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19 package org.eclipse.jetty.server.handler;
20
21
22 import java.io.IOException;
23 import java.util.ArrayList;
24 import java.util.Arrays;
25 import java.util.List;
26
27 import org.eclipse.jetty.server.Handler;
28 import org.eclipse.jetty.server.HandlerContainer;
29 import org.eclipse.jetty.util.TypeUtil;
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36
37 public abstract class AbstractHandlerContainer extends AbstractHandler implements HandlerContainer
38 {
39
40 public AbstractHandlerContainer()
41 {
42 }
43
44
45 @Override
46 public Handler[] getChildHandlers()
47 {
48 List<Handler> list=new ArrayList<>();
49 expandChildren(list,null);
50 return list.toArray(new Handler[list.size()]);
51 }
52
53
54 @Override
55 public Handler[] getChildHandlersByClass(Class<?> byclass)
56 {
57 List<Handler> list=new ArrayList<>();
58 expandChildren(list,byclass);
59 return list.toArray(new Handler[list.size()]);
60 }
61
62
63 @Override
64 public <T extends Handler> T getChildHandlerByClass(Class<T> byclass)
65 {
66 List<Handler> list=new ArrayList<>();
67 expandChildren(list,byclass);
68 if (list.isEmpty())
69 return null;
70 return (T)list.get(0);
71 }
72
73
74 protected void expandChildren(List<Handler> list, Class<?> byClass)
75 {
76 }
77
78
79 protected void expandHandler(Handler handler, List<Handler> list, Class<?> byClass)
80 {
81 if (handler==null)
82 return;
83
84 if (byClass==null || byClass.isAssignableFrom(handler.getClass()))
85 list.add(handler);
86
87 if (handler instanceof AbstractHandlerContainer)
88 ((AbstractHandlerContainer)handler).expandChildren(list, byClass);
89 else if (handler instanceof HandlerContainer)
90 {
91 HandlerContainer container = (HandlerContainer)handler;
92 Handler[] handlers=byClass==null?container.getChildHandlers():container.getChildHandlersByClass(byClass);
93 list.addAll(Arrays.asList(handlers));
94 }
95 }
96
97
98 public static <T extends HandlerContainer> T findContainerOf(HandlerContainer root,Class<T>type, Handler handler)
99 {
100 if (root==null || handler==null)
101 return null;
102
103 Handler[] branches=root.getChildHandlersByClass(type);
104 if (branches!=null)
105 {
106 for (Handler h:branches)
107 {
108 T container = (T)h;
109 Handler[] candidates = container.getChildHandlersByClass(handler.getClass());
110 if (candidates!=null)
111 {
112 for (Handler c:candidates)
113 if (c==handler)
114 return container;
115 }
116 }
117 }
118 return null;
119 }
120 }