1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.preferences;
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3 |
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4 | import org.openstreetmap.josm.spi.preferences.PreferenceChangeEvent;
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5 | import org.openstreetmap.josm.spi.preferences.PreferenceChangedListener;
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6 | import org.openstreetmap.josm.spi.preferences.Config;
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7 |
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8 | /**
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9 | * This is an old-style cached preference value.
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10 | *
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11 | * You can replace this using the {@link StringProperty#cached()}, {@link BooleanProperty#cached()} accessors
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12 | *
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13 | * @param <T> The value type of this property
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14 | */
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15 | public abstract class CachedProperty<T> extends AbstractProperty<T> implements PreferenceChangedListener {
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16 |
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17 | private final String defaultValueAsString;
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18 | private T value;
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19 | private int updateCount;
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20 |
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21 | protected CachedProperty(String key, String defaultValueAsString) {
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22 | super(key, null);
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23 | Config.getPref().addKeyPreferenceChangeListener(key, this);
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24 | this.defaultValueAsString = defaultValueAsString;
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25 | updateValue();
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26 | }
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27 |
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28 | protected final void updateValue() {
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29 | if (!Config.getPref().get(key).isEmpty()) {
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30 | this.value = fromString(Config.getPref().get(key));
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31 | } else {
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32 | this.value = getDefaultValue();
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33 | }
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34 | updateCount++;
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35 | }
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36 |
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37 | protected abstract T fromString(String s);
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38 |
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39 | @Override
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40 | public T get() {
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41 | return value;
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42 | }
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43 |
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44 | public void put(String value) {
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45 | Config.getPref().put(key, value);
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46 | this.value = fromString(value);
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47 | updateCount++;
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48 | }
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49 |
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50 | @Override
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51 | public final boolean put(T value) {
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52 | // Not used
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53 | throw new UnsupportedOperationException("You cannot use put(T). Use put(String) instead.");
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54 | }
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55 |
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56 | public int getUpdateCount() {
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57 | return updateCount;
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58 | }
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59 |
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60 | @Override
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61 | public T getDefaultValue() {
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62 | return fromString(getDefaultValueAsString());
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63 | }
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64 |
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65 | public String getDefaultValueAsString() {
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66 | return defaultValueAsString;
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67 | }
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68 |
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69 | public String getAsString() {
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70 | return getPreferences().get(getKey(), getDefaultValueAsString());
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71 | }
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72 |
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73 | @Override
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74 | public void preferenceChanged(PreferenceChangeEvent e) {
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75 | if (e.getKey().equals(key)) {
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76 | updateValue();
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77 | }
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78 | }
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79 |
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80 | }
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