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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.openjpa.kernel.exps;

/**
 * Query value representing a subquery.
 *
 * @author Abe White
 * @since 0.3.2
 */
public interface Subquery
    extends Value {

    /**
     * Return the candidate alias for this subquery.
     */
    String getCandidateAlias();

    /*
     * Set the candidate alias for this subquery.
     */
    void setSubqAlias(String subqAlias);

    /*
     * Return the subqAlias
     */
    String getSubqAlias();

    /**
     * Set the parsed subquery.
     */
    void setQueryExpressions(QueryExpressions query);

    Object getSelect();
}