Build a library with the C++ part of environment setup

[sigrok-androidutils.git] / lib / jvm_glue.cpp

diff --git a/lib/jvm_glue.cpp b/lib/jvm_glue.cpp
new file mode 100644 (file)
index 0000000..7dbd03b
--- /dev/null
+++ b/lib/jvm_glue.cpp
@@ -0,0 +1,98 @@
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2014 Marcus Comstedt <marcus@mc.pp.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "libsigrokandroidutils.h"
+#include "libsigrokandroidutils-internal.h"
+
+static JavaVM *g_jvm = NULL;
+static jclass g_environment_class = 0;
+
+SRAU_PRIV int srau_get_java_env(JNIEnv **env)
+{
+       jint st;
+
+       if (g_jvm == NULL) {
+               return -1;
+       }
+
+       st = g_jvm->GetEnv((void **)env, JNI_VERSION_1_6);
+
+       if (st == JNI_EDETACHED) {
+               st = g_jvm->AttachCurrentThread(env, NULL);
+               if (st == JNI_OK)
+                       return 1;
+       }
+
+       return (st == JNI_OK? 0 : -1);
+}
+
+SRAU_PRIV void srau_unget_java_env(int mode)
+{
+       if (mode == 1) {
+               g_jvm->DetachCurrentThread();
+       }
+}
+
+SRAU_PRIV jclass srau_get_environment_class(JNIEnv *env)
+{
+       if (env && g_environment_class) {
+               return (jclass)env->NewLocalRef(g_environment_class);
+       } else {
+               return 0;
+       }
+}
+
+jint JNI_OnLoad(JavaVM *vm, void *reserved)
+{
+       JNIEnv* env;
+
+       (void)reserved;
+
+        if (vm->GetEnv((void **)&env, JNI_VERSION_1_6) != JNI_OK) {
+                return -1;
+        }
+
+        jclass envc = env->FindClass("org/sigrok/androidutils/Environment");
+       if (envc) {
+               g_environment_class = (jclass)env->NewGlobalRef(envc);
+               env->DeleteLocalRef(envc);
+       }
+
+       g_jvm = vm;
+
+       return JNI_VERSION_1_6;
+}
+
+void JNI_OnUnload(JavaVM *vm, void *reserved)
+{
+       JNIEnv* env;
+
+       (void)reserved;
+
+       g_jvm = NULL;
+
+        if (vm->GetEnv((void **)&env, JNI_VERSION_1_6) != JNI_OK) {
+                return;
+        }
+
+       if (g_environment_class) {
+               env->DeleteGlobalRef(g_environment_class);
+               g_environment_class = 0;
+       }
+}