widget/android/jni/Conversions.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "Conversions.h"
   8 #include "JavaBuiltins.h"
   9
  10 #include "mozilla/ipc/GeckoChildProcessHost.h"
  11
  12 namespace mozilla {
  13 namespace jni {
  14
  15 template <class T>
  16 jfieldID GetValueFieldID(JNIEnv* aEnv, const char* aType) {
  17   const jfieldID id = aEnv->GetFieldID(
  18       typename T::Context(aEnv, nullptr).ClassRef(), "value", aType);
  19   aEnv->ExceptionClear();
  20   return id;
  21 }
  22
  23 // Cached locations of the primitive types within their standard boxed objects
  24 // to skip doing that lookup on every get.
  25 static jfieldID gBooleanValueField;
  26 static jfieldID gIntValueField;
  27 static jfieldID gDoubleValueField;
  28
  29 void InitConversionStatics() {
  30   MOZ_ASSERT(NS_IsMainThread());
  31   JNIEnv* const env = jni::GetGeckoThreadEnv();
  32   gBooleanValueField = GetValueFieldID<java::sdk::Boolean>(env, "Z");
  33   gIntValueField = GetValueFieldID<java::sdk::Integer>(env, "I");
  34   gDoubleValueField = GetValueFieldID<java::sdk::Double>(env, "D");
  35 }
  36
  37 template <>
  38 bool Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
  39   MOZ_ASSERT(aData.IsInstanceOf<jni::Boolean>());
  40
  41   bool result = false;
  42   if (gBooleanValueField) {
  43     if (!aEnv) {
  44       aEnv = jni::GetEnvForThread();
  45     }
  46     result =
  47         aEnv->GetBooleanField(aData.Get(), gBooleanValueField) != JNI_FALSE;
  48     MOZ_CATCH_JNI_EXCEPTION(aEnv);
  49   } else {
  50     result = java::sdk::Boolean::Ref::From(aData)->BooleanValue();
  51   }
  52
  53   return result;
  54 }
  55
  56 template <>
  57 int Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
  58   MOZ_ASSERT(aData.IsInstanceOf<jni::Integer>());
  59
  60   int result = 0;
  61   if (gIntValueField) {
  62     if (!aEnv) {
  63       aEnv = jni::GetEnvForThread();
  64     }
  65     result = aEnv->GetIntField(aData.Get(), gIntValueField);
  66     MOZ_CATCH_JNI_EXCEPTION(aEnv);
  67   } else {
  68     result = java::sdk::Number::Ref::From(aData)->IntValue();
  69   }
  70
  71   return result;
  72 }
  73
  74 template <>
  75 double Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
  76   MOZ_ASSERT(aData.IsInstanceOf<jni::Double>());
  77
  78   double result = 0;
  79   if (gDoubleValueField) {
  80     if (!aEnv) {
  81       aEnv = jni::GetEnvForThread();
  82     }
  83     result = aEnv->GetDoubleField(aData.Get(), gDoubleValueField);
  84     MOZ_CATCH_JNI_EXCEPTION(aEnv);
  85   } else {
  86     result = java::sdk::Number::Ref::From(aData)->DoubleValue();
  87   }
  88
  89   return result;
  90 }
  91
  92 template <>
  93 ipc::LaunchError Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
  94   return ipc::LaunchError{};
  95 }
  96
  97 template <>
  98 nsString Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
  99   nsString result;
 100   if (aData != NULL && aData.IsInstanceOf<jni::String>()) {
 101     result = jni::String::Ref::From(aData)->ToString();
 102   }
 103   return result;
 104 }
 105
 106 template <>
 107 nsresult Java2Native(mozilla::jni::Object::Param aData, JNIEnv* aEnv) {
 108   MOZ_ASSERT(aData.IsInstanceOf<jni::Throwable>());
 109   return NS_ERROR_FAILURE;
 110 }
 111
 112 }  // namespace jni
 113 }  // namespace mozilla