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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
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.jooq.impl;

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

/**
 * @author Lukas Eder
 */
final class Nvl extends AbstractFunction {

    /**
     * Generated UID
     */
    private static final long serialVersionUID = -7273879239726265322L;

    private final Field    arg1;
    private final Field    arg2;

    Nvl(Field arg1, Field arg2) {
        super("nvl", arg1.getDataType(), arg1, arg2);

        this.arg1 = arg1;
        this.arg2 = arg2;
    }

    @Override
    final Field getFunction0(Configuration configuration) {
        switch (configuration.family()) {









            case H2:
            case HSQLDB:
                return DSL.field("{nvl}({0}, {1})", getDataType(), arg1, arg2);

            case DERBY:
            case POSTGRES:
                return DSL.field("{coalesce}({0}, {1})", getDataType(), arg1, arg2);

            case MARIADB:
            case MYSQL:
            case SQLITE:
                return DSL.field("{ifnull}({0}, {1})", getDataType(), arg1, arg2);

            default:
                return DSL.when(arg1.isNotNull(), arg1).otherwise(arg2);
        }
    }
}