Add JavaBoundObject

base/android/jni_android.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_ANDROID_JNI_ANDROID_H_
 #define BASE_ANDROID_JNI_ANDROID_H_
 
 #include <jni.h>
 #include <sys/types.h>
 
@@ skipping 12 matching lines @@
 
 // Initializes the global application context object. The |context| should be
 // the global reference of application context object.  It is not necessarily
 // called after InitVM().
 // TODO: We might combine InitVM() and InitApplicationContext() into one method.
 void InitApplicationContext(jobject context);
 
 // Returns the application context assigned by InitApplicationContext().
 jobject GetApplicationContext();
 
+// Wraps a method ID.
+class MethodID {
+ public:
+  jmethodID id() { return id_; }
+ protected:
+  // Gets the method ID from the class name. Clears the pending Java exception
+  // and returns NULL if the method is not found. Note that GetMethodID() below
+  // avoids a class lookup, so should be used in preference when possible.
+  MethodID(JNIEnv* env, const char* class_name, const char* method,
+           const char* jni_signature);
+ private:
+  jmethodID id_;
+};
+
 // Get the method ID for a method. Will clear the pending Java
 // exception and return 0 if the method is not found.
 jmethodID GetMethodID(JNIEnv* env,
                       jclass clazz,
                       const char* const method,
                       const char* const jni_signature);
 
 // Get the method ID for a class static method. Will clear the pending Java
 // exception and return 0 if the method is not found.
 jmethodID GetStaticMethodID(JNIEnv* env,
                             jclass clazz,
                             const char* const method,
                             const char* const jni_signature);
 
-// Returns true if an exception is pending in the provided JNIEnv*.
-// If an exception is pending, it is printed.
+// Gets the field ID for a class field. Clears the pending Java exception and
+// returns NULL if the field is not found.
+jfieldID GetFieldID(JNIEnv* env,
+                    jclass clazz,
+                    const char* field,
+                    const char* jni_signature);
+
+// Returns true if an exception is pending in the provided JNIEnv*. If an
+// exception is pending, this function prints and then clears it.
 bool CheckException(JNIEnv* env);
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_JNI_ANDROID_H_