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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_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_
      6 #define CONTENT_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "base/pickle.h"
     10 #include "base/values.h"
     11 #include "content/common/content_export.h"
     12 
     13 // In Java Bridge, we need to pass some kinds of values that can't
     14 // be put into base::Value. And since base::Value is not extensible,
     15 // we transfer these special values via base::BinaryValue.
     16 
     17 namespace content {
     18 
     19 class GinJavaBridgeValue {
     20  public:
     21   enum Type {
     22     TYPE_FIRST_VALUE = 0,
     23     // JavaScript 'undefined'
     24     TYPE_UNDEFINED = 0,
     25     // JavaScript NaN and Infinity
     26     TYPE_NONFINITE,
     27     // Bridge Object ID
     28     TYPE_OBJECT_ID,
     29     TYPE_LAST_VALUE
     30   };
     31 
     32   // Serialization
     33   CONTENT_EXPORT static scoped_ptr<base::BinaryValue> CreateUndefinedValue();
     34   CONTENT_EXPORT static scoped_ptr<base::BinaryValue> CreateNonFiniteValue(
     35       float in_value);
     36   CONTENT_EXPORT static scoped_ptr<base::BinaryValue> CreateNonFiniteValue(
     37       double in_value);
     38   CONTENT_EXPORT static scoped_ptr<base::BinaryValue> CreateObjectIDValue(
     39       int32 in_value);
     40 
     41   // De-serialization
     42   CONTENT_EXPORT static bool ContainsGinJavaBridgeValue(
     43       const base::Value* value);
     44   CONTENT_EXPORT static scoped_ptr<const GinJavaBridgeValue> FromValue(
     45       const base::Value* value);
     46 
     47   CONTENT_EXPORT Type GetType() const;
     48   CONTENT_EXPORT bool IsType(Type type) const;
     49 
     50   CONTENT_EXPORT bool GetAsNonFinite(float* out_value) const;
     51   CONTENT_EXPORT bool GetAsObjectID(int32* out_object_id) const;
     52 
     53  private:
     54   explicit GinJavaBridgeValue(Type type);
     55   explicit GinJavaBridgeValue(const base::BinaryValue* value);
     56   base::BinaryValue* SerializeToBinaryValue();
     57 
     58   Pickle pickle_;
     59 
     60   DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeValue);
     61 };
     62 
     63 }  // namespace content
     64 
     65 #endif  // CONTENT_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_
     66