Issue 4231 - Fix unstable FilterEngineTest.testSetRemoveFilterChangeCallback

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

Index: libadblockplus-android/src/org/adblockplus/libadblockplus/FileSystem.java
diff --git a/libadblockplus-android/src/org/adblockplus/libadblockplus/FileSystem.java b/libadblockplus-android/src/org/adblockplus/libadblockplus/FileSystem.java
new file mode 100644
index 0000000000000000000000000000000000000000..7f56f0a61bd953d769a97caef14dace0a3313147
--- /dev/null
+++ b/libadblockplus-android/src/org/adblockplus/libadblockplus/FileSystem.java
@@ -0,0 +1,144 @@
+/*
+ * 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;
+
+public abstract class FileSystem implements Disposable
+{
+  private final Disposer disposer;
+  protected final long ptr;
+
+  static
+  {
+    System.loadLibrary("adblockplus-jni");
+    registerNatives();
+  }
+
+  public FileSystem()
+  {
+    this.ptr = ctor(this);
+    this.disposer = new Disposer(this, new DisposeWrapper(this.ptr));
+  }
+
+  public static final class StatResult
+  {
+    private boolean exists;
+
+    public boolean exists()
+    {
+      return exists;
+    }
+
+    private boolean isDirectory;
+
+    public boolean isDirectory()
+    {
+      return isDirectory;
+    }
+
+    private boolean isFile;
+
+    public boolean isFile()
+    {
+      return isFile;
+    }
+
+    private long lastModified;
+
+    public long getLastModified()
+    {
+      return lastModified;
+    }
+
+    public StatResult(boolean exists, boolean isDirectory, boolean isFile, long lastModified)
+    {
+      this.exists = exists;
+      this.isDirectory = isDirectory;
+      this.isFile = isFile;
+      this.lastModified = lastModified;
+    }
+  }
+
+  /**
+   * Reads from a file.
+   * @param path File path.
+   * @return File's content as string
+   */
+  public abstract String read(String path);
+
+  /**
+   * Writes to a file.
+   * @param path File path.
+   * @param data File data to write.
+   */
+  public abstract void write(String path, String data);
+
+  /**
+   * Moves a file (i.e.\ renames it).
+   * @param fromPath Current path to the file.
+   * @param toPath New path to the file.
+   */
+  public abstract void move(String fromPath, String toPath);
+
+  /**
+   * Removes a file.
+   * @param path File path.
+   */
+  public abstract void remove(String path);
+
+  /**
+   * Retrieves information about a file.
+   * @param path File path.
+   * @return File information.
+   */
+  public abstract StatResult stat(String path);
+
+  /**
+   * Returns the absolute path to a file.
+   * @param path File path (can be relative or absolute).
+   * @return Absolute file path.
+   */
+  public abstract String resolve(String path);
+
+  @Override
+  public void dispose()
+  {
+    this.disposer.dispose();
+  }
+
+  private final static class DisposeWrapper implements Disposable
+  {
+    private final long ptr;
+
+    public DisposeWrapper(final long ptr)
+    {
+      this.ptr = ptr;
+    }
+
+    @Override
+    public void dispose()
+    {
+      dtor(this.ptr);
+    }
+  }
+
+  private final static native void registerNatives();
+
+  private final static native long ctor(Object callbackObject);
+
+  private final static native void dtor(long ptr);
+}