1 files changed, 30 insertions, 2 deletions
diff --git a/src/main/java/edu/brown/cs/student/term/hub/LinkMapper.java b/src/main/java/edu/brown/cs/student/term/hub/LinkMapper.java
index 31e2625..e749aff 100644
--- a/src/main/java/edu/brown/cs/student/term/hub/LinkMapper.java
+++ b/src/main/java/edu/brown/cs/student/term/hub/LinkMapper.java
@@ -11,8 +11,9 @@ public class LinkMapper {
 
   //TODO: Review what we actually need in here
   //not strictly necessary but may be nice to maintain
-  private List<List<Trade>> allTrades = new ArrayList<>();
+  //private List<List<Trade>> allTrades = new ArrayList<>();
   private Map<Holder, Set<Holder>> followerToLeaders = new HashMap<>();
+  private static Map<Integer, Set<Trade>> holderIDToTrades = new HashMap<>();
   private DatabaseQuerier databaseQuerier;
 
   public LinkMapper(DatabaseQuerier db){
@@ -55,6 +56,25 @@ public class LinkMapper {
     return followerToLeaders;
   }
 
+  public static List<String> getCommonTrades(int leaderID, int followerID){
+    Set<Trade> leaderTrades = new HashSet<>(holderIDToTrades.get(leaderID));
+    Set<Trade> followerTrades = new HashSet<>(holderIDToTrades.get(followerID));
+
+    leaderTrades.retainAll(followerTrades);
+    //TODO: Could retain WAY more info in here!
+    List<String> commonTrades = new ArrayList<>();
+    for(Trade leaderTrade: leaderTrades){
+      String buyType = "";
+      if(leaderTrade.isBuy()){
+        buyType = "Buy";
+      } else{
+        buyType = "Sell";
+      }
+      commonTrades.add(buyType + ": " + leaderTrade.getStock());
+    }
+    return commonTrades;
+  }
+
   /**
    * Converts a single trade list into entries in the follower to leader map
    * @param tradeList - a list of trades for a single stock (either buy or sell)
@@ -64,7 +84,15 @@ public class LinkMapper {
 
     //gets in order list of people
     for (Trade trade : tradeList) {
-      holderList.add(trade.getHolder());
+      Holder currentHolder = trade.getHolder();
+      holderList.add(currentHolder);
+      if(!holderIDToTrades.containsKey(currentHolder.getId())){
+        Set<Trade> tradeSet = new HashSet<>();
+        tradeSet.add(trade);
+        holderIDToTrades.put(currentHolder.getId(), tradeSet);
+      } else {
+        holderIDToTrades.get(currentHolder.getId()).add(trade);
+      }
     }
 
     //Set<Holder> followers = new HashSet<>(holderList);