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QueryMap.java
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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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 static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import feign.querymap.BeanQueryMapEncoder;
import feign.querymap.FieldQueryMapEncoder;
import java.lang.annotation.Retention;
import java.util.List;
import java.util.Map;
/**
* 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>
* ...
* @RequestLine("POST /servers")
* void servers(@QueryMap Map<String, String>);
* ...
*
* @RequestLine("GET /servers/{serverId}?count={count}")
* void get(@Param("serverId") String serverId, @Param("count") int count, @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.
*
* <p>Deprecation: there are two options
*
* <ul>
* <li>if name or value are already encoded we do nothing;
* <li>if name or value are not encoded we encode them.
* </ul>
*
* @see Param#encoded
* @deprecated
*/
boolean encoded() default false;
/**
* Specifies the QueryMapEncoder implementation to use to transform DTO into query map.
*
* @return the enum containing the instance of QueryMapEncoder
*/
MapEncoder mapEncoder() default MapEncoder.DEFAULT;
public enum MapEncoder {
// the latter DEFAULT will use BaseBuilder instance
BEAN(new BeanQueryMapEncoder()),
FIELD(new FieldQueryMapEncoder()),
DEFAULT(null);
private QueryMapEncoder mapEncoder;
private MapEncoder(QueryMapEncoder mapEncoder) {
this.mapEncoder = mapEncoder;
}
public QueryMapEncoder instance() {
return mapEncoder;
}
}
}