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 * Copyright 2008 by Sun Microsystems, Inc.
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 * OpenOffice.org - a multi-platform office productivity suite
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 * $RCSfile: relations.cxx,v $
 * $Revision: 1.4 $
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * (a copy is included in the LICENSE file that accompanied this code).
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#include "oox/core/relations.hxx"
#include "oox/helper/helper.hxx"

using ::rtl::OUString;

namespace oox {
namespace core {

// ============================================================================

Relations::Relations( const OUString& rBasePath ) :
    maBasePath( rBasePath )
{
}

const Relation* Relations::getRelationFromRelId( const OUString& rId ) const
{
    const_iterator aIt = find( rId );
    return (aIt == end()) ? 0 : &aIt->second;
}

const Relation* Relations::getRelationFromType( const OUString& rType ) const
{
    for( const_iterator aIt = begin(), aEnd = end(); aIt != aEnd; ++aIt )
        if( aIt->second.maType == rType )
            return &aIt->second;
    return 0;
}

RelationsRef Relations::getRelationsFromType( const OUString& rType ) const
{
    RelationsRef xRelations( new Relations( maBasePath ) );
    for( const_iterator aIt = begin(), aEnd = end(); aIt != aEnd; ++aIt )
        if( aIt->second.maType == rType )
            (*xRelations)[ aIt->first ] = aIt->second;
    return xRelations;
}

OUString Relations::getTargetFromRelId( const OUString& rRelId ) const
{
    if( const Relation* pRelation = getRelationFromRelId( rRelId ) )
        return pRelation->maTarget;
    return OUString();
}

OUString Relations::getTargetFromType( const OUString& rType ) const
{
    if( const Relation* pRelation = getRelationFromType( rType ) )
        return pRelation->maTarget;
    return OUString();
}

OUString Relations::getFragmentPathFromTarget( const OUString& rTarget ) const
{
    const sal_Unicode cDirSep = '/';

    // no target, no fragment path
    if( rTarget.getLength() == 0 )
        return OUString();

    // absolute target, or empty fragment path -> return target
    if( (rTarget[ 0 ] == cDirSep) || (maBasePath.getLength() == 0) )
        return rTarget;

    sal_Int32 nLastSepPos = maBasePath.lastIndexOf( cDirSep );
    OUString aPath = (nLastSepPos < 0) ? maBasePath : maBasePath.copy( 0, nLastSepPos );

    const OUString sBack = CREATE_OUSTRING( "../" );

    // First, count the number of "../"'s found in relative path string.
    sal_Int32 nCount = 0, nPos = 0;
    while ( true )
    {
        nPos = rTarget.indexOf(sBack, nCount*3);
        if ( nPos != nCount*3 )
            break;
        ++nCount;
    }

    // Now, reduce the base path's directory level by the count.
    for ( sal_Int32 i = 0; i < nCount; ++i )
    {
        sal_Int32 pos = aPath.lastIndexOf(cDirSep);
        if ( pos < 0 )
            // This is unexpected.  Bail out.
            return rTarget;
        aPath = aPath.copy( 0, pos );
    }

    aPath += OUString( cDirSep );
    aPath += rTarget.copy( nCount*3 );
    return aPath;
}

OUString Relations::getFragmentPathFromRelId( const OUString& rRelId ) const
{
    return getFragmentPathFromTarget( getTargetFromRelId( rRelId ) );
}

OUString Relations::getFragmentPathFromType( const OUString& rType ) const
{
    return getFragmentPathFromTarget( getTargetFromType( rType ) );
}

// ============================================================================

} // namespace core
} // namespace oox