/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <formulaparserpool.hxx>
#include <com/sun/star/container/XContentEnumerationAccess.hpp>
#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/lang/XSingleComponentFactory.hpp>
#include <com/sun/star/sheet/XFilterFormulaParser.hpp>
#include <rtl/instance.hxx>
#include <comphelper/processfactory.hxx>
#include <sfx2/objsh.hxx>
#include <document.hxx>

using namespace ::com::sun::star::beans;
using namespace ::com::sun::star::container;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::sheet;
using namespace ::com::sun::star::uno;

namespace {

class ScParserFactoryMap
{
public:
    explicit            ScParserFactoryMap();

    Reference< XFormulaParser > createFormulaParser(
                            const Reference< XComponent >& rxComponent,
                            const OUString& rNamespace );

private:
    typedef std::unordered_map<
        OUString, Reference< XSingleComponentFactory > > FactoryMap;

    Reference< XComponentContext > mxContext;   /// Global component context.
    FactoryMap          maFactories;            /// All parser factories, mapped by formula namespace.
};

ScParserFactoryMap::ScParserFactoryMap() :
    mxContext( ::comphelper::getProcessComponentContext() )
{
    if( mxContext.is() ) try
    {
        // enumerate all implementations of the FormulaParser service
        Reference< XContentEnumerationAccess > xFactoryEA( mxContext->getServiceManager(), UNO_QUERY_THROW );
        Reference< XEnumeration > xEnum( xFactoryEA->createContentEnumeration( "com.sun.star.sheet.FilterFormulaParser" ), UNO_SET_THROW );
        while( xEnum->hasMoreElements() ) try // single try/catch for every element
        {
            // create an instance of the formula parser implementation
            Reference< XSingleComponentFactory > xCompFactory( xEnum->nextElement(), UNO_QUERY_THROW );
            Reference< XFilterFormulaParser > xParser( xCompFactory->createInstanceWithContext( mxContext ), UNO_QUERY_THROW );

            // store factory in the map
            OUString aNamespace = xParser->getSupportedNamespace();
            if( !aNamespace.isEmpty() )
                maFactories[ aNamespace ] = xCompFactory;
        }
        catch( Exception& )
        {
        }
    }
    catch( Exception& )
    {
    }
}

Reference< XFormulaParser > ScParserFactoryMap::createFormulaParser(
        const Reference< XComponent >& rxComponent, const OUString& rNamespace )
{
    Reference< XFormulaParser > xParser;
    FactoryMap::const_iterator aIt = maFactories.find( rNamespace );
    if( aIt != maFactories.end() ) try
    {
        Sequence< Any > aArgs( 1 );
        aArgs[ 0 ] <<= rxComponent;
        xParser.set( aIt->second->createInstanceWithArgumentsAndContext( aArgs, mxContext ), UNO_QUERY_THROW );
    }
    catch( Exception& )
    {
    }
    return xParser;
}

struct ScParserFactorySingleton : public ::rtl::Static< ScParserFactoryMap, ScParserFactorySingleton > {};

} // namespace

ScFormulaParserPool::ScFormulaParserPool( const ScDocument& rDoc ) :
    mrDoc( rDoc )
{
}

ScFormulaParserPool::~ScFormulaParserPool()
{
}

bool ScFormulaParserPool::hasFormulaParser( const OUString& rNamespace )
{
    return getFormulaParser( rNamespace ).is();
}

Reference< XFormulaParser > ScFormulaParserPool::getFormulaParser( const OUString& rNamespace )
{
    // try to find an existing parser entry
    ParserMap::iterator aIt = maParsers.find( rNamespace );
    if( aIt != maParsers.end() )
        return aIt->second;

    // always create a new entry in the map (even if the following initialization fails)
    Reference< XFormulaParser >& rxParser = maParsers[ rNamespace ];

    // try to create a new parser object
    if( SfxObjectShell* pDocShell = mrDoc.GetDocumentShell() ) try
    {
        Reference< XComponent > xComponent( pDocShell->GetModel(), UNO_QUERY_THROW );
        ScParserFactoryMap& rFactoryMap = ScParserFactorySingleton::get();
        rxParser = rFactoryMap.createFormulaParser( xComponent, rNamespace );
    }
    catch( Exception& )
    {
    }
    return rxParser;
}

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