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The basic module that defines basic RxMicro annotations, required when using the REST architecture of building program systems.

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/*
 * Copyright (c) 2020. https://rxmicro.io
 *
 * 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 io.rxmicro.rest;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.SOURCE;

/**
 * Maps HTTP path variable to annotated class field.
 *
 * 
 * The RxMicro framework supports the following Java types, which can be path variables of the request model:
 * 

 *     ? extends {@link Enum}<?>
 *     {@link Boolean}
 *     {@link Byte}
 *     {@link Short}
 *     {@link Integer}
 *     {@link Long}
 *     {@link java.math.BigInteger}
 *     {@link Float}
 *     {@link Double}
 *     {@link java.math.BigDecimal}
 *     {@link Character}
 *     {@link String}
 *     {@link java.time.Instant}
 *     {@link java.util.List}<PRIMITIVE>
 * 
 *
 * @author nedis
 * @see Parameter
 * @see Header
 * @since 0.1
 */
@Documented
@Retention(SOURCE)
@Target({FIELD, METHOD, PARAMETER})
public @interface PathVariable {

    /**
     * By default, HTTP path variable name equals to field name.
     *
     * @return the HTTP path variable
     */
    String value() default "";
}