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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.metadata.definition;
import org.apache.dubbo.common.utils.JsonUtils;
import org.apache.dubbo.metadata.definition.model.FullServiceDefinition;
import org.apache.dubbo.metadata.definition.model.MethodDefinition;
import org.apache.dubbo.metadata.definition.model.ServiceDefinition;
import org.apache.dubbo.metadata.definition.model.TypeDefinition;
import org.apache.dubbo.metadata.definition.util.ClassUtils;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* 2015/1/27.
*/
public final class ServiceDefinitionBuilder {
/**
* Describe a Java interface in {@link ServiceDefinition}.
*
* @return Service description
*/
public static ServiceDefinition build(final Class interfaceClass) {
ServiceDefinition sd = new ServiceDefinition();
build(sd, interfaceClass);
return sd;
}
public static FullServiceDefinition buildFullDefinition(final Class interfaceClass) {
FullServiceDefinition sd = new FullServiceDefinition();
build(sd, interfaceClass);
return sd;
}
public static FullServiceDefinition buildFullDefinition(final Class interfaceClass, Map params) {
FullServiceDefinition sd = new FullServiceDefinition();
build(sd, interfaceClass);
sd.setParameters(params);
return sd;
}
public static void build(T sd, final Class interfaceClass) {
sd.setCanonicalName(interfaceClass.getCanonicalName());
sd.setCodeSource(ClassUtils.getCodeSource(interfaceClass));
Annotation[] classAnnotations = interfaceClass.getAnnotations();
sd.setAnnotations(annotationToStringList(classAnnotations));
TypeDefinitionBuilder builder = new TypeDefinitionBuilder();
List methods = ClassUtils.getPublicNonStaticMethods(interfaceClass);
for (Method method : methods) {
MethodDefinition md = new MethodDefinition();
md.setName(method.getName());
Annotation[] methodAnnotations = method.getAnnotations();
md.setAnnotations(annotationToStringList(methodAnnotations));
// Process parameter types.
Class[] paramTypes = method.getParameterTypes();
Type[] genericParamTypes = method.getGenericParameterTypes();
String[] parameterTypes = new String[paramTypes.length];
for (int i = 0; i < paramTypes.length; i++) {
TypeDefinition td = builder.build(genericParamTypes[i], paramTypes[i]);
parameterTypes[i] = td.getType();
}
md.setParameterTypes(parameterTypes);
// Process return type.
TypeDefinition td = builder.build(method.getGenericReturnType(), method.getReturnType());
md.setReturnType(td.getType());
sd.getMethods().add(md);
}
sd.setTypes(builder.getTypeDefinitions());
}
private static List annotationToStringList(Annotation[] annotations) {
if (annotations == null) {
return Collections.emptyList();
}
List list = new ArrayList<>();
for (Annotation annotation : annotations) {
list.add(annotation.toString());
}
return list;
}
/**
* Describe a Java interface in Json schema.
*
* @return Service description
*/
public static String schema(final Class clazz) {
ServiceDefinition sd = build(clazz);
return JsonUtils.getJson().toJson(sd);
}
private ServiceDefinitionBuilder() {
}
}