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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_BOUND_OBJECT_H_
      6 #define CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_BOUND_OBJECT_H_
      7 
      8 #include <map>
      9 #include <set>
     10 
     11 #include "base/android/jni_weak_ref.h"
     12 #include "base/android/scoped_java_ref.h"
     13 #include "base/memory/linked_ptr.h"
     14 #include "base/memory/ref_counted.h"
     15 #include "base/values.h"
     16 #include "content/browser/android/java/java_method.h"
     17 
     18 namespace content {
     19 
     20 class GinJavaBoundObject
     21     : public base::RefCountedThreadSafe<GinJavaBoundObject> {
     22  public:
     23   typedef int32 ObjectID;
     24 
     25   static GinJavaBoundObject* CreateNamed(
     26       const JavaObjectWeakGlobalRef& ref,
     27       const base::android::JavaRef<jclass>& safe_annotation_clazz);
     28   static GinJavaBoundObject* CreateTransient(
     29       const JavaObjectWeakGlobalRef& ref,
     30       const base::android::JavaRef<jclass>& safe_annotation_clazz,
     31       int32 holder);
     32 
     33   // The following methods can be called on any thread.
     34   JavaObjectWeakGlobalRef& GetWeakRef() { return ref_; }
     35   base::android::ScopedJavaLocalRef<jobject> GetLocalRef(JNIEnv* env) {
     36     return ref_.get(env);
     37   }
     38 
     39   bool IsNamed() { return names_count_ > 0; }
     40   void AddName() { ++names_count_; }
     41   void RemoveName() { --names_count_; }
     42 
     43   bool HasHolders() { return !holders_.empty(); }
     44   void AddHolder(int32 holder) { holders_.insert(holder); }
     45   void RemoveHolder(int32 holder) { holders_.erase(holder); }
     46 
     47   // The following methods are called on the background thread.
     48   std::set<std::string> GetMethodNames();
     49   bool HasMethod(const std::string& method_name);
     50   const JavaMethod* FindMethod(const std::string& method_name,
     51                                size_t num_parameters);
     52   bool IsObjectGetClassMethod(const JavaMethod* method);
     53   const base::android::JavaRef<jclass>& GetSafeAnnotationClass();
     54   base::android::ScopedJavaLocalRef<jclass> GetLocalClassRef(JNIEnv* env);
     55 
     56  private:
     57   friend class base::RefCountedThreadSafe<GinJavaBoundObject>;
     58 
     59   GinJavaBoundObject(
     60       const JavaObjectWeakGlobalRef& ref,
     61       const base::android::JavaRef<jclass>& safe_annotation_clazz);
     62   GinJavaBoundObject(
     63       const JavaObjectWeakGlobalRef& ref,
     64       const base::android::JavaRef<jclass>& safe_annotation_clazz,
     65       const std::set<int32>& holders);
     66   ~GinJavaBoundObject();
     67 
     68   // The following methods are called on the background thread.
     69   void EnsureMethodsAreSetUp();
     70 
     71   JavaObjectWeakGlobalRef ref_;
     72 
     73   // An object must be kept in retained_object_set_ either if it has
     74   // names or if it has a non-empty holders set.
     75   int names_count_;
     76   std::set<int32> holders_;
     77 
     78   // The following fields are accessed on the background thread.
     79   typedef std::multimap<std::string, linked_ptr<JavaMethod> > JavaMethodMap;
     80   JavaMethodMap methods_;
     81   jmethodID object_get_class_method_id_;
     82   bool are_methods_set_up_;
     83   base::android::ScopedJavaGlobalRef<jclass> safe_annotation_clazz_;
     84 };
     85 
     86 }  // namespace content
     87 
     88 #endif  // CONTENT_BROWSER_ANDROID_JAVA_GIN_JAVA_BOUND_OBJECT_H_
     89