package com.atlassian.plugin.web.descriptors;
   
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.PluginParseException;
   import com.atlassian.plugin.descriptors.AbstractModuleDescriptor;
   import com.atlassian.plugin.module.ModuleFactory;
   import com.atlassian.plugin.util.validation.ValidationPattern;
   import com.atlassian.plugin.web.WebInterfaceManager;
   import com.atlassian.plugin.web.api.provider.WebSectionProvider;
  import com.google.common.base.Supplier;
  import org.dom4j.Element;
  
  import javax.annotation.Nonnull;
  
  import static com.atlassian.plugin.util.validation.ValidationPattern.test;
  import static com.google.common.base.Suppliers.memoize;
  
  public class WebSectionProviderModuleDescriptor extends AbstractModuleDescriptor<WebSectionProvider> {
      private final WebInterfaceManager webInterfaceManager;
      private Supplier<WebSectionProvider> sectionSupplier;
      private String location;
  
      public WebSectionProviderModuleDescriptor(final ModuleFactory moduleFactory, final WebInterfaceManager webInterfaceManager) {
          super(moduleFactory);
          this.webInterfaceManager = webInterfaceManager;
      }
  
      @Override
      protected void provideValidationRules(ValidationPattern pattern) {
          super.provideValidationRules(pattern);
          pattern.rule(test("@class").withError("The web section provider class is required"));
          pattern.rule(test("@location").withError("Must provide a location that sections should be added to."));
      }
  
      @Override
      public void init(@Nonnull final Plugin plugin, @Nonnull final Element element) throws PluginParseException {
          super.init(plugin, element);
          final WebSectionProviderModuleDescriptor that = this;
          sectionSupplier = memoize(new Supplier<WebSectionProvider>() {
              @Override
              public WebSectionProvider get() {
                  return moduleFactory.createModule(moduleClassName, that);
              }
          });
          location = element.attributeValue("location");
      }
  
      public String getLocation() {
          return location;
      }
  
      @Override
      public WebSectionProvider getModule() {
          return sectionSupplier.get();
      }
  
      @Override
      public void enabled() {
          super.enabled();
          webInterfaceManager.refresh();
      }
  
      @Override
      public void disabled() {
          super.disabled();
          webInterfaceManager.refresh();
      }
  }