Quelle  metainforeader.cxx   Sprache: C

/* -*- 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 <metainforeader.hxx>
#include "dummytag.hxx"
#include "simpletag.hxx"
#include "keywordstag.hxx"

#include <assert.h>

/** constructor.
*/
CMetaInfoReader::CMetaInfoReader( const Filepath_t& DocumentName ):
CBaseReader( DocumentName )
{
    try
    {
        m_pKeywords_Builder = new CKeywordsTag;
        m_pSimple_Builder = new CSimpleTag( );
        m_pDummy_Builder   = new CDummyTag;

        //retrieve all information that is useful
        m_AllMetaInfo[META_INFO_AUTHOR]               = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_TITLE]                = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_SUBJECT]              = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_KEYWORDS]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DESCRIPTION]          = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DOCUMENT_STATISTIC]   = EMPTY_XML_TAG;

        m_AllMetaInfo[META_INFO_GENERATOR]            = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_CREATION]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_CREATOR]              = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_MODIFIED]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_LANGUAGE]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DOCUMENT_NUMBER]      = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_EDITING_TIME]         = EMPTY_XML_TAG;

        Initialize( META_CONTENT_NAME );
    }
    catch(xml_parser_exception&)
    {
        // OSL_ENSURE(false, ex.what());
    }
    catch(...)
    {
        // OSL_ENSURE(false, "Unknown error");
    }
}

CMetaInfoReader::CMetaInfoReader( StreamInterface* stream ) :
CBaseReader( stream )
{
try
    {
        m_pKeywords_Builder = new CKeywordsTag;
        m_pSimple_Builder = new CSimpleTag( );
        m_pDummy_Builder   = new CDummyTag;

        //retrieve all information that is useful
        m_AllMetaInfo[META_INFO_AUTHOR]               = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_TITLE]                = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_SUBJECT]              = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_KEYWORDS]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DESCRIPTION]          = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DOCUMENT_STATISTIC]   = EMPTY_XML_TAG;

        m_AllMetaInfo[META_INFO_GENERATOR]            = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_CREATION]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_CREATOR]              = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_MODIFIED]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_LANGUAGE]             = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_DOCUMENT_NUMBER]      = EMPTY_XML_TAG;
        m_AllMetaInfo[META_INFO_EDITING_TIME]         = EMPTY_XML_TAG;

        Initialize( META_CONTENT_NAME );
    }
    catch(xml_parser_exception&)
    {
        // OSL_ENSURE(false, ex.what());
    }
    catch(...)
    {
        // OSL_ENSURE(false, "Unknown error");
    }

}

/** destructor.
*/

CMetaInfoReader::~CMetaInfoReader()
{
    delete m_pKeywords_Builder;
    delete m_pSimple_Builder;
    delete m_pDummy_Builder;
}


/***********************   export functions  ***********************/

/** check if the Tag is in the target meta.xml file.

    @param TagName
    the name of the tag that will be retrieve.
*/
bool CMetaInfoReader::hasTag(const std::wstring& TagName) const
{
    return ( m_AllMetaInfo.contains(TagName) );
}

/** Get a specific tag content, compound tags will be returned as comma separated list.

    @param TagName
    the name of the tag that will be retrieve.
*/
std::wstring CMetaInfoReader::getTagData( const std::wstring& TagName)
{
    if( hasTag( TagName ) )
        return m_AllMetaInfo[TagName].first;
    else
        return EMPTY_STRING;
}

/** check if the a tag has the specific attribute.

    @param TagName
    the name of the tag.
    @param AttributeName
    the name of the attribute.
*/
bool CMetaInfoReader::hasTagAttribute(const std::wstring& TagName,  const std::wstring& AttributeName)
{
    return ( m_AllMetaInfo[TagName].second.contains( AttributeName) );
}

/** Get a specific attribute content.

    @param TagName
    the name of the tag.
    @param AttributeName
    the name of the attribute.
*/
std::wstring CMetaInfoReader::getTagAttribute(const std::wstring& TagName,  const std::wstring& AttributeName)
{
    if (hasTagAttribute(TagName, AttributeName))
        return  m_AllMetaInfo[ TagName ].second[AttributeName];
    else
        return EMPTY_STRING;
}

/** helper function for getDefaultLocale().
*/
const LocaleSet_t EN_US_LOCALE( ::std::make_pair( ::std::wstring( L"en" ),  ::std::wstring( L"US" )));

static bool isValidLocale(const ::std::wstring& Locale)
{
    return ( Locale.length() == 5 );
}

/** Get the default language of the whole document, if no such field, en-US is returned.
*/
LocaleSet_t CMetaInfoReader::getDefaultLocale()
{
    if (hasTag(META_INFO_LANGUAGE))
    {
        ::std::wstring locale = m_AllMetaInfo[META_INFO_LANGUAGE].first;
        return isValidLocale(locale) ? ::std::make_pair(locale.substr( 0,2), locale.substr( 3,2)) : EN_US_LOCALE;
    }
    else
        return EN_US_LOCALE;
}

/***********************   tag related functions  ***********************/

/** choose an appropriate tag reader
*/

ITag* CMetaInfoReader::chooseTagReader( const std::wstring& tag_name, const XmlTagAttributes_t& XmlAttributes )
{
    if ( tag_name == META_INFO_KEYWORD )
    {
        m_AllMetaInfo[META_INFO_KEYWORDS].second = XmlAttributes;
        return m_pKeywords_Builder;
    }
    if (( tag_name == META_INFO_TITLE )||( tag_name == META_INFO_AUTHOR )||( tag_name == META_INFO_SUBJECT )||( tag_name == META_INFO_DESCRIPTION )||
        ( tag_name == META_INFO_DOCUMENT_STATISTIC )||( tag_name == META_INFO_GENERATOR )||( tag_name == META_INFO_CREATION )||( tag_name == META_INFO_CREATOR )||
        ( tag_name == META_INFO_MODIFIED )||( tag_name == META_INFO_LANGUAGE )||( tag_name == META_INFO_DOCUMENT_NUMBER )||( tag_name == META_INFO_EDITING_TIME ) )
    {
        m_AllMetaInfo[tag_name].second = XmlAttributes;
        return m_pSimple_Builder;
    }
    else
        return m_pDummy_Builder;

}


// save the received content into structure.

void CMetaInfoReader::saveTagContent( const std::wstring& tag_name )
{
    ITag* pTagBuilder;
    if ( tag_name == META_INFO_KEYWORDS )
        pTagBuilder = m_pKeywords_Builder;
    else if ( tag_name == META_INFO_KEYWORD )
    {
        // added for support for OASIS xml file format.
        m_AllMetaInfo[META_INFO_KEYWORDS].first =m_pKeywords_Builder->getTagContent( );
        return;
    }
    else if (( tag_name == META_INFO_TITLE )||( tag_name == META_INFO_AUTHOR )||( tag_name == META_INFO_SUBJECT )||( tag_name == META_INFO_DESCRIPTION )||
        ( tag_name == META_INFO_DOCUMENT_STATISTIC )||( tag_name == META_INFO_GENERATOR )||( tag_name == META_INFO_CREATION )||( tag_name == META_INFO_CREATOR )||
        ( tag_name == META_INFO_MODIFIED )||( tag_name == META_INFO_LANGUAGE )||( tag_name == META_INFO_DOCUMENT_NUMBER )||( tag_name == META_INFO_EDITING_TIME ) )
        pTagBuilder = m_pSimple_Builder;
    else
        pTagBuilder = m_pDummy_Builder;

    m_AllMetaInfo[tag_name].first =pTagBuilder->getTagContent( );
}


/***********************   event handler functions  ***********************/


// start_element occurs when a tag is start


void CMetaInfoReader::start_element(
    const string_t& /*raw_name*/,
    const string_t& local_name,
    const xml_tag_attribute_container_t& attributes)
{
    //get appropriate Xml Tag Builder using MetaInfoBuilderFactory;
    ITag* pTagBuilder = chooseTagReader( local_name,attributes );
    assert( pTagBuilder!= nullptr );
    pTagBuilder->startTag( );
    m_TagBuilderStack.push( pTagBuilder );

}


// end_element occurs when a tag is closed


void CMetaInfoReader::end_element(const string_t& /*raw_name*/, const string_t&&nbsp;local_name)
{
    assert( !m_TagBuilderStack.empty() );
    ITag* pTagBuilder = m_TagBuilderStack.top();
    m_TagBuilderStack.pop();
    pTagBuilder->endTag();

    saveTagContent( local_name );

}


// characters occurs when receiving characters


void CMetaInfoReader::characters( const string_t& character )
{
    if ( character.length() > 0 &&  !HasOnlySpaces( character ) )
    {
        ITag* pTagBuilder = m_TagBuilderStack.top();
        pTagBuilder->addCharacters( character );
    }
}

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