Added File Reader

buisnesslogic/pom.xml

@@ -45,10 +45,26 @@
       <artifactId>spring-boot-starter-data-jpa</artifactId>
     </dependency>
 
+    <!-- dependency used for XLSX file format -->
+    <dependency>
+      <groupId>org.apache.poi</groupId>
+      <artifactId>poi-ooxml</artifactId>
+      <version>3.17</version>
+    </dependency>
+
+    <!-- dependency used for XLS older file format
+      (added for information) -->
+    <dependency>
+      <groupId>org.apache.poi</groupId>
+      <artifactId>poi</artifactId>
+      <version>3.17</version>
+    </dependency>
+
   </dependencies>
 
   <build>
-    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+    <pluginManagement>
+      <!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
       <plugins>
         <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
         <plugin>

buisnesslogic/src/main/java/com/plannaplan/configutils/FileReader.java

@@ -0,0 +1,55 @@
+package com.plannaplan.configutils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Hashtable;
+import java.util.Iterator;
+
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.Row;
+import com.plannaplan.models.FileData;
+
+public class FileReader {
+
+    private InputStream fileInputStream;
+
+    public FileReader(InputStream fileInputStream) {
+        this.fileInputStream = fileInputStream;
+    }
+
+    public FileData read() {
+
+        FileData result = null;
+
+        try {
+            InputStream fis = this.fileInputStream;
+            XSSFWorkbook workbook = new XSSFWorkbook(fis);
+            XSSFSheet sheet = workbook.getSheetAt(0);
+
+            Iterator<Row> rowIt = sheet.iterator();
+
+            Row row = rowIt.next();
+            Iterator<Cell> cellIt = row.cellIterator();
+
+            Hashtable<String, Integer> keys = new Hashtable<>();
+            int index = 0;
+            while (cellIt.hasNext()) {
+                Cell c = cellIt.next();
+                keys.put(c.toString(), index);
+            }
+
+            rowIt.remove();
+            result = new FileData(keys, rowIt);
+            workbook.close();
+            fis.close();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return result;
+    }
+
+}

buisnesslogic/src/main/java/com/plannaplan/configutils/FileToDatabaseMigrator.java

@@ -1,12 +1,12 @@
 package com.plannaplan.configutils;
 
-import java.io.File;
+import com.plannaplan.models.FileData;
 
 public class FileToDatabaseMigrator {
     public FileToDatabaseMigrator() {
     }
 
-    public void migrate(File file) {
+    public void migrate(FileData data) {
 
     }
 }

buisnesslogic/src/main/java/com/plannaplan/models/FileData.java

@@ -0,0 +1,34 @@
+package com.plannaplan.models;
+
+import java.util.Dictionary;
+import java.util.Iterator;
+
+import org.apache.poi.ss.usermodel.Row;
+
+public class FileData {
+
+    private Dictionary<String, Integer> keys;
+    private Iterator<Row> rows;
+
+    public FileData(Dictionary<String, Integer> keys, Iterator<Row> rows) {
+        this.setKeys(keys);
+        this.setRows(rows);
+    }
+
+    public Iterator<Row> getRows() {
+        return rows;
+    }
+
+    public void setRows(Iterator<Row> rows) {
+        this.rows = rows;
+    }
+
+    public Dictionary<String, Integer> getKeys() {
+        return keys;
+    }
+
+    public void setKeys(Dictionary<String, Integer> keys) {
+        this.keys = keys;
+    }
+
+}

buisnesslogic/src/test/java/com/plannaplan/configutils/FileReaderTest.java

@@ -0,0 +1,21 @@
+package com.plannaplan.configutils;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.InputStream;
+
+import com.plannaplan.models.FileData;
+
+import org.junit.Test;
+
+public class FileReaderTest {
+    @Test
+    public void shoulReturnNull() {
+        InputStream inputStream = getClass().getClassLoader().getResourceAsStream("Zajecia.xlsx");
+        FileReader r = new FileReader(inputStream);
+        FileData d = r.read();
+        assertTrue(d.getRows().next().getCell(0).toString().equals("1.0"));
+        assertTrue(d.getKeys().size() == 22);
+        assertTrue(d != null);
+    }
+}