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14 package org.eclipse.jetty.util.component;
15 import java.util.EventListener;
16
17 import org.eclipse.jetty.util.LazyList;
18 import org.eclipse.jetty.util.log.Log;
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41 public class Container
42 {
43 private Object _listeners;
44
45 public synchronized void addEventListener(Container.Listener listener)
46 {
47 _listeners=LazyList.add(_listeners,listener);
48 }
49
50 public synchronized void removeEventListener(Container.Listener listener)
51 {
52 _listeners=LazyList.remove(_listeners,listener);
53 }
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62 public synchronized void update(Object parent, Object oldChild, final Object child, String relationship)
63 {
64 if (oldChild!=null && !oldChild.equals(child))
65 remove(parent,oldChild,relationship);
66 if (child!=null && !child.equals(oldChild))
67 add(parent,child,relationship);
68 }
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78 public synchronized void update(Object parent, Object oldChild, final Object child, String relationship,boolean addRemove)
79 {
80 if (oldChild!=null && !oldChild.equals(child))
81 {
82 remove(parent,oldChild,relationship);
83 if (addRemove)
84 removeBean(oldChild);
85 }
86
87 if (child!=null && !child.equals(oldChild))
88 {
89 if (addRemove)
90 addBean(child);
91 add(parent,child,relationship);
92 }
93 }
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103 public synchronized void update(Object parent, Object[] oldChildren, final Object[] children, String relationship)
104 {
105 update(parent,oldChildren,children,relationship,false);
106 }
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117 public synchronized void update(Object parent, Object[] oldChildren, final Object[] children, String relationship, boolean addRemove)
118 {
119 Object[] newChildren = null;
120 if (children!=null)
121 {
122 newChildren = new Object[children.length];
123
124 for (int i=children.length;i-->0;)
125 {
126 boolean new_child=true;
127 if (oldChildren!=null)
128 {
129 for (int j=oldChildren.length;j-->0;)
130 {
131 if (children[i]!=null && children[i].equals(oldChildren[j]))
132 {
133 oldChildren[j]=null;
134 new_child=false;
135 }
136 }
137 }
138 if (new_child)
139 newChildren[i]=children[i];
140 }
141 }
142
143 if (oldChildren!=null)
144 {
145 for (int i=oldChildren.length;i-->0;)
146 {
147 if (oldChildren[i]!=null)
148 {
149 remove(parent,oldChildren[i],relationship);
150 if (addRemove)
151 removeBean(oldChildren[i]);
152 }
153 }
154 }
155
156 if (newChildren!=null)
157 {
158 for (int i=0;i<newChildren.length;i++)
159 if (newChildren[i]!=null)
160 {
161 if (addRemove)
162 addBean(newChildren[i]);
163 add(parent,newChildren[i],relationship);
164 }
165 }
166 }
167
168
169 public void addBean(Object obj)
170 {
171 if (_listeners!=null)
172 {
173 for (int i=0; i<LazyList.size(_listeners); i++)
174 {
175 Listener listener=(Listener)LazyList.get(_listeners, i);
176 listener.addBean(obj);
177 }
178 }
179 }
180
181
182 public void removeBean(Object obj)
183 {
184 if (_listeners!=null)
185 {
186 for (int i=0; i<LazyList.size(_listeners); i++)
187 ((Listener)LazyList.get(_listeners, i)).removeBean(obj);
188 }
189 }
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197 private void add(Object parent, Object child, String relationship)
198 {
199 if (Log.isDebugEnabled())
200 Log.debug("Container "+parent+" + "+child+" as "+relationship);
201 if (_listeners!=null)
202 {
203 Relationship event=new Relationship(this,parent,child,relationship);
204 for (int i=0; i<LazyList.size(_listeners); i++)
205 ((Listener)LazyList.get(_listeners, i)).add(event);
206 }
207 }
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215 private void remove(Object parent, Object child, String relationship)
216 {
217 if (Log.isDebugEnabled())
218 Log.debug("Container "+parent+" - "+child+" as "+relationship);
219 if (_listeners!=null)
220 {
221 Relationship event=new Relationship(this,parent,child,relationship);
222 for (int i=0; i<LazyList.size(_listeners); i++)
223 ((Listener)LazyList.get(_listeners, i)).remove(event);
224 }
225 }
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232 public static class Relationship
233 {
234 private Object _parent;
235 private Object _child;
236 private String _relationship;
237 private Container _container;
238
239 private Relationship(Container container, Object parent,Object child, String relationship)
240 {
241 _container=container;
242 _parent=parent;
243 _child=child;
244 _relationship=relationship;
245 }
246
247 public Container getContainer()
248 {
249 return _container;
250 }
251
252 public Object getChild()
253 {
254 return _child;
255 }
256
257 public Object getParent()
258 {
259 return _parent;
260 }
261
262 public String getRelationship()
263 {
264 return _relationship;
265 }
266
267 @Override
268 public String toString()
269 {
270 return _parent+"---"+_relationship+"-->"+_child;
271 }
272
273 @Override
274 public int hashCode()
275 {
276 return _parent.hashCode()+_child.hashCode()+_relationship.hashCode();
277 }
278
279 @Override
280 public boolean equals(Object o)
281 {
282 if (o==null || !(o instanceof Relationship))
283 return false;
284 Relationship r = (Relationship)o;
285 return r._parent==_parent && r._child==_child && r._relationship.equals(_relationship);
286 }
287 }
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293 public interface Listener extends EventListener
294 {
295 public void addBean(Object bean);
296 public void removeBean(Object bean);
297 public void add(Container.Relationship relationship);
298 public void remove(Container.Relationship relationship);
299
300 }
301 }