Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

libraries-data-io/README.md

@@ -0,0 +1,11 @@
+## IO Data Libraries
+
+This module contains articles about IO data processing libraries.
+
+### Relevant articles
+- [Introduction To Kryo](https://www.baeldung.com/kryo)
+- [Parsing YAML with SnakeYAML](https://www.baeldung.com/java-snake-yaml)
+- [Introduction to Smooks](https://www.baeldung.com/smooks)
+- [Introduction To OpenCSV](https://www.baeldung.com/opencsv)
+- [Interact with Google Sheets from Java](https://www.baeldung.com/google-sheets-java-client)
+- [Introduction To Docx4J](https://www.baeldung.com/docx4j)

libraries-data-io/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>libraries-data-io</artifactId>
+    <name>libraries-data-io</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.esotericsoftware</groupId>
+            <artifactId>kryo</artifactId>
+            <version>${kryo.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.yaml</groupId>
+            <artifactId>snakeyaml</artifactId>
+            <version>${snakeyaml.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.milyn</groupId>
+            <artifactId>milyn-smooks-all</artifactId>
+            <version>${smooks.version}</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/com.opencsv/opencsv -->
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+            <version>${opencsv.version}</version>
+        </dependency>
+        <!-- google api -->
+        <dependency>
+            <groupId>com.google.api-client</groupId>
+            <artifactId>google-api-client</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.oauth-client</groupId>
+            <artifactId>google-oauth-client-jetty</artifactId>
+            <version>${google-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.apis</groupId>
+            <artifactId>google-api-services-sheets</artifactId>
+            <version>${google-sheets.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>${jaxb-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.docx4j</groupId>
+            <artifactId>docx4j</artifactId>
+            <version>${docx4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${org.assertj.core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <snakeyaml.version>1.21</snakeyaml.version>
+        <kryo.version>4.0.1</kryo.version>
+        <smooks.version>1.7.0</smooks.version>
+        <opencsv.version>4.1</opencsv.version>
+        <google-api.version>1.23.0</google-api.version>
+        <google-sheets.version>v4-rev493-1.21.0</google-sheets.version>
+        <org.assertj.core.version>3.9.0</org.assertj.core.version>
+        <docx4j.version>3.3.5</docx4j.version>
+        <jaxb-api.version>2.1</jaxb-api.version>
+    </properties>
+</project>

libraries-data-io/src/main/java/com/baeldung/libraries/docx/Docx4jExample.java

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+package com.baeldung.libraries.docx;
+
+import org.docx4j.dml.wordprocessingDrawing.Inline;
+import org.docx4j.jaxb.Context;
+import org.docx4j.model.table.TblFactory;
+import org.docx4j.openpackaging.exceptions.Docx4JException;
+import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
+import org.docx4j.openpackaging.parts.WordprocessingML.BinaryPartAbstractImage;
+import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
+import org.docx4j.wml.*;
+
+import javax.xml.bind.JAXBElement;
+import javax.xml.bind.JAXBException;
+import java.io.File;
+import java.nio.file.Files;
+import java.util.List;
+
+class Docx4jExample {
+
+    void createDocumentPackage(String outputPath, String imagePath) throws Exception {
+        WordprocessingMLPackage wordPackage = WordprocessingMLPackage.createPackage();
+        MainDocumentPart mainDocumentPart = wordPackage.getMainDocumentPart();
+        mainDocumentPart.addStyledParagraphOfText("Title", "Hello World!");
+        mainDocumentPart.addParagraphOfText("Welcome To Baeldung!");
+
+        ObjectFactory factory = Context.getWmlObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        Text t = factory.createText();
+        t.setValue("Welcome To Baeldung");
+        r.getContent().add(t);
+        p.getContent().add(r);
+        RPr rpr = factory.createRPr();
+        BooleanDefaultTrue b = new BooleanDefaultTrue();
+        rpr.setB(b);
+        rpr.setI(b);
+        rpr.setCaps(b);
+        Color red = factory.createColor();
+        red.setVal("green");
+        rpr.setColor(red);
+        r.setRPr(rpr);
+        mainDocumentPart.getContent().add(p);
+
+        File image = new File(imagePath);
+        byte[] fileContent = Files.readAllBytes(image.toPath());
+        BinaryPartAbstractImage imagePart = BinaryPartAbstractImage.createImagePart(wordPackage, fileContent);
+        Inline inline = imagePart.createImageInline("Baeldung Image", "Alt Text", 1, 2, false);
+        P Imageparagraph = addImageToParagraph(inline);
+        mainDocumentPart.getContent().add(Imageparagraph);
+
+        int writableWidthTwips = wordPackage.getDocumentModel().getSections().get(0).getPageDimensions().getWritableWidthTwips();
+        int columnNumber = 3;
+        Tbl tbl = TblFactory.createTable(3, 3, writableWidthTwips / columnNumber);
+        List<Object> rows = tbl.getContent();
+        for (Object row : rows) {
+            Tr tr = (Tr) row;
+            List<Object> cells = tr.getContent();
+            for (Object cell : cells) {
+                Tc td = (Tc) cell;
+                td.getContent().add(p);
+            }
+        }
+
+        mainDocumentPart.getContent().add(tbl);
+        File exportFile = new File(outputPath);
+        wordPackage.save(exportFile);
+    }
+
+    boolean isTextExist(String testText) throws Docx4JException, JAXBException {
+        File doc = new File("helloWorld.docx");
+        WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(doc);
+        MainDocumentPart mainDocumentPart = wordMLPackage.getMainDocumentPart();
+        String textNodesXPath = "//w:t";
+        List<Object> paragraphs = mainDocumentPart.getJAXBNodesViaXPath(textNodesXPath, true);
+        for (Object obj : paragraphs) {
+            Text text = (Text) ((JAXBElement) obj).getValue();
+            String textValue = text.getValue();
+            if (textValue != null && textValue.contains(testText)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static P addImageToParagraph(Inline inline) {
+        ObjectFactory factory = new ObjectFactory();
+        P p = factory.createP();
+        R r = factory.createR();
+        p.getContent().add(r);
+        Drawing drawing = factory.createDrawing();
+        r.getContent().add(drawing);
+        drawing.getAnchorOrInline().add(inline);
+        return p;
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/kryo/ComplexClass.java

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+package com.baeldung.libraries.kryo;
+
+import java.io.Serializable;
+
+public class ComplexClass implements Serializable{
+    private static final long serialVersionUID = 123456L;
+    private String name = "Bael";
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/kryo/Person.java

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+package com.baeldung.libraries.kryo;
+
+import com.esotericsoftware.kryo.DefaultSerializer;
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.KryoSerializable;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+
+import java.util.Date;
+
+@DefaultSerializer(PersonSerializer.class)
+public class Person implements KryoSerializable {
+    private String name = "John Doe";
+    private int age = 18;
+    private Date birthDate = new Date(933191282821L);
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public Date getBirthDate() {
+        return birthDate;
+    }
+
+    public void setBirthDate(Date birthDate) {
+        this.birthDate = birthDate;
+    }
+
+    @Override
+    public void write(Kryo kryo, Output output) {
+        output.writeString(name);
+        output.writeLong(birthDate.getTime());
+        output.writeInt(age);
+    }
+
+    @Override
+    public void read(Kryo kryo, Input input) {
+        name = input.readString();
+        birthDate = new Date(input.readLong());
+        age = input.readInt();
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/kryo/PersonSerializer.java

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+package com.baeldung.libraries.kryo;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+
+import java.util.Date;
+
+public class PersonSerializer extends Serializer<Person> {
+
+    @Override
+    public void write(Kryo kryo, Output output, Person object) {
+        output.writeString(object.getName());
+        output.writeLong(object.getBirthDate()
+            .getTime());
+    }
+
+    @Override
+    public Person read(Kryo kryo, Input input, Class<Person> type) {
+        Person person = new Person();
+        person.setName(input.readString());
+        long birthDate = input.readLong();
+        person.setBirthDate(new Date(birthDate));
+        person.setAge(calculateAge(birthDate));
+        return person;
+    }
+
+    private int calculateAge(long birthDate) {
+        // Some custom logic
+        return 18;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/Application.java

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+package com.baeldung.libraries.opencsv;
+
+import com.baeldung.libraries.opencsv.beans.NamedColumnBean;
+import com.baeldung.libraries.opencsv.beans.SimplePositionBean;
+import com.baeldung.libraries.opencsv.examples.sync.BeanExamples;
+import com.baeldung.libraries.opencsv.examples.sync.CsvReaderExamples;
+import com.baeldung.libraries.opencsv.examples.sync.CsvWriterExamples;
+import com.baeldung.libraries.opencsv.helpers.Helpers;
+
+import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Application {
+
+        /*
+         *  Bean Examples.
+         */
+
+    public static String simpleSyncPositionBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.twoColumnCsvPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.beanBuilderExample(path, SimplePositionBean.class).toString();
+    }
+
+    public static String namedSyncColumnBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.namedColumnCsvPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.beanBuilderExample(path, NamedColumnBean.class).toString();
+    }
+
+    public static String writeSyncCsvFromBeanExample() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutBeanPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return BeanExamples.writeCsvFromBean(path);
+    }
+
+        /*
+         *  CSV Reader Examples.
+         */
+
+    public static String oneByOneSyncExample() {
+        Reader reader = null;
+        try {
+            reader = Files.newBufferedReader(Helpers.twoColumnCsvPath());
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvReaderExamples.oneByOne(reader).toString();
+    }
+
+    public static String readAllSyncExample() {
+        Reader reader = null;
+        try {
+            reader = Files.newBufferedReader(Helpers.twoColumnCsvPath());
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvReaderExamples.readAll(reader).toString();
+    }
+
+         /*
+         *  CSV Writer Examples.
+         */
+
+
+    public static String csvWriterSyncOneByOne() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutOnePath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvWriterExamples.csvWriterOneByOne(Helpers.fourColumnCsvString(), path);
+    }
+
+    public static String csvWriterSyncAll() {
+        Path path = null;
+        try {
+            path = Helpers.fileOutAllPath();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return CsvWriterExamples.csvWriterAll(Helpers.fourColumnCsvString(), path);
+    }
+
+    public static void main(String[] args) {
+        simpleSyncPositionBeanExample();
+        namedSyncColumnBeanExample();
+        writeSyncCsvFromBeanExample();
+        oneByOneSyncExample();
+        readAllSyncExample();
+        csvWriterSyncOneByOne();
+        csvWriterSyncAll();
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/Constants.java

@@ -0,0 +1,17 @@
+package com.baeldung.libraries.opencsv;
+
+public class Constants {
+
+    public static final String GENERIC_EXCEPTION = "EXCEPTION ENCOUNTERED: ";
+    public static final String GENERIC_SUCCESS = "SUCCESS";
+
+    public static final String TWO_COLUMN_CSV = "csv/twoColumn.csv";
+    public static final String FOUR_COLUMN_CSV = "csv/fourColumn.csv";
+    public static final String NAMED_COLUMN_CSV = "csv/namedColumn.csv";
+
+    public static final String CSV_All = "csv/writtenAll.csv";
+    public static final String CSV_BEAN = "csv/writtenBean.csv";
+    public static final String CSV_ONE = "csv/writtenOneByOne.csv";
+
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/beans/CsvBean.java

@@ -0,0 +1,3 @@
+package com.baeldung.libraries.opencsv.beans;
+
+public class CsvBean { }

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/beans/NamedColumnBean.java

@@ -0,0 +1,31 @@
+package com.baeldung.libraries.opencsv.beans;
+
+import com.opencsv.bean.CsvBindByName;
+
+public class NamedColumnBean extends CsvBean {
+
+    @CsvBindByName(column = "name")
+    private String name;
+
+    //Automatically infer column name as Age
+    @CsvBindByName
+    private int age;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/beans/SimplePositionBean.java

@@ -0,0 +1,29 @@
+package com.baeldung.libraries.opencsv.beans;
+
+import com.opencsv.bean.CsvBindByPosition;
+
+public class SimplePositionBean extends CsvBean {
+
+    @CsvBindByPosition(position = 0)
+    private String exampleColOne;
+
+    @CsvBindByPosition(position = 1)
+    private String exampleColTwo;
+
+    public String getExampleColOne() {
+        return exampleColOne;
+    }
+
+    private void setExampleColOne(String exampleColOne) {
+        this.exampleColOne = exampleColOne;
+    }
+
+    public String getExampleColTwo() {
+        return exampleColTwo;
+    }
+
+    private void setExampleCsvTwo (String exampleColTwo) {
+        this.exampleColTwo = exampleColTwo;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/beans/WriteExampleBean.java

@@ -0,0 +1,40 @@
+package com.baeldung.libraries.opencsv.beans;
+
+public class WriteExampleBean extends CsvBean {
+
+    private String colA;
+
+    private String colB;
+
+    private String colC;
+
+    public WriteExampleBean(String colA, String colB, String colC) {
+        this.colA = colA;
+        this.colB = colB;
+        this.colC = colC;
+    }
+
+    public String getColA() {
+        return colA;
+    }
+
+    public void setColA(String colA) {
+        this.colA = colA;
+    }
+
+    public String getColB() {
+        return colB;
+    }
+
+    public void setColB(String colB) {
+        this.colB = colB;
+    }
+
+    public String getColC() {
+        return colC;
+    }
+
+    public void setColC(String colC) {
+        this.colC = colC;
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/examples/sync/BeanExamples.java

@@ -0,0 +1,63 @@
+package com.baeldung.libraries.opencsv.examples.sync;
+
+import com.baeldung.libraries.opencsv.beans.CsvBean;
+import com.baeldung.libraries.opencsv.beans.WriteExampleBean;
+import com.baeldung.libraries.opencsv.helpers.Helpers;
+import com.baeldung.libraries.opencsv.pojos.CsvTransfer;
+import com.opencsv.CSVWriter;
+import com.opencsv.bean.*;
+
+import java.io.FileWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BeanExamples {
+
+    public static List<CsvBean> beanBuilderExample(Path path, Class clazz) {
+        ColumnPositionMappingStrategy ms = new ColumnPositionMappingStrategy();
+        return beanBuilderExample(path, clazz, ms);
+    }
+
+    public static List<CsvBean> beanBuilderExample(Path path, Class clazz, MappingStrategy ms) {
+        CsvTransfer csvTransfer = new CsvTransfer();
+        try {
+            ms.setType(clazz);
+
+            Reader reader = Files.newBufferedReader(path);
+            CsvToBean cb = new CsvToBeanBuilder(reader).withType(clazz)
+                .withMappingStrategy(ms)
+                .build();
+
+            csvTransfer.setCsvList(cb.parse());
+            reader.close();
+
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return csvTransfer.getCsvList();
+    }
+
+    public static String writeCsvFromBean(Path path) {
+        try {
+            Writer writer = new FileWriter(path.toString());
+
+            StatefulBeanToCsv sbc = new StatefulBeanToCsvBuilder(writer).withSeparator(CSVWriter.DEFAULT_SEPARATOR)
+                .build();
+
+            List<CsvBean> list = new ArrayList<>();
+            list.add(new WriteExampleBean("Test1", "sfdsf", "fdfd"));
+            list.add(new WriteExampleBean("Test2", "ipso", "facto"));
+
+            sbc.write(list);
+            writer.close();
+
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/examples/sync/CsvReaderExamples.java

@@ -0,0 +1,63 @@
+package com.baeldung.libraries.opencsv.examples.sync;
+
+import com.baeldung.libraries.opencsv.helpers.Helpers;
+import com.opencsv.CSVParser;
+import com.opencsv.CSVParserBuilder;
+import com.opencsv.CSVReader;
+import com.opencsv.CSVReaderBuilder;
+
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CsvReaderExamples {
+
+    public static List<String[]> readAll(Reader reader) {
+
+        CSVParser parser = new CSVParserBuilder()
+                .withSeparator(',')
+                .withIgnoreQuotations(true)
+                .build();
+
+        CSVReader csvReader = new CSVReaderBuilder(reader)
+                .withSkipLines(0)
+                .withCSVParser(parser)
+                .build();
+
+        List<String[]> list = new ArrayList<>();
+        try {
+            list = csvReader.readAll();
+            reader.close();
+            csvReader.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return list;
+    }
+
+    public static List<String[]> oneByOne(Reader reader) {
+        List<String[]> list = new ArrayList<>();
+        try {
+            CSVParser parser = new CSVParserBuilder()
+                    .withSeparator(',')
+                    .withIgnoreQuotations(true)
+                    .build();
+
+            CSVReader csvReader = new CSVReaderBuilder(reader)
+                    .withSkipLines(0)
+                    .withCSVParser(parser)
+                    .build();
+
+            String[] line;
+            while ((line = csvReader.readNext()) != null) {
+                list.add(line);
+            }
+            reader.close();
+            csvReader.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return list;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/examples/sync/CsvWriterExamples.java

@@ -0,0 +1,35 @@
+package com.baeldung.libraries.opencsv.examples.sync;
+
+import com.baeldung.libraries.opencsv.helpers.Helpers;
+import com.opencsv.CSVWriter;
+
+import java.io.FileWriter;
+import java.nio.file.Path;
+import java.util.List;
+
+public class CsvWriterExamples {
+
+    public static String csvWriterOneByOne(List<String[]> stringArray, Path path) {
+        try {
+            CSVWriter writer = new CSVWriter(new FileWriter(path.toString()));
+            for (String[] array : stringArray) {
+                writer.writeNext(array);
+            }
+            writer.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+
+    public static String csvWriterAll(List<String[]> stringArray, Path path) {
+        try {
+            CSVWriter writer = new CSVWriter(new FileWriter(path.toString()));
+            writer.writeAll(stringArray);
+            writer.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return Helpers.readFile(path);
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/helpers/Helpers.java

@@ -0,0 +1,108 @@
+package com.baeldung.libraries.opencsv.helpers;
+
+import com.baeldung.libraries.opencsv.Constants;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Helpers {
+
+    /**
+     * Write Files
+     */
+
+    public static Path fileOutAllPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_All).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fileOutBeanPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_BEAN).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fileOutOnePath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.CSV_ONE).toURI();
+        return Paths.get(uri);
+    }
+
+    /**
+     * Read Files
+     */
+
+    public static Path twoColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.TWO_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path fourColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.FOUR_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    public static Path namedColumnCsvPath() throws URISyntaxException {
+        URI uri = ClassLoader.getSystemResource(Constants.NAMED_COLUMN_CSV).toURI();
+        return Paths.get(uri);
+    }
+
+    /**
+     * Simple File Reader
+     */
+
+    public static String readFile(Path path) {
+        String response = "";
+        try {
+            FileReader fr = new FileReader(path.toString());
+            BufferedReader br = new BufferedReader(fr);
+            String strLine;
+            StringBuffer sb = new StringBuffer();
+            while ((strLine = br.readLine()) != null) {
+                sb.append(strLine);
+            }
+            response = sb.toString();
+            System.out.println(response);
+            fr.close();
+            br.close();
+        } catch (Exception ex) {
+            Helpers.err(ex);
+        }
+        return response;
+    }
+
+    /**
+     * Dummy Data for Writing.
+     */
+
+    public static List<String[]> twoColumnCsvString() {
+        List<String[]> list = new ArrayList<>();
+        list.add(new String[]{"ColA", "ColB"});
+        list.add(new String[]{"A", "B"});
+        return list;
+    }
+
+    public static List<String[]> fourColumnCsvString() {
+        List<String[]> list = new ArrayList<>();
+        list.add(new String[]{"ColA", "ColB", "ColC", "ColD"});
+        list.add(new String[]{"A", "B", "A", "B"});
+        list.add(new String[]{"BB", "AB", "AA", "B"});
+        return list;
+    }
+
+    /**
+     * Message Helpers
+     */
+
+    public static void print(String msg) {
+        System.out.println(msg);
+    }
+
+    public static void err(Exception ex) {
+        System.out.println(Constants.GENERIC_EXCEPTION + " " + ex);
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/opencsv/pojos/CsvTransfer.java

@@ -0,0 +1,38 @@
+package com.baeldung.libraries.opencsv.pojos;
+
+import com.baeldung.libraries.opencsv.beans.CsvBean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CsvTransfer {
+
+    private List<String[]> csvStringList;
+
+    private List<CsvBean> csvList;
+
+    public CsvTransfer() {}
+
+    public List<String[]> getCsvStringList() {
+        if (csvStringList != null) return csvStringList;
+        return new ArrayList<String[]>();
+    }
+
+    public void addLine(String[] line) {
+        if (this.csvList == null) this.csvStringList = new ArrayList<>();
+        this.csvStringList.add(line);
+    }
+
+    public void setCsvStringList(List<String[]> csvStringList) {
+        this.csvStringList = csvStringList;
+    }
+
+    public void setCsvList(List<CsvBean> csvList) {
+        this.csvList = csvList;
+    }
+
+    public List<CsvBean> getCsvList() {
+        if (csvList != null) return csvList;
+        return new ArrayList<CsvBean>();
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/sheets/GoogleAuthorizeUtil.java

@@ -0,0 +1,34 @@
+package com.baeldung.libraries.sheets;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
+import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
+import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
+import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.client.util.store.MemoryDataStoreFactory;
+import com.google.api.services.sheets.v4.SheetsScopes;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.security.GeneralSecurityException;
+import java.util.Arrays;
+import java.util.List;
+
+public class GoogleAuthorizeUtil {
+    public static Credential authorize() throws IOException, GeneralSecurityException {
+        InputStream in = GoogleAuthorizeUtil.class.getResourceAsStream("/google-sheets-client-secret.json");
+        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JacksonFactory.getDefaultInstance(), new InputStreamReader(in));
+
+        List<String> scopes = Arrays.asList(SheetsScopes.SPREADSHEETS);
+
+        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(GoogleNetHttpTransport.newTrustedTransport(), JacksonFactory.getDefaultInstance(), clientSecrets, scopes).setDataStoreFactory(new MemoryDataStoreFactory())
+                .setAccessType("offline").build();
+        Credential credential = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
+
+        return credential;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/sheets/SheetsServiceUtil.java

@@ -0,0 +1,20 @@
+package com.baeldung.libraries.sheets;
+
+import com.google.api.client.auth.oauth2.Credential;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.services.sheets.v4.Sheets;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+public class SheetsServiceUtil {
+
+    private static final String APPLICATION_NAME = "Google Sheets Example";
+
+    public static Sheets getSheetsService() throws IOException, GeneralSecurityException {
+        Credential credential = GoogleAuthorizeUtil.authorize();
+        return new Sheets.Builder(GoogleNetHttpTransport.newTrustedTransport(), JacksonFactory.getDefaultInstance(), credential).setApplicationName(APPLICATION_NAME).build();
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/converter/OrderConverter.java

@@ -0,0 +1,44 @@
+package com.baeldung.libraries.smooks.converter;
+
+import com.baeldung.libraries.smooks.model.Order;
+import org.milyn.Smooks;
+import org.milyn.payload.JavaResult;
+import org.milyn.payload.StringResult;
+import org.xml.sax.SAXException;
+
+import javax.xml.transform.stream.StreamSource;
+import java.io.IOException;
+
+public class OrderConverter {
+
+    public Order convertOrderXMLToOrderObject(String path) throws IOException, SAXException {
+        Smooks smooks = new Smooks(OrderConverter.class.getResourceAsStream("/smooks/smooks-mapping.xml"));
+        try {
+            JavaResult javaResult = new JavaResult();
+            smooks.filterSource(new StreamSource(OrderConverter.class.getResourceAsStream(path)), javaResult);
+            return (Order) javaResult.getBean("order");
+        } finally {
+            smooks.close();
+        }
+    }
+
+    public String convertOrderXMLtoEDIFACT(String path) throws IOException, SAXException {
+        return convertDocumentWithTempalte(path, "/smooks/smooks-transform-edi.xml");
+    }
+
+    public String convertOrderXMLtoEmailMessage(String path) throws IOException, SAXException {
+        return convertDocumentWithTempalte(path, "/smooks/smooks-transform-email.xml");
+    }
+
+    private String convertDocumentWithTempalte(String path, String config) throws IOException, SAXException {
+        Smooks smooks = new Smooks(config);
+
+        try {
+            StringResult stringResult = new StringResult();
+            smooks.filterSource(new StreamSource(OrderConverter.class.getResourceAsStream(path)), stringResult);
+            return stringResult.toString();
+        } finally {
+            smooks.close();
+        }
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/converter/OrderValidator.java

@@ -0,0 +1,27 @@
+package com.baeldung.libraries.smooks.converter;
+
+import org.milyn.Smooks;
+import org.milyn.payload.JavaResult;
+import org.milyn.payload.StringResult;
+import org.milyn.validation.ValidationResult;
+import org.xml.sax.SAXException;
+
+import javax.xml.transform.stream.StreamSource;
+import java.io.IOException;
+
+public class OrderValidator {
+
+    public ValidationResult validate(String path) throws IOException, SAXException {
+        Smooks smooks = new Smooks(OrderValidator.class.getResourceAsStream("/smooks/smooks-validation.xml"));
+
+        try {
+            StringResult xmlResult = new StringResult();
+            JavaResult javaResult = new JavaResult();
+            ValidationResult validationResult = new ValidationResult();
+            smooks.filterSource(new StreamSource(OrderValidator.class.getResourceAsStream(path)), xmlResult, javaResult, validationResult);
+            return validationResult;
+        } finally {
+            smooks.close();
+        }
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/model/Item.java

@@ -0,0 +1,70 @@
+package com.baeldung.libraries.smooks.model;
+
+public class Item {
+
+    public Item() {
+    }
+
+    public Item(String code, Double price, Integer quantity) {
+        this.code = code;
+        this.price = price;
+        this.quantity = quantity;
+    }
+
+    private String code;
+    private Double price;
+    private Integer quantity;
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public Double getPrice() {
+        return price;
+    }
+
+    public void setPrice(Double price) {
+        this.price = price;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        Item item = (Item) o;
+
+        if (code != null ? !code.equals(item.code) : item.code != null)
+            return false;
+        if (price != null ? !price.equals(item.price) : item.price != null)
+            return false;
+        return quantity != null ? quantity.equals(item.quantity) : item.quantity == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = code != null ? code.hashCode() : 0;
+        result = 31 * result + (price != null ? price.hashCode() : 0);
+        result = 31 * result + (quantity != null ? quantity.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Item{" + "code='" + code + '\'' + ", price=" + price + ", quantity=" + quantity + '}';
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/model/Order.java

@@ -0,0 +1,52 @@
+package com.baeldung.libraries.smooks.model;
+
+import java.util.Date;
+import java.util.List;
+
+public class Order {
+    private Date creationDate;
+    private Long number;
+    private Status status;
+    private Supplier supplier;
+    private List<Item> items;
+
+    public Date getCreationDate() {
+        return creationDate;
+    }
+
+    public void setCreationDate(Date creationDate) {
+        this.creationDate = creationDate;
+    }
+
+    public Long getNumber() {
+        return number;
+    }
+
+    public void setNumber(Long number) {
+        this.number = number;
+    }
+
+    public Status getStatus() {
+        return status;
+    }
+
+    public void setStatus(Status status) {
+        this.status = status;
+    }
+
+    public Supplier getSupplier() {
+        return supplier;
+    }
+
+    public void setSupplier(Supplier supplier) {
+        this.supplier = supplier;
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/model/Status.java

@@ -0,0 +1,5 @@
+package com.baeldung.libraries.smooks.model;
+
+public enum Status {
+    NEW, IN_PROGRESS, FINISHED
+}

libraries-data-io/src/main/java/com/baeldung/libraries/smooks/model/Supplier.java

@@ -0,0 +1,52 @@
+package com.baeldung.libraries.smooks.model;
+
+public class Supplier {
+
+    private String name;
+    private String phoneNumber;
+
+    public Supplier() {
+    }
+
+    public Supplier(String name, String phoneNumber) {
+        this.name = name;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        Supplier supplier = (Supplier) o;
+
+        if (name != null ? !name.equals(supplier.name) : supplier.name != null)
+            return false;
+        return phoneNumber != null ? phoneNumber.equals(supplier.phoneNumber) : supplier.phoneNumber == null;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = name != null ? name.hashCode() : 0;
+        result = 31 * result + (phoneNumber != null ? phoneNumber.hashCode() : 0);
+        return result;
+    }
+}

libraries-data-io/src/main/java/com/baeldung/libraries/snakeyaml/Address.java

@@ -0,0 +1,41 @@
+package com.baeldung.libraries.snakeyaml;
+
+public class Address {
+    private String line;
+    private String city;
+    private String state;
+    private Integer zip;
+
+    public String getLine() {
+        return line;
+    }
+
+    public void setLine(String line) {
+        this.line = line;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+
+    public Integer getZip() {
+        return zip;
+    }
+
+    public void setZip(Integer zip) {
+        this.zip = zip;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/snakeyaml/Contact.java

@@ -0,0 +1,26 @@
+package com.baeldung.libraries.snakeyaml;
+
+public class Contact {
+
+    private String type;
+
+    private int number;
+
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public int getNumber() {
+        return number;
+    }
+
+    public void setNumber(int number) {
+        this.number = number;
+    }
+
+}

libraries-data-io/src/main/java/com/baeldung/libraries/snakeyaml/Customer.java

@@ -0,0 +1,53 @@
+package com.baeldung.libraries.snakeyaml;
+
+import java.util.List;
+
+public class Customer {
+
+    private String firstName;
+    private String lastName;
+    private int age;
+    private List<Contact> contactDetails;
+    private Address homeAddress;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public List<Contact> getContactDetails() {
+        return contactDetails;
+    }
+
+    public void setContactDetails(List<Contact> contactDetails) {
+        this.contactDetails = contactDetails;
+    }
+
+    public Address getHomeAddress() {
+        return homeAddress;
+    }
+
+    public void setHomeAddress(Address homeAddress) {
+        this.homeAddress = homeAddress;
+    }    
+
+}

libraries-data-io/src/main/resources/csv/twoColumn.csv

@@ -0,0 +1,5 @@
+colA, ColB
+A, B
+C, D
+G, G
+G, F