/*
* Copyright 2013 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.jaxrs;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import feign.Contract;
import feign.MethodMetadata;
import static feign.Util.checkState;
import static feign.Util.emptyToNull;
/**
* Please refer to the <a href="https://github.com/Netflix/feign/tree/master/feign-jaxrs">Feign
* JAX-RS README</a>.
*/
public final class JAXRSContract extends Contract.BaseContract {
static final String ACCEPT = "Accept";
static final String CONTENT_TYPE = "Content-Type";
// Protected so unittest can call us
// XXX: Should parseAndValidateMetadata(Class, Method) be public instead? The old deprecated parseAndValidateMetadata(Method) was public..
@Override
protected MethodMetadata parseAndValidateMetadata(Class<?> targetType, Method method) {
return super.parseAndValidateMetadata(targetType, method);
}
@Override
protected void processAnnotationOnClass(MethodMetadata data, Class<?> clz) {
Path path = clz.getAnnotation(Path.class);
if (path != null) {
String pathValue = emptyToNull(path.value());
checkState(pathValue != null, "Path.value() was empty on type %s", clz.getName());
if (!pathValue.startsWith("/")) {
pathValue = "/" + pathValue;
}
if (pathValue.endsWith("/")) {
// Strip off any trailing slashes, since the template has already had slashes appropriately added
pathValue = pathValue.substring(0, pathValue.length() - 1);
}
data.template().insert(0, pathValue);
}
Consumes consumes = clz.getAnnotation(Consumes.class);
if (consumes != null) {
handleConsumesAnnotation(data, consumes, clz.getName());
}
Produces produces = clz.getAnnotation(Produces.class);
if (produces != null) {
handleProducesAnnotation(data, produces, clz.getName());
}
}
@Override
protected void processAnnotationOnMethod(MethodMetadata data, Annotation methodAnnotation,
Method method) {
Class<? extends Annotation> annotationType = methodAnnotation.annotationType();
HttpMethod http = annotationType.getAnnotation(HttpMethod.class);
if (http != null) {
checkState(data.template().method() == null,
"Method %s contains multiple HTTP methods. Found: %s and %s", method.getName(),
data.template().method(), http.value());
data.template().method(http.value());
} else if (annotationType == Path.class) {
String pathValue = emptyToNull(Path.class.cast(methodAnnotation).value());
checkState(pathValue != null, "Path.value() was empty on method %s", method.getName());
String methodAnnotationValue = Path.class.cast(methodAnnotation).value();
if (!methodAnnotationValue.startsWith("/") && !data.template().url().endsWith("/")) {
methodAnnotationValue = "/" + methodAnnotationValue;
}
// jax-rs allows whitespace around the param name, as well as an optional regex. The contract should
// strip these out appropriately.
methodAnnotationValue = methodAnnotationValue.replaceAll("\\{\\s*(.+?)\\s*(:.+?)?\\}", "\\{$1\\}");
data.template().append(methodAnnotationValue);
} else if (annotationType == Produces.class) {
handleProducesAnnotation(data, (Produces) methodAnnotation, "method " + method.getName());
} else if (annotationType == Consumes.class) {
handleConsumesAnnotation(data, (Consumes) methodAnnotation, "method " + method.getName());
}
}
private void handleProducesAnnotation(MethodMetadata data, Produces produces, String name) {
String[] serverProduces = produces.value();
String clientAccepts = serverProduces.length == 0 ? null : emptyToNull(serverProduces[0]);
checkState(clientAccepts != null, "Produces.value() was empty on %s", name);
data.template().header(ACCEPT, (String) null); // remove any previous produces
data.template().header(ACCEPT, clientAccepts);
}
private void handleConsumesAnnotation(MethodMetadata data, Consumes consumes, String name) {
String[] serverConsumes = consumes.value();
String clientProduces = serverConsumes.length == 0 ? null : emptyToNull(serverConsumes[0]);
checkState(clientProduces != null, "Consumes.value() was empty on %s", name);
data.template().header(CONTENT_TYPE, (String) null); // remove any previous consumes
data.template().header(CONTENT_TYPE, clientProduces);
}
@Override
protected boolean processAnnotationsOnParameter(MethodMetadata data, Annotation[] annotations,
int paramIndex) {
boolean isHttpParam = false;
for (Annotation parameterAnnotation : annotations) {
Class<? extends Annotation> annotationType = parameterAnnotation.annotationType();
if (annotationType == PathParam.class) {
String name = PathParam.class.cast(parameterAnnotation).value();
checkState(emptyToNull(name) != null, "PathParam.value() was empty on parameter %s",
paramIndex);
nameParam(data, name, paramIndex);
isHttpParam = true;
} else if (annotationType == QueryParam.class) {
String name = QueryParam.class.cast(parameterAnnotation).value();
checkState(emptyToNull(name) != null, "QueryParam.value() was empty on parameter %s",
paramIndex);
Collection<String> query = addTemplatedParam(data.template().queries().get(name), name);
data.template().query(name, query);
nameParam(data, name, paramIndex);
isHttpParam = true;
} else if (annotationType == HeaderParam.class) {
String name = HeaderParam.class.cast(parameterAnnotation).value();
checkState(emptyToNull(name) != null, "HeaderParam.value() was empty on parameter %s",
paramIndex);
Collection<String> header = addTemplatedParam(data.template().headers().get(name), name);
data.template().header(name, header);
nameParam(data, name, paramIndex);
isHttpParam = true;
} else if (annotationType == FormParam.class) {
String name = FormParam.class.cast(parameterAnnotation).value();
checkState(emptyToNull(name) != null, "FormParam.value() was empty on parameter %s",
paramIndex);
data.formParams().add(name);
nameParam(data, name, paramIndex);
isHttpParam = true;
}
}
return isHttpParam;
}
// Not using override as the super-type's method is deprecated and will be removed.
protected Collection<String> addTemplatedParam(Collection<String> possiblyNull, String name) {
if (possiblyNull == null) {
possiblyNull = new ArrayList<String>();
}
possiblyNull.add(String.format("{%s}", name));
return possiblyNull;
}
}