package com.atlassian.plugin.servlet.descriptors;
   
   import com.atlassian.plugin.Permissions;
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.PluginParseException;
   import com.atlassian.plugin.RequirePermission;
   import com.atlassian.plugin.descriptors.AbstractModuleDescriptor;
   import com.atlassian.plugin.module.ModuleFactory;
   import com.atlassian.plugin.util.validation.ValidationPattern;
  import org.dom4j.Element;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import static com.atlassian.plugin.util.validation.ValidationPattern.test;
  
  /**
   * Acts as a base for other servlet type module descriptors to inherit.  It adds parsing and retrieval of any paths
   * declared in the descriptor with <url-pattern> as well as <init-param>s. 
   * 
   * @since 2.1.0
   */
  @RequirePermission(Permissions.EXECUTE_JAVA)
  public abstract class BaseServletModuleDescriptor<T> extends AbstractModuleDescriptor<T>
  {
      protected static final Logger log = LoggerFactory.getLogger(BaseServletModuleDescriptor.class);
  
      private List<String> paths;
      private Map<String,String> initParams;
  
      /**
       * @since 2.5.0
       * @param moduleCreator
       */
      public BaseServletModuleDescriptor(ModuleFactory moduleCreator)
      {
          super(moduleCreator);
      }
  
      public void init(Plugin plugin, Element element) throws PluginParseException
      {
          super.init(plugin, element);
  
          checkPermissions(); // do that early
  
          List<Element> urlPatterns = element.elements("url-pattern");
          paths = new ArrayList<String>(urlPatterns.size());
  
          for (Element urlPattern : urlPatterns)
          {
              paths.add(urlPattern.getTextTrim());
          }
  
          initParams = new HashMap<String,String>();
          List<Element> paramsList = element.elements("init-param");
          for (Element initParamEl : paramsList)
          {
              Element paramNameEl = initParamEl.element("param-name");
              Element paramValueEl = initParamEl.element("param-value");
              initParams.put(paramNameEl.getTextTrim(), paramValueEl.getTextTrim());
          }
      }
  
      @Override
      protected void provideValidationRules(ValidationPattern pattern)
      {
          super.provideValidationRules(pattern);
          pattern.
                  rule(
                      test("@class").withError("The class is required"),
                      test("url-pattern").withError("There must be at least one path specified")).
                  rule("init-param",
                      test("param-name").withError("Parameter name is required"),
                      test("param-value").withError("Parameter value is required"));
      }
  
      public List<String> getPaths()
      {
          return paths;
      }
  
      public Map<String,String> getInitParams()
      {
          return initParams;
      }
  
  }