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   package org.neuclear.ledger.prevalent;
   
   import gnu.trove.TObjectDoubleHashMap;
   
   import java.io.Serializable;
   
   /***
    * This contains the balances of all the accounts
    */
  public final class BalanceTable implements Serializable{
      private final TObjectDoubleHashMap balances=new TObjectDoubleHashMap();
  
      double getBalance(final String id){
          if (!balances.containsKey(id))
              return 0;
          return balances.get(id);
      }
  
      double add(final String id,final double amount){
          if (!balances.containsKey(id))
              return balances.put(id,amount);
          final double nb=balances.get(id)+amount;
          return balances.put(id,nb);
      }
  }