private void _validateAttributes()

in impl/src/main/java/org/apache/myfaces/view/facelets/component/UIRepeat.java [1358:1474]
105 lines of code
44 McCabe index (conditional complexity)

    private void _validateAttributes() throws FacesException
    {
        
        int begin = getBegin();
        int end = getEnd();
        int size = getSize();
        _emptyModel = getDataModel() == EMPTY_MODEL && begin != -1 && end != -1;
        int count = getRowCount();
        int offset = getOffset();
        if (begin == -1)
        {
            if (size >= 0)
            {
                end = getOffset() + getSize();
            }
        }      
       
        if (end == -1 && size == -1) 
        {
            if (begin == -1) 
            {
                end = getDataModel().getRowCount();
            } 
            else 
            {
                end = getDataModel().getRowCount() - 1;
            }
        }
        
        int step = getStep();
        boolean sizeIsEnd = _emptyModel;
        boolean countdown = _emptyModel && end < begin;

        if (size == -1)
        {
            if (begin == -1)
            {
                size =  end;
                sizeIsEnd = true;
            } 
            else 
            {
                size = countdown ? (begin - end + 1)/step : (end - begin + 1)/step;
            }     
        }
        
        step = countdown && step > 0 ? -step : step;

        if (_emptyModel)
        {
            if (step > 0 && (end < begin))
            {
                throw new LocationAwareFacesException("on empty models, end cannot be less than begin " +
                        "when the step is positive", this);
            }
            else if (step < 0 && (end > begin))
            {
                throw new LocationAwareFacesException("on empty models, end cannot be greater than begin " +
                        "when the step is negative", this);
            }
            setStep(step);
        }
        else if (end >= 0)
        {
            if (size < 0)
            {
                throw new LocationAwareFacesException("iteration size cannot be less than zero", this);
            }
            else if (!sizeIsEnd && (begin == -1) && (offset + size) > end)
            {
                throw new LocationAwareFacesException("iteration size cannot be greater than collection size", this);
            }
            else if (!sizeIsEnd && (begin == -1) && (offset + size) > count)
            {
                throw new LocationAwareFacesException("iteration size cannot be greater than collection size", this);
            }
            else if (!sizeIsEnd && (begin >= 0) && (begin + size) > end+1)
            {
                throw new LocationAwareFacesException("iteration size cannot be greater than collection size", this);
            }
            else if(!sizeIsEnd && (begin >= 0) && (end+1 > count))
            {
                throw new LocationAwareFacesException("end cannot be greater than collection size", this);
            }
            else if(!sizeIsEnd && (begin >= 0) && (begin > count))
            {
                throw new LocationAwareFacesException("begin cannot be greater than collection size", this);
            }
        }

        if (begin >= 0 && begin > end)
        {
            throw new LocationAwareFacesException("begin cannot be greater than end", this);
        }
        if (size > -1 && offset > end)
        {
            throw new LocationAwareFacesException("iteration offset cannot be greater than collection size", this);
        }

        if (!_emptyModel && step == -1)
        {
            setStep(1);
        }

        if (!_emptyModel && step < 0)
        {
            throw new LocationAwareFacesException("iteration step size cannot be less than zero", this);
        }

        else if (step == 0)
        {
            throw new LocationAwareFacesException("iteration step size cannot be equal to zero", this);
        }

        _end = end;
        
    }