//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.websocket.jsr356;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import javax.websocket.Extension;
  
  import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
  import org.eclipse.jetty.websocket.api.util.QuoteUtil;
  
  public class JsrExtension implements Extension
  {
      private static class JsrParameter implements Extension.Parameter
      {
          private String name;
          private String value;
  
          private JsrParameter(String key, String value)
          {
              this.name = key;
              this.value = value;
          }
  
          @Override
          public String getName()
          {
              return this.name;
          }
  
          @Override
          public String getValue()
          {
              return this.value;
          }
      }
  
      private final String name;
      private List<Parameter> parameters = new ArrayList<>();
  
      /**
       * A configured extension
       * @param cfg the configuration for the extension 
       */
      public JsrExtension(ExtensionConfig cfg)
      {
          this.name = cfg.getName();
          if (cfg.getParameters() != null)
          {
              for (Map.Entry<String, String> entry : cfg.getParameters().entrySet())
              {
                  parameters.add(new JsrParameter(entry.getKey(),entry.getValue()));
              }
          }
      }
  
      /**
       * A potential (unconfigured) extension
       * @param name the name of the extension
       */
      public JsrExtension(String name)
      {
          this.name = name;
      }
  
      @Override
      public String getName()
      {
          return name;
      }
  
      @Override
      public List<Parameter> getParameters()
      {
          return parameters;
      }
  
      @Override
      public String toString()
      {
          StringBuilder str = new StringBuilder();
         str.append(name);
         for (Parameter param : parameters)
         {
             str.append(';');
             str.append(param.getName());
             String value = param.getValue();
             if (value != null)
             {
                 str.append('=');
                 QuoteUtil.quoteIfNeeded(str,value,";=");
             }
         }
         return str.toString();
     }
 }