exceptionfactory commented on code in PR #7194:
URL: https://github.com/apache/nifi/pull/7194#discussion_r1199111371


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nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/main/java/org/apache/nifi/excel/RowIterator.java:
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@@ -0,0 +1,155 @@
+/*
+ * 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 com.github.pjfanning.xlsx.StreamingReader;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class RowIterator implements Iterator<Row>, Closeable {
+    private final Workbook workbook;
+    private final Iterator<Sheet> sheets;
+    private Sheet currentSheet;
+    private Iterator<Row> currentRows;
+    private final Map<String, Boolean> desiredSheets;
+    private final int firstRow;
+    private ComponentLog logger;
+    private boolean log;
+    private Row currentRow;
+
+    public RowIterator(InputStream in, List<String> desiredSheets, int 
firstRow) {
+        this(in, desiredSheets, firstRow, null);
+    }
+
+    public RowIterator(InputStream in, List<String> desiredSheets, int 
firstRow, ComponentLog logger) {
+        this.workbook = StreamingReader.builder()
+                .rowCacheSize(100)
+                .bufferSize(4096)
+                .open(in);
+        this.sheets = this.workbook.iterator();
+        this.desiredSheets = desiredSheets != null ? desiredSheets.stream()
+                .collect(Collectors.toMap(key -> key, value -> Boolean.FALSE)) 
: new HashMap<>();
+        this.firstRow = firstRow;
+        this.logger = logger;
+        this.log = logger != null;
+    }
+
+    @Override
+    public boolean hasNext() {
+        setCurrent();
+        boolean next = currentRow != null;
+        if(!next) {
+            String sheetsNotFound = getSheetsNotFound(desiredSheets);
+            if (!sheetsNotFound.isEmpty() && log) {
+                logger.warn("Excel sheet(s) not found: {}", sheetsNotFound);
+            }

Review Comment:
   It could be something else, probably `ProcessException` would be a good 
option as a more specific subclass of `RuntimeException`.



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