/**************************************************************
 * 
 * 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
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_chart2.hxx"
#include "RegressionCurveHelper.hxx"
#include "MeanValueRegressionCurveCalculator.hxx"
#include "LinearRegressionCurveCalculator.hxx"
#include "LogarithmicRegressionCurveCalculator.hxx"
#include "ExponentialRegressionCurveCalculator.hxx"
#include "PotentialRegressionCurveCalculator.hxx"
#include "CommonConverters.hxx"
#include "RegressionCurveModel.hxx"
#include "ChartTypeHelper.hxx"
#include "ChartModelHelper.hxx"
#include "macros.hxx"
#include "PropertyHelper.hxx"
#include "ResId.hxx"
#include "Strings.hrc"
#include "DiagramHelper.hxx"
#include <com/sun/star/chart2/XChartDocument.hpp>

using namespace ::com::sun::star;
using namespace ::com::sun::star::chart2;

using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::Sequence;
using ::com::sun::star::uno::XComponentContext;
using ::com::sun::star::lang::XServiceName;
using ::com::sun::star::beans::XPropertySet;
using ::com::sun::star::uno::Exception;
using ::rtl::OUString;

namespace
{
OUString lcl_getServiceNameForType( ::chart::RegressionCurveHelper::tRegressionType eType )
{
    OUString aServiceName;
    switch( eType )
    {
        case ::chart::RegressionCurveHelper::REGRESSION_TYPE_LINEAR:
            aServiceName = C2U( "com.sun.star.chart2.LinearRegressionCurve" );
            break;
        case ::chart::RegressionCurveHelper::REGRESSION_TYPE_LOG:
            aServiceName = C2U( "com.sun.star.chart2.LogarithmicRegressionCurve" );
            break;
        case ::chart::RegressionCurveHelper::REGRESSION_TYPE_EXP:
            aServiceName = C2U( "com.sun.star.chart2.ExponentialRegressionCurve" );
            break;
        case ::chart::RegressionCurveHelper::REGRESSION_TYPE_POWER:
            aServiceName = C2U( "com.sun.star.chart2.PotentialRegressionCurve" );
            break;
        default:
            OSL_ENSURE(false,"unknown regression curve type - use linear instead");
            aServiceName = C2U( "com.sun.star.chart2.LinearRegressionCurve" );
            break;
    }
    return aServiceName;
}
} // anonymous namespace

//.............................................................................
namespace chart
{
//.............................................................................

Reference< XRegressionCurve > RegressionCurveHelper::createMeanValueLine(
    const Reference< XComponentContext > & xContext )
{
    return Reference< XRegressionCurve >(
        new MeanValueRegressionCurve( xContext ));
}

Reference< XRegressionCurve > RegressionCurveHelper::createRegressionCurveByServiceName(
    const Reference< XComponentContext > & xContext,
    ::rtl::OUString aServiceName )
{
    Reference< XRegressionCurve > xResult;

    // todo: use factory methods with service name
    if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                "com.sun.star.chart2.LinearRegressionCurve" )))
    {
        xResult.set(
            new LinearRegressionCurve( xContext ));
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.LogarithmicRegressionCurve" )))
    {
        xResult.set(
            new LogarithmicRegressionCurve( xContext ));
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.ExponentialRegressionCurve" )))
    {
        xResult.set(
            new ExponentialRegressionCurve( xContext ));
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.PotentialRegressionCurve" )))
    {
        xResult.set(
            new PotentialRegressionCurve( xContext ));
    }

    return xResult;
}

// ------------------------------------------------------------

Reference< XRegressionCurveCalculator > RegressionCurveHelper::createRegressionCurveCalculatorByServiceName(
    ::rtl::OUString aServiceName )
{
    Reference< XRegressionCurveCalculator > xResult;

    // todo: use factory methods with service name
    if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.MeanValueRegressionCurve" )))
    {
        xResult.set( new MeanValueRegressionCurveCalculator());
    }
    if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.LinearRegressionCurve" )))
    {
        xResult.set( new LinearRegressionCurveCalculator());
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.LogarithmicRegressionCurve" )))
    {
        xResult.set( new LogarithmicRegressionCurveCalculator());
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.ExponentialRegressionCurve" )))
    {
        xResult.set( new ExponentialRegressionCurveCalculator());
    }
    else if( aServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM(
                     "com.sun.star.chart2.PotentialRegressionCurve" )))
    {
        xResult.set( new PotentialRegressionCurveCalculator());
    }

    return xResult;
}

void RegressionCurveHelper::initializeCurveCalculator(
    const Reference< XRegressionCurveCalculator > & xOutCurveCalculator,
    const Reference< data::XDataSource > & xSource,
    bool bUseXValuesIfAvailable /* = true */ )
{
    if( ! (xOutCurveCalculator.is() &&
           xSource.is() ))
        return;

    Sequence< double > aXValues, aYValues;
    bool bXValuesFound = false, bYValuesFound = false;

    Sequence< Reference< data::XLabeledDataSequence > > aDataSeqs( xSource->getDataSequences());
    sal_Int32 i = 0;
    for( i=0;
         ! (bXValuesFound && bYValuesFound) && i<aDataSeqs.getLength();
         ++i )
    {
        try
        {
            Reference< data::XDataSequence > xSeq( aDataSeqs[i]->getValues());
            Reference< XPropertySet > xProp( xSeq, uno::UNO_QUERY_THROW );
            ::rtl::OUString aRole;
            if( xProp->getPropertyValue(
                    ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "Role" ))) >>= aRole )
            {
                if( bUseXValuesIfAvailable &&
                    ! bXValuesFound &&
                    aRole.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( "values-x" )))
                {
                    aXValues = DataSequenceToDoubleSequence( xSeq );
                    bXValuesFound = true;
                }
                else if( ! bYValuesFound &&
                         aRole.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( "values-y" )))
                {
                    aYValues = DataSequenceToDoubleSequence( xSeq );
                    bYValuesFound = true;
                }
            }
        }
        catch( Exception & ex )
        {
            ASSERT_EXCEPTION( ex );
        }
    }

    if( ! bXValuesFound &&
        bYValuesFound )
    {
        // initialize with 1, 2, ...
        //first category (index 0) matches with real number 1.0
        aXValues.realloc( aYValues.getLength());
        for( i=0; i<aXValues.getLength(); ++i )
            aXValues[i] = i+1;
        bXValuesFound = true;
    }

    if( bXValuesFound && bYValuesFound &&
        aXValues.getLength() > 0 &&
        aYValues.getLength() > 0 )
        xOutCurveCalculator->recalculateRegression( aXValues, aYValues );
}

void RegressionCurveHelper::initializeCurveCalculator(
    const Reference< XRegressionCurveCalculator > & xOutCurveCalculator,
    const Reference< XDataSeries > & xSeries,
    const Reference< frame::XModel > & xModel )
{
    sal_Int32 nAxisType = ChartTypeHelper::getAxisType(
        ChartModelHelper::getChartTypeOfSeries( xModel, xSeries ), 0 ); // x-axis

    initializeCurveCalculator( xOutCurveCalculator,
                               uno::Reference< data::XDataSource >( xSeries, uno::UNO_QUERY ),
                               (nAxisType == AxisType::REALNUMBER) );
}

// ----------------------------------------

bool RegressionCurveHelper::hasMeanValueLine(
    const uno::Reference< XRegressionCurveContainer > & xRegCnt )
{
    if( !xRegCnt.is())
        return false;

    try
    {
        uno::Sequence< uno::Reference< XRegressionCurve > > aCurves(
            xRegCnt->getRegressionCurves());
        for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
        {
            if( isMeanValueLine( aCurves[i] ))
                return true;
        }
    }
    catch( Exception & ex )
    {
        ASSERT_EXCEPTION( ex );
    }

    return false;
}

bool RegressionCurveHelper::isMeanValueLine(
    const uno::Reference< chart2::XRegressionCurve > & xRegCurve )
{
    uno::Reference< XServiceName > xServName( xRegCurve, uno::UNO_QUERY );
    if( xServName.is() &&
        xServName->getServiceName().equals(
            C2U( "com.sun.star.chart2.MeanValueRegressionCurve" )))
        return true;
    return false;
}

uno::Reference< chart2::XRegressionCurve >
    RegressionCurveHelper::getMeanValueLine(
        const uno::Reference< chart2::XRegressionCurveContainer > & xRegCnt )
{
    if( xRegCnt.is())
    {
        try
        {
            uno::Sequence< uno::Reference< XRegressionCurve > > aCurves(
                xRegCnt->getRegressionCurves());
            for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
            {
                if( isMeanValueLine( aCurves[i] ))
                    return aCurves[i];
            }
        }
        catch( Exception & ex )
        {
            ASSERT_EXCEPTION( ex );
        }
    }

    return uno::Reference< chart2::XRegressionCurve >();
}

void RegressionCurveHelper::addMeanValueLine(
    uno::Reference< XRegressionCurveContainer > & xRegCnt,
    const uno::Reference< XComponentContext > & xContext,
    const uno::Reference< XPropertySet > & xSeriesProp )
{
    if( !xRegCnt.is() ||
        ::chart::RegressionCurveHelper::hasMeanValueLine( xRegCnt ) )
        return;

    // todo: use a valid context
    uno::Reference< XRegressionCurve > xCurve( createMeanValueLine( xContext ));
    xRegCnt->addRegressionCurve( xCurve );

    if( xSeriesProp.is())
    {
        uno::Reference< XPropertySet > xProp( xCurve, uno::UNO_QUERY );
        if( xProp.is())
        {
            xProp->setPropertyValue( C2U( "LineColor" ),
                                     xSeriesProp->getPropertyValue( C2U( "Color" )));
        }
    }
}

void RegressionCurveHelper::removeMeanValueLine(
    Reference< XRegressionCurveContainer > & xRegCnt )
{
    if( !xRegCnt.is())
        return;

    try
    {
        Sequence< Reference< XRegressionCurve > > aCurves(
            xRegCnt->getRegressionCurves());
        for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
        {
            if( isMeanValueLine( aCurves[i] ))
            {
                xRegCnt->removeRegressionCurve( aCurves[i] );
                // attention: the iterator i has become invalid now

                // note: assume that there is only one mean-value curve
                // to remove multiple mean-value curves remove the break
                break;
            }
        }
    }
    catch( Exception & ex )
    {
        ASSERT_EXCEPTION( ex );
    }
}

void RegressionCurveHelper::addRegressionCurve(
    tRegressionType eType,
    uno::Reference< XRegressionCurveContainer > & xRegCnt,
    const uno::Reference< XComponentContext > & /* xContext */,
    const uno::Reference< beans::XPropertySet >& xPropertySource,
    const uno::Reference< beans::XPropertySet >& xEquationProperties )
{
    if( !xRegCnt.is() )
        return;

    if( eType == REGRESSION_TYPE_NONE )
    {
        OSL_ENSURE(false,"don't create a regression curve of type none");
        return;
    }

    uno::Reference< chart2::XRegressionCurve > xCurve;
    ::rtl::OUString aServiceName( lcl_getServiceNameForType( eType ));

    if( aServiceName.getLength())
    {
        // todo: use a valid context
        xCurve.set( createRegressionCurveByServiceName(
                         uno::Reference< uno::XComponentContext >(), aServiceName ));

        if( xEquationProperties.is())
            xCurve->setEquationProperties( xEquationProperties );

        uno::Reference< beans::XPropertySet > xProp( xCurve, uno::UNO_QUERY );
        if( xProp.is())
        {
            if( xPropertySource.is())
                comphelper::copyProperties( xPropertySource, xProp );
            else
            {
                uno::Reference< XPropertySet > xSeriesProp( xRegCnt, uno::UNO_QUERY );
                if( xSeriesProp.is())
                {
                    xProp->setPropertyValue( C2U( "LineColor" ),
                                             xSeriesProp->getPropertyValue( C2U( "Color" )));
                }
//                 xProp->setPropertyValue( C2U( "LineWidth" ), uno::makeAny( sal_Int32( 100 )));
            }
        }
    }
    xRegCnt->addRegressionCurve( xCurve );
}

/** removes all regression curves that are not of type mean value
    and returns true, if anything was removed
 */
bool RegressionCurveHelper::removeAllExceptMeanValueLine(
    uno::Reference< chart2::XRegressionCurveContainer > & xRegCnt )
{
    bool bRemovedSomething = false;
    if( xRegCnt.is())
    {
        try
        {
            uno::Sequence< uno::Reference< chart2::XRegressionCurve > > aCurves(
                xRegCnt->getRegressionCurves());
            ::std::vector< uno::Reference< chart2::XRegressionCurve > > aCurvesToDelete;
            for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
            {
                if( ! isMeanValueLine( aCurves[i] ))
                {
                    aCurvesToDelete.push_back( aCurves[ i ] );
                }
            }

            for( ::std::vector< uno::Reference< chart2::XRegressionCurve > >::const_iterator aIt = aCurvesToDelete.begin();
                     aIt != aCurvesToDelete.end(); ++aIt )
            {
                xRegCnt->removeRegressionCurve( *aIt );
                bRemovedSomething = true;
            }
        }
        catch( uno::Exception & ex )
        {
            ASSERT_EXCEPTION( ex );
        }
    }
    return bRemovedSomething;
}

void RegressionCurveHelper::removeEquations(
        uno::Reference< chart2::XRegressionCurveContainer > & xRegCnt )
{
    if( xRegCnt.is())
    {
        try
        {
            uno::Sequence< uno::Reference< chart2::XRegressionCurve > > aCurves(
                xRegCnt->getRegressionCurves());
            for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
            {
                if( !isMeanValueLine( aCurves[i] ) )
                {
                    uno::Reference< chart2::XRegressionCurve > xRegCurve( aCurves[ i ] );
                    if( xRegCurve.is() )
                    {
                        uno::Reference< beans::XPropertySet > xEqProp( xRegCurve->getEquationProperties() ) ;
                        if( xEqProp.is())
                        {
                            xEqProp->setPropertyValue( C2U("ShowEquation"), uno::makeAny( false ));
                            xEqProp->setPropertyValue( C2U("ShowCorrelationCoefficient"), uno::makeAny( false ));
                        }
                    }
                }
            }
        }
        catch( uno::Exception & ex )
        {
            ASSERT_EXCEPTION( ex );
        }
    }
}

void RegressionCurveHelper::replaceOrAddCurveAndReduceToOne(
    tRegressionType eType,
    uno::Reference< XRegressionCurveContainer > & xRegCnt,
    const uno::Reference< XComponentContext > & xContext )
{
    uno::Reference< chart2::XRegressionCurve > xRegressionCurve( getFirstCurveNotMeanValueLine( xRegCnt ));
    if( ! xRegressionCurve.is())
        RegressionCurveHelper::addRegressionCurve( eType, xRegCnt, xContext );
    else
    {
        OUString aServiceName( lcl_getServiceNameForType( eType ));
        if( aServiceName.getLength())
        {
            RegressionCurveHelper::removeAllExceptMeanValueLine( xRegCnt );
            RegressionCurveHelper::addRegressionCurve(
                eType, xRegCnt, xContext,
                Reference< beans::XPropertySet >( xRegressionCurve, uno::UNO_QUERY ),
                xRegressionCurve->getEquationProperties());
        }
    }
}

uno::Reference< chart2::XRegressionCurve > RegressionCurveHelper::getFirstCurveNotMeanValueLine(
    const Reference< XRegressionCurveContainer > & xRegCnt )
{
    if( !xRegCnt.is())
        return NULL;
    
    try
    {
        uno::Sequence< uno::Reference< chart2::XRegressionCurve > > aCurves(
            xRegCnt->getRegressionCurves());
        ::std::vector< uno::Reference< chart2::XRegressionCurve > > aCurvesToDelete;
        for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
        {
            if( ! isMeanValueLine( aCurves[i] ))
            {
                return aCurves[ i ];
            }
        }
    }
    catch( Exception & ex )
    {
        ASSERT_EXCEPTION( ex );
    }

    return NULL;
}

RegressionCurveHelper::tRegressionType RegressionCurveHelper::getRegressionType(
    const Reference< XRegressionCurve > & xCurve )
{
    tRegressionType eResult = REGRESSION_TYPE_UNKNOWN;

    try
    {
        Reference< lang::XServiceName > xServName( xCurve, uno::UNO_QUERY );
        if( xServName.is())
        {
            ::rtl::OUString aServiceName( xServName->getServiceName() );

            if( aServiceName.equalsAsciiL(
                    RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.LinearRegressionCurve" )))
            {
                eResult = REGRESSION_TYPE_LINEAR;
            }
            else if( aServiceName.equalsAsciiL(
                         RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.LogarithmicRegressionCurve" )))
            {
                eResult = REGRESSION_TYPE_LOG;
            }
            else if( aServiceName.equalsAsciiL(
                         RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.ExponentialRegressionCurve" )))
            {
                eResult = REGRESSION_TYPE_EXP;
            }
            else if( aServiceName.equalsAsciiL(
                         RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.PotentialRegressionCurve" )))
            {
                eResult = REGRESSION_TYPE_POWER;
            }
            else if( aServiceName.equalsAsciiL(
                         RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.MeanValueRegressionCurve" )))
            {
                eResult = REGRESSION_TYPE_MEAN_VALUE;
            }
        }
    }
    catch( Exception & ex )
    {
        ASSERT_EXCEPTION( ex );
    }

    return eResult;
}

RegressionCurveHelper::tRegressionType RegressionCurveHelper::getFirstRegressTypeNotMeanValueLine(
    const Reference< XRegressionCurveContainer > & xRegCnt )
{
    tRegressionType eResult = REGRESSION_TYPE_NONE;

    if( xRegCnt.is())
    {
        Sequence< Reference< XRegressionCurve > > aCurves(
            xRegCnt->getRegressionCurves());
        for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
        {
            tRegressionType eType = getRegressionType( aCurves[i] );
            if( eType != REGRESSION_TYPE_MEAN_VALUE &&
                eType != REGRESSION_TYPE_UNKNOWN )
            {
                eResult = eType;
                break;
            }
        }
    }

    return eResult;
}

OUString RegressionCurveHelper::getUINameForRegressionCurve( const Reference< XRegressionCurve >& xRegressionCurve )
{
    OUString aResult;
    Reference< lang::XServiceName > xServiceName( xRegressionCurve, uno::UNO_QUERY );
    if( ! xServiceName.is())
        return aResult;

    OUString aServiceName( xServiceName->getServiceName());
    if( aServiceName.equalsAsciiL(
            RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.MeanValueRegressionCurve" )))
    {
        aResult = ::chart::SchResId::getResString( STR_REGRESSION_MEAN );
    }
    else if( aServiceName.equalsAsciiL(
                 RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.LinearRegressionCurve" )))
    {
        aResult = ::chart::SchResId::getResString( STR_REGRESSION_LINEAR );
    }
    else if( aServiceName.equalsAsciiL(
                 RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.LogarithmicRegressionCurve" )))
    {
        aResult = ::chart::SchResId::getResString( STR_REGRESSION_LOG );
    }
    else if( aServiceName.equalsAsciiL(
                 RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.ExponentialRegressionCurve" )))
    {
        aResult = ::chart::SchResId::getResString( STR_REGRESSION_EXP );
    }
    else if( aServiceName.equalsAsciiL(
                 RTL_CONSTASCII_STRINGPARAM( "com.sun.star.chart2.PotentialRegressionCurve" )))
    {
        aResult = ::chart::SchResId::getResString( STR_REGRESSION_POWER );
    }

    return aResult;
}

::std::vector< Reference< chart2::XRegressionCurve > >
    RegressionCurveHelper::getAllRegressionCurvesNotMeanValueLine(
        const Reference< chart2::XDiagram > & xDiagram )
{
    ::std::vector< Reference< chart2::XRegressionCurve > > aResult;
    ::std::vector< Reference< chart2::XDataSeries > > aSeries( DiagramHelper::getDataSeriesFromDiagram( xDiagram ));
    for( ::std::vector< Reference< chart2::XDataSeries > >::iterator aIt( aSeries.begin());
         aIt != aSeries.end(); ++aIt )
    {
        Reference< chart2::XRegressionCurveContainer > xCurveCnt( *aIt, uno::UNO_QUERY );
        if( xCurveCnt.is())
        {
            uno::Sequence< uno::Reference< chart2::XRegressionCurve > > aCurves(
                xCurveCnt->getRegressionCurves());
            for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
            {
                if( ! isMeanValueLine( aCurves[i] ))
                    aResult.push_back( aCurves[i] );
            }
        }
    }

    return aResult;
}

void RegressionCurveHelper::resetEquationPosition(
    const Reference< chart2::XRegressionCurve > & xCurve )
{
    if( xCurve.is())
    {
        try
        {
            const OUString aPosPropertyName( RTL_CONSTASCII_USTRINGPARAM( "RelativePosition" ));
            Reference< beans::XPropertySet > xEqProp( xCurve->getEquationProperties()); // since m233: , uno::UNO_SET_THROW );
            if( xEqProp->getPropertyValue( aPosPropertyName ).hasValue())
                xEqProp->setPropertyValue( aPosPropertyName, uno::Any());
        }
        catch( const uno::Exception & ex )
        {
            ASSERT_EXCEPTION( ex );
        }
    }
}

sal_Int32 RegressionCurveHelper::getRegressionCurveIndex(
    const Reference< chart2::XRegressionCurveContainer > & xContainer,
    const Reference< chart2::XRegressionCurve > & xCurve )
{
    if( xContainer.is())
    {
        uno::Sequence< uno::Reference< XRegressionCurve > > aCurves(
            xContainer->getRegressionCurves());
        for( sal_Int32 i = 0; i < aCurves.getLength(); ++i )
        {
            if( xCurve == aCurves[i] )
                return i;
        }
    }
    return -1;
}

bool RegressionCurveHelper::hasEquation( const Reference< chart2::XRegressionCurve > & xCurve )
{
    bool bHasEquation = false; 
    if( xCurve.is())
    {
        uno::Reference< beans::XPropertySet > xEquationProp( xCurve->getEquationProperties());
        if( xEquationProp.is())
        {
            bool bShowEquation = false;
            bool bShowCoefficient = false;
            xEquationProp->getPropertyValue( C2U("ShowEquation")) >>= bShowEquation;
            xEquationProp->getPropertyValue( C2U("ShowCorrelationCoefficient")) >>= bShowCoefficient;
            bHasEquation = bShowEquation || bShowCoefficient;
        }
    }
    return bHasEquation;
}

//.............................................................................
} //namespace chart
//.............................................................................