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package it.niedermann.nextcloud.deck.ui.card.attachments.picker;
import static android.database.Cursor.FIELD_TYPE_INTEGER;
import static android.database.Cursor.FIELD_TYPE_NULL;
import static androidx.recyclerview.widget.RecyclerView.NO_ID;
import static java.util.Objects.requireNonNull;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.util.Pair;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.RequestBuilder;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.function.BiConsumer;
/**
* An {@link RecyclerView.Adapter} which provides previews of one type of files and also an option to open a native dialog.
* <p>
* Example: Previews for images of the gallery as well a one option to take a photo
*/
public abstract class AbstractCursorPickerAdapter<T extends RecyclerView.ViewHolder> extends AbstractPickerAdapter<T> {
private final int count;
protected final int columnIndex;
private final int columnIndexType;
@NonNull
protected final BiConsumer<Uri, Pair<String, RequestBuilder<?>>> onSelect;
@NonNull
protected final Runnable openNativePicker;
@NonNull
protected final Cursor cursor;
@NonNull
protected final ContentResolver contentResolver;
/**
* Should be used to bind heavy operations like when dealing with {@link Bitmap}.
* This must only be one {@link Thread} because otherwise the cursor might change while fetching data from it.
*/
@NonNull
protected final ExecutorService bindExecutor = Executors.newSingleThreadExecutor();
public AbstractCursorPickerAdapter(@NonNull Context context, @NonNull BiConsumer<Uri, Pair<String, RequestBuilder<?>>> onSelect, @NonNull Runnable openNativePicker, Uri subject, String idColumn, String sortOrder) {
this(context, onSelect, openNativePicker, subject, idColumn, new String[]{idColumn}, sortOrder);
}
public AbstractCursorPickerAdapter(@NonNull Context context, @NonNull BiConsumer<Uri, Pair<String, RequestBuilder<?>>> onSelect, @NonNull Runnable openNativePicker, Uri subject, String idColumn, String[] requestedColumns, String sortOrder) {
this(context, onSelect, openNativePicker, idColumn, requireNonNull(context.getContentResolver().query(subject, requestedColumns, null, null, sortOrder)));
}
public AbstractCursorPickerAdapter(@NonNull Context context, @NonNull BiConsumer<Uri, Pair<String, RequestBuilder<?>>> onSelect, @NonNull Runnable openNativePicker, String idColumn, @NonNull Cursor cursor) {
this.contentResolver = context.getContentResolver();
this.onSelect = onSelect;
this.openNativePicker = openNativePicker;
this.cursor = cursor;
this.cursor.moveToFirst();
this.columnIndex = this.cursor.getColumnIndex(idColumn);
this.count = cursor.getCount() + 1;
this.columnIndexType = (this.count > 1) ? this.cursor.getType(columnIndex) : FIELD_TYPE_NULL;
setHasStableIds(true);
}
/**
* Moves the {@link #cursor} to the given position
*/
@Override
public long getItemId(int position) {
if (!cursor.isClosed() && cursor.moveToPosition(position - 1)) {
//noinspection SwitchStatementWithTooFewBranches
switch (columnIndexType) {
case FIELD_TYPE_INTEGER:
return cursor.getLong(columnIndex);
default:
throw new IllegalStateException("Unknown type for columnIndex \"" + columnIndex + "\": " + columnIndexType);
}
} else {
return NO_ID;
}
}
@Override
public int getItemCount() {
return count;
}
/**
* Call this method when the {@link AbstractCursorPickerAdapter} is no longer need to free resources.
*/
public void onDestroy() {
cursor.close();
bindExecutor.shutdownNow();
}
}
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