Move talk/app/webrtc to webrtc/api

talk/app/webrtc/java/jni/jni_helpers.h

-/*
- * libjingle
- * Copyright 2015 Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-// This file contain convenience functions and classes for JNI.
-// Before using any of the methods, InitGlobalJniVariables must be called.
-
-#ifndef TALK_APP_WEBRTC_JAVA_JNI_JNI_HELPERS_H_
-#define TALK_APP_WEBRTC_JAVA_JNI_JNI_HELPERS_H_
-
-#include <jni.h>
-#include <string>
-
-#include "webrtc/base/checks.h"
-
-// Abort the process if |jni| has a Java exception pending.
-// This macros uses the comma operator to execute ExceptionDescribe
-// and ExceptionClear ignoring their return values and sending ""
-// to the error stream.
-#define CHECK_EXCEPTION(jni)        \
-  RTC_CHECK(!jni->ExceptionCheck()) \
-      << (jni->ExceptionDescribe(), jni->ExceptionClear(), "")
-
-// Helper that calls ptr->Release() and aborts the process with a useful
-// message if that didn't actually delete *ptr because of extra refcounts.
-#define CHECK_RELEASE(ptr) \
-  RTC_CHECK_EQ(0, (ptr)->Release()) << "Unexpected refcount."
-
-namespace webrtc_jni {
-
-jint InitGlobalJniVariables(JavaVM *jvm);
-
-// Return a |JNIEnv*| usable on this thread or NULL if this thread is detached.
-JNIEnv* GetEnv();
-
-JavaVM *GetJVM();
-
-// Return a |JNIEnv*| usable on this thread.  Attaches to |g_jvm| if necessary.
-JNIEnv* AttachCurrentThreadIfNeeded();
-
-// Return a |jlong| that will correctly convert back to |ptr|.  This is needed
-// because the alternative (of silently passing a 32-bit pointer to a vararg
-// function expecting a 64-bit param) picks up garbage in the high 32 bits.
-jlong jlongFromPointer(void* ptr);
-
-// JNIEnv-helper methods that RTC_CHECK success: no Java exception thrown and
-// found object/class/method/field is non-null.
-jmethodID GetMethodID(
-    JNIEnv* jni, jclass c, const std::string& name, const char* signature);
-
-jmethodID GetStaticMethodID(
-    JNIEnv* jni, jclass c, const char* name, const char* signature);
-
-jfieldID GetFieldID(JNIEnv* jni, jclass c, const char* name,
-                    const char* signature);
-
-jclass GetObjectClass(JNIEnv* jni, jobject object);
-
-jobject GetObjectField(JNIEnv* jni, jobject object, jfieldID id);
-
-jstring GetStringField(JNIEnv* jni, jobject object, jfieldID id);
-
-jlong GetLongField(JNIEnv* jni, jobject object, jfieldID id);
-
-jint GetIntField(JNIEnv* jni, jobject object, jfieldID id);
-
-bool GetBooleanField(JNIEnv* jni, jobject object, jfieldID id);
-
-// Java references to "null" can only be distinguished as such in C++ by
-// creating a local reference, so this helper wraps that logic.
-bool IsNull(JNIEnv* jni, jobject obj);
-
-// Given a UTF-8 encoded |native| string return a new (UTF-16) jstring.
-jstring JavaStringFromStdString(JNIEnv* jni, const std::string& native);
-
-// Given a (UTF-16) jstring return a new UTF-8 native string.
-std::string JavaToStdString(JNIEnv* jni, const jstring& j_string);
-
-// Return the (singleton) Java Enum object corresponding to |index|;
-jobject JavaEnumFromIndex(JNIEnv* jni, jclass state_class,
-                          const std::string& state_class_name, int index);
-
-// Returns the name of a Java enum.
-std::string GetJavaEnumName(JNIEnv* jni,
-                            const std::string& className,
-                            jobject j_enum);
-
-jobject NewGlobalRef(JNIEnv* jni, jobject o);
-
-void DeleteGlobalRef(JNIEnv* jni, jobject o);
-
-// Scope Java local references to the lifetime of this object.  Use in all C++
-// callbacks (i.e. entry points that don't originate in a Java callstack
-// through a "native" method call).
-class ScopedLocalRefFrame {
- public:
-  explicit ScopedLocalRefFrame(JNIEnv* jni);
-  ~ScopedLocalRefFrame();
-
- private:
-  JNIEnv* jni_;
-};
-
-// Scoped holder for global Java refs.
-template<class T>  // T is jclass, jobject, jintArray, etc.
-class ScopedGlobalRef {
- public:
-  ScopedGlobalRef(JNIEnv* jni, T obj)
-      : obj_(static_cast<T>(jni->NewGlobalRef(obj))) {}
-  ~ScopedGlobalRef() {
-    DeleteGlobalRef(AttachCurrentThreadIfNeeded(), obj_);
-  }
-  T operator*() const {
-    return obj_;
-  }
- private:
-  T obj_;
-};
-
-}  // namespace webrtc_jni
-
-#endif  // TALK_APP_WEBRTC_JAVA_JNI_JNI_HELPERS_H_