The little lib provides find edit and add methods for *.csv files

Author: AisekleOvus

v_0.1/source/com/ovus/aisekle/csv/Acsvl.java

@@ -45,7 +45,7 @@ private static boolean columnsAccordance(File file, Map<Long, String> lines, Str
         return lines.entrySet().stream().allMatch(entry -> entry.getValue().split(delimiter).length == fileColumnsCounter);
     }
 
-	//                                   Fine Line Method
+	//                                   Find Line Method
 
 	public static void findLine(File file, String searchString, BiConsumer<Long, String> callback) 
 			throws AcsvlException {

v_0.2/com/ovus/aisekle/example/Copper.csv

@@ -0,0 +1,71 @@
+import java.util.*;
+import java.io.*;
+
+import com.ovus.aisekle.csv.*;
+
+public class Main {
+	public static void main(String[] args) {
+        File goldFile = new File("Gold.csv");
+        File copperFile = new File("Copper.csv");
+        File copperInGoldFile = new File("CopperInGold.csv");
+        String delimiter = ",";
+/*        LinkedHashSet <String> copperInGoldLines = new LinkedHashSet<>(); 
+        
+        try(Scanner scanner = new Scanner(copperFile)) {
+        	
+            while(scanner.hasNext()) {
+                String copperFileLine = scanner.nextLine();
+    	        Integer priceCopperInGold = 0;
+      	        String[] copperFileAsArray = copperFileLine.split(delimiter);
+      	        Acsvl.findLine(goldFile, copperFileAsArray[0], 1, delimiter, (n, str) -> {
+      	       	    String[] goldFileLineAsArray = str.split(delimiter);
+      	       	    String date = goldFileLineAsArray[0];
+      	            Double copperInGoldClose = Double.parseDouble(copperFileAsArray[1])*2200/Double.parseDouble(goldFileLineAsArray[1]);
+      	            Double copperInGoldOpen = Double.parseDouble(copperFileAsArray[2])*2200/Double.parseDouble(goldFileLineAsArray[2]);
+      	            Double copperInGoldHigh = Double.parseDouble(copperFileAsArray[3])*2200/Double.parseDouble(goldFileLineAsArray[3]);
+      	            Double copperInGoldLow = Double.parseDouble(copperFileAsArray[4])*2200/Double.parseDouble(goldFileLineAsArray[4]);
+      	            copperInGoldLines.add(date+delimiter+copperInGoldClose.toString()+delimiter
+      	            		+copperInGoldOpen.toString()+delimiter
+      	            		+copperInGoldHigh.toString()+delimiter
+      	            		+copperInGoldLow.toString()+delimiter);
+      	        });
+            }
+            Acsvl.addLines(copperInGoldFile, copperInGoldLines);
+        }catch(FileNotFoundException fnfe) {
+        	System.out.println("File Not Found !");
+        }catch(AcsvlException acsvle) {
+        	acsvle.printStackTrace();
+        }*/
+    	String[] copperFileLineAsArray = new String[256];
+    	String[] goldFileLineAsArray = new String[256];
+    	long linesCounter = 0L;
+    	Long lineNumber = 0L;
+        try(Scanner scanner = new Scanner(copperFile)) {
+        	BufferedWriter bwr = new BufferedWriter(new FileWriter(copperInGoldFile));
+        	while(scanner.hasNext()) {
+        		linesCounter++;
+        		/*String[] */copperFileLineAsArray = scanner.nextLine().split(delimiter);
+        		lineNumber = Acsvl.findNextLine(goldFile, copperFileLineAsArray[0], 0, 1, delimiter).getKey();
+        		/*String[] */goldFileLineAsArray = Acsvl.findNextLine(goldFile, copperFileLineAsArray[0], 0, 1, delimiter).getValue().split(delimiter);
+        		if(lineNumber > 0) {
+  	       	        String date = goldFileLineAsArray[0];
+  	                Double copperInGoldClose = Double.parseDouble(copperFileLineAsArray[1])*2200/Double.parseDouble(goldFileLineAsArray[1]);
+  	                Double copperInGoldOpen = Double.parseDouble(copperFileLineAsArray[2])*2200/Double.parseDouble(goldFileLineAsArray[2]);
+  	                Double copperInGoldHigh = Double.parseDouble(copperFileLineAsArray[3])*2200/Double.parseDouble(goldFileLineAsArray[3]);
+  	                Double copperInGoldLow = Double.parseDouble(copperFileLineAsArray[4])*2200/Double.parseDouble(goldFileLineAsArray[4]);
+  	                bwr.write(date+delimiter+String.format(Locale.US,"%1$.3g", copperInGoldClose)+delimiter
+  	            		+String.format(Locale.US,"%1$.3g", copperInGoldOpen)+delimiter
+  	            		+String.format(Locale.US,"%1$.3g", copperInGoldHigh)+delimiter
+  	            		+String.format(Locale.US,"%1$.3g", copperInGoldLow)+delimiter+System.lineSeparator());
+        		}        		
+        	}
+        	bwr.flush();
+        	bwr.close();
+        }catch(Exception e) {
+        	System.out.println(linesCounter+" : goldFileLineAsArray.length = "+goldFileLineAsArray.length+" copperFileLineAsArray.length = "+copperFileLineAsArray.length);
+        	System.out.println("copperFileLineAsArray = \n"+Arrays.toString(copperFileLineAsArray));
+        	System.out.println("goldFileLineAsArray = \n"+Arrays.toString(goldFileLineAsArray));
+        	e.printStackTrace();
+        }
+    }
+}