81 lines
2.2 KiB
Java
81 lines
2.2 KiB
Java
package androidx.recyclerview.widget;
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import android.util.SparseArray;
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import java.lang.reflect.Array;
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public class TileList<T> {
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public Tile<T> mLastAccessedTile;
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public final int mTileSize;
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private final SparseArray<Tile<T>> mTiles = new SparseArray<>(10);
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public static class Tile<T> {
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public int mItemCount;
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public final T[] mItems;
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public Tile<T> mNext;
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public int mStartPosition;
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public Tile(Class<T> cls, int i) {
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this.mItems = (T[]) ((Object[]) Array.newInstance((Class<?>) cls, i));
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}
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public boolean containsPosition(int i) {
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int i2 = this.mStartPosition;
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return i2 <= i && i < i2 + this.mItemCount;
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}
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public T getByPosition(int i) {
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return this.mItems[i - this.mStartPosition];
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}
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}
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public TileList(int i) {
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this.mTileSize = i;
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}
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public Tile<T> addOrReplace(Tile<T> tile) {
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int indexOfKey = this.mTiles.indexOfKey(tile.mStartPosition);
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if (indexOfKey < 0) {
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this.mTiles.put(tile.mStartPosition, tile);
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return null;
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}
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Tile<T> valueAt = this.mTiles.valueAt(indexOfKey);
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this.mTiles.setValueAt(indexOfKey, tile);
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if (this.mLastAccessedTile == valueAt) {
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this.mLastAccessedTile = tile;
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}
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return valueAt;
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}
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public void clear() {
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this.mTiles.clear();
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}
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public Tile<T> getAtIndex(int i) {
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return this.mTiles.valueAt(i);
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}
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public T getItemAt(int i) {
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Tile<T> tile = this.mLastAccessedTile;
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if (tile == null || !tile.containsPosition(i)) {
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int indexOfKey = this.mTiles.indexOfKey(i - (i % this.mTileSize));
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if (indexOfKey < 0) {
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return null;
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}
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this.mLastAccessedTile = this.mTiles.valueAt(indexOfKey);
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}
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return this.mLastAccessedTile.getByPosition(i);
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}
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public Tile<T> removeAtPos(int i) {
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Tile<T> tile = this.mTiles.get(i);
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if (this.mLastAccessedTile == tile) {
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this.mLastAccessedTile = null;
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}
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this.mTiles.delete(i);
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return tile;
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}
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public int size() {
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return this.mTiles.size();
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}
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}
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