import java.util.ArrayList;
import java.util.HashMap;

public class TransactionPool {

   private HashMap<ByteArrayWrapper, Transaction> H;

   public TransactionPool() {
      H = new HashMap<ByteArrayWrapper, Transaction>();
   }

   public TransactionPool(TransactionPool txPool) {
      H = new HashMap<ByteArrayWrapper, Transaction>(txPool.H);
   }

   public void addTransaction(Transaction tx) {
      ByteArrayWrapper hash = new ByteArrayWrapper(tx.getHash());
      H.put(hash, tx);
   }

   public void removeTransaction(byte[] txHash) {
      ByteArrayWrapper hash = new ByteArrayWrapper(txHash);
      H.remove(hash);
   }

   public Transaction getTransaction(byte[] txHash) {
      ByteArrayWrapper hash = new ByteArrayWrapper(txHash);
      return H.get(hash);
   }

   public ArrayList<Transaction> getTransactions() {
      ArrayList<Transaction> T = new ArrayList<Transaction>();
      for (Transaction tx : H.values())
         T.add(tx);
      return T;
   }
}