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   *  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
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.project;
  
  import org.apache.cayenne.di.Binder;
  import org.apache.cayenne.di.ListBuilder;
  import org.apache.cayenne.project.extension.ProjectExtension;
  import org.apache.cayenne.project.upgrade.handlers.UpgradeHandler;
  
  /**
   * @since 5.0
   */
  public class ProjectModuleExtender {
  
      private final Binder binder;
  
      private ListBuilder<UpgradeHandler> upgradeHandlers;
      private ListBuilder<ProjectExtension> extensions;
  
      public ProjectModuleExtender(Binder binder) {
          this.binder = binder;
      }
  
      protected ProjectModuleExtender initAllExtensions() {
          contributeExtensions();
          contributeUpgradeHandler();
          return this;
      }
  
      public ProjectModuleExtender addUpgradeHandler(UpgradeHandler handler) {
          contributeUpgradeHandler().add(handler);
          return this;
      }
  
      public ProjectModuleExtender addUpgradeHandler(Class<? extends UpgradeHandler> handler) {
          contributeUpgradeHandler().add(handler);
          return this;
      }
  
      public ProjectModuleExtender addExtension(ProjectExtension extension) {
          contributeExtensions().add(extension);
          return this;
      }
  
      public ProjectModuleExtender addExtension(Class<? extends ProjectExtension> extension) {
          contributeExtensions().add(extension);
          return this;
      }
  
      private ListBuilder<ProjectExtension> contributeExtensions() {
          if (extensions == null) {
              extensions = binder.bindList(ProjectExtension.class);
          }
          return extensions;
      }
  
      private ListBuilder<UpgradeHandler> contributeUpgradeHandler() {
          if (upgradeHandlers == null) {
              upgradeHandlers = binder.bindList(UpgradeHandler.class);
          }
          return upgradeHandlers;
      }
  }
  