read the yaml file

Author: g1patil

src/main/java/ood/design/ConvertJSONtoMap.java

@@ -0,0 +1,95 @@
+package ood.design;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.*;
+
+public class ConvertJSONtoMap {
+
+    private Map<String, Object> map;
+
+    @Test
+    public void parse(){
+        String test = "K1:V1\n"+
+                "K2:V2\n"+
+                "K3:\n"+
+                "  K31:V31\n"+
+                "  K32:\n"+
+                "    K321:V321\n"+
+                "     K322:V322\n"+
+                "    K333:V333\n"+
+                "K4:\n"+
+                "  K41:V41\n"+
+                "  K42:V42";
+
+        myImpl(test);
+
+    }
+
+    void jsonToMap(String input){
+        Map<String, Object> root = new HashMap<>();
+        Stack<LevelNode> stack = new Stack<>();
+        stack.push(new LevelNode(0, root));
+
+        for(String line : input.split("\n")) {
+            int level = line.lastIndexOf(" ") + 2;
+            while(stack.peek().level >= level){
+                stack.pop();
+            }
+            var parts = line.trim().split(":");
+            if(parts.length < 2){
+                // new parent
+                var newParent = new HashMap<String, Object>();
+                stack.peek().map.put(parts[0], newParent);
+                stack.push(new LevelNode(level, newParent));
+            } else{
+                stack.peek().map.put(parts[0], parts[1]);
+            }
+        }
+
+        this.map = root;
+        System.out.println(map);
+    }
+
+    private void myImpl(String input){
+        Map<String,Object> root = new HashMap<>();
+        Stack<LevelNode> stack = new Stack<>();
+        stack.push(new LevelNode(0,root));
+
+        for(String line : input.split("\n")){
+            int level = line.lastIndexOf(" ") + 2;
+
+            while(stack.peek().level >= level)
+                stack.pop();
+
+            String[] lines = line.split(":");
+
+            if(lines.length < 2){
+                var child = new HashMap<String,Object>();
+                stack.peek().map.put(lines[0].strip(),child);
+                stack.push(new LevelNode(level,child));
+            } else stack.peek().map.put(lines[0].strip(),lines[1]);
+        }
+        System.out.println(root);
+    }
+
+    public Object get(String key){
+        Object value = this.map.get(key);
+        if(value instanceof Map){
+            return value;
+        } else{
+            return null;
+        }
+    }
+
+    private static class LevelNode {
+
+        int level;
+        Map<String, Object> map;
+
+        public LevelNode(int level, Map<String, Object> map){
+            this.level = level;
+            this.map = map;
+        }
+    }
+}