package com.atlassian.plugin.servlet.util;
   
   import javax.servlet.ServletOutputStream;
   import javax.servlet.WriteListener;
   import javax.servlet.http.Cookie;
   import javax.servlet.http.HttpServletResponse;
   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   import java.io.PrintWriter;
  import java.util.Collection;
  import java.util.Locale;
  
  /**
   * A {@link javax.servlet.http.HttpServletResponse} that captures its output (in platform specific charset!)
   *
   * @since v4.0
   */
  public class CapturingHttpServletResponse implements HttpServletResponse {
      private final ByteArrayOutputStream baos;
      private final ServletOutputStream servletOutputStream;
      private PrintWriter printWriter;
  
      public CapturingHttpServletResponse() {
          this.baos = new ByteArrayOutputStream();
          servletOutputStream = new ServletOutputStream() {
  
              @Override
              public boolean isReady() {
                  return true;
              }
  
              @Override
              public void setWriteListener(WriteListener writeListener) {
                  throw new UnsupportedOperationException();
              }
  
              @Override
              public void write(final int b) throws IOException {
                  baos.write(b);
              }
          };
  
          printWriter = new PrintWriter(servletOutputStream);
      }
  
      @Override
      public ServletOutputStream getOutputStream() throws IOException {
          return servletOutputStream;
      }
  
      @Override
      public PrintWriter getWriter() throws IOException {
          return printWriter;
      }
  
      @Override
      public String toString() {
          return baos.toString();
      }
  
      //===================================================
      @Override
      public void addCookie(final Cookie cookie) {
      }
  
      @Override
      public boolean containsHeader(final String name) {
          return false;
      }
  
      @Override
      public String encodeURL(final String url) {
          return null;
      }
  
      @Override
      public String encodeRedirectURL(final String url) {
          return null;
      }
  
      @Override
      public String encodeUrl(final String url) {
          return null;
      }
  
      @Override
      public String encodeRedirectUrl(final String url) {
          return null;
      }
  
      @Override
      public void sendError(final int sc, final String msg) throws IOException {
      }
  
      @Override
      public void sendError(final int sc) throws IOException {
      }
  
      @Override
     public void sendRedirect(final String location) throws IOException {
     }
 
     @Override
     public void setDateHeader(final String name, final long date) {
     }
 
     @Override
     public void addDateHeader(final String name, final long date) {
     }
 
     @Override
     public void setHeader(final String name, final String value) {
     }
 
     @Override
     public void addHeader(final String name, final String value) {
     }
 
     @Override
     public void setIntHeader(final String name, final int value) {
     }
 
     @Override
     public void addIntHeader(final String name, final int value) {
     }
 
     @Override
     public void setStatus(final int sc) {
     }
 
     @Override
     public void setStatus(final int sc, final String sm) {
     }
 
     @Override
     public String getCharacterEncoding() {
         return null;
     }
 
     @Override
     public void setContentLength(final int len) {
     }
 
     @Override
     public void setContentType(final String type) {
     }
 
     @Override
     public void setBufferSize(final int size) {
     }
 
     @Override
     public int getBufferSize() {
         return 0;
     }
 
     @Override
     public void flushBuffer() throws IOException {
         printWriter.flush();
     }
 
     @Override
     public void resetBuffer() {
     }
 
     @Override
     public boolean isCommitted() {
         return false;
     }
 
     @Override
     public void reset() {
     }
 
     @Override
     public void setLocale(final Locale loc) {
     }
 
     @Override
     public Locale getLocale() {
         return null;
     }
 
     // Servlet 3.0 methods
 
     @Override
     public void setCharacterEncoding(String charset) {
     }
 
     @Override
     public int getStatus() {
         return 0;
     }
 
     @Override
     public String getHeader(String name) {
         return null;
     }
 
     @Override
     public Collection<String> getHeaders(String name) {
         return null;
     }
 
     @Override
     public Collection<String> getHeaderNames() {
         return null;
     }
 
     @Override
     public String getContentType() {
         return null;
     }
 
     // Servlet 3.1 methods
 
     @Override
     public void setContentLengthLong(long len) {
     }
 }