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 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_scripting.hxx"
#include <cppuhelper/implementationentry.hxx>
#include <cppuhelper/factory.hxx>
#include <tools/diagnose_ex.h>

#include <util/scriptingconstants.hxx>
#include <util/util.hxx>

#include <com/sun/star/container/XContentEnumerationAccess.hpp>
#include "ProviderCache.hxx"

using namespace com::sun::star;
using namespace com::sun::star::uno;
using namespace com::sun::star::script;

namespace func_provider
{

ProviderCache::ProviderCache( const Reference< XComponentContext >& xContext, const Sequence< Any >& scriptContext )
    throw ( RuntimeException ) : m_Sctx( scriptContext ), m_xContext( xContext )
{
    // initialise m_hProviderDetailsCache with details of ScriptProviders
    // will use createContentEnumeration
    
    m_xMgr = m_xContext->getServiceManager();
    ENSURE_OR_THROW( m_xMgr.is(), "ProviderCache::ProviderCache() failed to obtain ServiceManager" );
    populateCache();
}


ProviderCache::ProviderCache( const Reference< XComponentContext >& xContext, const Sequence< Any >& scriptContext, const Sequence< ::rtl::OUString >& blackList )
    throw ( RuntimeException ) : m_sBlackList( blackList ), m_Sctx( scriptContext ), m_xContext( xContext )

{
    // initialise m_hProviderDetailsCache with details of ScriptProviders
    // will use createContentEnumeration
    
    m_xMgr = m_xContext->getServiceManager();
    ENSURE_OR_THROW( m_xMgr.is(), "ProviderCache::ProviderCache() failed to obtain ServiceManager" );
    populateCache();
}

ProviderCache::~ProviderCache()
{
}
 
Reference< provider::XScriptProvider > 
ProviderCache::getProvider( const ::rtl::OUString& providerName )
{
    ::osl::Guard< osl::Mutex > aGuard( m_mutex );
    Reference< provider::XScriptProvider > provider;
    ProviderDetails_hash::iterator h_it = m_hProviderDetailsCache.find( providerName );
    if ( h_it != m_hProviderDetailsCache.end() )
    {
        if (  h_it->second.provider.is() )
        { 
            provider = h_it->second.provider;
        }
	else 
	{
	    // need to create provider and insert into hash
            provider = createProvider( h_it->second );
	}	      
    }
    return provider;
}

Sequence < Reference< provider::XScriptProvider > >
ProviderCache::getAllProviders() throw ( RuntimeException )
{
    Sequence < Reference< provider::XScriptProvider > > providers (  m_hProviderDetailsCache.size() );
    // need to create providers that haven't been created already
    // so check what providers exist and what ones don't

    ::osl::Guard< osl::Mutex > aGuard( m_mutex );
    ProviderDetails_hash::iterator h_itEnd =  m_hProviderDetailsCache.end();
    ProviderDetails_hash::iterator h_it = m_hProviderDetailsCache.begin();
    // should assert if size !>  0
    if (  m_hProviderDetailsCache.size() )
    {
        sal_Int32 providerIndex = 0;
	sal_Int32 index = 0;
        for ( index = 0; h_it !=  h_itEnd; ++h_it, index++ )	 
        {
            Reference< provider::XScriptProvider > xScriptProvider  = h_it->second.provider;
            if ( xScriptProvider.is() )
            {
                providers[ providerIndex++ ] = xScriptProvider;
            }
            else 
            {
                // create provider
                try
                { 
                    xScriptProvider  = createProvider( h_it->second ); 
                    providers[ providerIndex++ ] = xScriptProvider; 
                }
                catch ( Exception& e )
                {
                    ::rtl::OUString temp = OUSTR( "ProviderCache::getAllProviders: failed to create provider, " );
                    temp.concat( e.Message );
                    //throw RuntimeException( temp.concat( e.Message ),
                    //    Reference< XInterface >() );
                }
            }
        }		

        if ( providerIndex < index )
        {
            providers.realloc( providerIndex );
        }
	
    }	     
    else
    {
        OSL_TRACE("no available providers, something very wrong!!!");
    }
    return providers;
}

void
ProviderCache::populateCache() throw ( RuntimeException )
{
    // wrong name in services.rdb
    ::rtl::OUString serviceName;
    ::osl::Guard< osl::Mutex > aGuard( m_mutex );
    try 
    {
        ::rtl::OUString languageProviderName( RTL_CONSTASCII_USTRINGPARAM(
            "com.sun.star.script.provider.LanguageScriptProvider" ) );

        Reference< container::XContentEnumerationAccess > xEnumAccess = Reference< container::XContentEnumerationAccess >( m_xMgr, UNO_QUERY_THROW );
        Reference< container::XEnumeration > xEnum = xEnumAccess->createContentEnumeration ( languageProviderName );

        while ( xEnum->hasMoreElements() )
        {

            Reference< lang::XSingleComponentFactory > factory( xEnum->nextElement(), UNO_QUERY_THROW );
            Reference< lang::XServiceInfo > xServiceInfo( factory, UNO_QUERY_THROW );

            Sequence< ::rtl::OUString > serviceNames = xServiceInfo->getSupportedServiceNames();
            	    
            if ( serviceNames.getLength() > 0 )
            {
                ::rtl::OUString searchString( RTL_CONSTASCII_USTRINGPARAM (
                    "com.sun.star.script.provider.ScriptProviderFor" ) );

                for ( sal_Int32 index = 0; index < serviceNames.getLength(); index++ )
                {
                    if ( serviceNames[ index ].indexOf( searchString ) == 0 && !isInBlackList(  serviceNames[ index ] ) )
                    {
                        serviceName = serviceNames[ index ];
                        ProviderDetails details;
                        details.factory = factory;
                        m_hProviderDetailsCache[ serviceName ] = details;
                        break;
                    }
                }
            }		    
        }
    }
    catch ( Exception e )
    {
        ::rtl::OUString temp = OUSTR(
            "ProviderCache::populateCache: couldn't obtain XSingleComponentFactory for " );
        temp.concat( serviceName );
        throw RuntimeException( temp.concat( e.Message ), Reference< XInterface >() );
    }
}

Reference< provider::XScriptProvider >
ProviderCache::createProvider( ProviderDetails& details ) throw ( RuntimeException )
{ 
    try
    {
        details.provider.set(
            details.factory->createInstanceWithArgumentsAndContext( m_Sctx, m_xContext ), UNO_QUERY_THROW );
    }
    catch ( RuntimeException& e )
    {
        ::rtl::OUString temp = ::rtl::OUString::createFromAscii("ProviderCache::createProvider() Error creating provider from factory!!!");
        throw RuntimeException( temp.concat( e.Message ), Reference< XInterface >() );
    }
        
    return details.provider; 
}
} //end namespace