1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.util.AbstractCollection;
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5 | import java.util.ArrayList;
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6 | import java.util.Iterator;
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7 |
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8 | /**
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9 | * This is a proxy of a collection that notifies a listener on every collection change
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10 | * @author Michael Zangl
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11 | *
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12 | * @param <T> The entry type
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13 | * @since 12267 (extracted from GpxData)
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14 | * @since 12156
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15 | */
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16 | public class ListeningCollection<T> extends AbstractCollection<T> {
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17 | private final ArrayList<T> base;
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18 | private final Runnable runOnModification;
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19 |
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20 | /**
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21 | * Constructs a new {@code ListeningCollection}.
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22 | * @param base base collection
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23 | * @param runOnModification runnable run at each modification
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24 | */
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25 | public ListeningCollection(ArrayList<T> base, Runnable runOnModification) {
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26 | this.base = base;
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27 | this.runOnModification = runOnModification;
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28 | }
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29 |
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30 | @Override
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31 | public final Iterator<T> iterator() {
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32 | Iterator<T> it = base.iterator();
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33 | return new Iterator<T>() {
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34 | private T object;
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35 |
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36 | @Override
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37 | public boolean hasNext() {
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38 | return it.hasNext();
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39 | }
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40 |
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41 | @Override
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42 | public T next() {
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43 | object = it.next();
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44 | return object;
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45 | }
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46 |
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47 | @Override
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48 | public void remove() {
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49 | if (object != null) {
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50 | removed(object);
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51 | object = null;
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52 | }
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53 | it.remove();
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54 | }
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55 | };
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56 | }
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57 |
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58 | @Override
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59 | public final int size() {
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60 | return base.size();
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61 | }
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62 |
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63 | @Override
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64 | @SuppressWarnings("unchecked")
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65 | public final boolean remove(Object o) {
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66 | boolean remove = base.remove(o);
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67 | if (remove) {
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68 | removed((T) o);
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69 | }
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70 | return remove;
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71 | }
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72 |
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73 | @Override
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74 | public final boolean add(T e) {
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75 | boolean add = base.add(e);
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76 | added(e);
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77 | return add;
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78 | }
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79 |
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80 | /**
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81 | * Called when an object is removed.
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82 | * @param object the removed object
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83 | */
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84 | protected void removed(T object) {
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85 | runOnModification.run();
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86 | }
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87 |
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88 | /**
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89 | * Called when an object is added.
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90 | * @param object the added object
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91 | */
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92 | protected void added(T object) {
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93 | runOnModification.run();
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94 | }
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95 | }
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