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+/*************************************************************************
+ *
+ *  $RCSfile: virtualmachine.hxx,v $
+ *
+ *  $Revision: 1.1 $
+ *
+ *  last change: $Author: sb $ $Date: 2002-12-06 11:33:26 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (the "License"); You may not use this file
+ *  except in compliance with the License. You may obtain a copy of the
+ *  License at http://www.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+#if !defined INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
+#define INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX
+
+#include "rtl/ref.hxx"
+#include "salhelper/simplereferenceobject.hxx"
+
+#include "jni.h"
+
+namespace jvmaccess {
+
+/** An encapsulating wrapper around a Java virtual machine.
+ */
+class VirtualMachine: public salhelper::SimpleReferenceObject
+{
+public:
+    /** A helper to attach a thread to a Java virtual machine.
+
+        @descr
+        Upon construction of a guard the current thread is attached to the
+        virtual machine, and upon destruction of the guard the thread is
+        detached again.  For any one thread, multiple instances of this class
+        may be used in a stack-like fashion (care is taken to only really
+        detach the thread from the virtual machine upon destruction of the guard
+        at the bottom of the stack).
+     */
+    class AttachGuard
+    {
+    public:
+        /** An exception indicating failure to create an AttachGuard.
+         */
+        class CreationException
+        {
+        public:
+            CreationException();
+
+            CreationException(CreationException const &);
+
+            virtual ~CreationException();
+
+            CreationException & operator =(CreationException const &);
+        };
+
+        /** Attach the current thread to a virtual machine.
+
+            @param rMachine
+            The virtual machine to attach to.
+
+            @exception CreationException
+            Thrown in case attaching fails (due to a JNI problem).
+         */
+        explicit AttachGuard(rtl::Reference< VirtualMachine > const & rMachine);
+
+        /** Detach the current thread from the virtual machine again.
+         */
+        ~AttachGuard();
+
+        /** Get a JNI environment pointer for the current thread.
+
+            @return
+            A valid JNI environment pointer.  Will never be null.
+         */
+        inline JNIEnv * getEnvironment() const { return m_pEnvironment; }
+
+    private:
+        AttachGuard(AttachGuard &); // not implemented
+        void operator =(AttachGuard); // not implemented
+
+        rtl::Reference< VirtualMachine > m_xMachine;
+        JNIEnv * m_pEnvironment;
+        bool m_bDetach;
+    };
+
+    /** Create a wrapper around a Java virtual machine.
+
+        @param pVm
+        A JNI pointer to virtual machine.  Must not be null.
+
+        @param nVersion
+        The JNI version of the virtual machine pointed to by pVm.  Must be at
+        least JNI_VERSION_1_2.
+
+        @param bDestroy
+        Whether to destroy the virtual machine when destructing the wrapper
+        (i.e., whether the wrapper owns the virtual machine pointed to by pVm).
+
+        @param pMainThreadEnv
+        A valid JNI environment pointer for the current thread; must not be
+        null.  The current thread must be "initially attached" to the virtual
+        machine while this constructor is being called (i.e., it must be the
+        thread that has called JNI_CreateJavaVM in case the virtual machine has
+        been started via the JNI Invocation API, and it must not already have
+        called DetachCurrentThread; or it must be executing native code called
+        from a "primordial" virtual machine).  This environment pointer is used
+        to obtain a reference to the thread's current context class loader
+        (java.lang.Thread.getCurrentClassLoader).  If later a native thread is
+        attached to the virtual machine, that thread's context class loader
+        would be null, so the AttachGuard first of all sets it to the saved
+        value.  In a nutshell, this means that all native threads attached to
+        the virtual machine use the context class loader of the "initial Java
+        thread."
+     */
+    VirtualMachine(JavaVM * pVm, jint nVersion, bool bDestroy,
+                   JNIEnv * pMainThreadEnv);
+
+private:
+    VirtualMachine(VirtualMachine &); // not implemented
+    void operator =(VirtualMachine); // not implemented
+
+    virtual ~VirtualMachine();
+
+    void acquireInitialContextClassLoader(JNIEnv * pEnv);
+
+    void releaseInitialContextClassLoader() const;
+
+    JNIEnv * attachThread(bool * pAttached) const;
+
+    void detachThread() const;
+
+    JavaVM * m_pVm;
+    jint m_nVersion;
+    bool m_bDestroy;
+    jobject m_aInitialContextClassLoader;
+
+    friend class AttachGuard; // to access attachThread, detachThread
+};
+
+}
+
+#endif // INCLUDED_JVMACCESS_VIRTUALMACHINE_HXX