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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * Licensed 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
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 */
package org.jooq;

import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.FIREBIRD_3_0;
// ...
// ...
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
// ...
// ...
// ...

import java.util.Collection;

/**
 * An intermediate step in the construction of a {@link WindowSpecification}.
 * 
 * Example: 
 * WindowSpecification spec =
 * DSL.partitionBy(BOOK.AUTHOR_ID)
 *    .orderBy(BOOK.ID)
 *    .rowsBetweenUnboundedPreceding()
 *    .andCurrentRow();
 * 
 *
 * @author Lukas Eder
 */
public interface WindowSpecificationPartitionByStep extends WindowSpecificationOrderByStep {

    /**
     * Add a PARTITION BY clause to the window specification.
     */
    @Support({ CUBRID, FIREBIRD_3_0, POSTGRES })
    WindowSpecificationOrderByStep partitionBy(Field... fields);

    /**
     * Add a PARTITION BY clause to the window specification.
     */
    @Support({ CUBRID, FIREBIRD_3_0, POSTGRES })
    WindowSpecificationOrderByStep partitionBy(Collection> fields);

    /**
     * Add a PARTITION BY 1 clause to the window specification,
     * where such a clause is required by the syntax of an RDBMS.
     * 
     * This clause is not supported as such in the CUBRID and Sybase dialects.
     * If you use it, jOOQ will simply ignore it.
     */
    @Support({ CUBRID, FIREBIRD_3_0, POSTGRES })
    WindowSpecificationOrderByStep partitionByOne();
}