exceptionfactory commented on code in PR #7194: URL: https://github.com/apache/nifi/pull/7194#discussion_r1195809425
########## nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/main/java/org/apache/nifi/excel/ExcelRecordReader.java: ########## @@ -0,0 +1,221 @@ +/* + * 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.logging.ComponentLog; +import org.apache.nifi.serialization.MalformedRecordException; +import org.apache.nifi.serialization.RecordReader; +import org.apache.nifi.serialization.record.DataType; +import org.apache.nifi.serialization.record.MapRecord; +import org.apache.nifi.serialization.record.Record; +import org.apache.nifi.serialization.record.RecordField; +import org.apache.nifi.serialization.record.RecordSchema; +import org.apache.nifi.serialization.record.util.DataTypeUtils; +import org.apache.poi.ss.usermodel.Cell; +import org.apache.poi.ss.usermodel.DateUtil; +import org.apache.poi.ss.usermodel.Row; + +import java.io.IOException; +import java.text.DateFormat; +import java.util.ArrayList; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.function.Supplier; +import java.util.stream.IntStream; + +import static org.apache.commons.lang3.StringUtils.isEmpty; + +public class ExcelRecordReader implements RecordReader { + private final RowIterator rowIterator; + private ComponentLog logger; + private final RecordSchema schema; + private final List<String> desiredSheets; + private final Supplier<DateFormat> LAZY_DATE_FORMAT; + private final Supplier<DateFormat> LAZY_TIME_FORMAT; + private final Supplier<DateFormat> LAZY_TIMESTAMP_FORMAT; + private final String dateFormat; + private final String timeFormat; + private final String timestampFormat; + + public ExcelRecordReader(ExcelRecordReaderArgs args) throws MalformedRecordException { + this.logger = args.getLogger(); + this.schema = args.getSchema(); + this.desiredSheets = new ArrayList<>(); + if (args.getDesiredSheets() != null && args.getDesiredSheets().length() > 0) { + IntStream.range(0, args.getDesiredSheets().length()) + .forEach(index -> this.desiredSheets.add(args.getDesiredSheets().get(index))); + } + + if (isEmpty(args.getDateFormat())) { + this.dateFormat = null; + LAZY_DATE_FORMAT = null; + } else { + this.dateFormat = args.getDateFormat(); + LAZY_DATE_FORMAT = () -> DataTypeUtils.getDateFormat(dateFormat); + } + + if (isEmpty(args.getTimeFormat())) { + this.timeFormat = null; + LAZY_TIME_FORMAT = null; + } else { + this.timeFormat = args.getTimeFormat(); + LAZY_TIME_FORMAT = () -> DataTypeUtils.getDateFormat(timeFormat); + } + + if (isEmpty(args.getTimestampFormat())) { + this.timestampFormat = null; + LAZY_TIMESTAMP_FORMAT = null; + } else { + this.timestampFormat = args.getTimestampFormat(); + LAZY_TIMESTAMP_FORMAT = () -> DataTypeUtils.getDateFormat(timestampFormat); + } + + try { + this.rowIterator = new RowIterator(args.getInputStream(), desiredSheets, args.getFirstRow(), logger); + } catch (RuntimeException e) { + String msg = "Error occurred while processing record file"; + logger.error(msg, e); + throw new MalformedRecordException(msg, e); + } + } + + @Override + public Record nextRecord(boolean coerceTypes, boolean dropUnknownFields) throws IOException, MalformedRecordException { + try { + if (rowIterator.hasNext()) { + Row currentRow = rowIterator.next(); + Map<String, Object> currentRowValues = getCurrentRowValues(currentRow, coerceTypes, dropUnknownFields); + return new MapRecord(schema, currentRowValues); + } + } catch (Exception e) { + throw new MalformedRecordException("Error while getting next record", e); + } + return null; + } + + private Map<String, Object> getCurrentRowValues(Row currentRow, boolean coerceTypes, boolean dropUnknownFields) { + final List<RecordField> recordFields = schema.getFields(); + final Map<String, Object> currentRowValues = new LinkedHashMap<>(); + + if (ExcelUtils.hasCells(currentRow)) { + IntStream.range(0, currentRow.getLastCellNum()) + .forEach(index -> { + Cell cell = currentRow.getCell(index); + Object cellValue; + if (index >= recordFields.size()) { + if (!dropUnknownFields) { + cellValue = getCellValue(cell); + currentRowValues.put("unknown_field_index_" + index, cellValue); + } + } else { + final RecordField recordField = recordFields.get(index); + String fieldName = recordField.getFieldName(); + DataType dataType = recordField.getDataType(); + cellValue = getCellValue(cell); + final Object value = coerceTypes ? convert(cellValue, dataType, fieldName) + : convertSimpleIfPossible(cellValue, dataType, fieldName); + currentRowValues.put(fieldName, value); + } + }); + } + + return currentRowValues; + } + + public static Object getCellValue(Cell cell) { + if (cell != null) { + switch (cell.getCellType()) { + case _NONE: + case BLANK: + case ERROR: + case FORMULA: + case STRING: + return cell.getStringCellValue(); + case NUMERIC: + return DateUtil.isCellDateFormatted(cell) ? cell.getDateCellValue() : cell.getNumericCellValue(); + case BOOLEAN: + return cell.getBooleanCellValue(); + } + } + return null; + } + + private Object convert(final Object value, final DataType dataType, final String fieldName) { + if (value == null || dataType == null) { + return value; + } + + return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName); + } + + private Object convertSimpleIfPossible(final Object value, final DataType dataType, final String fieldName) { + if (value == null || dataType == null) { + return value; + } + + switch (dataType.getFieldType()) { + case STRING: + return value; + case BOOLEAN: + case INT: + case LONG: + case FLOAT: + case DOUBLE: + case DECIMAL: + case BYTE: + case CHAR: + case SHORT: + if (DataTypeUtils.isCompatibleDataType(value, dataType)) { + return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName); + } + break; + case DATE: + if (DataTypeUtils.isDateTypeCompatible(value, dateFormat)) { + return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName); + } + break; + case TIME: + if (DataTypeUtils.isTimeTypeCompatible(value, timeFormat)) { + return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName); + } + break; + case TIMESTAMP: + if (DataTypeUtils.isTimestampTypeCompatible(value, timestampFormat)) { + return DataTypeUtils.convertType(value, dataType, LAZY_DATE_FORMAT, LAZY_TIME_FORMAT, LAZY_TIMESTAMP_FORMAT, fieldName); + } + break; + } + + return value; + } + + @Override + public RecordSchema getSchema() throws MalformedRecordException { + return schema; + } + + @Override + public void close() throws IOException { + this.rowIterator.close(); + } + + void setLogger(ComponentLog logger) { Review Comment: You can use the `NoOpProcessor.class`. See [StandardPrivateKeyServiceTest](https://github.com/apache/nifi/blob/607b53504b57d5d7fde84a721ce75056c92a1f70/nifi-nar-bundles/nifi-standard-services/nifi-key-service-bundle/nifi-key-service/src/test/java/org/apache/nifi/key/service/StandardPrivateKeyServiceTest.java) as an example. -- 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: issues-unsubscr...@nifi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
