/*
 * 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
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing, software
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 * 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.impl;

import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
import static org.jooq.impl.JSONNull.JSONNullType.ABSENT_ON_NULL;
import static org.jooq.impl.JSONNull.JSONNullType.NULL_ON_NULL;
import static org.jooq.impl.Keywords.K_ABSENT;
import static org.jooq.impl.Keywords.K_NULL;
import static org.jooq.impl.Keywords.K_ON;

import java.util.Set;

import org.jooq.Context;
import org.jooq.SQLDialect;

Author:
Lukas Eder/**
 * @author Lukas Eder
 */
final class JSONNull extends AbstractQueryPart {

    
Generated UID
/**
     * Generated UID
     */
    private static final long    serialVersionUID          = 3121287280045911346L;
    static final Set<SQLDialect> NO_SUPPORT_ABSENT_ON_NULL = SQLDialect.supportedBy(MARIADB, MYSQL);

    final JSONNullType           type;

    JSONNull(JSONNullType type) {
        this.type = type;
    }

    @Override
    public final boolean rendersContent(Context<?> ctx) {
        return !NO_SUPPORT_ABSENT_ON_NULL.contains(ctx.dialect()) && type != null;
    }

    @Override
    public final void accept(Context<?> ctx) {
        if (!NO_SUPPORT_ABSENT_ON_NULL.contains(ctx.dialect()))
            if (type == NULL_ON_NULL)
                ctx.visit(K_NULL).sql(' ').visit(K_ON).sql(' ').visit(K_NULL);
            else if (type == ABSENT_ON_NULL)
                ctx.visit(K_ABSENT).sql(' ').visit(K_ON).sql(' ').visit(K_NULL);
    }

    enum JSONNullType {
        NULL_ON_NULL, ABSENT_ON_NULL
    }
}