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186 lines
5.7 KiB
186 lines
5.7 KiB
![]()
4 years ago
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/* -----------------------------------------------------------------------------
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* See the LICENSE file for information on copyright, usage and redistribution
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* of SWIG, and the README file for authors - http://www.swig.org/release.html.
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*
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* director.swg
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*
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* This file contains support for director classes that proxy
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* method calls from C++ to Java extensions.
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* ----------------------------------------------------------------------------- */
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#ifdef __cplusplus
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#if defined(DEBUG_DIRECTOR_OWNED)
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#include <iostream>
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#endif
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namespace Swig {
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/* Java object wrapper */
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class JObjectWrapper {
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public:
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JObjectWrapper() : jthis_(NULL), weak_global_(true) {
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}
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~JObjectWrapper() {
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jthis_ = NULL;
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weak_global_ = true;
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}
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bool set(JNIEnv *jenv, jobject jobj, bool mem_own, bool weak_global) {
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if (!jthis_) {
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weak_global_ = weak_global;
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if (jobj)
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jthis_ = ((weak_global_ || !mem_own) ? jenv->NewWeakGlobalRef(jobj) : jenv->NewGlobalRef(jobj));
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "JObjectWrapper::set(" << jobj << ", " << (weak_global ? "weak_global" : "global_ref") << ") -> " << jthis_ << std::endl;
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#endif
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return true;
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} else {
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "JObjectWrapper::set(" << jobj << ", " << (weak_global ? "weak_global" : "global_ref") << ") -> already set" << std::endl;
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#endif
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return false;
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}
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}
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jobject get(JNIEnv *jenv) const {
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "JObjectWrapper::get(";
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if (jthis_)
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std::cout << jthis_;
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else
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std::cout << "null";
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std::cout << ") -> return new local ref" << std::endl;
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#endif
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return (jthis_ ? jenv->NewLocalRef(jthis_) : jthis_);
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}
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void release(JNIEnv *jenv) {
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "JObjectWrapper::release(" << jthis_ << "): " << (weak_global_ ? "weak global ref" : "global ref") << std::endl;
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#endif
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if (jthis_) {
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if (weak_global_) {
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if (jenv->IsSameObject(jthis_, NULL) == JNI_FALSE)
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jenv->DeleteWeakGlobalRef((jweak)jthis_);
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} else
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jenv->DeleteGlobalRef(jthis_);
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}
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jthis_ = NULL;
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weak_global_ = true;
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}
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jobject peek() {
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return jthis_;
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}
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/* Java proxy releases ownership of C++ object, C++ object is now
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responsible for destruction (creates NewGlobalRef to pin Java
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proxy) */
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void java_change_ownership(JNIEnv *jenv, jobject jself, bool take_or_release) {
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if (take_or_release) { /* Java takes ownership of C++ object's lifetime. */
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if (!weak_global_) {
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jenv->DeleteGlobalRef(jthis_);
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jthis_ = jenv->NewWeakGlobalRef(jself);
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weak_global_ = true;
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}
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} else { /* Java releases ownership of C++ object's lifetime */
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if (weak_global_) {
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jenv->DeleteWeakGlobalRef((jweak)jthis_);
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jthis_ = jenv->NewGlobalRef(jself);
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weak_global_ = false;
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}
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}
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}
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private:
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/* pointer to Java object */
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jobject jthis_;
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/* Local or global reference flag */
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bool weak_global_;
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};
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/* director base class */
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class Director {
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/* pointer to Java virtual machine */
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JavaVM *swig_jvm_;
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protected:
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#if defined (_MSC_VER) && (_MSC_VER<1300)
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class JNIEnvWrapper;
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friend class JNIEnvWrapper;
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#endif
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/* Utility class for managing the JNI environment */
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class JNIEnvWrapper {
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const Director *director_;
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JNIEnv *jenv_;
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public:
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JNIEnvWrapper(const Director *director) : director_(director), jenv_(0) {
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director_->swig_jvm_->AttachCurrentThread((void **) &jenv_, NULL);
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}
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~JNIEnvWrapper() {
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// Some JVMs, eg JDK 1.4.2 and lower on Solaris have a bug and crash with the DetachCurrentThread call.
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// However, without this call, the JVM hangs on exit when the thread was not created by the JVM and creates a memory leak.
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#if !defined(SWIG_JAVA_NO_DETACH_CURRENT_THREAD)
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director_->swig_jvm_->DetachCurrentThread();
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#endif
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}
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JNIEnv *getJNIEnv() const {
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return jenv_;
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}
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};
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/* Java object wrapper */
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JObjectWrapper swig_self_;
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/* Disconnect director from Java object */
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void swig_disconnect_director_self(const char *disconn_method) {
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JNIEnvWrapper jnienv(this) ;
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JNIEnv *jenv = jnienv.getJNIEnv() ;
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jobject jobj = swig_self_.peek();
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "Swig::Director::disconnect_director_self(" << jobj << ")" << std::endl;
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#endif
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if (jobj && jenv->IsSameObject(jobj, NULL) == JNI_FALSE) {
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jmethodID disconn_meth = jenv->GetMethodID(jenv->GetObjectClass(jobj), disconn_method, "()V");
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if (disconn_meth) {
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#if defined(DEBUG_DIRECTOR_OWNED)
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std::cout << "Swig::Director::disconnect_director_self upcall to " << disconn_method << std::endl;
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#endif
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jenv->CallVoidMethod(jobj, disconn_meth);
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}
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}
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}
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public:
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Director(JNIEnv *jenv) : swig_jvm_((JavaVM *) NULL), swig_self_() {
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/* Acquire the Java VM pointer */
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jenv->GetJavaVM(&swig_jvm_);
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}
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virtual ~Director() {
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JNIEnvWrapper jnienv(this) ;
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JNIEnv *jenv = jnienv.getJNIEnv() ;
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swig_self_.release(jenv);
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}
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bool swig_set_self(JNIEnv *jenv, jobject jself, bool mem_own, bool weak_global) {
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return swig_self_.set(jenv, jself, mem_own, weak_global);
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}
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jobject swig_get_self(JNIEnv *jenv) const {
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return swig_self_.get(jenv);
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}
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// Change C++ object's ownership, relative to Java
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void swig_java_change_ownership(JNIEnv *jenv, jobject jself, bool take_or_release) {
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swig_self_.java_change_ownership(jenv, jself, take_or_release);
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}
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};
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}
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#endif /* __cplusplus */
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