/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * 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
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package javax.faces.context;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.Writer;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  import javax.faces.lifecycle.ClientWindow;
  
  /**
   * see Javadoc of <a href="http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.html">JSF Specification</a>
   */
  public abstract class ExternalContext
  {
      public static final String BASIC_AUTH = "BASIC";
      public static final String CLIENT_CERT_AUTH = "CLIENT_CERT";
      public static final String DIGEST_AUTH = "DIGEST";
      public static final String FORM_AUTH = "FORM";
      
      /**
       *
       * @param name
       * @param value
       * @param properties
       *
       * @since 2.0
       */
      public void addResponseCookie(String name, String value, Map<String, Object> properties)
      {
          ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
          
          if (ctx == null)
          {
              throw new UnsupportedOperationException();
          }
          
          ctx.addResponseCookie(name, value, properties);
      }
  
      /**
       *
       * @param name
       * @param value
       *
       * @since 2.0
       */
      public void addResponseHeader(String name, String value)
      {
          ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
          
          if (ctx == null)
          {
              throw new UnsupportedOperationException();
          }
          
          ctx.addResponseHeader(name, value);
      }
  
      public abstract void dispatch(String path) throws IOException;
  
      public abstract String encodeActionURL(String url);
  
      /**
       *
       * @param baseUrl
       * @param parameters
       *
       * @since 2.0
       */
      public String encodeBookmarkableURL(String baseUrl, Map<String,List<String>> parameters)
      {
          ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
          
          if (ctx == null)
          {
              throw new UnsupportedOperationException();
          }
          
         return ctx.encodeBookmarkableURL(baseUrl, parameters);
     }
 
     public abstract String encodeNamespace(String name);
 
 
     /**
      * @since 2.0
      */
     public String encodePartialActionURL(String url)
     {
         // TODO: IMPLEMENT IMPL
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.encodePartialActionURL(url);
     }
 
     /**
      *
      * @param baseUrl
      * @param parameters
      *
      * @since 2.0
      */
     public String encodeRedirectURL(String baseUrl, Map<String,List<String>> parameters)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.encodeRedirectURL(baseUrl, parameters);
     }
 
     public abstract String encodeResourceURL(String url);
 
     public abstract Map<String, Object> getApplicationMap();
 
     public abstract String getAuthType();
 
     public abstract Object getContext();
 
     /**
      * Returns the name of the underlying context
      *
      * @return the name or null
      *
      * @since 2.0
      */
     public String getContextName()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getContextName();
     }
 
     /**
      * @since 2.0
      */
     public Flash getFlash()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getFlash();
     }
 
     public abstract String getInitParameter(String name);
 
     public abstract Map<String,String> getInitParameterMap();
 
     /**
      * @since JSF 2.0
      */
     public String getMimeType(String file)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getMimeType(file);
     }
 
     /**
      * @since JSF 2.0
      */
     public String getRealPath(String path)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRealPath(path);
     }
 
     public abstract String getRemoteUser();
 
     public abstract Object getRequest();
 
     public String getRequestCharacterEncoding()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestCharacterEncoding();
     }
 
     /**
      *
      * @return
      *
      * @since 2.0
      */
     public int getRequestContentLength()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestContentLength();
     }
 
     public String getRequestContentType()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestContentType();
     }
 
     public abstract String getRequestContextPath();
 
     public abstract Map<String, Object> getRequestCookieMap();
 
     public abstract Map<String, String> getRequestHeaderMap();
 
     public abstract Map<String, String[]> getRequestHeaderValuesMap();
 
     public abstract Locale getRequestLocale();
 
     public abstract Iterator<Locale> getRequestLocales();
 
     public abstract Map<String, Object> getRequestMap();
 
     public abstract Map<String, String> getRequestParameterMap();
 
     public abstract Iterator<String> getRequestParameterNames();
 
     public abstract Map<String, String[]> getRequestParameterValuesMap();
 
     public abstract String getRequestPathInfo();
 
     /**
      * @since JSF 2.0
      */
     public String getRequestScheme()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestScheme();
     }
 
     /**
      * @since JSF 2.0
      */
     public String getRequestServerName()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestServerName();
     }
 
     /**
      * @since JSF 2.0
      */
     public int getRequestServerPort()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getRequestServerPort();
     }
 
     public abstract String getRequestServletPath();
 
     public abstract java.net.URL getResource(String path) throws java.net.MalformedURLException;
 
     public abstract java.io.InputStream getResourceAsStream(String path);
 
     public abstract Set<String> getResourcePaths(String path);
 
     public abstract Object getResponse();
 
     /**
      *
      * @return
      *
      * @since 2.0
      */
     public int getResponseBufferSize()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getResponseBufferSize();
     }
 
     public String getResponseCharacterEncoding()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException("JSF 1.2 : figure out how to tell if this is a Portlet request");
         }
         
         return ctx.getResponseCharacterEncoding();
     }
 
     /**
      * throws <code>UnsupportedOperationException</code> by default.
      *
      * @since JSF 1.2
      */
     public String getResponseContentType()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getResponseContentType();
     }
 
     /**
      * @since JSF 2.0
      */
     public OutputStream getResponseOutputStream() throws IOException
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getResponseOutputStream();
     }
 
     /**
      * @since JSF 2.0
      */
     public Writer getResponseOutputWriter() throws IOException
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getResponseOutputWriter();
     }
 
     public abstract Object getSession(boolean create);
 
     public abstract Map<String, Object> getSessionMap();
 
     public abstract java.security.Principal getUserPrincipal();
 
     /**
      * @since 2.0
      */
     public void invalidateSession()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.invalidateSession();
     }
 
     /**
      * @since 2.0
      */
     public boolean isResponseCommitted()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.isResponseCommitted();
     }
 
     public abstract boolean isUserInRole(String role);
 
     /**
      * @since 2.0
      */
     public abstract void log(String message);
 
     /**
      * @since 2.0
      */
     public abstract void log(String message, Throwable exception);
 
     public abstract void redirect(String url) throws java.io.IOException;
 
     /**
      *
      * @throws IOException
      *
      * @since 2.0
      */
     public void responseFlushBuffer() throws IOException
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.responseFlushBuffer();
     }
 
     /**
      *
      * @since 2.0
      */
     public void responseReset()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.responseReset();
     }
 
     /**
      *
      * @param statusCode
      * @param message
      * @throws IOException
      *
      * @since 2.0
      */
     public void responseSendError(int statusCode, String message) throws IOException
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.responseSendError(statusCode, message);
     }
 
     /**
      * throws <code>UnsupportedOperationException</code> by default.
      *
      * @since JSF 1.2
      * @param request
      */
     public void setRequest(Object request)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setRequest(request);
     }
 
     /**
      * throws <code>UnsupportedOperationException</code> by default.
      *
      * @since JSF 1.2
      * @param encoding
      * @throws java.io.UnsupportedEncodingException
      */
     public void setRequestCharacterEncoding(java.lang.String encoding)
             throws java.io.UnsupportedEncodingException
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setRequestCharacterEncoding(encoding);
     }
 
     /**
      * throws <code>UnsupportedOperationException</code> by default.
      *
      * @since JSF 1.2
      * @param response
      */
     public void setResponse(Object response)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponse(response);
     }
 
     /**
      *
      * @param size
      *
      * @since 2.0
      */
     public void setResponseBufferSize(int size)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseBufferSize(size);
     }
 
     /**
      * throws <code>UnsupportedOperationException</code> by default.
      *
      * @since JSF 1.2
      * @param encoding
      */
     public void setResponseCharacterEncoding(String encoding)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseCharacterEncoding(encoding);
     }
 
     /**
      *
      * @param length
      *
      * @since 2.0
      */
     public void setResponseContentLength(int length)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseContentLength(length);
     }
 
     /**
      *
      * @param contentType
      *
      * @since 2.0
      */
     public void setResponseContentType(String contentType)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseContentType(contentType);
     }
 
     /**
      *
      * @param name
      * @param value
      *
      * @since 2.0
      */
     public void setResponseHeader(String name, String value)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseHeader(name, value);
     }
 
     /**
      *
      * @param statusCode
      *
      * @since 2.0
      */
     public void setResponseStatus(int statusCode)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setResponseStatus(statusCode);
     }
     
     /**
      * 
      * @since 2.1
      * @return
      */
     public boolean isSecure()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
 
         return ctx.isSecure();
     }
     
     /**
      * 
      * @since 2.1
      * @return
      */
     public int getSessionMaxInactiveInterval()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
 
         return ctx.getSessionMaxInactiveInterval();
     }
     
     /**
      * 
      * @since 2.1
      * @param interval
      */
     public void setSessionMaxInactiveInterval(int interval)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setSessionMaxInactiveInterval(interval);
     }
 
     /**
      * @since 2.2
      * @return 
      */
     public ClientWindow getClientWindow()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             /*throw new UnsupportedOperationException();*/
             // TODO: Return null for now, but it should throw exception
             // in JSF 2.2
             return null;
         }
         
         return ctx.getClientWindow();
     }
     
     /**
      * @since 2.2
      * @param window 
      */
     public void setClientWindow(ClientWindow window)
     {
         // No op for now.
         /*
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         ctx.setClientWindow(window);
         */
     }
     
     /**
      * @since 2.2
      * @param create
      * @return 
      */
     public String getSessionId(boolean create)
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getSessionId(create);
     }
     
     /**
      * @since 2.2
      * @return
      */
     public String getApplicationContextPath()
     {
         ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
         
         if (ctx == null)
         {
             throw new UnsupportedOperationException();
         }
         
         return ctx.getApplicationContextPath();
     }
     
     /**
      * @since 2.3
      * @param url
      * @return 
      */
     public abstract String encodeWebsocketURL(String url);
 
 }