001    package org.apache.myfaces.tobago.example.demo.bestpractice;
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.commons.io.IOUtils;
021    import org.apache.commons.logging.Log;
022    import org.apache.commons.logging.LogFactory;
023    
024    import javax.faces.context.FacesContext;
025    import javax.servlet.http.HttpServletResponse;
026    import java.io.IOException;
027    import java.io.InputStream;
028    import java.util.Arrays;
029    import java.util.List;
030    
031    
032    public class BestPracticeController {
033    
034      private static final Log LOG = LogFactory.getLog(BestPracticeController.class);
035    
036      private List<Bird> birds = Arrays.asList(
037          new Bird("Amsel", 25),
038          new Bird("Drossel", 25),
039          new Bird("Fink", 9),
040          new Bird("Star", 19)
041      );
042    
043      private String status;
044    
045      public String throwException() {
046        throw new RuntimeException("This exception is forced by the user.");
047      }
048    
049      public String viewPdfInBrowser() {
050        return viewPdf(false);
051      }
052    
053      public String viewPdfOutsideOfBrowser() {
054        return viewPdf(true);
055      }
056    
057      private String viewPdf(boolean outside) {
058    
059        FacesContext facesContext = FacesContext.getCurrentInstance();
060    
061        InputStream inputStream = null;
062        try {
063          inputStream = facesContext.getExternalContext().getResourceAsStream("best-practice/sample.pdf");
064          if (inputStream == null) {
065            inputStream = facesContext.getExternalContext().getResourceAsStream("/best-practice/sample.pdf");
066          }
067          HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
068          response.setContentType("application/pdf");
069          if (outside) {
070            response.setHeader("Content-Disposition", "attachment; filename=sample.pdf");
071          }
072          IOUtils.copy(inputStream, response.getOutputStream());
073        } catch (IOException e) {
074          LOG.warn("Cannot deliver pdf", e);
075          return "error"; // response via faces
076        } finally {
077          IOUtils.closeQuietly(inputStream);
078        }
079        facesContext.responseComplete();
080        return null;
081      }
082    
083      public List<Bird> getBirds() {
084        return birds;
085      }
086    
087      public String getStatus() {
088        return status;
089      }
090    
091      public void setStatus(String status) {
092        this.status = status;
093      }
094    }