/*
 * Copyright 2015 Netflix, Inc.
 *
 * 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 feign;

import java.lang.annotation.Retention;
import java.util.List;
import java.util.Map;

import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * A template parameter that can be applied to a Map that contains query
 * parameters, where the keys are Strings that are the parameter names and the
 * values are the parameter values. The queries specified by the map will be
 * applied to the request after all other processing, and will take precedence
 * over any previously specified query parameters. It is not necessary to
 * reference the parameter map as a variable. <br>
 * <br>
 * <pre>
 * ...
 * &#64;RequestLine("POST /servers")
 * void servers(&#64;QueryMap Map<String, String>);
 * ...
 *
 * &#64;RequestLine("GET /servers/{serverId}?count={count}")
 * void get(&#64;Param("serverId") String serverId, &#64;Param("count") int count, &#64;QueryMap Map<String, Object>);
 * ...
 * </pre>
 * The annotated parameter must be an instance of {@link Map}, and the keys must
 * be Strings. The query value of a key will be the value of its toString
 * method, except in the following cases:
 * <br>
 * <br>
 * <ul>
 * <li>if the value is null, the value will remain null (rather than converting
 * to the String "null")
 * <li>if the value is an {@link Iterable}, it is converted to a {@link List} of
 * String objects where each value in the list is either null if the original
 * value was null or the value's toString representation otherwise.
 * </ul>
 * <br>
 * Once this conversion is applied, the query keys and resulting String values
 * follow the same contract as if they were set using
 * {@link RequestTemplate#query(String, String...)}.
 */
@Retention(RUNTIME)
@java.lang.annotation.Target(PARAMETER)
public @interface QueryMap {
    /**
     * Specifies whether parameter names and values are already encoded.
     *
     * @see Param#encoded
     */
    boolean encoded() default false;
}