jstring String_createJavaString(text* t)
{
jstring result = 0;
if(t != 0)
{
char* utf8;
char* src = VARDATA(t);
int srcLen = VARSIZE(t) - VARHDRSZ;
if(srcLen == 0)
return 0;
/* Would be nice if a direct conversion to UTF16 was provided.
*/
utf8 = (char*)pg_do_encoding_conversion((unsigned char*)src, srcLen, GetDatabaseEncoding(), PG_UTF8);
result = JNI_newStringUTF(utf8);
/* pg_do_encoding_conversion will return the source argument
* when no conversion is required. We don't want to accidentally
* free that pointer.
*/
if(utf8 != src)
pfree(utf8);
}
return result;
}
jstring String_createJavaStringFromNTS(const char* cp)
{
jstring result = 0;
if(cp != 0)
{
/* Would be nice if a direct conversion to UTF16 was provided.
*/
char* utf8 = (char*)pg_do_encoding_conversion((unsigned char*)cp, strlen(cp), GetDatabaseEncoding(), PG_UTF8);
result = JNI_newStringUTF(utf8);
/* pg_do_encoding_conversion will return the source argument
* when no conversion is required. We don't want to accidentally
* free that pointer.
*/
if(utf8 != cp)
pfree(utf8);
}
return result;
}
static void String_initialize_codec()
{
jmethodID string_intern = PgObject_getJavaMethod(s_String_class,
"intern", "()Ljava/lang/String;");
jstring empty = JNI_newStringUTF( "");
jclass scharset_class =
PgObject_getJavaClass("java/nio/charset/StandardCharsets");
jfieldID scharset_UTF_8 = PgObject_getStaticJavaField(scharset_class,
"UTF_8", "Ljava/nio/charset/Charset;");
jobject u8cs = JNI_getStaticObjectField(scharset_class, scharset_UTF_8);
jclass charset_class = JNI_getObjectClass(u8cs);
jmethodID charset_newDecoder = PgObject_getJavaMethod(charset_class,
"newDecoder", "()Ljava/nio/charset/CharsetDecoder;");
jmethodID charset_newEncoder = PgObject_getJavaMethod(charset_class,
"newEncoder", "()Ljava/nio/charset/CharsetEncoder;");
jclass decoder_class =
PgObject_getJavaClass("java/nio/charset/CharsetDecoder");
jclass encoder_class =
PgObject_getJavaClass("java/nio/charset/CharsetEncoder");
jmethodID encoder_abpc =
PgObject_getJavaMethod(encoder_class, "averageBytesPerChar", "()F");
jclass result_class = PgObject_getJavaClass("java/nio/charset/CoderResult");
jfieldID overflow = PgObject_getStaticJavaField(result_class, "OVERFLOW",
"Ljava/nio/charset/CoderResult;");
jfieldID underflow = PgObject_getStaticJavaField(result_class, "UNDERFLOW",
"Ljava/nio/charset/CoderResult;");
jclass buffer_class = PgObject_getJavaClass("java/nio/Buffer");
s_CharsetDecoder_instance =
JNI_newGlobalRef(JNI_callObjectMethod(u8cs, charset_newDecoder));
s_CharsetEncoder_instance =
JNI_newGlobalRef(JNI_callObjectMethod(u8cs, charset_newEncoder));
s_CharsetDecoder_decode = PgObject_getJavaMethod(decoder_class, "decode",
"(Ljava/nio/ByteBuffer;)Ljava/nio/CharBuffer;");
s_CharsetEncoder_encode = PgObject_getJavaMethod(encoder_class, "encode",
"(Ljava/nio/CharBuffer;Ljava/nio/ByteBuffer;Z)"
"Ljava/nio/charset/CoderResult;");
s_CharsetEncoder_averageBytesPerChar =
JNI_callFloatMethod(s_CharsetEncoder_instance, encoder_abpc);
s_CoderResult_OVERFLOW = JNI_newGlobalRef(
JNI_getStaticObjectField(result_class, overflow));
s_CoderResult_UNDERFLOW = JNI_newGlobalRef(
JNI_getStaticObjectField(result_class, underflow));
s_CoderResult_throwException = PgObject_getJavaMethod(result_class,
"throwException", "()V");
s_CharBuffer_class = (jclass)JNI_newGlobalRef(
PgObject_getJavaClass("java/nio/CharBuffer"));
s_CharBuffer_wrap = PgObject_getStaticJavaMethod(s_CharBuffer_class,
"wrap", "(Ljava/lang/CharSequence;)Ljava/nio/CharBuffer;");
s_Buffer_position = PgObject_getJavaMethod(buffer_class,
"position", "()I");
s_Buffer_remaining = PgObject_getJavaMethod(buffer_class,
"remaining", "()I");
s_the_empty_string = JNI_newGlobalRef(
JNI_callObjectMethod(empty, string_intern));
s_server_encoding = GetDatabaseEncoding();
s_two_step_conversion = PG_UTF8 != s_server_encoding;
uninitialized = false;
}