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1 /*
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2 Copyright (c) 2008 Franklin Schmidt <fschmidt@gmail.com>
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3
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4 Permission is hereby granted, free of charge, to any person obtaining a copy
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5 of this software and associated documentation files (the "Software"), to deal
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6 in the Software without restriction, including without limitation the rights
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7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 copies of the Software, and to permit persons to whom the Software is
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9 furnished to do so, subject to the following conditions:
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10
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11 The above copyright notice and this permission notice shall be included in
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12 all copies or substantial portions of the Software.
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13
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14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 THE SOFTWARE.
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21 */
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22
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23 package fschmidt.db;
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24
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25 import java.util.List;
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26 import java.util.ArrayList;
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27
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28
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29 public final class ListenerList<T> implements Listener<T> {
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30 private List<Listener<? super T>> listeners = new ArrayList<Listener<? super T>>();
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31 private Exception firstFired = null;
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32
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33 public synchronized void add(Listener<? super T> listener) {
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34 if( firstFired != null )
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35 throw new IllegalStateException("adding to ListenerList after already in use",firstFired);
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36 listeners.add(listener);
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37 }
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38 /*
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39 public synchronized void remove(Listener<? super T> listener) {
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40 listeners.remove(listener);
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41 }
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42 */
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43 public void event(T obj) {
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44 synchronized(this) {
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45 if( firstFired == null )
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46 firstFired = new Exception("first fired");
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47 }
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48 for( Listener<? super T> listener : listeners ) {
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49 listener.event(obj);
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50 }
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51 }
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52
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53 public boolean isEmpty() {
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54 return listeners.isEmpty();
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55 }
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56 }
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