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1 package org.kohsuke.stapler;
2
3 import java.lang.reflect.InvocationTargetException  ;
4 import java.util.HashMap ;
5 import java.util.Map ;
6
7
16 public abstract class TearOffSupport {
17 private volatile Map <Class ,Object > tearOffs;
18
19 public final <T> T getTearOff(Class <T> t) {
20 Map <Class ,Object > m = tearOffs;
21 if(m==null) return null;
22 return (T)m.get(t);
23 }
24
25 public final <T> T loadTearOff(Class <T> t) {
26 T o = getTearOff(t);
27 if(o==null) {
28 try {
29 o = t.getConstructor(getClass()).newInstance(this);
30 setTearOff(t,o);
31 } catch (InstantiationException e) {
32 throw new InstantiationError (e.getMessage());
33 } catch (IllegalAccessException e) {
34 throw new IllegalAccessError (e.getMessage());
35 } catch (InvocationTargetException e) {
36 Throwable ex = e.getTargetException();
37 if(ex instanceof RuntimeException )
38 throw (RuntimeException )ex;
39 if(ex instanceof Error )
40 throw (Error )ex;
41 throw new Error (e);
42 } catch (NoSuchMethodException e) {
43 throw new NoSuchMethodError (e.getMessage());
44 }
45 }
46 return o;
47 }
48
49 public synchronized <T> void setTearOff(Class <T> type, T instance) {
50 Map <Class ,Object > m = tearOffs;
51 Map <Class ,Object > r = m!=null ? new HashMap <Class , Object >(tearOffs) : new HashMap <Class ,Object >();
52 r.put(type,instance);
53 tearOffs = r;
54 }
55 }
56 |
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