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19 package org.eclipse.jetty.server.handler;
20
21
22 import java.util.ArrayList;
23 import java.util.Arrays;
24 import java.util.List;
25
26 import org.eclipse.jetty.server.Handler;
27 import org.eclipse.jetty.server.HandlerContainer;
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34
35 public abstract class AbstractHandlerContainer extends AbstractHandler implements HandlerContainer
36 {
37
38 public AbstractHandlerContainer()
39 {
40 }
41
42
43 @Override
44 public Handler[] getChildHandlers()
45 {
46 List<Handler> list=new ArrayList<>();
47 expandChildren(list,null);
48 return list.toArray(new Handler[list.size()]);
49 }
50
51
52 @Override
53 public Handler[] getChildHandlersByClass(Class<?> byclass)
54 {
55 List<Handler> list=new ArrayList<>();
56 expandChildren(list,byclass);
57 return list.toArray(new Handler[list.size()]);
58 }
59
60
61 @Override
62 public <T extends Handler> T getChildHandlerByClass(Class<T> byclass)
63 {
64 List<Handler> list=new ArrayList<>();
65 expandChildren(list,byclass);
66 if (list.isEmpty())
67 return null;
68 return (T)list.get(0);
69 }
70
71
72 protected void expandChildren(List<Handler> list, Class<?> byClass)
73 {
74 }
75
76
77 protected void expandHandler(Handler handler, List<Handler> list, Class<?> byClass)
78 {
79 if (handler==null)
80 return;
81
82 if (byClass==null || byClass.isAssignableFrom(handler.getClass()))
83 list.add(handler);
84
85 if (handler instanceof AbstractHandlerContainer)
86 ((AbstractHandlerContainer)handler).expandChildren(list, byClass);
87 else if (handler instanceof HandlerContainer)
88 {
89 HandlerContainer container = (HandlerContainer)handler;
90 Handler[] handlers=byClass==null?container.getChildHandlers():container.getChildHandlersByClass(byClass);
91 list.addAll(Arrays.asList(handlers));
92 }
93 }
94
95
96 public static <T extends HandlerContainer> T findContainerOf(HandlerContainer root,Class<T>type, Handler handler)
97 {
98 if (root==null || handler==null)
99 return null;
100
101 Handler[] branches=root.getChildHandlersByClass(type);
102 if (branches!=null)
103 {
104 for (Handler h:branches)
105 {
106 T container = (T)h;
107 Handler[] candidates = container.getChildHandlersByClass(handler.getClass());
108 if (candidates!=null)
109 {
110 for (Handler c:candidates)
111 if (c==handler)
112 return container;
113 }
114 }
115 }
116 return null;
117 }
118 }