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80 lines (68 loc) · 2.22 KB
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/*
* 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 static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* A named template parameter applied to {@link Headers}, {@linkplain RequestLine} or {@linkplain
* Body}
*/
@Retention(RUNTIME)
@java.lang.annotation.Target(PARAMETER)
public @interface Param {
/**
* The name of the template parameter.
*/
String value();
/**
* How to expand the value of this parameter, if {@link ToStringExpander} isn't adequate.
*/
Class<? extends Expander> expander() default ToStringExpander.class;
interface Expander {
/**
* Expands the value into a string. Does not accept or return null.
*/
String expand(Object value);
interface Factory {
/**
* Called to create an instance of {@link feign.Param.Expander}.
* @param expanderType requested expander type
* @return E
*/
<E extends Expander> E getInstance(Class<E> expanderType);
}
}
final class ToStringExpander implements Expander {
@Override
public String expand(Object value) {
return value.toString();
}
}
final class DefaultExpanderFactory implements Expander.Factory {
public static final DefaultExpanderFactory INSTANCE = new DefaultExpanderFactory();
@Override
public <E extends Expander> E getInstance(Class<E> expanderType) {
try {
return expanderType.newInstance();
} catch (InstantiationException e) {
throw new IllegalStateException(e);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
}
}