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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.util.java;
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24
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25 import java.util.List;
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26 import java.util.AbstractList;
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27 import java.util.ArrayList;
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28 import java.lang.ref.WeakReference;
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29
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30
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31 public final class WeakList<E> extends AbstractList<E> {
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32 private List<WeakReference<E>> list = new ArrayList<WeakReference<E>>();
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33
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34 public void removeNulls() {
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35 while( remove(null) );
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36 }
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37
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38 public int size() {
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39 return list.size();
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40 }
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41
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42 public E get(int index) {
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43 WeakReference<E> ref = list.get(index);
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44 return ref==null ? null : ref.get();
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45 }
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46
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47 public E set(int index,E element) {
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48 WeakReference<E> ref = list.set(index,new WeakReference<E>(element));
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49 return ref==null ? null : ref.get();
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50 }
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51
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52 public boolean add(E element) {
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53 return list.add(new WeakReference<E>(element));
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54 }
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55
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56 public void add(int index,E element) {
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57 list.add(index,new WeakReference<E>(element));
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58 }
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59
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60 public E remove(int index) {
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61 WeakReference<E> ref = list.remove(index);
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62 return ref==null ? null : ref.get();
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63 }
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64
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65 public <T> T[] toArray(T[] a) {
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66 removeNulls();
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67 return super.toArray(a);
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68 }
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69 }
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