content/common/android/gin_java_bridge_value.h

   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_