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/*
 *
 * Copyright (c) 2006-2020, Speedment, Inc. 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.
 */
package com.speedment.runtime.compute.trait;

import com.speedment.runtime.compute.expression.Expression;

/**
 * Trait for expressions that has {@link #toUpperCase()} and
 * {@link #toLowerCase()} operations.
 *
 * @author Emil Forslund
 * @since  3.1.0
 */
public interface HasCase> {

    /**
     * Returns an expression that is equivalent to this expression, except that
     * results are always in upper-case letters.
     *
     * @return  the upper case expression
     */
    RESULT toUpperCase();

    /**
     * Returns an expression that is equivalent to this expression, except that
     * results are always in lower-case letters.
     *
     * @return  the lower case expression
     */
    RESULT toLowerCase();

}