Revert of Combine webrtc/api/java/android and webrtc/api/java/src.

webrtc/api/android/jni/jni_helpers.h

-/*
- *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-// This file contain convenience functions and classes for JNI.
-// Before using any of the methods, InitGlobalJniVariables must be called.
-
-#ifndef WEBRTC_API_JAVA_JNI_JNI_HELPERS_H_
-#define WEBRTC_API_JAVA_JNI_JNI_HELPERS_H_
-
-#include <jni.h>
-#include <string>
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/base/checks.h"
-#include "webrtc/base/thread_checker.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);
-
-// Throws an exception if the object field is null.
-jobject GetObjectField(JNIEnv* jni, jobject object, jfieldID id);
-
-jobject GetNullableObjectField(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);
-
-// Returns true if |obj| == null in Java.
-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_;
-};
-
-// Provides a convenient way to iterate over a Java Iterable using the
-// C++ range-for loop.
-// E.g. for (jobject value : Iterable(jni, j_iterable)) { ... }
-// Note: Since Java iterators cannot be duplicated, the iterator class is not
-// copyable to prevent creating multiple C++ iterators that refer to the same
-// Java iterator.
-class Iterable {
- public:
-  Iterable(JNIEnv* jni, jobject iterable) : jni_(jni), iterable_(iterable) {}
-
-  class Iterator {
-   public:
-    // Creates an iterator representing the end of any collection.
-    Iterator();
-    // Creates an iterator pointing to the beginning of the specified
-    // collection.
-    Iterator(JNIEnv* jni, jobject iterable);
-
-    // Move constructor - necessary to be able to return iterator types from
-    // functions.
-    Iterator(Iterator&& other);
-
-    // Move assignment should not be used.
-    Iterator& operator=(Iterator&&) = delete;
-
-    // Advances the iterator one step.
-    Iterator& operator++();
-
-    // Provides a way to compare the iterator with itself and with the end
-    // iterator.
-    // Note: all other comparison results are undefined, just like for C++ input
-    // iterators.
-    bool operator==(const Iterator& other);
-    bool operator!=(const Iterator& other) { return !(*this == other); }
-    jobject operator*();
-
-   private:
-    bool AtEnd() const;
-
-    JNIEnv* jni_ = nullptr;
-    jobject iterator_ = nullptr;
-    jobject value_ = nullptr;
-    jmethodID has_next_id_ = nullptr;
-    jmethodID next_id_ = nullptr;
-    rtc::ThreadChecker thread_checker_;
-
-    RTC_DISALLOW_COPY_AND_ASSIGN(Iterator);
-  };
-
-  Iterable::Iterator begin() { return Iterable::Iterator(jni_, iterable_); }
-  Iterable::Iterator end() { return Iterable::Iterator(); }
-
- private:
-  JNIEnv* jni_;
-  jobject iterable_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(Iterable);
-};
-
-}  // namespace webrtc_jni
-
-#endif  // WEBRTC_API_JAVA_JNI_JNI_HELPERS_H_