1 files changed, 64 insertions, 0 deletions
diff --git a/java/com/android/dialer/oem/SystemPropertiesAccessor.java b/java/com/android/dialer/oem/SystemPropertiesAccessor.java
new file mode 100644
index 000000000..122bbfe6c
--- /dev/null
+++ b/java/com/android/dialer/oem/SystemPropertiesAccessor.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.dialer.oem;
+
+import android.support.annotation.Nullable;
+import com.android.dialer.common.LogUtil;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/**
+ * Hacky way to call the hidden SystemProperties class API. Needed to get the real value of
+ * ro.carrier and some other values.
+ */
+class SystemPropertiesAccessor {
+  private Method systemPropertiesGetMethod;
+
+  @SuppressWarnings("PrivateApi")
+  public String get(String name) {
+    Method systemPropertiesGetMethod = getSystemPropertiesGetMethod();
+    if (systemPropertiesGetMethod == null) {
+      return null;
+    }
+
+    try {
+      return (String) systemPropertiesGetMethod.invoke(null, name);
+    } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
+      LogUtil.e("SystemPropertiesAccessor.get", "unable to invoke system method", e);
+      return null;
+    }
+  }
+
+  @SuppressWarnings("PrivateApi")
+  private @Nullable Method getSystemPropertiesGetMethod() {
+    if (systemPropertiesGetMethod != null) {
+      return systemPropertiesGetMethod;
+    }
+
+    try {
+      Class<?> systemPropertiesClass = Class.forName("android.os.SystemProperties");
+      if (systemPropertiesClass == null) {
+        return null;
+      }
+      systemPropertiesGetMethod = systemPropertiesClass.getMethod("get", String.class);
+      return systemPropertiesGetMethod;
+    } catch (ClassNotFoundException | NoSuchMethodException e) {
+      LogUtil.e("SystemPropertiesAccessor.get", "unable to access system class", e);
+      return null;
+    }
+  }
+}