Issue 4231 - Fix unstable FilterEngineTest.testSetRemoveFilterChangeCallback

libadblockplus-android/src/org/adblockplus/libadblockplus/android/AndroidFileSystem.java

Index: libadblockplus-android/src/org/adblockplus/libadblockplus/android/AndroidFileSystem.java
diff --git a/libadblockplus-android/src/org/adblockplus/libadblockplus/android/AndroidFileSystem.java b/libadblockplus-android/src/org/adblockplus/libadblockplus/android/AndroidFileSystem.java
new file mode 100644
index 0000000000000000000000000000000000000000..8899a8d228431e5c955c252554c4e9a8577de7e8
--- /dev/null
+++ b/libadblockplus-android/src/org/adblockplus/libadblockplus/android/AndroidFileSystem.java
@@ -0,0 +1,150 @@
+/*
+ * 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.android;
+
+import org.adblockplus.libadblockplus.AdblockPlusException;
+import org.adblockplus.libadblockplus.FileSystem;
+import org.adblockplus.libadblockplus.FileSystemUtils;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/**
+ * AndroidFileSystem is inefficient for production files routines
+ * as C++ streams can't pass JNI layer and be converted into Java streams and vice versa.
+ *
+ * So in case of any stream routines full stream content is read in either C++ or Java side
+ * and it's is being passed as string though JNI layer
+ *
+ * AndroidFileSystem is meant to be used in tests mostly
+ */
+public class AndroidFileSystem extends FileSystem
+{
+  private File basePath;
+
+  public File getBasePath()
+  {
+    return basePath;
+  }
+
+  public AndroidFileSystem()
+  {
+  }
+
+  /*
+   * Sets the base path, all paths are considered relative to it.
+   * @param basePath base path
+   */
+  public AndroidFileSystem(File basePath)
+  {
+    this();
+    this.basePath = basePath;
+  }
+
+  private File buildFullPath(String path)
+  {
+    return basePath != null
+      ? new File(basePath, path)
+      : new File(path);
+  }
+
+  @Override
+  public String read(String path)
+  {
+    File file = buildFullPath(path);
+    if (!file.exists())
+    {
+      return null;
+    }
+
+    try
+    {
+      return FileSystemUtils.readFile(file);
+    }
+    catch (FileNotFoundException e)
+    {
+      throw new AdblockPlusException(e);
+    }
+  }
+
+  @Override
+  public void write(String path, String data)
+  {
+    File file = buildFullPath(path);
+    if (file.exists())
+    {
+      file.delete();
+    }
+
+    try
+    {
+      FileSystemUtils.writeFile(file, data);
+    }
+    catch (IOException e)
+    {
+      throw new AdblockPlusException(e);
+    }
+  }
+
+  @Override
+  public void move(String fromPath, String toPath)
+  {
+    File fullFromFile = buildFullPath(fromPath);
+    try
+    {
+      String data = FileSystemUtils.readFile(fullFromFile);
+      write(toPath, data);
+      remove(fromPath);
+    }
+    catch (FileNotFoundException e)
+    {
+      throw new AdblockPlusException(e);
+    }
+  }
+
+  @Override
+  public void remove(String path)
+  {
+    File file = buildFullPath(path);
+    if (file.exists())
+    {
+      file.delete();
+    }
+  }
+
+  @Override
+  public StatResult stat(String path)
+  {
+    File file = buildFullPath(path);
+    return new StatResult(
+      file.exists(),
+      file.isDirectory(),
+      file.isFile(),
+      file.lastModified());
+  }
+
+  @Override
+  public String resolve(String path)
+  {
+    String fullPath = buildFullPath(path).getAbsolutePath();
+    return basePath != null
+      ? fullPath.substring(basePath.getAbsolutePath().length())
+      : fullPath;
+  }
+}