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author | Samuel Holland <samuel@sholland.org> | 2017-08-17 02:40:05 -0500 |
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committer | Samuel Holland <samuel@sholland.org> | 2017-08-17 02:40:05 -0500 |
commit | 97149fff3f867e25103c632138468010cc804811 (patch) | |
tree | 287ffce3cf8dcfe09a824720bc3dca699b62672b /app/src/main/java/com/wireguard/android/ObservableTreeMap.java | |
parent | preferences: Control restoring enabled configs (diff) | |
download | wireguard-android-97149fff3f867e25103c632138468010cc804811.tar.xz wireguard-android-97149fff3f867e25103c632138468010cc804811.zip |
ObservableMapAdapter: Based on an observable TreeMap
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to '')
-rw-r--r-- | app/src/main/java/com/wireguard/android/ObservableTreeMap.java | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/app/src/main/java/com/wireguard/android/ObservableTreeMap.java b/app/src/main/java/com/wireguard/android/ObservableTreeMap.java new file mode 100644 index 00000000..b0444d66 --- /dev/null +++ b/app/src/main/java/com/wireguard/android/ObservableTreeMap.java @@ -0,0 +1,67 @@ +package com.wireguard.android; + +import android.databinding.MapChangeRegistry; +import android.databinding.ObservableMap; +import android.support.annotation.NonNull; + +import java.util.Iterator; +import java.util.Map; +import java.util.TreeMap; + +/** + * Observable version of a TreeMap. Only notifies for changes made through methods, not iterators or + * views. This behavior is in line with that of ObservableArrayMap. + */ + +public class ObservableTreeMap<K, V> extends TreeMap<K, V> implements ObservableSortedMap<K, V> { + private transient MapChangeRegistry listeners; + + @Override + public void clear() { + super.clear(); + notifyChange(null); + } + + @Override + public void addOnMapChangedCallback( + final OnMapChangedCallback<? extends ObservableMap<K, V>, K, V> listener) { + if (listeners == null) + listeners = new MapChangeRegistry(); + listeners.add(listener); + } + + private void notifyChange(final K key) { + if (listeners != null) + listeners.notifyChange(this, key); + } + + @Override + public V put(final K key, final V value) { + final V oldValue = super.put(key, value); + notifyChange(key); + return oldValue; + } + + @Override + public void putAll(@NonNull final Map<? extends K, ? extends V> map) { + super.putAll(map); + for (final K key : map.keySet()) + notifyChange(key); + } + + @Override + public V remove(final Object key) { + final V oldValue = super.remove(key); + @SuppressWarnings("unchecked") + final K k = (K) key; + notifyChange(k); + return oldValue; + } + + @Override + public void removeOnMapChangedCallback( + final OnMapChangedCallback<? extends ObservableMap<K, V>, K, V> listener) { + if (listeners != null) + listeners.remove(listener); + } +} |