91 lines
2 KiB
Java
91 lines
2 KiB
Java
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package org.thoughtcrime.securesms.util;
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import android.content.Context;
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import android.database.Cursor;
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import android.support.v4.content.AsyncTaskLoader;
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/**
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* A Loader similar to CursorLoader that doesn't require queries to go through the ContentResolver
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* to get the benefits of reloading when content has changed.
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*/
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public abstract class AbstractCursorLoader extends AsyncTaskLoader<Cursor> {
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private static final String TAG = AbstractCursorLoader.class.getSimpleName();
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protected final ForceLoadContentObserver observer;
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protected final Context context;
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protected Cursor cursor;
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public AbstractCursorLoader(Context context) {
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super(context);
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this.context = context.getApplicationContext();
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this.observer = new ForceLoadContentObserver();
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}
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public abstract Cursor getCursor();
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@Override
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public void deliverResult(Cursor newCursor) {
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if (isReset()) {
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if (newCursor != null) {
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newCursor.close();
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}
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return;
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}
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Cursor oldCursor = this.cursor;
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this.cursor = newCursor;
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if (isStarted()) {
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super.deliverResult(newCursor);
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}
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if (oldCursor != null && oldCursor != cursor && !oldCursor.isClosed()) {
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oldCursor.close();
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}
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}
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@Override
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protected void onStartLoading() {
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if (cursor != null) {
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deliverResult(cursor);
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}
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if (takeContentChanged() || cursor == null) {
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forceLoad();
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}
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}
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@Override
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protected void onStopLoading() {
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cancelLoad();
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}
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@Override
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public void onCanceled(Cursor cursor) {
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if (cursor != null && !cursor.isClosed()) {
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cursor.close();
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}
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}
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@Override
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public Cursor loadInBackground() {
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Cursor newCursor = getCursor();
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if (newCursor != null) {
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newCursor.getCount();
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newCursor.registerContentObserver(observer);
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}
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return newCursor;
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}
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@Override
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protected void onReset() {
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super.onReset();
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onStopLoading();
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if (cursor != null && !cursor.isClosed()) {
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cursor.close();
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}
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cursor = null;
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}
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}
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