/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#include <cppuhelper/factory.hxx>
#include <cppuhelper/implbase1.hxx>
#include <cppuhelper/implbase2.hxx>
#include <cppuhelper/implbase3.hxx>
#include <osl/diagnose.h>
#include <uno/lbnames.h>

#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/lang/XMultiServiceFactory.hpp>
#include <com/sun/star/lang/XSingleServiceFactory.hpp>

#include <com/sun/star/beans/PropertyValue.hpp>

#include <com/sun/star/xml/sax/XParser.hpp>
#include <com/sun/star/xml/sax/InputSource.hpp>
#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
#include <com/sun/star/xml/sax/SAXException.hpp>
#include <com/sun/star/xml/XImportFilter.hpp>
#include <com/sun/star/xml/XExportFilter.hpp>

#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XOutputStream.hpp>
#include <com/sun/star/io/XActiveDataSource.hpp>
#include <com/sun/star/io/XSeekable.hpp>

using namespace ::rtl;
using namespace ::cppu;
using namespace ::osl;
using namespace ::com::sun::star::beans;
using namespace ::com::sun::star::io;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::registry;
using namespace ::com::sun::star::xml;
using namespace ::com::sun::star::xml::sax;

namespace XFlatXml {

class XFlatXml : public WeakImplHelper3< XImportFilter, XExportFilter, XDocumentHandler>
{
private:
    // the UNO ServiceFactory
    Reference< XMultiServiceFactory > m_rServiceFactory;

    // DocumentHandler interface of the css::xml::sax::Writer service
    Reference < XExtendedDocumentHandler > m_rDocumentHandler;

    // controls pretty-printing
    sal_Bool m_bPrettyPrint;

public:

    // ctor...
    XFlatXml( const Reference< XMultiServiceFactory > &r )
        : m_rServiceFactory(r)
        , m_bPrettyPrint(sal_True)
    {}

    // XImportFilter
    virtual sal_Bool SAL_CALL importer(
            const Sequence<PropertyValue>& aSourceData,
            const Reference<XDocumentHandler>& xHandler,
            const Sequence<OUString>& msUserData);

    // XExportFilter
    virtual sal_Bool SAL_CALL exporter(
            const Sequence<PropertyValue>& aSourceData,
            const Sequence<OUString>& msUserData);

    // XDocumentHandler
    virtual void SAL_CALL startDocument();
    virtual void SAL_CALL endDocument();
    virtual void SAL_CALL startElement(const OUString& str, const Reference<XAttributeList>& attriblist);
    virtual void SAL_CALL endElement(const OUString& str);
    virtual void SAL_CALL characters(const OUString& str);
    virtual void SAL_CALL ignorableWhitespace(const OUString& str);
    virtual void SAL_CALL processingInstruction(const OUString& str, const OUString& str2);
    virtual void SAL_CALL setDocumentLocator(const Reference<XLocator>& doclocator);
};

sal_Bool XFlatXml::importer(
        const Sequence<PropertyValue>& aSourceData,
        const Reference<XDocumentHandler>& xHandler,
        const Sequence<OUString>& msUserData)
{
    // get information from media descriptor
    // the input stream that represents the imported file
    // is most important here since we need to supply it to
    // the sax parser that drives the supplied document handler
    sal_Int32 nLength = aSourceData.getLength();
    OUString aName, aFileName, aURL;
    Reference< XInputStream > xInputStream;
    for ( sal_Int32 i = 0 ; i < nLength; i++)
    {
        aName = aSourceData[i].Name;
        if ( aName == "InputStream" )
            aSourceData[i].Value >>= xInputStream;
        else if ( aName == "FileName" )
            aSourceData[i].Value >>= aFileName;
        else if ( aName == "URL" )
            aSourceData[i].Value >>= aURL;
    }

    // we need an input stream
    OSL_ASSERT(xInputStream.is());
    if (!xInputStream.is()) return sal_False;

    // rewind seekable stream
    Reference< XSeekable > xSeek(xInputStream, UNO_QUERY);
    if (xSeek.is())
        xSeek->seek(0);


    // create SAX parser that will read the document file
    // and provide events to xHandler passed to this call
    Reference < XParser > xSaxParser( m_rServiceFactory->createInstance(
        "com.sun.star.xml.sax.Parser"), UNO_QUERY );
    OSL_ASSERT(xSaxParser.is());
    if(!xSaxParser.is())return sal_False;

    // let the parser try to send the sax event to the document handler
    try
    {
        InputSource aInput;
        aInput.sSystemId = aURL;
        aInput.sPublicId = aURL;
        aInput.aInputStream = xInputStream;
        xSaxParser->setDocumentHandler(xHandler);
        xSaxParser->parseStream(aInput);
    }
    catch( Exception &exc)
    {
        // something went wrong
        OSL_FAIL(rtl::OUStringToOString(exc.Message,RTL_TEXTENCODING_UTF8).getStr());
        return sal_False;
    }

    // done
    return sal_True;
}

sal_Bool XFlatXml::exporter(
        const Sequence<PropertyValue>& aSourceData,
        const Sequence<OUString>& msUserData)
{

    // read source data
    // we are especially interested in the output stream
    // since that is where our xml-writer will push the data
    // from its data-source interface
    OUString aName, sURL;
    Reference<XOutputStream> rOutputStream;
    sal_Int32 nLength = aSourceData.getLength();
    for ( sal_Int32 i = 0 ; i < nLength; i++)
    {
        aName = aSourceData[i].Name;
        if ( aName == "OutputStream" )
            aSourceData[i].Value >>= rOutputStream;
        else if ( aName == "URL" )
            aSourceData[i].Value >>= sURL;
    }

    if (!m_rDocumentHandler.is()) {
        // get the document writer
        m_rDocumentHandler = Reference<XExtendedDocumentHandler>(
            m_rServiceFactory->createInstance("com.sun.star.xml.sax.Writer"),
            UNO_QUERY);
        OSL_ASSERT(m_rDocumentHandler.is());
        if (!m_rDocumentHandler.is()) return sal_False;
    }
    // get data source interface ...
    Reference< XActiveDataSource > rDataSource(m_rDocumentHandler, UNO_QUERY);
    OSL_ASSERT(rDataSource.is());
    if (!rDataSource.is()) return sal_False;
    OSL_ASSERT(rOutputStream.is());
    if (!rOutputStream.is()) return sal_False;
    // ... and set output stream
    rDataSource->setOutputStream(rOutputStream);

    return sal_True;
}

// for the DocumentHandler implementation, we just proxy the
// events to the XML writer that we created upon the output stream
// that was provided by the XMLFilterAdapter
void XFlatXml::startDocument(){
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->startDocument();
}

void XFlatXml::endDocument(){
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->endDocument();
}

void XFlatXml::startElement(const OUString& str, const Reference<XAttributeList>& attriblist)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->startElement(str, attriblist);
}

void XFlatXml::endElement(const OUString& str)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->endElement(str);
}

void XFlatXml::characters(const OUString& str)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->characters(str);
}

void XFlatXml::ignorableWhitespace(const OUString& str)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    if (!m_bPrettyPrint) return;
    m_rDocumentHandler->ignorableWhitespace(str);
}

void  XFlatXml::processingInstruction(const OUString& str, const OUString& str2)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->processingInstruction(str, str2);
}

void XFlatXml::setDocumentLocator(const Reference<XLocator>& doclocator)
{
    OSL_ASSERT(m_rDocumentHandler.is());
    m_rDocumentHandler->setDocumentLocator(doclocator);
}


// Component management

Reference< XInterface > SAL_CALL CreateInstance( const Reference< XMultiServiceFactory > &r)
{
    return Reference< XInterface >(( OWeakObject *)new XFlatXml(r));
}

Sequence< OUString > getSupportedServiceNames()
{
    static Sequence < OUString > *pNames = 0;
    if( ! pNames )
    {
        MutexGuard guard( Mutex::getGlobalMutex() );
        if( !pNames )
        {
            static Sequence< OUString > seqNames(1);
            seqNames.getArray()[0] = OUString(
                "devguide.officedev.samples.filter.FlatXmlCpp");
            pNames = &seqNames;
        }
    }
    return *pNames;
}

}

using namespace XFlatXml;
#define IMPLEMENTATION_NAME "devguide.officedev.samples.filter.FlatXmlCpp"


extern "C"
{
SAL_DLLPUBLIC_EXPORT void * SAL_CALL component_getFactory(
    const char * pImplName, void * pServiceManager, void * pRegistryKey )
{
    void * pRet = 0;

    if (pServiceManager && rtl_str_compare( pImplName, IMPLEMENTATION_NAME ) == 0)
    {
        Reference< XSingleServiceFactory > xFactory( createSingleFactory(
            reinterpret_cast< XMultiServiceFactory * >( pServiceManager ),
            OUString::createFromAscii( pImplName ),
            CreateInstance, getSupportedServiceNames() ) );

        if (xFactory.is())
        {
            xFactory->acquire();
            pRet = xFactory.get();
        }
    }
    return pRet;
}

SAL_DLLPUBLIC_EXPORT void SAL_CALL component_getImplementationEnvironment(
    char const ** ppEnvTypeName, uno_Environment **)
{
    *ppEnvTypeName = CPPU_CURRENT_LANGUAGE_BINDING_NAME;
}

} // extern "C"

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