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256 lines (230 loc) · 9.89 KB
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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 feign.Util.checkState;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/** Defines what annotations and values are valid on interfaces. */
public interface Contract {
/**
* Called to parse the methods in the class that are linked to HTTP requests.
*
* @param targetType {@link feign.Target#type() type} of the Feign interface.
*/
List<MethodMetadata> parseAndValidateMetadata(Class<?> targetType);
abstract class BaseContract implements Contract {
/**
* @param targetType {@link feign.Target#type() type} of the Feign interface.
* @see #parseAndValidateMetadata(Class)
*/
@Override
public List<MethodMetadata> parseAndValidateMetadata(Class<?> targetType) {
checkState(
targetType.getTypeParameters().length == 0,
"Parameterized types unsupported: %s",
targetType.getSimpleName());
checkState(
targetType.getInterfaces().length <= 1,
"Only single inheritance supported: %s",
targetType.getSimpleName());
final Map<String, MethodMetadata> result = new LinkedHashMap<String, MethodMetadata>();
for (final Method method : targetType.getMethods()) {
if (method.getDeclaringClass() == Object.class
|| (method.getModifiers() & Modifier.STATIC) != 0
|| Util.isDefault(method)
|| method.isAnnotationPresent(FeignIgnore.class)
|| method.isSynthetic()
|| method.isBridge()) {
continue;
}
final MethodMetadata metadata = parseAndValidateMetadata(targetType, method);
if (result.containsKey(metadata.configKey())) {
MethodMetadata existingMetadata = result.get(metadata.configKey());
Type existingReturnType = existingMetadata.returnType();
Type overridingReturnType = metadata.returnType();
Type resolvedType = Types.resolveReturnType(existingReturnType, overridingReturnType);
if (resolvedType.equals(overridingReturnType)) {
result.put(metadata.configKey(), metadata);
}
continue;
}
result.put(metadata.configKey(), metadata);
}
return new ArrayList<>(result.values());
}
/**
* @deprecated use {@link #parseAndValidateMetadata(Class, Method)} instead.
*/
@Deprecated
public MethodMetadata parseAndValidateMetadata(Method method) {
return parseAndValidateMetadata(method.getDeclaringClass(), method);
}
/** Called indirectly by {@link #parseAndValidateMetadata(Class)}. */
protected MethodMetadata parseAndValidateMetadata(Class<?> targetType, Method method) {
final MethodMetadata data = new MethodMetadata();
data.targetType(targetType);
data.method(method);
data.returnType(Types.resolve(targetType, targetType, method.getGenericReturnType()));
data.configKey(Feign.configKey(targetType, method));
if (AlwaysEncodeBodyContract.class.isAssignableFrom(this.getClass())) {
data.alwaysEncodeBody(true);
}
if (targetType.getInterfaces().length == 1) {
processAnnotationOnClass(data, targetType.getInterfaces()[0]);
}
processAnnotationOnClass(data, targetType);
for (final Annotation methodAnnotation : method.getAnnotations()) {
processAnnotationOnMethod(data, methodAnnotation, method);
}
if (data.isIgnored()) {
return data;
}
checkState(
data.template().method() != null,
"Method %s not annotated with HTTP method type (ex. GET, POST)%s",
data.configKey(),
data.warnings());
final Class<?>[] parameterTypes = method.getParameterTypes();
final Type[] genericParameterTypes = method.getGenericParameterTypes();
final Annotation[][] parameterAnnotations = method.getParameterAnnotations();
final int count = parameterAnnotations.length;
for (int i = 0; i < count; i++) {
boolean isHttpAnnotation = false;
if (parameterAnnotations[i] != null) {
isHttpAnnotation = processAnnotationsOnParameter(data, parameterAnnotations[i], i);
}
if (isHttpAnnotation) {
data.ignoreParamater(i);
}
if ("kotlin.coroutines.Continuation".equals(parameterTypes[i].getName())) {
data.ignoreParamater(i);
}
if (parameterTypes[i] == URI.class) {
data.urlIndex(i);
} else if (!isHttpAnnotation
&& !Request.Options.class.isAssignableFrom(parameterTypes[i])) {
if (data.isAlreadyProcessed(i)) {
checkState(
data.formParams().isEmpty() || data.bodyIndex() == null,
"Body parameters cannot be used with form parameters.%s",
data.warnings());
} else if (!data.alwaysEncodeBody()) {
checkState(
data.formParams().isEmpty(),
"Body parameters cannot be used with form parameters.%s",
data.warnings());
checkState(
data.bodyIndex() == null,
"Method has too many Body parameters: %s%s",
method,
data.warnings());
data.bodyIndex(i);
data.bodyType(Types.resolve(targetType, targetType, genericParameterTypes[i]));
}
}
}
if (data.headerMapIndex() != null) {
// check header map parameter for map type
if (Map.class.isAssignableFrom(parameterTypes[data.headerMapIndex()])) {
checkMapKeys("HeaderMap", genericParameterTypes[data.headerMapIndex()]);
}
}
if (data.queryMapIndex() != null) {
if (Map.class.isAssignableFrom(parameterTypes[data.queryMapIndex()])) {
checkMapKeys("QueryMap", genericParameterTypes[data.queryMapIndex()]);
}
}
return data;
}
private static void checkMapString(String name, Class<?> type, Type genericType) {
checkState(Map.class.isAssignableFrom(type), "%s parameter must be a Map: %s", name, type);
checkMapKeys(name, genericType);
}
private static void checkMapKeys(String name, Type genericType) {
Class<?> keyClass = null;
// assume our type parameterized
if (ParameterizedType.class.isAssignableFrom(genericType.getClass())) {
final Type[] parameterTypes = ((ParameterizedType) genericType).getActualTypeArguments();
keyClass = (Class<?>) parameterTypes[0];
} else if (genericType instanceof Class<?>) {
// raw class, type parameters cannot be inferred directly, but we can scan any extended
// interfaces looking for any explict types
final Type[] interfaces = ((Class<?>) genericType).getGenericInterfaces();
for (final Type extended : interfaces) {
if (ParameterizedType.class.isAssignableFrom(extended.getClass())) {
// use the first extended interface we find.
final Type[] parameterTypes = ((ParameterizedType) extended).getActualTypeArguments();
keyClass = (Class<?>) parameterTypes[0];
break;
}
}
}
if (keyClass != null) {
checkState(
String.class.equals(keyClass),
"%s key must be a String: %s",
name,
keyClass.getSimpleName());
}
}
/**
* Called by parseAndValidateMetadata twice, first on the declaring class, then on the target
* type (unless they are the same).
*
* @param data metadata collected so far relating to the current java method.
* @param clz the class to process
*/
protected abstract void processAnnotationOnClass(MethodMetadata data, Class<?> clz);
/**
* @param data metadata collected so far relating to the current java method.
* @param annotation annotations present on the current method annotation.
* @param method method currently being processed.
*/
protected abstract void processAnnotationOnMethod(
MethodMetadata data, Annotation annotation, Method method);
/**
* @param data metadata collected so far relating to the current java method.
* @param annotations annotations present on the current parameter annotation.
* @param paramIndex if you find a name in {@code annotations}, call {@link
* #nameParam(MethodMetadata, String, int)} with this as the last parameter.
* @return true if you called {@link #nameParam(MethodMetadata, String, int)} after finding an
* http-relevant annotation.
*/
protected abstract boolean processAnnotationsOnParameter(
MethodMetadata data, Annotation[] annotations, int paramIndex);
/** links a parameter name to its index in the method signature. */
protected void nameParam(MethodMetadata data, String name, int i) {
final Collection<String> names =
data.indexToName().containsKey(i) ? data.indexToName().get(i) : new ArrayList<String>();
names.add(name);
data.indexToName().put(i, names);
}
}
/**
* @deprecated use {@link DefaultContract} instead.
*/
@Deprecated
class Default extends DefaultContract {}
}
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