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1 package nabble.view.lib;
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2
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3 import java.io.IOException;
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4
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5 import javax.servlet.Filter;
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6 import javax.servlet.FilterChain;
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7 import javax.servlet.FilterConfig;
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8 import javax.servlet.ServletException;
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9 import javax.servlet.ServletRequest;
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10 import javax.servlet.ServletResponse;
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11
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12 public class NabbleErrorFilter implements Filter {
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13 public static final String WORK_AROUND_ERROR_EXCEPTION = "work-around.error.exception";
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14
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15 public void destroy() { }
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16
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17 public void doFilter(ServletRequest req, ServletResponse res,
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18 FilterChain chain) throws IOException, ServletException {
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19
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20 try {
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21 chain.doFilter(req, res);
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22 } catch(Exception e) {
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23 req.setAttribute(WORK_AROUND_ERROR_EXCEPTION, e);
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24
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25 if(e instanceof RuntimeException) {
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26 RuntimeException th = (RuntimeException)e;
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27 throw th;
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28 }
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29 else if(e instanceof IOException) {
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30 IOException th = (IOException)e;
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31 throw th;
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32 } else {
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33 ServletException th = (ServletException)e;
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34 if( MinorServletException.isIn(th) )
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35 throw new IOException(th);
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36 throw th;
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37 }
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38 }
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39 }
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40
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41 public void init(FilterConfig arg0) throws ServletException { }
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42
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43 }
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