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18 package org.apache.log4j.filter;
19
20 import org.apache.log4j.spi.Filter;
21 import org.apache.log4j.spi.LoggingEvent;
22
23
24 /***
25 This filter drops all logging events.
26
27 <p>You can add this filter to the end of a filter chain to
28 switch from the default "accept all unless instructed otherwise"
29 filtering behaviour to a "deny all unless instructed otherwise"
30 behaviour.
31
32
33 @author Ceki Gülcü
34
35 @since 0.9.0 */
36 public class DenyAllFilter extends Filter {
37
38 /***
39 Returns <code>null</code> as there are no options.
40
41 @deprecated We now use JavaBeans introspection to configure
42 components. Options strings are no longer needed.
43 */
44 public
45 String[] getOptionStrings() {
46 return null;
47 }
48
49
50 /***
51 No options to set.
52
53 @deprecated Use the setter method for the option directly instead
54 of the generic <code>setOption</code> method.
55 */
56 public
57 void setOption(String key, String value) {
58 }
59
60 /***
61 Always returns the integer constant {@link Filter#DENY}
62 regardless of the {@link LoggingEvent} parameter.
63
64 @param event The LoggingEvent to filter.
65 @return Always returns {@link Filter#DENY}.
66 */
67 public
68 int decide(LoggingEvent event) {
69 return Filter.DENY;
70 }
71 }
72