/*
 * Spring JDBC Plus
 *
 * Copyright 2020-2021 NAVER Corp.
 *
 * 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.navercorp.spring.data.jdbc.plus.sql.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.core.annotation.AliasFor;

/**
 * The interface Sql function.
 *
 * @author Myeonghyeon Lee
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
public @interface SqlFunction {
	/**
	 * The constant COLUMN_NAME.
	 */
	String COLUMN_NAME = "${columnName}";

	/**
	 * Value string.
	 *
	 * @return the string
	 */
	@AliasFor("functionName")
	String value() default "COALESCE";

	/**
	 * Function name string.
	 *
	 * @return the string
	 */
	@AliasFor("value")
	String functionName() default "COALESCE";

	/**
	 * Expressions string [ ].
	 *
	 * @return the string [ ]
	 */
	String[] expressions() default {COLUMN_NAME};
}
