/* -*- 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 "property_description.hxx"
#include "property_meta_data.hxx"
#include <forms/form_handler_factory.hxx>
#include "strings.hxx"
#include <xmloff/xmltoken.hxx>
#include <xmloff/xmlnmspe.hxx>

#include <tools/debug.hxx>
#include <osl/diagnose.h>

#include <unordered_map>

namespace xmloff { namespace metadata
{

    using namespace ::xmloff::token;

#define FORM_SINGLE_PROPERTY( id, att ) \
    PropertyDescription( PROPERTY_##id, XML_NAMESPACE_FORM, att, &FormHandlerFactory::getFormPropertyHandler, PID_##id, NO_GROUP )

    //= property meta data
    namespace
    {
        const PropertyDescription* lcl_getPropertyMetaData()
        {
            static const PropertyDescription s_propertyMetaData[] =
            {
                FORM_SINGLE_PROPERTY( DATE_MIN,        XML_MIN_VALUE        ),
                FORM_SINGLE_PROPERTY( DATE_MAX,        XML_MAX_VALUE        ),
                FORM_SINGLE_PROPERTY( DEFAULT_DATE,    XML_VALUE            ),
                FORM_SINGLE_PROPERTY( DATE,            XML_CURRENT_VALUE    ),
                FORM_SINGLE_PROPERTY( TIME_MIN,        XML_MIN_VALUE        ),
                FORM_SINGLE_PROPERTY( TIME_MAX,        XML_MAX_VALUE        ),
                FORM_SINGLE_PROPERTY( DEFAULT_TIME,    XML_VALUE            ),
                FORM_SINGLE_PROPERTY( TIME,            XML_CURRENT_VALUE    ),

                PropertyDescription()
            };
            return s_propertyMetaData;
        }
    }

    namespace
    {
        // TODO: instead of having all of the below static, it should be some per-instance data. This way, the
        // approach used here would scale much better.
        // That is, if you have multiple "meta data instances", which manage a small, but closed set of properties,
        // then looking through those multiple instances would probably be faster than searching within
        // one big instance, since in this case, every instance can quickly decide whether it is responsible
        // for some attribute or property, and otherwise delegate to the next instance.

        typedef std::unordered_map< OUString, const PropertyDescription* > DescriptionsByName;

        const DescriptionsByName& lcl_getPropertyDescriptions()
        {
            DBG_TESTSOLARMUTEX();
            static DescriptionsByName s_propertyDescriptionsByName;
            if ( s_propertyDescriptionsByName.empty() )
            {
                const PropertyDescription* desc = lcl_getPropertyMetaData();
                while ( !desc->propertyName.isEmpty() )
                {
                    s_propertyDescriptionsByName[ desc->propertyName ] = desc;
                    ++desc;
                }
            }
            return s_propertyDescriptionsByName;
        }

        typedef ::std::map< PropertyGroup, PropertyDescriptionList > IndexedPropertyGroups;

        const IndexedPropertyGroups& lcl_getIndexedPropertyGroups()
        {
            DBG_TESTSOLARMUTEX();
            static IndexedPropertyGroups s_indexedPropertyGroups;
            if ( s_indexedPropertyGroups.empty() )
            {
                const PropertyDescription* desc = lcl_getPropertyMetaData();
                while ( !desc->propertyName.isEmpty() )
                {
                    if ( desc->propertyGroup != NO_GROUP )
                        s_indexedPropertyGroups[ desc->propertyGroup ].push_back( desc );
                    ++desc;
                }
            }
            return s_indexedPropertyGroups;
        }

        typedef std::unordered_map< OUString, XMLTokenEnum > ReverseTokenLookup;

        const ReverseTokenLookup& getReverseTokenLookup()
        {
            DBG_TESTSOLARMUTEX();
            static ReverseTokenLookup s_reverseTokenLookup;
            if ( s_reverseTokenLookup.empty() )
            {
                const PropertyDescription* desc = lcl_getPropertyMetaData();
                while ( !desc->propertyName.isEmpty() )
                {
                    s_reverseTokenLookup[ token::GetXMLToken( desc->attribute.attributeToken ) ] = desc->attribute.attributeToken;
                    ++desc;
                }
            }
            return s_reverseTokenLookup;
        }

        struct AttributeHash
        {
            size_t operator()( const AttributeDescription& i_attribute ) const
            {
                return size_t( i_attribute.attributeToken * 100 ) + size_t( i_attribute.namespacePrefix );
            }
        };

        typedef std::unordered_multimap< AttributeDescription, PropertyGroup, AttributeHash > AttributeGroups;

        const AttributeGroups& lcl_getAttributeGroups()
        {
            DBG_TESTSOLARMUTEX();
            static AttributeGroups s_attributeGroups;
            if ( s_attributeGroups.empty() )
            {
                const PropertyDescription* desc = lcl_getPropertyMetaData();
                while ( !desc->propertyName.isEmpty() )
                {
                    if ( desc->propertyGroup != NO_GROUP )
                        s_attributeGroups.emplace( desc->attribute, desc->propertyGroup );
                    ++desc;
                }
            }
            return s_attributeGroups;
        }

        typedef std::unordered_map< AttributeDescription, PropertyGroups, AttributeHash > AttributesWithoutGroup;

        const AttributesWithoutGroup& lcl_getAttributesWithoutGroups()
        {
            DBG_TESTSOLARMUTEX();
            static AttributesWithoutGroup s_attributesWithoutGroup;
            if ( s_attributesWithoutGroup.empty() )
            {
                const PropertyDescription* desc = lcl_getPropertyMetaData();
                while ( !desc->propertyName.isEmpty() )
                {
                    if ( desc->propertyGroup == NO_GROUP )
                    {
                        PropertyDescriptionList singleElementList;
                        singleElementList.push_back( desc );

                        s_attributesWithoutGroup[ desc->attribute ].push_back( singleElementList );
                    }
                    ++desc;
                }
            }
            return s_attributesWithoutGroup;
        }
    }

    const PropertyDescription* getPropertyDescription( const OUString& i_propertyName )
    {
        const DescriptionsByName& rAllDescriptions( lcl_getPropertyDescriptions() );
        DescriptionsByName::const_iterator pos = rAllDescriptions.find( i_propertyName );
        if ( pos != rAllDescriptions.end() )
            return pos->second;
        return nullptr;
    }

    void getPropertyGroup( const PropertyGroup i_propertyGroup, PropertyDescriptionList& o_propertyDescriptions )
    {
        OSL_ENSURE( i_propertyGroup != NO_GROUP, "xmloff::metadata::getPropertyGroup: illegal group!" );

        const IndexedPropertyGroups& rPropertyGroups( lcl_getIndexedPropertyGroups() );
        const IndexedPropertyGroups::const_iterator pos = rPropertyGroups.find( i_propertyGroup );
        if ( pos != rPropertyGroups.end() )
            o_propertyDescriptions = pos->second;
    }

    void getPropertyGroupList( const AttributeDescription& i_attribute, PropertyGroups& o_propertyGroups )
    {
        const AttributeGroups& rAttributeGroups = lcl_getAttributeGroups();

        ::std::pair< AttributeGroups::const_iterator, AttributeGroups::const_iterator >
            range = rAttributeGroups.equal_range( i_attribute );

        if ( range.first == range.second )
        {
            // the attribute is not used for any non-trivial group, which means it is mapped directly to
            // a single property
            const AttributesWithoutGroup& attributesWithoutGroups( lcl_getAttributesWithoutGroups() );
            const AttributesWithoutGroup::const_iterator pos = attributesWithoutGroups.find( i_attribute );
            if ( pos != attributesWithoutGroups.end() )
                o_propertyGroups = pos->second;
        }
        else
        {
            const IndexedPropertyGroups& rPropertyGroups = lcl_getIndexedPropertyGroups();
            for ( AttributeGroups::const_iterator group = range.first; group != range.second; ++group )
            {
                const PropertyGroup propGroup = group->second;
                const IndexedPropertyGroups::const_iterator groupPos = rPropertyGroups.find( propGroup );
                if( groupPos == rPropertyGroups.end() )
                {
                    SAL_WARN( "xmloff.forms", "getPropertyGroupList: inconsistency!" );
                    continue;
                }

                o_propertyGroups.push_back( groupPos->second );
            }
        }
    }

    AttributeDescription getAttributeDescription( const sal_uInt16 i_namespacePrefix, const OUString& i_attributeName )
    {
        AttributeDescription attribute;
        const ReverseTokenLookup& rTokenLookup( getReverseTokenLookup() );
        const ReverseTokenLookup::const_iterator pos = rTokenLookup.find( i_attributeName );
        if ( pos != rTokenLookup.end() )
        {
            attribute.namespacePrefix = i_namespacePrefix;
            attribute.attributeToken = pos->second;
        }
        return attribute;
    }

} } // namespace xmloff::metadata

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