/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * 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 org.activiti.spring;

import java.net.URL;
import java.util.Map;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ProcessEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import org.springframework.core.io.UrlResource;

/**

 */
public class SpringConfigurationHelper {

  private static Logger log = LoggerFactory.getLogger(SpringConfigurationHelper.class);

  public static ProcessEngine buildProcessEngine(URL resource) {
    log.debug("==== BUILDING SPRING APPLICATION CONTEXT AND PROCESS ENGINE =========================================");

    ApplicationContext applicationContext = new GenericXmlApplicationContext(new UrlResource(resource));
    Map<String, ProcessEngine> beansOfType = applicationContext.getBeansOfType(ProcessEngine.class);
    if ((beansOfType == null) || (beansOfType.isEmpty())) {
      throw new ActivitiException("no " + ProcessEngine.class.getName() + " defined in the application context " + resource.toString());
    }

    ProcessEngine processEngine = beansOfType.values().iterator().next();

    log.debug("==== SPRING PROCESS ENGINE CREATED ==================================================================");
    return processEngine;
  }

}
