oas-generator/oas-generator-core/src/main/java/org/apache/servicecomb/toolkit/generator/OasGenerator.java

/*
 * 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.servicecomb.toolkit.generator;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.ServiceLoader;
import java.util.Set;

import org.apache.servicecomb.toolkit.generator.parser.api.OpenApiAnnotationParser;

import io.swagger.v3.oas.models.OpenAPI;

public class OasGenerator {

  private static List<OpenApiAnnotationParser> parserList = new ArrayList<>();

  static {
    ServiceLoader.load(OpenApiAnnotationParser.class).forEach(parserList::add);
  }

  public OpenAPI generate(Class<?> cls) {

    Optional<OpenApiAnnotationParser> parserOptional = parserList.stream().filter(parser -> parser.canProcess(cls))
        .findFirst();

    if (!parserOptional.isPresent()) {
      return null;
    }
    OasContext context = new OasContext(parserOptional.get());
    parserOptional.get().parser(cls, context);
    return context.toOpenAPI();
  }

  public List<OpenAPI> generate(Set<Class> classes) {

    List<OpenAPI> openApiList = new ArrayList<>();
    for (Class cls : classes) {
      OpenAPI openAPI = generate(cls);
      if (openAPI != null) {
        openApiList.add(openAPI);
      }
    }

    return openApiList;
  }
}