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InMemoryTransactionDAO.java
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InMemoryTransactionDAO.java
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/*
* Copyright 2015 Department of Computer Science and Engineering, University of Moratuwa.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package lk.ac.mrt.cse.dbs.simpleexpensemanager.data.impl;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.data.TransactionDAO;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.data.model.ExpenseType;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.data.model.Transaction;
/**
* This is an In-Memory implementation of TransactionDAO interface. This is not a persistent storage. All the
* transaction logs are stored in a LinkedList in memory.
*/
public class InMemoryTransactionDAO implements TransactionDAO {
private final List<Transaction> transactions;
public InMemoryTransactionDAO() {
transactions = new LinkedList<>();
}
@Override
public void logTransaction(Date date, String accountNo, ExpenseType expenseType, double amount) {
Transaction transaction = new Transaction(date, accountNo, expenseType, amount);
transactions.add(transaction);
}
@Override
public List<Transaction> getAllTransactionLogs() {
return transactions;
}
@Override
public List<Transaction> getPaginatedTransactionLogs(int limit) {
int size = transactions.size();
if (size <= limit) {
return transactions;
}
// return the last <code>limit</code> number of transaction logs
return transactions.subList(size - limit, size);
}
}