added toCSV method and test case for it

Author: burakfirik

java/Graph.java

@@ -1,5 +1,7 @@
 package pipelinescript.java;
 
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -13,6 +15,63 @@ public Graph(int numofEdge) {
 		graph = getTable();
 		//nodes = new ArrayList<>();
 	}
+	public Graph(String[][] g) {
+		super(g);
+		graph = getTable();
+		//nodes = new ArrayList<>();
+	}
+	public int toCSV(String fileName,
+					String separator){
+	//Delimiter used in CSV file
+
+	 final String COMMADELIMITER = ",";
+	 final String NEW_LINE_SEPARATOR = "\n";
+	 final String TAB_SEPARATOR = "\t";
+	 // IF YOU LIKE TO ADD FILE HEADER AS OPTION
+	 final String FILE_HEADER = "id,firstName,lastName,gender,age";
+	 
+	 FileWriter fileWriter = null;
+
+	 try{
+		 fileWriter = new FileWriter(fileName);
+		 // Write the CSV file header
+		 //fileWriter.append(FILE_HEADER.toString());
+		 //Add a new line separator after the header
+		 // fileWriter.append(NEW_LINE_SEPARATOR);
+		 String[][] table = graph.getTableString();
+		 for (String[] line : table) {
+			 for (int j = 0 ; j < line.length ; j++) {
+				 fileWriter.append(line[j]);
+				 fileWriter.append(separator);
+			 }
+			 fileWriter.append(NEW_LINE_SEPARATOR);
+		 }
+		 System.out.println("CSV file was created successfully !!!");
+		 return 1;
+	 }catch(Exception e){
+		 return -1;
+		 /*
+		 System.out.println("Error in CsvFileWriter !!!");
+		 e.printStackTrace();
+		 */
+
+	 } finally {
+		 	try {
+		 		fileWriter.flush();
+		 		fileWriter.close();
+		 	} catch (IOException e) {
+		 		return -1;
+		 		/*
+		 		System.out.println("Error while flushing/closing fileWriter !!!");
+		 			e.printStackTrace();
+		 			*/
+		 	}
+	 }
+
+	 
+	
+	}
+	
 	public List<Node> getGraphNode(){
 		List<Node> nodes = new ArrayList<>();
 		String [][]edge = graph.getTableString();

java/GraphTest.java

@@ -1,10 +1,21 @@
 package pipelinescript.java;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 
 
 public class GraphTest {
 
 	protected Graph graph;
 
+	String [][]qtable = {{"0","1","1"},{"1","2","2"},{"0","2","4"}};
+	Graph gr = new Graph(qtable);
+	
+	@Test
+  public void testCase0() {
+		Assert.assertEquals(gr.toCSV("TestFile", "\t"), 1);
+  }
 
 }
+