Issue 4181 - Fix FilterEngineTest tests

libadblockplus-android-tests/src/org/adblockplus/libadblockplus/FileSystemUtils.java

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2017 eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.libadblockplus;
+
+import android.util.Log;
+
+import org.adblockplus.libadblockplus.android.Utils;
+
+import java.io.File;
+import java.util.UUID;
+
+public class FileSystemUtils

[anton, 2017/05/10 11:02:33]

BTW we could use Apache file utils in the tests at least.
But the class was already written then, so just using it.

+{
+  private static final String TAG = Utils.getTag(FileSystemUtils.class);
+
+  // File.createTempFile() creates a file instead of just generating unique file name
+
+  public static String generateUniqueFileName(String prefix, String suffix)
+  {
+    StringBuilder sb = new StringBuilder();
+    if (prefix != null)
+    {
+      sb.append(prefix);
+    }
+    sb.append(UUID.randomUUID());
+    if (suffix != null)
+    {
+      sb.append(suffix);
+    }
+    return sb.toString();
+  }
+
+  public static File generateUniqueFile(String prefix, String suffix, File parent)
+  {
+    return new File(parent, generateUniqueFileName(prefix, suffix));
+  }
+
+  public static void delete(String filePath)
+  {
+    delete(new File(filePath));
+  }
+
+  public static void delete(File file)
+  {
+    if (file.isDirectory())
+    {
+      deleteDirectory(file);
+    }
+    else
+    {
+      deleteFile(file);
+    }
+  }
+
+  public static void deleteDirectory(File directory)
+  {
+    File files[] = directory.listFiles();
+    for (File eachFile : files)
+    {
+      delete(eachFile);
+    }
+
+    Log.w(TAG, "Deleting directory " + directory.getAbsolutePath());
+    directory.delete();
+  }
+
+  public static void deleteFile(File file)
+  {
+    Log.w(TAG, "Deleting file " + file.getAbsolutePath());
+    file.delete();
+  }
+}