snapsIt.hasNext()) {
                relationDeleteQuery.add((Map) snapsIt.next());
            }
        }
    }

    void appendInserts(Collection queries) {
        if (!flattenedInsertQueries.isEmpty()) {
            queries.addAll(flattenedInsertQueries.values());
        }
    }

    void appendDeletes(Collection queries) {
        if (!flattenedDeleteQueries.isEmpty()) {
            queries.addAll(flattenedDeleteQueries.values());
        }
    }
}