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[Java] Note use of %ignore with %native

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This is needed if you're wanting to effectively replace the generated
JNI wrapper for a C/C++ function.

Fixes https://sourceforge.net/p/swig/bugs/368/
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Olly Betts 2022-02-01 16:38:16 +13:00
commit eb13261950
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Doc/Manual/Java.html
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@ -9062,6 +9062,11 @@ You may have to add in some "jtype", "jstype", "javain" and "javaout" typemaps w
Here the default typemaps work for <tt>int</tt> and <tt>char *</tt>. Here the default typemaps work for <tt>int</tt> and <tt>char *</tt>.
</p> </p>
<p>
Note that if you're wanting to effectively <b>replace</b> the JNI code generated for a C/C++ function then you'll need to use <tt>%ignore</tt> as well
to tell SWIG not to automatically generate a JNI wrapper for it.
</p>
<p> <p>
In summary the <tt>%native</tt> directive is telling SWIG to generate the Java code to access the JNI C code, but not the JNI C function itself. In summary the <tt>%native</tt> directive is telling SWIG to generate the Java code to access the JNI C code, but not the JNI C function itself.
This directive is only really useful if you want to mix your own hand crafted JNI code and the SWIG generated code into one Java class or package. This directive is only really useful if you want to mix your own hand crafted JNI code and the SWIG generated code into one Java class or package.