Moxie Marlinspike
8 years ago
parent
4d889a45e2
commit
cb670d6783
@ -0,0 +1,111 @@
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package org.thoughtcrime.securesms.database;
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import android.content.Context;
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import android.database.Cursor;
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import android.support.annotation.NonNull;
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import android.support.v7.widget.RecyclerView;
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import android.util.Log;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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public abstract class FastCursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder, T>
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extends CursorRecyclerViewAdapter<VH>
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{
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private static final String TAG = FastCursorRecyclerViewAdapter.class.getSimpleName();
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private final LinkedList<T> fastRecords = new LinkedList<>();
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private final List<Long> releasedRecordIds = new LinkedList<>();
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protected FastCursorRecyclerViewAdapter(Context context, Cursor cursor) {
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super(context, cursor);
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}
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public void addFastRecord(@NonNull T record) {
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fastRecords.addFirst(record);
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notifyDataSetChanged();
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}
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public void releaseFastRecord(long id) {
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synchronized (releasedRecordIds) {
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releasedRecordIds.add(id);
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}
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}
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protected void cleanFastRecords() {
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synchronized (releasedRecordIds) {
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Iterator<Long> releaseIdIterator = releasedRecordIds.iterator();
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while (releaseIdIterator.hasNext()) {
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long releasedId = releaseIdIterator.next();
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Iterator<T> fastRecordIterator = fastRecords.iterator();
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while (fastRecordIterator.hasNext()) {
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if (isRecordForId(fastRecordIterator.next(), releasedId)) {
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fastRecordIterator.remove();
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releaseIdIterator.remove();
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break;
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}
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}
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}
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}
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}
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protected abstract T getRecordFromCursor(@NonNull Cursor cursor);
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protected abstract void onBindItemViewHolder(VH viewHolder, @NonNull T record);
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protected abstract long getItemId(@NonNull T record);
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protected abstract int getItemViewType(@NonNull T record);
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protected abstract boolean isRecordForId(@NonNull T record, long id);
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@Override
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public int getItemViewType(@NonNull Cursor cursor) {
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T record = getRecordFromCursor(cursor);
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return getItemViewType(record);
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}
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@Override
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public void onBindItemViewHolder(VH viewHolder, @NonNull Cursor cursor) {
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T record = getRecordFromCursor(cursor);
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onBindItemViewHolder(viewHolder, record);
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}
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@Override
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public void onBindFastAccessItemViewHolder(VH viewHolder, int position) {
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onBindItemViewHolder(viewHolder, fastRecords.get(getCalculatedPosition(position)));
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}
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@Override
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protected int getFastAccessSize() {
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return fastRecords.size();
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}
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protected T getRecordForPositionOrThrow(int position) {
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if (isFastAccessPosition(position)) {
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return fastRecords.get(getCalculatedPosition(position));
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} else {
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Cursor cursor = getCursorAtPositionOrThrow(position);
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return getRecordFromCursor(cursor);
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}
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}
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protected int getFastAccessItemViewType(int position) {
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return getItemViewType(fastRecords.get(getCalculatedPosition(position)));
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}
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protected boolean isFastAccessPosition(int position) {
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position = getCalculatedPosition(position);
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return position >= 0 && position < fastRecords.size();
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}
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protected long getFastAccessItemId(int position) {
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return getItemId(fastRecords.get(getCalculatedPosition(position)));
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}
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private int getCalculatedPosition(int position) {
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return hasHeaderView() ? position - 1 : position;
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}
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}
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