/*
 * Copyright © 2016-2017 European Support Limited
 *
 * 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.openecomp.core.factory.api;

import org.apache.commons.lang3.StringUtils;
import org.openecomp.core.factory.FactoryConfig;
import org.openecomp.core.factory.impl.AbstractFactoryBase;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;

import java.util.Map;

public abstract class AbstractComponentFactory<I> extends AbstractFactory<I> {

  static {
    Registry registry = new RegistryImpl();
    InitializationHelper.registerFactoryMapping(registry);
  }

  @FunctionalInterface
  interface Registry {
    void register(String factory, String impl);
  }

  private static class RegistryImpl implements Registry {
    @Override
    public void register(String factory, String impl) {
      AbstractFactoryBase.registerFactory(factory, impl);
    }
  }

  static class InitializationHelper {


    private static boolean isRegistered = false;

    private InitializationHelper() {
    }

    static synchronized void registerFactoryMapping(Registry registry) {
      if (!isRegistered) {
        registerFactoryMappingImpl(registry);
        isRegistered = true;
      }
    }

    private static void registerFactoryMappingImpl(Registry registry) {
      Map<String, String> factoryMap = FactoryConfig.getFactoriesMap();

        for (Map.Entry<String, String> entry : factoryMap.entrySet()) {
          String abstractClassName = entry.getKey();
          String concreteTypeName = entry.getValue();

          if (StringUtils.isEmpty(concreteTypeName)) {
            throw new CoreException(
                new ErrorCode.ErrorCodeBuilder().withId("E0003")
                    .withMessage("Missing configuration value:" + concreteTypeName + ".")
                    .withCategory(ErrorCategory.SYSTEM).build());

          }
          registry.register(abstractClassName, concreteTypeName);
        }
    }
  }

}