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46 lines
1.0 KiB
Java
46 lines
1.0 KiB
Java
package org.thoughtcrime.securesms.util;
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import androidx.lifecycle.MutableLiveData;
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import android.database.ContentObserver;
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import androidx.annotation.NonNull;
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import org.thoughtcrime.securesms.database.ObservableContent;
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import java.io.Closeable;
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/**
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* Implementation of {@link androidx.lifecycle.LiveData} that will handle closing the contained
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* {@link Closeable} when the value changes.
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*/
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public class ObservingLiveData<E extends ObservableContent> extends MutableLiveData<E> {
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private ContentObserver observer;
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@Override
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public void setValue(E value) {
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E previous = getValue();
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if (previous != null) {
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previous.unregisterContentObserver(observer);
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Util.close(previous);
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}
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value.registerContentObserver(observer);
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super.setValue(value);
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}
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public void close() {
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E value = getValue();
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if (value != null) {
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value.unregisterContentObserver(observer);
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Util.close(value);
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}
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}
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public void registerContentObserver(@NonNull ContentObserver observer) {
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this.observer = observer;
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}
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}
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