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:
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@@ -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.



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