001    package org.apache.myfaces.tobago.util;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one or more
005     * contributor license agreements.  See the NOTICE file distributed with
006     * this work for additional information regarding copyright ownership.
007     * The ASF licenses this file to You under the Apache License, Version 2.0
008     * (the "License"); you may not use this file except in compliance with
009     * the License.  You may obtain a copy of the License at
010     *
011     *      http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing, software
014     * distributed under the License is distributed on an "AS IS" BASIS,
015     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016     * See the License for the specific language governing permissions and
017     * limitations under the License.
018     */
019    
020    import org.apache.myfaces.tobago.context.ClientProperties;
021    
022    import javax.faces.context.ExternalContext;
023    import javax.faces.context.FacesContext;
024    import javax.servlet.http.HttpServletResponse;
025    
026    /*
027     * Created by IntelliJ IDEA.
028     * User: bommel
029     * Date: Oct 21, 2006
030     * Time: 10:39:25 AM
031     */
032    public class ResponseUtils {
033    
034      public static void ensureNoCacheHeader(ExternalContext externalContext) {
035        // TODO PortletRequest
036        if (externalContext.getResponse() instanceof HttpServletResponse) {
037          HttpServletResponse response = (HttpServletResponse) externalContext.getResponse();
038          response.setHeader("Cache-Control", "no-cache,no-store,max-age=0,must-revalidate");
039          response.setHeader("Pragma", "no-cache");
040          response.setDateHeader("Expires", 0);
041          response.setDateHeader("max-age", 0);
042        }
043      }
044    
045      public static void ensureContentTypeHeader(FacesContext facesContext, String charset) {
046        // TODO PortletRequest
047        if (facesContext.getExternalContext().getResponse() instanceof HttpServletResponse) {
048          HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
049          response.setContentType(generateContentType(facesContext, charset));
050        }
051      }
052    
053      private static String generateContentType(FacesContext facesContext, String charset) {
054        StringBuilder sb = new StringBuilder("text/");
055        ClientProperties clientProperties
056            = ClientProperties.getInstance(facesContext.getViewRoot());
057        sb.append(clientProperties.getContentType());
058        if (charset == null) {
059          charset = "UTF-8";
060        }
061        sb.append("; charset=");
062        sb.append(charset);
063        return sb.toString();
064      }
065    }