Issue 4399 - Add WebView inheritor with ad blocking

libadblockplus-android-webview/src/org/adblockplus/android/ReflectionUtils.java

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 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.android;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+public class ReflectionUtils
+{
+  public static Object extractProperty(Object target, String field)
+  {
+    return extractProperty(target, target.getClass(), field);
+  }
+
+  public static Object extractProperty(Object target, Class clazz, String field)
+  {
+    try
+    {
+      Field f = clazz.getDeclaredField(field);
+      if (!f.isAccessible())
+      {
+        f.setAccessible(true);
+      }
+      return f.get(target);
+    }
+    catch (NoSuchFieldException e)
+    {
+      return extractProperty(target, clazz.getSuperclass(), field);
+    }
+    catch (Exception e)
+    {
+      return null;
+    }
+  }
+
+  public static Object extractProperty(Object target, String []fields)
+  {
+    Object eachTarget = target;
+    for (int i = 0; i < fields.length; i++)
+    {
+      eachTarget = extractProperty(eachTarget, eachTarget.getClass(), fields[i]);
+      if (eachTarget == null)
+      {
+        return null;
+      }
+    }
+    return eachTarget;
+  }
+
+  public static boolean injectProperty(Object target, String field, Object value)
+  {
+    try
+    {
+      Field f = target.getClass().getDeclaredField(field);
+      if (!f.isAccessible())
+      {
+        f.setAccessible(true);
+      }
+      f.set(target, value);
+      return true;
+    }
+    catch (Exception e)
+    {
+      return false;
+    }
+  }
+
+  public static boolean invokeMethod(Object target, String methodName, Object[] args)
+  {
+    Method[] methods = target.getClass().getDeclaredMethods();
+    for (Method eachMethod : methods)
+    {
+      if (eachMethod.getName().equals(methodName))
+      {
+        try
+        {
+          if (!eachMethod.isAccessible())
+          {
+            eachMethod.setAccessible(true);
+          }
+          eachMethod.invoke(target, args);
+          return true;
+        }
+        catch (Exception e)
+        {
+          return false;
+        }
+      }
+    }
+    return false;
+  }
+}