1 /* 2 * Copyright (C) 2019 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.example.atm; 18 19 import dagger.example.atm.Database.Account; 20 import java.math.BigDecimal; 21 import javax.inject.Inject; 22 23 /** Withdraws money from the ATM. */ 24 final class WithdrawCommand extends BigDecimalCommand { 25 private final Outputter outputter; 26 private final Account account; 27 private final BigDecimal minimumBalance; 28 private final WithdrawalLimiter withdrawalLimiter; 29 30 @Inject WithdrawCommand( Outputter outputter, Account account, @MinimumBalance BigDecimal minimumBalance, WithdrawalLimiter withdrawalLimiter)31 WithdrawCommand( 32 Outputter outputter, 33 Account account, 34 @MinimumBalance BigDecimal minimumBalance, 35 WithdrawalLimiter withdrawalLimiter) { 36 super(outputter); 37 this.outputter = outputter; 38 this.account = account; 39 this.minimumBalance = minimumBalance; 40 this.withdrawalLimiter = withdrawalLimiter; 41 } 42 43 @Override handleAmount(BigDecimal amount)44 protected void handleAmount(BigDecimal amount) { 45 BigDecimal remainingWithdrawalLimit = withdrawalLimiter.remainingWithdrawalLimit(); 46 if (amount.compareTo(remainingWithdrawalLimit) > 0) { 47 outputter.output( 48 String.format( 49 "you may not withdraw %s; you may withdraw %s more in this session", 50 amount, remainingWithdrawalLimit)); 51 return; 52 } 53 54 BigDecimal newBalance = account.balance().subtract(amount); 55 if (newBalance.compareTo(minimumBalance) < 0) { 56 outputter.output( 57 String.format( 58 "you don't have sufficient funds to withdraw %s. " 59 + "your balance is %s and the minimum balance is %s", 60 amount, account.balance(), minimumBalance)); 61 } else { 62 account.withdraw(amount); 63 withdrawalLimiter.recordWithdrawal(amount); 64 outputter.output("your new balance is: " + account.balance()); 65 } 66 } 67 } 68