Make lower/upper casing locale independent

DEVSIX-9092

Author: vitali-pr

pdfocr-tesseract4/src/main/java/com/itextpdf/pdfocr/tesseract4/AbstractTesseract4OcrEngine.java

@@ -27,6 +27,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.commons.actions.contexts.IMetaInfo;
 import com.itextpdf.commons.actions.data.ProductData;
 import com.itextpdf.commons.utils.MessageFormatUtil;
+import com.itextpdf.commons.utils.StringNormalizer;
 import com.itextpdf.io.image.ImageType;
 import com.itextpdf.pdfocr.AbstractPdfOcrEventHelper;
 import com.itextpdf.pdfocr.IOcrEngine;
@@ -315,7 +316,7 @@ public final String doImageOcr(final File input,
      * @return boolean true is current os is windows, otherwise - false
      */
     public boolean isWindows() {
-        return identifyOsType().toLowerCase().contains("win");
+        return StringNormalizer.toLowerCase(identifyOsType()).contains("win");
     }
 
     /**
@@ -326,7 +327,7 @@ public boolean isWindows() {
     public String identifyOsType() {
         String os = System.getProperty("os.name") == null
                 ? System.getProperty("OS") : System.getProperty("os.name");
-        return os.toLowerCase();
+        return StringNormalizer.toLowerCase(os);
     }
 
     /**

pdfocr-tesseract4/src/main/java/com/itextpdf/pdfocr/tesseract4/Tesseract4ExecutableOcrEngine.java

@@ -25,6 +25,12 @@ This file is part of the iText (R) project.
 import com.itextpdf.commons.actions.confirmations.ConfirmEvent;
 import com.itextpdf.commons.actions.confirmations.EventConfirmationType;
 import com.itextpdf.commons.utils.MessageFormatUtil;
+import com.itextpdf.commons.utils.StringNormalizer;
+import com.itextpdf.pdfocr.AbstractPdfOcrEventHelper;
+import com.itextpdf.pdfocr.tesseract4.actions.events.PdfOcrTesseract4ProductEvent;
+import com.itextpdf.pdfocr.tesseract4.exceptions.PdfOcrTesseract4Exception;
+import com.itextpdf.pdfocr.tesseract4.exceptions.PdfOcrTesseract4ExceptionMessageConstant;
+import com.itextpdf.pdfocr.tesseract4.logs.Tesseract4LogMessageConstant;
 
 import java.awt.image.BufferedImage;
 import java.io.File;
@@ -35,13 +41,6 @@ This file is part of the iText (R) project.
 import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
-
-import com.itextpdf.pdfocr.AbstractPdfOcrEventHelper;
-import com.itextpdf.pdfocr.tesseract4.actions.events.PdfOcrTesseract4ProductEvent;
-import com.itextpdf.pdfocr.tesseract4.exceptions.PdfOcrTesseract4Exception;
-import com.itextpdf.pdfocr.tesseract4.exceptions.PdfOcrTesseract4ExceptionMessageConstant;
-import com.itextpdf.pdfocr.tesseract4.logs.Tesseract4LogMessageConstant;
-
 import net.sourceforge.lept4j.Pix;
 import org.slf4j.LoggerFactory;
 
@@ -478,7 +477,7 @@ private String getExtension(File inputImage) {
                 String extension = new String(
                         inputImage.getAbsolutePath().toCharArray(), index,
                         inputImage.getAbsolutePath().length() - index);
-                return extension.toLowerCase();
+                return StringNormalizer.toLowerCase(extension);
             }
         }
         return ".png";

pdfocr-tesseract4/src/main/java/com/itextpdf/pdfocr/tesseract4/Tesseract4OcrEngineProperties.java

@@ -24,6 +24,7 @@ This file is part of the iText (R) project.
 
 import com.itextpdf.commons.utils.FileUtil;
 import com.itextpdf.commons.utils.MessageFormatUtil;
+import com.itextpdf.commons.utils.StringNormalizer;
 import com.itextpdf.pdfocr.IOcrEngine;
 import com.itextpdf.pdfocr.OcrEngineProperties;
 import com.itextpdf.pdfocr.tesseract4.exceptions.PdfOcrTesseract4Exception;
@@ -328,7 +329,7 @@ Tesseract4OcrEngineProperties setUserWords(final String language,
             final InputStream inputStream) throws PdfOcrTesseract4Exception {
         setPathToUserWordsFile(null);
         if (!getLanguages().contains(language)) {
-            if (DEFAULT_LANGUAGE.equals(language.toLowerCase())) {
+            if (DEFAULT_LANGUAGE.equals(StringNormalizer.toLowerCase(language))) {
                 List<String> languagesList = getLanguages();
                 languagesList.add(language);
                 setLanguages(languagesList);

pdfocr-tesseract4/src/test/java/com/itextpdf/pdfocr/imageformats/ImageFormatIntegrationTest.java

@@ -23,6 +23,7 @@ This file is part of the iText (R) project.
 package com.itextpdf.pdfocr.imageformats;
 
 import com.itextpdf.commons.utils.MessageFormatUtil;
+import com.itextpdf.commons.utils.StringNormalizer;
 import com.itextpdf.kernel.colors.DeviceCmyk;
 import com.itextpdf.kernel.utils.CompareTool;
 import com.itextpdf.pdfocr.IntegrationTestHelper;
@@ -49,7 +50,7 @@ public abstract class ImageFormatIntegrationTest extends IntegrationTestHelper {
 
     public ImageFormatIntegrationTest(ReaderType type) {
         tesseractReader = getTesseractReader(type);
-        this.testType = type.toString().toLowerCase();
+        this.testType = StringNormalizer.toLowerCase(type.toString());
     }
 
     @BeforeEach