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1   package ch.qos.logback.access.pattern;
2   
3   import ch.qos.logback.access.spi.AccessEvent;
4   import ch.qos.logback.core.util.OptionHelper;
5   
6   
7   public class RequestHeaderConverter extends AccessConverter {
8   
9     String key;
10  
11    public void start() {
12      key = getFirstOption();
13      if (OptionHelper.isEmpty(key)) {
14        addWarn("Missing key for the requested header. Defaulting to all keys.");
15        key = null;
16      } 
17      super.start();
18    }
19  
20    public String convert(AccessEvent accessEvent) {
21      if(!isStarted()) {
22        return "INACTIVE_HEADER_CONV";
23      }
24      
25      if(key != null) {
26        return accessEvent.getRequestHeader(key);
27      } else {
28        return accessEvent.getRequestHeaderMap().toString();
29      }
30    }
31  
32  }