//
   //  ========================================================================
   //  Copyright (c) 1995-2013 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.api.extensions;
  
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  
  import org.eclipse.jetty.websocket.api.util.QuoteUtil;
  
  /**
   * Represents an Extension Configuration, as seen during the connection Handshake process.
   */
  public class ExtensionConfig
  {
      public static ExtensionConfig parse(String parameterizedName)
      {
          Iterator<String> extListIter = QuoteUtil.splitAt(parameterizedName,";");
          String extToken = extListIter.next();
  
          ExtensionConfig ext = new ExtensionConfig(extToken);
  
          // now for parameters
          while (extListIter.hasNext())
          {
              String extParam = extListIter.next();
              Iterator<String> extParamIter = QuoteUtil.splitAt(extParam,"=");
              String key = extParamIter.next().trim();
              String value = null;
              if (extParamIter.hasNext())
              {
                  value = extParamIter.next();
              }
              ext.setParameter(key,value);
          }
  
          return ext;
      }
  
      private final String name;
      private Map<String, String> parameters;
  
      public ExtensionConfig(String name)
      {
          this.name = name;
          this.parameters = new HashMap<>();
      }
  
      public String getName()
      {
          return name;
      }
  
      public int getParameter(String key, int defValue)
      {
          String val = parameters.get(key);
          if (val == null)
          {
              return defValue;
          }
          return Integer.valueOf(val);
      }
  
      public String getParameter(String key, String defValue)
      {
          String val = parameters.get(key);
          if (val == null)
          {
              return defValue;
          }
          return val;
      }
  
      public String getParameterizedName()
      {
          StringBuilder str = new StringBuilder();
          str.append(name);
          for (String param : parameters.keySet())
          {
              str.append(';');
              str.append(param);
              String value = parameters.get(param);
             if (value != null)
             {
                 str.append('=');
                 QuoteUtil.quoteIfNeeded(str,value,";=");
             }
         }
         return str.toString();
     }
 
     public Set<String> getParameterKeys()
     {
         return parameters.keySet();
     }
 
     /**
      * Return parameters found in request URI.
      * 
      * @return the parameter map
      */
     public Map<String, String> getParameters()
     {
         return parameters;
     }
 
     /**
      * Initialize the parameters on this config from the other configuration.
      * 
      * @param other
      *            the other configuration.
      */
     public void init(ExtensionConfig other)
     {
         this.parameters.clear();
         this.parameters.putAll(other.parameters);
     }
 
     public void setParameter(String key, int value)
     {
         parameters.put(key,Integer.toString(value));
     }
 
     public void setParameter(String key, String value)
     {
         parameters.put(key,value);
     }
 
     @Override
     public String toString()
     {
         return getParameterizedName();
     }
 }