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/**
 * Copyright (c) 2009-2015, 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
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.jooq.impl;

import static org.jooq.impl.DSL.field;
import static org.jooq.impl.DSL.function;

import java.sql.Date;

import org.jooq.Configuration;
import org.jooq.Field;

/**
 * @author Lukas Eder
 */
class DateDiff extends AbstractFunction {

    /**
     * Generated UID
     */
    private static final long serialVersionUID = -4813228000332771961L;

    private final Field date1;
    private final Field date2;

    DateDiff(Field date1, Field date2) {
        super("datediff", SQLDataType.INTEGER, date1, date2);

        this.date1 = date1;
        this.date2 = date2;
    }

    @Override
    final Field getFunction0(Configuration configuration) {
        switch (configuration.family()) {
            case MARIADB:
            case MYSQL:
                return function("datediff", getDataType(), date1, date2);

            case DERBY:
                return field("{fn {timestampdiff}({sql_tsi_day}, {0}, {1}) }", getDataType(), date2, date1);

            case FIREBIRD:
                return field("{datediff}(day, {0}, {1})", getDataType(), date2, date1);

            case H2:
            case HSQLDB:
                return field("{datediff}('day', {0}, {1})", getDataType(), date2, date1);

            case SQLITE:
                return field("({strftime}('%s', {0}) - {strftime}('%s', {1})) / 86400", getDataType(), date1, date2);

            /* [pro] xx
            xxxx xxxxxxx
            xx [/pro] */
            case CUBRID:
            case POSTGRES:
                return field("{0} - {1}", getDataType(), date1, date2);

            /* [pro] xx
            xxxx xxxxxxx
                xxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxx xxxxxx xxxxxxxxxxxxxx xxxxxx xxxxxxx

            xxxx xxxx
            xxxx xxxxxxxxxx
            xxxx xxxxxxx
                xxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxx xxxxxx xxxxxxxxxxxxxx xxxxxx xxxxxxx

            xxxx xxxx
                xxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxxxxxxx
                       xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxxxx

            xxxx xxxxx
                xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxx xxxxxx xxxxxxx

            xx xxxx xxxxxxx xx xxxxxxx
            xxxx xxxxxxx
            xx [/pro] */
        }

        // Default implementation for equals() and hashCode()
        return date1.sub(date2).cast(Integer.class);
    }
}