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Fixes for StringBuffer typemap example

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4393 626c5289-ae23-0410-ae9c-e8d60b6d4f22
This commit is contained in:
William S Fulton 2003-02-25 21:53:28 +00:00
commit 09b0e0631e
1 changed files with 38 additions and 24 deletions
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62
SWIG/Examples/java/typemap/example.i
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@ -37,51 +37,65 @@ void f1(char *s);
* f2 can be seen in Java. */
void f2(char *BYTE);
/* alternative approach uses a StringBuffer typemap for argout */
/* what is the corresponding jni type */
/* Alternative approach uses a StringBuffer typemap for argout */
/* Define the types to use in the generated JNI C code and Java code */
%typemap(jni) char *SBUF "jobject"
/* what types to use in java source code */
%typemap(jtype) char *SBUF "StringBuffer"
%typemap(jstype) char *SBUF "StringBuffer"
/* how to convert java type to requested c type */
/* How to convert Java(JNI) type to requested C type */
%typemap(in) char *SBUF {
jclass sbufClass;
jmethodID toStringID;
jmethodID setLengthID;
jstring js;
$1 = NULL;
if($input != NULL) {
/* get the String from the StringBuffer */
sbufClass = (*jenv)->GetObjectClass(jenv, $input);
toStringID = (*jenv)->GetMethodID(jenv, sbufClass, "toString", "()Ljava/lang/String;");
js = (jstring) (*jenv)->CallObjectMethod(jenv, $input, toStringID);
/* convert the String to a char * */
$1 = (char *)(*jenv)->GetStringUTFChars(jenv, js, 0);
/* zero the original StringBuffer, so we can replace it with the result */
/* Get the String from the StringBuffer */
jmethodID setLengthID;
jclass sbufClass = (*jenv)->GetObjectClass(jenv, $input);
jmethodID toStringID = (*jenv)->GetMethodID(jenv, sbufClass, "toString", "()Ljava/lang/String;");
jstring js = (jstring) (*jenv)->CallObjectMethod(jenv, $input, toStringID);
/* Convert the String to a C string */
const char *pCharStr = (*jenv)->GetStringUTFChars(jenv, js, 0);
/* Take a copy of the C string as the typemap is for a non const C string */
jmethodID capacityID = (*jenv)->GetMethodID(jenv, sbufClass, "capacity", "()I");
jint capacity = (jint) (*jenv)->CallObjectMethod(jenv, $input, capacityID);
$1 = (char *) malloc(capacity+1);
strcpy($1, pCharStr);
/* Release the UTF string we obtained with GetStringUTFChars */
(*jenv)->ReleaseStringUTFChars(jenv, js, pCharStr);
/* Zero the original StringBuffer, so we can replace it with the result */
setLengthID = (*jenv)->GetMethodID(jenv, sbufClass, "setLength", "(I)V");
(*jenv)->CallVoidMethod(jenv, $input, setLengthID, (jint) 0);
}
}
/* how to convert the c type to the java type */
/* How to convert the C type to the Java(JNI) type */
%typemap(argout) char *SBUF {
jclass sbufClass;
jmethodID appendStringID;
if($1 != NULL) {
/* append the result to the empty StringBuffer */
sbufClass = (*jenv)->GetObjectClass(jenv, $input);
appendStringID = (*jenv)->GetMethodID(jenv, sbufClass, "append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
(*jenv)->CallObjectMethod(jenv, $input, appendStringID, (*jenv)->NewStringUTF(jenv, $1));
if($input != NULL) (*jenv)->ReleaseStringUTFChars(jenv, $input, $1);
/* Append the result to the empty StringBuffer */
jstring newString = (*jenv)->NewStringUTF(jenv, $1);
jclass sbufClass = (*jenv)->GetObjectClass(jenv, $input);
jmethodID appendStringID = (*jenv)->GetMethodID(jenv, sbufClass, "append", "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
(*jenv)->CallObjectMethod(jenv, $input, appendStringID, newString);
/* Clean up the string object, no longer needed */
free($1);
$1 = NULL;
}
}
/* Prevent the default freearg typemap from being used */
%typemap(freearg) char *SBUF ""
/* Convert the jstype to jtype typemap type */
%typemap(javain) char *SBUF "$javainput"
/* apply the new typemap to our function */
void f3(char *SBUF);