added fileManager and test case, save to csv and read from csv

Author: burakfirik

java/FileManager.java

@@ -0,0 +1,61 @@
+package pipelinescript.java;
+
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class FileManager {
+	Map<String, String> fileMap;
+	public FileManager(){
+		this.fileMap = new HashMap<>();
+	}
+	public void create(String variable, String filepath){
+		fileMap.put(variable,filepath);
+	}
+	public void delete(String variable){
+		fileMap.remove(variable);
+	}
+	public void move(String variable, String filepath){
+		fileMap.put(variable, filepath);
+	}
+	public void set(String variable, Object value){
+		
+	}
+	
+	public Object get(String variable){
+		
+		return new Object();
+	}
+	// make sure it points proper CSV file
+	public Graph getGraphFromCSV(String variable){
+		String path = fileMap.get(variable);
+		BufferedReader br = null;
+		String line = "";
+		String cvsSplitBy = "\t";
+		List<String[]> rtn = null;
+		try {
+			br = new BufferedReader(new FileReader(path));
+		} catch (FileNotFoundException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		try {
+		rtn = new ArrayList<>();
+			while ((line = br.readLine()) != null) {
+				String[] l = line.split(cvsSplitBy);
+				rtn.add(l);
+			}
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+
+		return new Graph(rtn);
+	}
+
+}

java/FileManagerTest.java

@@ -0,0 +1,20 @@
+package pipelinescript.java;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class FileManagerTest {
+	protected FileManager filemanager = new FileManager();
+	
+	//filemanager = new FileManager();
+	String [][]qtable = {{"0","1","1"},{"1","2","2"},{"0","2","4"}};
+	Graph gr = new Graph(qtable);
+	
+	@Test
+  public void testCase0() {
+		filemanager.create("test0", "./TestFile.csv");
+		Graph g2 = filemanager.getGraphFromCSV("test0");
+		Assert.assertEquals(g2 , gr);
+  }
+	
+}