Example usage for org.apache.commons.collections FactoryUtils nullFactory

Introduction

In this page you can find the example usage for org.apache.commons.collections FactoryUtils nullFactory.

Prototype

public static Factory nullFactory() 

Source Link

Document

Gets a Factory that will return null each time the factory is used.

Usage

From source file:org.diffkit.diff.sns.DKPoiSheet.java

@SuppressWarnings("unchecked")
private List<Type> discoverColumnTypes(List<Row> rows_) {
    if (CollectionUtils.isEmpty(rows_))
        return null;
    List<Type> columnTypes = GrowthList
            .decorate(LazyList.decorate(new ArrayList<Type>(), FactoryUtils.nullFactory()));
    int start = this.hasHeader() ? 1 : 0;
    for (int i = start; i < rows_.size(); i++) {
        Row aRow = rows_.get(i);//w w  w  . j a v  a2s  . c  o m
        int width = aRow.getLastCellNum();
        for (int j = 0; j < width; j++) {
            Cell cell = aRow.getCell(j);
            if (cell == null)
                continue;
            if (_isDebugEnabled) {
                _log.debug(String.format("cell->%s formatString->%s format->%s", cell.getColumnIndex(),
                        cell.getCellStyle().getDataFormatString(), cell.getCellStyle().getDataFormat()));
            }
            Type cellType = mapColumnType(cell);
            Type columnType = columnTypes.get(j);
            if (_isDebugEnabled)
                _log.debug("cellType->{} columnType->{}", cellType, columnType);
            if (columnType == null)
                columnTypes.set(j, cellType);
            else if (columnType != cellType)
                columnTypes.set(j, Type.MIXED);
        }
    }
    return columnTypes;
}

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