dan-s1 commented on code in PR #9379: URL: https://github.com/apache/nifi/pull/9379#discussion_r1802089085
########## nifi-extension-bundles/nifi-poi-bundle/nifi-poi-services/src/main/java/org/apache/nifi/excel/StandardCellFieldTypeReader.java: ########## @@ -0,0 +1,152 @@ +/* + * 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. + */ +package org.apache.nifi.excel; + +import org.apache.nifi.schema.inference.FieldTypeInference; +import org.apache.nifi.schema.inference.TimeValueInference; +import org.apache.nifi.serialization.record.DataType; +import org.apache.nifi.serialization.record.RecordFieldType; +import org.apache.poi.ss.usermodel.Cell; +import org.apache.poi.ss.usermodel.CellType; +import org.apache.poi.ss.usermodel.DateUtil; + +import java.util.Map; +import java.util.Objects; +import java.util.Optional; + +/** + * Standard implementation of Cell Field Type Reader uses Cell Type and Cell Value information with inference based on Timestamp formats + */ +class StandardCellFieldTypeReader implements CellFieldTypeReader { + private final TimeValueInference timeValueInference; + + /** + * Standard Cell Field Type Reader constructor with Time Value Inference for handling STRING Cell Types that may contain values with Timestamps + * + * @param timeValueInference Time Value Inference required for STRING Cell Type evaluation + */ + StandardCellFieldTypeReader(final TimeValueInference timeValueInference) { + this.timeValueInference = Objects.requireNonNull(timeValueInference, "Time Value Inference required"); + } + + /** + * Infer Cell Field Type and append possible Data Types to mapped Field Type Inference information + * + * @param cell Spreadsheet Cell can be null + * @param fieldName Cell field name for tracking in Field Types required + * @param fieldTypes Map of Field Name to Field Type Inference information required + */ + @Override + public void inferCellFieldType(final Cell cell, final String fieldName, final Map<String, FieldTypeInference> fieldTypes) { + Objects.requireNonNull(fieldName, "Field Name required"); + Objects.requireNonNull(fieldTypes, "Field Types required"); + + final FieldTypeInference fieldTypeInference = fieldTypes.computeIfAbsent(fieldName, key -> new FieldTypeInference()); + final DataType dataType = getCellDataType(cell); + fieldTypeInference.addPossibleDataType(dataType); + } + + /** + * Get Record Data Type from Spreadsheet Cell Type and additional resolution of NUMERIC and STRING types + * + * @param cell Spreadsheet Cell can be null + * @return Record Data Type or null + */ + @Override + public DataType getCellDataType(final Cell cell) { + if (cell == null) { + return null; + } + + final CellType cellType = cell.getCellType(); + + final DataType dataType; + + if (CellType.NUMERIC == cellType) { + // Date Formatting check limited to NUMERIC Cell Types + if (DateUtil.isCellDateFormatted(cell)) { + dataType = getDateTimeDataType(cell); + } else { + final double numericCellValue = cell.getNumericCellValue(); + final long roundedCellValue = (long) numericCellValue; + if (roundedCellValue == numericCellValue) { + dataType = RecordFieldType.LONG.getDataType(); + } else { + // Default to DOUBLE for NUMERIC values following cell.getNumericCellValue() + dataType = RecordFieldType.DOUBLE.getDataType(); + } + } + } else if (CellType.BOOLEAN == cellType) { + dataType = RecordFieldType.BOOLEAN.getDataType(); + } else if (CellType.STRING == cellType) { + final String cellValue = cell.getStringCellValue(); + // Attempt Time Value inference for STRING cell values + final Optional<DataType> timeDataType = timeValueInference.getDataType(cellValue); + dataType = timeDataType.orElse(RecordFieldType.STRING.getDataType()); + } else if (CellType.FORMULA == cellType) { + dataType = getFormulaResultDataType(cell); + } else { + // Default to null for known and unknown Cell Types + dataType = null; + } + + return dataType; + } + + private DataType getDateTimeDataType(final Cell cell) { + final DataType dataType; + + final double numericCellValue = cell.getNumericCellValue(); + final long roundedCellValue = (long) numericCellValue; + if (roundedCellValue == numericCellValue) { + // Numbers without decimal fractions indicate Dates without Times + dataType = RecordFieldType.DATE.getDataType(); + } else if (numericCellValue < 1) { + // Decimal fractions indicate Times without Dates + dataType = RecordFieldType.TIME.getDataType(); + } else { + dataType = RecordFieldType.TIMESTAMP.getDataType(); + } + + return dataType; + } + + private DataType getFormulaResultDataType(final Cell cell) { + final DataType dataType; + + final CellType formulaResultType = cell.getCachedFormulaResultType(); + if (CellType.BOOLEAN == formulaResultType) { + dataType = RecordFieldType.BOOLEAN.getDataType(); + } else if (CellType.STRING == formulaResultType) { + dataType = RecordFieldType.STRING.getDataType(); + } else if (CellType.NUMERIC == formulaResultType) { + // Date Formatting check limited to NUMERIC Cell Types without Conditional Formatting Evaluator + if (DateUtil.isCellDateFormatted(cell)) { + // Default to TIMESTAMP for date formatted values using standard Date Time Pattern + dataType = RecordFieldType.TIMESTAMP.getDataType(); Review Comment: With a closer look at at the POI's `DataFormatter` code, specifically lines 513-522 ``` synchronized(dateFormat) { if (dateFormat instanceof ExcelStyleDateFormatter) { ((ExcelStyleDateFormatter)dateFormat).setDateToBeFormatted(cell.getNumericCellValue()); } Date d = cell.getDateCellValue(); return this.performDateFormatting(d, (Format)dateFormat); } ``` it seems it gets the cell's numeric or date value. If that is the case then I assume you can reuse the `getDateTimeDataType` method above to determine the precise date type. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
