Re: building a jni bridge between java and xalan-c

[logancillo]

hi again Dave!


thx for your tips! then , what i need is to build my jni bridge in c++, isnt
it?

i wrote a preliminar c++ app:

// 
// File:   es_yell_frontlite_servlets_ContenedorRecursivoWidgets.h
// Author: alonso
//
// Created on 30 de enero de 2008, 12:02
//

#ifndef _ES_YELL_FRONTLITE_SERVLETS_CONTENEDORRECURSIVOWIDGETS_H
#define _ES_YELL_FRONTLITE_SERVLETS_CONTENEDORRECURSIVOWIDGETS_H
#include <jni.h>
#include <xercesc/util/PlatformUtils.hpp>
#include <xalanc/XalanTransformer/XalanTransformer.hpp>
#include <stdio.h>
#include <iostream.h>
#include <strstream>
XALAN_USING_STD(cout);
XALAN_USING_STD(endl);
XALAN_USING_STD(cerr);
XALAN_USING_XERCES(XMLPlatformUtils)
XALAN_USING_XERCES(XMLException)
XALAN_USING_XALAN(XalanTransformer)
XALAN_USING_XALAN(XalanCompiledStylesheet)
XALAN_USING_XALAN(XSLTInputSource)
XALAN_USING_STD(istrstream)
            
typedef XalanTransformer tXalanTransformer;

class XalanCpp_Engine{
    
    private :
    tXalanTransformer theXalanTransformer;
        
    /*
 * Class:     es_yell_frontlite_servlets_ContenedorRecursivoWidgets
 * Method:    generarTransletConXalanC
 * Signature: (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/Object;
 */
    public:
    JNIEXPORT jobject JNICALL
Java_es_yell_frontlite_servlets_ContenedorRecursivoWidgets_generarTransletConXalanC
    (JNIEnv *pEnv, jobject pObj, jstring rutaRelativaFicheroXSL, jstring
xsl);
};

#endif  /* _ES_YELL_FRONTLITE_SERVLETS_CONTENEDORRECURSIVOWIDGETS_H */

this is implementation file:

#include
"../XalanCpp_Engine/es_yell_frontlite_servlets_ContenedorRecursivoWidgets.h"

XalanCpp_Engine::JNIEXPORT jobject JNICALL 
Java_es_yell_frontlite_servlets_ContenedorRecursivoWidgets_generarTransletConXalanC
(JNIEnv *pEnv, jobject pObj, jstring rutaRelativaFicheroXSL, jstring xsl){

    cout<<"-->creando translet "<<rutaRelativaFicheroXSL<<endl;
    
    static XalanTransformer theXalanTransformer;
    const XalanCompiledStylesheet *compiledStylesheet = 0;
    int theResult =0;
    jboolean copy = JNI_FALSE; 
    const char *theStylesheet = env->GetStringUTFChars(xsl, &copy);
    if (theStylesheet == NULL) {
        return NULL; // Could be out of memory
    }
    cout<<"xsl: "<<theStylesheet<<endl;
    // Call the static initializer for Xerces.
    try
    {
        XMLPlatformUtils::Initialize();
    }
    catch (const XMLException& toCatch)
    {
        cerr << "Error during Xerces initialization.  Error code was "
        << toCatch.getCode()
        << "."
        << endl;
        theResult = -1;
    }
    if ( theResult == 0)
    {
        // Initialize Xalan.
        XalanTransformer::initialize();
        // Create a XalanTransformer.
        
        istrstream str(theStylesheet, strlen(theStylesheet));        
        const XSLTInputSource msgToTransform(&str); 
        int theResult = theXalanTransformer
                    .compileStylesheet(msgToTransform,compiledStylesheet);
    }
    if(theResult != 0)
    {
        cerr << "CompileStylesheet Error: " <<
theXalanTransformer.getLastError()
        << endl
        << endl;
    }
    return (jobject) compiledStylesheet;
    //return NULL;
}

Unfortunately it doesnt compile, its giving me this error: 

es_yell_frontlite_servlets_ContenedorRecursivoWidgets.cc:3: error: ‘jobject’
en la clase ‘XalanCpp_Engine’ no nombra a un tipo

wich translated to english :

error: jobject in class XalanCpp_Engine does not name a type

what do i m doing wrong? Am I directed well? The purpose of all that is to
be able to invoke from my java program this logic, that is to say, that this
method returns to me a precompiled translet and to be able to save this
object in a hashMap structure of my java application.

sorry for my poor english.

pls, help me! 
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