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annotate src/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java @ 1023:27f3dc761452

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author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 01 Nov 2016 03:44:46 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server.handler;
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20
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21
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22 import java.io.IOException;
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23
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24 import org.eclipse.jetty.server.Handler;
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25 import org.eclipse.jetty.server.HandlerContainer;
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26 import org.eclipse.jetty.util.LazyList;
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27 import org.eclipse.jetty.util.TypeUtil;
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28
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29
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30 /* ------------------------------------------------------------ */
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31 /** Abstract Handler Container.
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32 * This is the base class for handlers that may contain other handlers.
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33 *
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34 */
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35 public abstract class AbstractHandlerContainer extends AbstractHandler implements HandlerContainer
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36 {
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37 /* ------------------------------------------------------------ */
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38 public AbstractHandlerContainer()
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39 {
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40 }
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41
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42 /* ------------------------------------------------------------ */
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43 public Handler[] getChildHandlers()
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44 {
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45 Object list = expandChildren(null,null);
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46 return (Handler[])LazyList.toArray(list, Handler.class);
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47 }
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48
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49 /* ------------------------------------------------------------ */
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50 public Handler[] getChildHandlersByClass(Class<?> byclass)
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51 {
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52 Object list = expandChildren(null,byclass);
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53 return (Handler[])LazyList.toArray(list, byclass);
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54 }
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55
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56 /* ------------------------------------------------------------ */
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57 public <T extends Handler> T getChildHandlerByClass(Class<T> byclass)
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58 {
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59 // TODO this can be more efficient?
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60 Object list = expandChildren(null,byclass);
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61 if (list==null)
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62 return null;
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63 return (T)LazyList.get(list, 0);
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64 }
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65
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66 /* ------------------------------------------------------------ */
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67 protected Object expandChildren(Object list, Class<?> byClass)
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68 {
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69 return list;
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70 }
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71
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72 /* ------------------------------------------------------------ */
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73 protected Object expandHandler(Handler handler, Object list, Class<Handler> byClass)
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74 {
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75 if (handler==null)
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76 return list;
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77
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78 if (byClass==null || byClass.isAssignableFrom(handler.getClass()))
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79 list=LazyList.add(list, handler);
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80
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81 if (handler instanceof AbstractHandlerContainer)
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82 list=((AbstractHandlerContainer)handler).expandChildren(list, byClass);
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83 else if (handler instanceof HandlerContainer)
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84 {
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85 HandlerContainer container = (HandlerContainer)handler;
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86 Handler[] handlers=byClass==null?container.getChildHandlers():container.getChildHandlersByClass(byClass);
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87 list=LazyList.addArray(list, handlers);
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88 }
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89
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90 return list;
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91 }
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92
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93 /* ------------------------------------------------------------ */
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94 public static <T extends HandlerContainer> T findContainerOf(HandlerContainer root,Class<T>type, Handler handler)
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95 {
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96 if (root==null || handler==null)
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97 return null;
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98
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99 Handler[] branches=root.getChildHandlersByClass(type);
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100 if (branches!=null)
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101 {
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102 for (Handler h:branches)
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103 {
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104 T container = (T)h;
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105 Handler[] candidates = container.getChildHandlersByClass(handler.getClass());
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106 if (candidates!=null)
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107 {
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108 for (Handler c:candidates)
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109 if (c==handler)
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110 return container;
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111 }
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112 }
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113 }
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114 return null;
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115 }
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116
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117 /* ------------------------------------------------------------ */
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118 public void dump(Appendable out,String indent) throws IOException
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119 {
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120 dumpThis(out);
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121 dump(out,indent,getBeans(),TypeUtil.asList(getHandlers()));
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122 }
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123 }