LibreOffice
LibreOffice 25.8 SDK API Reference
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must be implemented by the user of the XJavaVM. More...
import "XJavaVM.idl";
Public Member Functions | |
any | getJavaVM ([in] sequence< byte > processID) |
returns the address of the Java Virtual Machine. | |
boolean | isVMStarted () |
returns TRUE if the VM is started successfully, otherwise FALSE. | |
boolean | isVMEnabled () |
Returns TRUE if the VM is enabled. | |
Public Member Functions inherited from XInterface | |
any | queryInterface ([in] type aType) |
queries for a new interface to an existing UNO object. | |
void | acquire () |
increases the reference counter by one. | |
void | release () |
decreases the reference counter by one. |
must be implemented by the user of the XJavaVM.
jvmaccess::VirtualMachine
and jvmaccess::UnoVirtualMachine
used by com::sun::star::java::XJavaVM::getJavaVM() are not part of the public C++ UNO runtime API). This should probably be replaced by an appropriate C/C++ API. any getJavaVM | ( | [in] sequence< byte > | processID | ) |
returns the address of the Java Virtual Machine.
If the VM is not already instantiated, it will be now.
If the processID
is a normal 16-byte ID, the returned any contains a JNI JavaVM
pointer as a long or hyper integer (depending on the platform). If the processID
does not match the current process, or if the VM cannot be instantiated for whatever reason, a VOID any is returned.
If the processID
has an additional 17th byte of value 0
, the returned any contains a non–reference-counted pointer to a (reference-counted) instance of the C++ jvmaccess::VirtualMachine
class, always represented as a hyper integer. The pointer is guaranteed to be valid as long as the reference to this com::sun::star::java::XJavaVM is valid (but the pointer should be converted into a reference-counted reference as soon as possible). Again, if the first 16 bytes of the processID
do not match the current process, or if the VM cannot be instantiated for whatever reason, a VOID any is returned.
If the processID
has an additional 17th byte of value 1
, the returned any contains a non–reference-counted pointer to a (reference-counted) instance of the C++ jvmaccess::UnoVirtualMachine
class, always represented as a hyper integer. The pointer is guaranteed to be valid as long as the reference to this com::sun::star::java::XJavaVM is valid. Again, if the first 16 bytes of the processID
do not match the current process, or if the VM cannot be instantiated for whatever reason, a VOID any is returned.
The first form (returning a JNI JavaVM
pointer) is mainly for backwards compatibility, new code should use the second form (returning a pointer to a jvmaccess::VirtualMachine
) if it does not want to use the Java UNO environment, and it should use the third form (returning a pointer to a jvmaccess::UnoVirtualMachine
) if it wants to use the Java UNO environment. For example, one advantage of using jvmaccess::VirtualMachine
instead of the raw JavaVM
pointer is that whenever you attach a native thread to the Java virtual machine, that thread's context ClassLoader
(see java.lang.Thread.getContextClassLoader
) will automatically be set to a meaningful value.
processID | The process ID of the caller's process, possibly extended by a 17th byte of value 0 or 1 . |
boolean isVMEnabled | ( | ) |
Returns TRUE if the VM is enabled.
It is only possible to get the VM, if this method return 0.
boolean isVMStarted | ( | ) |
returns TRUE if the VM is started successfully, otherwise FALSE.