java4cpp/examples/simple/simple0.cpp at java4cpp-1.0 · wshackle/java4cpp · GitHub

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#include <jni.h>

#include <cstdlib>

#include <iostream>

#include <string>

#include "simple.h"

namespace simple {

JNIEnv *getEnv();

static bool debug_j4cpp = false;

namespace java {

namespace lang {

Object::Object() {

jthis = NULL;

};

Object::Object(const Object &objref) {

jobject _jthis = objref.jthis;

if (_jthis != NULL) {

jthis = getEnv()->NewGlobalRef(_jthis);

}

};

Object::Object(jobject _jthis, bool copy) {

// std::cout << "_jthis = " << _jthis << std::endl;

jthis = NULL;

if (_jthis != NULL) {

JNIEnv *env = getEnv();

jobjectRefType ref0 = env->GetObjectRefType(jthis);

if (copy || ref0 != JNIGlobalRefType) {

jthis = env->NewGlobalRef(_jthis);

}

};

Object & Object::operator =(const Object &otherobject) {

jobject oldjthis = jthis;

jobject _newjthis = otherobject.jthis;

jobject newjthis= NULL;

jthis= NULL;

JNIEnv *env = getEnv();

if (_newjthis != NULL) {

if(debug_j4cpp) DebugPrintJObject(__FILE__,__LINE__,"Object::operator= called for _newjthis=",_newjthis);

newjthis = env->NewGlobalRef(_newjthis);

}

if (NULL != oldjthis) {

if(debug_j4cpp) DebugPrintJObject(__FILE__,__LINE__,"Object::operator= called for oldjthis=",oldjthis);

env->DeleteGlobalRef(oldjthis);

oldjthis = NULL;

}

jthis=newjthis;

releaseEnv(env);

return *this;

}

Object::~Object() {

if (NULL != jthis) {

if(debug_j4cpp) DebugPrintJObject(__FILE__,__LINE__,"Destructor called for ",jthis);

getEnv()->DeleteGlobalRef(jthis);

jthis = NULL;

}

};

jstring Object::toString() {

if (jthis == NULL) {

std::cerr << "Call of method toString of java.lang.Object with jthis == NULL." << std::endl;

return NULL;

}

JNIEnv *env = getEnv();

jobjectRefType ref0 = env->GetObjectRefType(jthis);

if(debug_j4cpp) DebugPrintJObject(__FILE__,__LINE__," Object::toString() jthis=",jthis);

jclass cls = env->GetObjectClass(jthis);

jstring retVal = NULL;

if (cls != NULL) {

jmethodID mid = env->GetMethodID(cls, "toString", "()Ljava/lang/String;");

if (NULL == mid) {

std::cerr << "Class ava.lang.Object has no method named toString with signature ()Ljava/lang/String;." << std::endl;

return NULL;

} else {

retVal = (jstring) env->CallObjectMethod(jthis, mid);

}

return retVal;

}

// get JNI handle for class Simple

static inline jclass getSimpleClass();

Simple::Simple(jobject _jthis, bool copy): java::lang::Object(_jthis,copy) {

// Place holder for future extensibility

}

Simple::Simple(const Simple &objref): java::lang::Object((jobject)NULL,false) {

jobject _jthis = objref.jthis;

if(GetDebugJ4Cpp()) DebugPrintJObject(__FILE__,__LINE__,"Copy Constructor for class Simple _jthis=",_jthis);

if (_jthis != NULL) {

jthis = getEnv()->NewGlobalRef(_jthis);

if(GetDebugJ4Cpp()) DebugPrintJObject(__FILE__,__LINE__,"Copy Constructor for class Simple jthis=",jthis);

}

Simple Simple::cast(const java::lang::Object &objref) {

JNIEnv *env =getEnv();

static jclass cls = getSimpleClass();

jclass objcls = env->GetObjectClass(objref.jthis);

if(!env->IsAssignableFrom(objcls,cls)) {

throw objcls;

}

Simple retVal(objref.jthis,true);

return retVal;

}

Simple::Simple() : java::lang::Object((jobject)NULL,false) {

JNIEnv *env =getEnv();

static jclass cls = getSimpleClass();

if (cls != NULL) {

static jmethodID mid = env->GetMethodID(cls, "<init>", "()V");

if (NULL == mid) {

std::cerr << "Class Simple has no method constructor signature ()V" << std::endl;

} else {

jthis = env->NewObject(cls, mid );

jthrowable t = env->ExceptionOccurred();

if(t != NULL) {

if(GetDebugJ4Cpp()) {

DebugPrintJObject(__FILE__,__LINE__," Simple::%METHOD_NAME% jthis=",t);

env->ExceptionDescribe();

}

throw t;

}

if(jthis == NULL) {

std::cerr << "Call to create new Simple with signature ()V returned null." << std::endl;

releaseEnv(env);

return;

}

jobjectRefType ref = env->GetObjectRefType(jthis);

if(GetDebugJ4Cpp()) DebugPrintJObject(__FILE__,__LINE__," new Simple jthis=",jthis);

if(ref != JNIGlobalRefType) {

jthis = env->NewGlobalRef(jthis);

}

releaseEnv(env);

}

Simple::Simple(jint int_0) : java::lang::Object((jobject)NULL,false) {

JNIEnv *env =getEnv();

static jclass cls = getSimpleClass();

if (cls != NULL) {

static jmethodID mid = env->GetMethodID(cls, "<init>", "(I)V");

if (NULL == mid) {

std::cerr << "Class Simple has no method constructor signature (I)V" << std::endl;

} else {

jthis = env->NewObject(cls, mid ,int_0);

jthrowable t = env->ExceptionOccurred();

if(t != NULL) {

if(GetDebugJ4Cpp()) {

DebugPrintJObject(__FILE__,__LINE__," Simple::%METHOD_NAME% jthis=",t);

env->ExceptionDescribe();

}

throw t;

}

if(jthis == NULL) {

std::cerr << "Call to create new Simple with signature (I)V returned null." << std::endl;

releaseEnv(env);

return;

}

jobjectRefType ref = env->GetObjectRefType(jthis);

if(GetDebugJ4Cpp()) DebugPrintJObject(__FILE__,__LINE__," new Simple jthis=",jthis);

if(ref != JNIGlobalRefType) {

jthis = env->NewGlobalRef(jthis);

}

releaseEnv(env);

}

// Destructor for Simple

Simple::~Simple() {

// Place-holder for later extensibility.

}

jint Simple::getValue() {

if(jthis == NULL) {

std::cerr << __FILE__ << ":" << __LINE__ <<" Call of method getValue of Simple with jthis == NULL." << std::endl;

return (jint) -1;

}

JNIEnv *env =getEnv();

jclass cls = env->GetObjectClass(jthis);

if(GetDebugJ4Cpp()) DebugPrintJObject(__FILE__,__LINE__," Simple::getValue jthis=",jthis);

jint retVal= (jint) -1;

if (cls != NULL) {

static jmethodID mid = env->GetMethodID(cls, "getValue", "()I");

if (NULL == mid) {

DebugPrintJObject(__FILE__,__LINE__," Simple::getValue jthis=",jthis);

std::cerr << __FILE__ << ":" << __LINE__ << " Class Simple has no method named getValue with signature ()I." << std::endl;

return (jint) -1;

} else {

retVal= (jint) env->CallIntMethod(jthis, mid );

jthrowable t = env->ExceptionOccurred();

if(t != NULL) {

if(GetDebugJ4Cpp()) {

DebugPrintJObject(__FILE__,__LINE__," Simple::getValue jthrowable t=",t);

env->ExceptionDescribe();

}

// env->ExceptionClear();

throw t;

}

releaseEnv(env);

return retVal;

}

static jclass getNewSimpleClass() {

jclass clss = getEnv()->FindClass("Simple");

if (NULL == clss) {

std::cerr << " Can't find class Simple" << std::endl;

}

return clss;

}

static jclass SimpleClass = NULL;

static inline jclass getSimpleClass() {

if (SimpleClass != NULL) {

return SimpleClass;

}

SimpleClass = getNewSimpleClass();

return SimpleClass;

}

static JNIEnv *getNewEnv() {

JavaVM *jvm; /* denotes a Java VM */

JNIEnv *env; /* pointer to native method interface */

JavaVM * jvmBuf[1];

jsize nVMs;

char *debugJ4CppEnv = NULL;

char *classPathEnv = NULL;

char *jvmOptionsEnv = NULL;

#if defined(_WIN32) || defined(_WIN64)

errno_t errno_val;

size_t requiredSize;

errno_val = getenv_s( &requiredSize, NULL, 0, "DEBUG_J4CPP");

if(requiredSize > 0) {

debugJ4CppEnv = (char *) malloc(requiredSize);

errno_val = getenv_s( &requiredSize, debugJ4CppEnv, requiredSize, "DEBUG_J4CPP");

}

errno_val = getenv_s( &requiredSize, NULL, 0, "CLASSPATH");

if(requiredSize > 0) {

classPathEnv = (char *) malloc(requiredSize);

errno_val = getenv_s( &requiredSize, classPathEnv, requiredSize, "CLASSPATH");

}

errno_val = getenv_s( &requiredSize, NULL, 0, "JVM_OPTIONS");

if(requiredSize > 0) {

jvmOptionsEnv = (char *) malloc(requiredSize);

errno_val = getenv_s( &requiredSize, jvmOptionsEnv, requiredSize, "JVM_OPTIONS");

}

#else

debugJ4CppEnv = getenv("DEBUG_J4CPP");

classPathEnv = getenv("CLASSPATH");

jvmOptionsEnv = getenv("JVM_OPTIONS");

#endif

debug_j4cpp = debug_j4cpp || (debugJ4CppEnv != NULL && debugJ4CppEnv[0] != 0);

std::string str;

str += "/home/shackle/java4cpp/examples/simple";

if (classPathEnv != NULL) {

std::string classPathEnvStr(classPathEnv);

if (debug_j4cpp) std::cout << "classPathEnv=" << classPathEnvStr << std::endl;

str += ":";

str += classPathEnvStr;

}

if (debug_j4cpp) std::cout << "str=" << str << std::endl;

#if defined(_WIN32) || defined(_WIN64)

_putenv_s("CLASSPATH", str.c_str());

#else

setenv("CLASSPATH", str.c_str(), 1);

#endif

std::string optsString;

optsString += "-Djava.class.path=";

optsString += str;

if (jvmOptionsEnv != NULL) {

std::string jvmOptionsEnvStr(jvmOptionsEnv);

if (debug_j4cpp) std::cout << "jvmOptionsEnvStr=" << jvmOptionsEnvStr << std::endl;

optsString += " ";

optsString += jvmOptionsEnvStr;

}

if (debug_j4cpp) std::cout << "optsString=" << optsString << std::endl;

jint v = JNI_GetCreatedJavaVMs(jvmBuf, 1, &nVMs);

if (nVMs > 0) {

jvmBuf[0]->GetEnv((void **) &env, JNI_VERSION_1_6);

return env;

}

JavaVMInitArgs vm_args; /* JDK/JRE 6 VM initialization arguments */

JavaVMOption* options = new JavaVMOption[1];

options[0].optionString = (char *) optsString.c_str();

vm_args.version = JNI_VERSION_1_6;

vm_args.nOptions = NULL != options[0].optionString ? 1 : 0;

vm_args.options = options;

vm_args.ignoreUnrecognized = false;

/* load and initialize a Java VM, return a JNI interface

* pointer in env */

JNI_CreateJavaVM(&jvm,

((void **) (&env)),

((void *) (&vm_args)));

delete options;

#if defined(_WIN32) || defined(_WIN64)

if(debugJ4CppEnv != NULL) {

free(debugJ4CppEnv);

debugJ4CppEnv = NULL;

}

if(classPathEnv != NULL) {

free(classPathEnv);

classPathEnv = NULL;

}

if(jvmOptionsEnv != NULL) {

free(jvmOptionsEnv);

jvmOptionsEnv = NULL;

}

#endif

return env;

}

static JNIEnv *env = NULL;

JNIEnv *getEnv() {

if (env != NULL) {

return env;

}

env = getNewEnv();

return env;

}

void releaseEnv(JNIEnv *env) {

// Maybe implement this later,

// This will probably cause a memory leak.

// Don't like leaks? Why the hell are using C++?

}

static jclass getNewStringClass() {

jclass clss = getEnv()->FindClass("java/lang/String");

if (NULL == clss) {

std::cerr << " Can't find class java/lang/String" << std::endl;

}

return clss;

}

static jclass StringClass = NULL;

jclass getStringClass() {

if (StringClass != NULL) {

return StringClass;

}

StringClass = getNewStringClass();

return StringClass;

}

static jclass getNewClassClass() {

jclass clss = getEnv()->FindClass("java/lang/Class");

if (NULL == clss) {

std::cerr << " Can't find class java/lang/Class" << std::endl;

}

return clss;

}

static jclass ClassClass = NULL;

jclass getClassClass() {

if (ClassClass != NULL) {

return ClassClass;

}

ClassClass = getNewStringClass();

return ClassClass;

}

static jstring getNewEmptyString() {

return getEnv()->NewStringUTF("");

}

static jstring EmptyString = NULL;

jstring getEmptyString() {

if (EmptyString != NULL) {

return EmptyString;

}

EmptyString = getNewEmptyString();

return EmptyString;

}

void PrintJObject(const char *prefix, jobject jobj) {

if(NULL == jobj) {

std::cout << prefix << "NULL" << std::endl;

return;

}

JNIEnv *env = getEnv();

jclass clss = env->GetObjectClass(jobj);

jmethodID midToString = env->GetMethodID(clss, "toString", "()Ljava/lang/String;");

jstring jobjstr = (jstring) env->CallObjectMethod(jobj, midToString);

jboolean iscopy = JNI_FALSE;

const char *cstr = env->GetStringUTFChars(jobjstr, &iscopy);

std::cout << prefix << cstr << std::endl;

env->ReleaseStringUTFChars(jobjstr,cstr);

}

void PrintJThrowable(const char *prefix, jthrowable jobj) {

JNIEnv *env = getEnv();

jclass clss = env->GetObjectClass(jobj);

jmethodID midToString = env->GetMethodID(clss, "toString", "()Ljava/lang/String;");

jstring jobjstr = (jstring) env->CallObjectMethod(jobj, midToString);

jboolean iscopy = JNI_FALSE;

const char *cstr = env->GetStringUTFChars(jobjstr, &iscopy);

std::cerr << prefix << cstr << std::endl;

env->ReleaseStringUTFChars(jobjstr,cstr);

env->ExceptionDescribe();

env->ExceptionClear();

}

void DebugPrintJObject(const char *file, int lineno, const char *prefix, jobject jobj) {

if(NULL == jobj) {

std::cout << file << ":" << lineno << " " << prefix << "NULL" << std::endl;

return;

}

JNIEnv *env = getEnv();

jclass clss = env->GetObjectClass(jobj);

bool isnull = (jobj == NULL) || (env->IsSameObject(jobj,NULL) == JNI_TRUE);

if(isnull) {

std::cout << file << ":" << lineno << " jobj=" << jobj << " " << prefix << "NULL" << std::endl;

return;

}

jmethodID midToString = env->GetMethodID(clss, "toString", "()Ljava/lang/String;");

jstring jobjstr = (jstring) env->CallObjectMethod(jobj, midToString);

jboolean iscopy = JNI_FALSE;

const char *cstr = env->GetStringUTFChars(jobjstr, &iscopy);

std::cout << file << ":" << lineno << " jobj=" << jobj << " " << prefix << cstr << std::endl;

env->ReleaseStringUTFChars(jobjstr,cstr);

}

void PrintObject(const char *prefix, const ::simple::java::lang::Object &objref) {

PrintJObject(prefix,objref.jthis);

}

extern void SetDebugJ4Cpp(bool debug) {

debug_j4cpp = debug;

}

extern bool GetDebugJ4Cpp() {

return debug_j4cpp;

}

// end namespace simple

}

java4cpp/examples/simple/simple0.cpp at java4cpp-1.0 · wshackle/java4cpp · GitHub

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