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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.dba;

import org.apache.cayenne.access.jdbc.BatchAction;
import org.apache.cayenne.access.jdbc.ProcedureAction;
import org.apache.cayenne.access.jdbc.SQLTemplateAction;
import org.apache.cayenne.access.jdbc.SelectAction;
import org.apache.cayenne.access.jdbc.UpdateAction;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.query.BatchQuery;
import org.apache.cayenne.query.ProcedureQuery;
import org.apache.cayenne.query.Query;
import org.apache.cayenne.query.SQLAction;
import org.apache.cayenne.query.SQLActionVisitor;
import org.apache.cayenne.query.SQLTemplate;
import org.apache.cayenne.query.SelectQuery;

/**
 * A factory of default SQLActions. Adapters usually subclass JdbcActionBuilder to provide
 * custom actions for various query types.
 * 
 * @since 1.2
 * @author Andrei Adamchik
 */
public class JdbcActionBuilder implements SQLActionVisitor {

    protected DbAdapter adapter;
    protected EntityResolver entityResolver;

    public JdbcActionBuilder(DbAdapter adapter, EntityResolver resolver) {
        this.adapter = adapter;
        this.entityResolver = resolver;
    }

    public SQLAction batchAction(BatchQuery query) {
        // check run strategy...

        // optimistic locking is not supported in batches due to JDBC driver limitations
        boolean useOptimisticLock = query.isUsingOptimisticLocking();

        boolean runningAsBatch = !useOptimisticLock && adapter.supportsBatchUpdates();
        BatchAction action = new BatchAction(query, adapter, entityResolver);
        action.setBatch(runningAsBatch);
        return action;
    }

    public SQLAction procedureAction(ProcedureQuery query) {
        return new ProcedureAction(query, adapter, entityResolver);
    }

    public SQLAction objectSelectAction(SelectQuery query) {
        return new SelectAction(query, adapter, entityResolver);
    }

    public SQLAction sqlAction(SQLTemplate query) {
        return new SQLTemplateAction(query, adapter);
    }

    public SQLAction updateAction(Query query) {
        if (query instanceof SQLTemplate) {
            return new SQLTemplateAction((SQLTemplate) query, adapter);
        }

        return new UpdateAction(query, adapter, entityResolver);
    }

    /**
     * Returns DbAdapter used associated with this action builder.
     */
    public DbAdapter getAdapter() {
        return adapter;
    }

    /**
     * Returns EntityResolver that can be used to gain access to the mapping objects.
     */
    public EntityResolver getEntityResolver() {
        return entityResolver;
    }
}