SmartReceiptsTemporaryFileCache.java

package co.smartreceipts.android.utils.cache;

import android.content.Context;
import android.support.annotation.NonNull;

import com.google.common.base.Preconditions;

import java.io.File;
import java.util.concurrent.Executors;

import javax.inject.Inject;

import co.smartreceipts.android.utils.log.Logger;
import wb.android.storage.StorageManager;

/**
 * A bunch of classes.dex files also get saved in {@link Context#getCacheDir()}, so we uses this class
 * to create a special smart receipts subfolder that we can safely wipe upon each app launch
 */
@SuppressWarnings("ResultOfMethodCallIgnored")
public class SmartReceiptsTemporaryFileCache {

    private static final String FOLDER_NAME = "smartReceiptsTmp";

    @Inject
    StorageManager storageManager;

    private final Context mContext;
    private final File mTemporaryCacheFolder;

    public SmartReceiptsTemporaryFileCache(@NonNull Context context) {
        mContext = Preconditions.checkNotNull(context.getApplicationContext());
        mTemporaryCacheFolder = new File(Preconditions.checkNotNull(context.getCacheDir()), FOLDER_NAME);
    }

    @NonNull
    public File getFile(@NonNull String filename) {
        return new File(mTemporaryCacheFolder, filename);
    }

    public void resetCache() {
        Logger.info(SmartReceiptsTemporaryFileCache.this, "Clearing the cached dir");
        Executors.newSingleThreadExecutor().execute(new Runnable() {
            @Override
            public void run() {
                mTemporaryCacheFolder.mkdirs();
                final File[] files = mTemporaryCacheFolder.listFiles();
                if (files != null) {
                    final StorageManager storageManager = StorageManager.getInstance(mContext);
                    for (final File file : files) {
                        Logger.debug(SmartReceiptsTemporaryFileCache.this, "Recursively deleting cached file: {}", file);
                        storageManager.deleteRecursively(file);
                    }
                }
            }
        });
    }
}