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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */
package org.jooq.impl;

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

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

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

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

    private final Field           string;
    private final Field count;

    Repeat(Field string, Field count) {
        super("rpad", SQLDataType.VARCHAR, string, count);

        this.string = string;
        this.count = count;
    }

    @Override
    final Field getFunction0(Configuration configuration) {
        switch (configuration.dialect().family()) {
            /* [pro] xx
            xxxx xxxxxxxxx
            xxxx xxxxxxx
            xxxx xxxxxxx
            xx [/pro] */
            case FIREBIRD:
                return DSL.rpad(string, DSL.length(string).mul(count), string);

            // Simulation of REPEAT() for SQLite currently cannot be achieved
            // using RPAD() above, as RPAD() expects characters, not strings
            // Another option is documented here, though:
            // http://stackoverflow.com/questions/11568496/how-to-simulate-repeat-in-sqlite
            case SQLITE:
                return DSL.field("replace(substr(quote(zeroblob(({0} + 1) / 2)), 3, {0}), '0', {1})", String.class, count, string);

            /* [pro] xx
            xxxx xxxx
            xxxx xxxxxxxxxx
                xxxxxx xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxxxxxx xxxxxxx

            xx [/pro] */
            default:
                return function("repeat", SQLDataType.VARCHAR, string, count);
        }
    }
}