Hw fruit shop

fruit,quantity

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+src/main/java/resources/finalReport.csv

src/main/java/core/basesyntax/Main.java

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+package core.basesyntax;
+
+import core.basesyntax.dao.FruitStorageDao;
+import core.basesyntax.dao.FruitStorageDaoImpl;
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.DataConverterService;
+import core.basesyntax.service.FileReaderService;
+import core.basesyntax.service.FileWriterService;
+import core.basesyntax.service.ReportGenerator;
+import core.basesyntax.service.ShopService;
+import core.basesyntax.service.impl.CsvFormatReportGenerator;
+import core.basesyntax.service.impl.DataConverterServiceImpl;
+import core.basesyntax.service.impl.FileReaderServiceImpl;
+import core.basesyntax.service.impl.FileWriterServiceImpl;
+import core.basesyntax.service.impl.ShopServiceImpl;
+import core.basesyntax.service.impl.operation.BalanceOperation;
+import core.basesyntax.service.impl.operation.OperationHandler;
+import core.basesyntax.service.impl.operation.PurchaseOperation;
+import core.basesyntax.service.impl.operation.ReturnOperation;
+import core.basesyntax.service.impl.operation.SupplyOperation;
+import core.basesyntax.strategy.OperationStrategy;
+import core.basesyntax.strategy.OperationStrategyImpl;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+    private static final String INPUT_FILE_PATH = "src/main/java/resources/reportToRead.csv";
+    private static final String OUTPUT_FILE_PATH = "src/main/java/resources/finalReport.csv";
+    private static final FruitStorageDao FRUIT_STORAGE_DAO = new FruitStorageDaoImpl();
+
+    private static final Map<FruitTransaction.Operation, OperationHandler> OPERATION_HANDLERS
+            = Map.of(FruitTransaction.Operation.BALANCE, new BalanceOperation(FRUIT_STORAGE_DAO),
+            FruitTransaction.Operation.PURCHASE, new PurchaseOperation(FRUIT_STORAGE_DAO),
+            FruitTransaction.Operation.RETURN, new ReturnOperation(FRUIT_STORAGE_DAO),
+            FruitTransaction.Operation.SUPPLY, new SupplyOperation(FRUIT_STORAGE_DAO));
+
+    public static void main(String[] arg) {
+        // 1. Read the data from the input CSV file
+        FileReaderService fileReader = new FileReaderServiceImpl();
+        List<String> inputReport = fileReader.read(INPUT_FILE_PATH);
+
+        // 2. Convert the incoming data into FruitTransactions list
+        DataConverterService dataConverter = new DataConverterServiceImpl();
+        List<FruitTransaction> transactions = dataConverter.convertToTransaction(inputReport);
+
+        // 3. Creating OperationStrategy with OperationHandlers
+        OperationStrategy operationStrategy = new OperationStrategyImpl(OPERATION_HANDLERS);
+
+        // 4. Process the incoming transactions with applicable OperationHandler implementations
+        ShopService shopService = new ShopServiceImpl(operationStrategy);
+        shopService.process(transactions);
+
+        // 5.Generate report based on the current Storage state
+        ReportGenerator reportGenerator = new CsvFormatReportGenerator(FRUIT_STORAGE_DAO);
+        String resultingReport = reportGenerator.create();
+
+        // 6. Write the received report into the destination file
+        FileWriterService fileWriter = new FileWriterServiceImpl();
+        fileWriter.writeToFile(OUTPUT_FILE_PATH, resultingReport);
+    }
+}

src/main/java/core/basesyntax/dao/FruitStorageDao.java

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+package core.basesyntax.dao;
+
+import java.util.Map;
+import java.util.Set;
+
+public interface FruitStorageDao {
+    void setQuantity(String fruitName, Integer quantity);
+
+    Integer getQuantity(String fruitName);
+
+    Set<Map.Entry<String, Integer>> getAll();
+}

src/main/java/core/basesyntax/dao/FruitStorageDaoImpl.java

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+package core.basesyntax.dao;
+
+import core.basesyntax.dp.Storage;
+import java.util.Map;
+import java.util.Set;
+
+public class FruitStorageDaoImpl implements FruitStorageDao {
+    @Override
+    public void setQuantity(String fruitName, Integer quantity) {
+        Storage.storage.put(fruitName, quantity);
+    }
+
+    @Override
+    public Integer getQuantity(String fruitName) {
+        if (!Storage.storage.containsKey(fruitName)) {
+            throw new RuntimeException("There is no " + fruitName + " in the storage");
+        }
+        return Storage.storage.get(fruitName);
+    }
+
+    @Override
+    public Set<Map.Entry<String, Integer>> getAll() {
+        return Map.copyOf(Storage.storage).entrySet();
+    }
+}

src/main/java/core/basesyntax/dp/Storage.java

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+package core.basesyntax.dp;
+
+import java.util.HashMap;
+
+public class Storage {
+    public static final HashMap<String, Integer> storage = new HashMap<>();
+}

src/main/java/core/basesyntax/model/FruitTransaction.java

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+package core.basesyntax.model;
+
+import java.util.Arrays;
+
+public class FruitTransaction {
+    private Operation operation;
+    private String fruit;
+    private int quantity;
+
+    public FruitTransaction(Operation operation, String fruit, int quantity) {
+        this.operation = operation;
+        this.fruit = fruit;
+        this.quantity = quantity;
+    }
+
+    public enum Operation {
+        BALANCE("b"),
+        SUPPLY("s"),
+        PURCHASE("p"),
+        RETURN("r");
+
+        private final String letter;
+
+        Operation(String operation) {
+            this.letter = operation;
+        }
+
+        public String getLetter() {
+            return letter;
+        }
+
+        public static FruitTransaction.Operation getOperation(String letter) {
+            return Arrays.stream(FruitTransaction.Operation.values())
+                    .filter(a -> a.getLetter().equals(letter))
+                    .findFirst()
+                    .orElseThrow(
+                            () -> new IllegalArgumentException(
+                                    "No enum constant for letter: " + letter
+                            )
+                    );
+        }
+    }
+
+    public Operation getOperation() {
+        return operation;
+    }
+
+    public void setOperation(Operation operation) {
+        this.operation = operation;
+    }
+
+    public String getFruit() {
+        return fruit;
+    }
+
+    public void setFruit(String fruit) {
+        this.fruit = fruit;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public String toString() {
+        return "FruitTransaction{"
+                + "operation=" + operation
+                + ", fruit='" + fruit + '\''
+                + ", quantity=" + quantity
+                + '}';
+    }
+}

src/main/java/core/basesyntax/service/DataConverterService.java

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+package core.basesyntax.service;
+
+import core.basesyntax.model.FruitTransaction;
+import java.util.List;
+
+public interface DataConverterService {
+    List<FruitTransaction> convertToTransaction(List<String> data);
+}

src/main/java/core/basesyntax/service/FileReaderService.java

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+package core.basesyntax.service;
+
+import java.util.List;
+
+public interface FileReaderService {
+    List<String> read(String pathToFile);
+}

src/main/java/core/basesyntax/service/FileWriterService.java

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+package core.basesyntax.service;
+
+public interface FileWriterService {
+    void writeToFile(String pathToFile, String report);
+}

src/main/java/core/basesyntax/service/ReportGenerator.java

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+package core.basesyntax.service;
+
+public interface ReportGenerator {
+    String create();
+}

src/main/java/core/basesyntax/service/ShopService.java

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+package core.basesyntax.service;
+
+import core.basesyntax.model.FruitTransaction;
+import java.util.List;
+
+public interface ShopService {
+    void process(List<FruitTransaction> transactions);
+}

src/main/java/core/basesyntax/service/impl/CsvFormatReportGenerator.java

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+package core.basesyntax.service.impl;
+
+import core.basesyntax.dao.FruitStorageDao;
+import core.basesyntax.service.ReportGenerator;
+import java.util.Map;
+
+public class CsvFormatReportGenerator implements ReportGenerator {
+    private static final String LINE_SEPARATOR = System.lineSeparator();
+    private static final String CSV_SEPARATOR = ",";
+    private static final String START_MESSAGE = "fruit,quantity";
+    private final FruitStorageDao storageDao;
+
+    public CsvFormatReportGenerator(FruitStorageDao storageDao) {
+        this.storageDao = storageDao;
+    }
+
+    @Override
+    public String create() {
+        StringBuilder stringBuilder = new StringBuilder();
+        stringBuilder.append(START_MESSAGE);
+
+        storageDao.getAll().stream()
+                .map(Map.Entry::getKey)
+                .forEach(e -> stringBuilder.append(LINE_SEPARATOR)
+                        .append(e)
+                        .append(CSV_SEPARATOR)
+                        .append(storageDao.getQuantity(e)));
+        return stringBuilder.toString();
+    }
+}

src/main/java/core/basesyntax/service/impl/DataConverterServiceImpl.java

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+package core.basesyntax.service.impl;
+
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.DataConverterService;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DataConverterServiceImpl implements DataConverterService {
+    public static final String SEPARATOR = ",";
+    public static final int ELEMENTS_IN_A_ROW = 3;
+
+    @Override
+    public List<FruitTransaction> convertToTransaction(List<String> data) {
+        List<FruitTransaction> transactions = new ArrayList<>();
+
+        for (int i = 1; i < data.size(); i++) {
+            String line = data.get(i);
+            String[] parts = line.split(SEPARATOR);
+
+            if (parts.length != ELEMENTS_IN_A_ROW) {
+                throw new IllegalArgumentException(
+                        "Invalid data format: "
+                                + line + ". Should be "
+                                + ELEMENTS_IN_A_ROW + " elements in a row."
+                );
+            }
+
+            try {
+                FruitTransaction.Operation operation =
+                        FruitTransaction.Operation.getOperation(parts[0].trim().toLowerCase());
+
+                String fruit = parts[1].trim();
+                int quantity = Integer.parseInt(parts[2].trim());
+
+                FruitTransaction transaction = new FruitTransaction(operation, fruit, quantity);
+                transactions.add(transaction);
+            } catch (IllegalArgumentException e) {
+                throw new RuntimeException("Error parsing line: " + line, e);
+            }
+        }
+
+        return transactions;
+    }
+}

src/main/java/core/basesyntax/service/impl/FileReaderServiceImpl.java

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+package core.basesyntax.service.impl;
+
+import core.basesyntax.service.FileReaderService;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+public class FileReaderServiceImpl implements FileReaderService {
+
+    @Override
+    public List<String> read(String pathToFile) {
+        try {
+            return Files.readAllLines(Path.of(pathToFile));
+        } catch (IOException e) {
+            throw new RuntimeException("Can't read from file: " + pathToFile, e);
+        }
+    }
+}

src/main/java/core/basesyntax/service/impl/FileWriterServiceImpl.java

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+package core.basesyntax.service.impl;
+
+import core.basesyntax.service.FileWriterService;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+
+public class FileWriterServiceImpl implements FileWriterService {
+    @Override
+    public void writeToFile(String pathToFile, String report) {
+        Path path = Path.of(pathToFile);
+        try {
+            Files.writeString(path, report, StandardOpenOption.CREATE);
+        } catch (IOException e) {
+            throw new RuntimeException("Can't write file " + path, e);
+        }
+    }
+}

src/main/java/core/basesyntax/service/impl/ShopServiceImpl.java

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+package core.basesyntax.service.impl;
+
+import core.basesyntax.model.FruitTransaction;
+import core.basesyntax.service.ShopService;
+import core.basesyntax.service.impl.operation.OperationHandler;
+import core.basesyntax.strategy.OperationStrategy;
+import java.util.List;
+
+public class ShopServiceImpl implements ShopService {
+    private final OperationStrategy operationStrategy;
+
+    public ShopServiceImpl(OperationStrategy operationStrategy) {
+        this.operationStrategy = operationStrategy;
+    }
+
+    @Override
+    public void process(List<FruitTransaction> transactions) {
+        for (FruitTransaction transaction : transactions) {
+            OperationHandler handler =
+                    operationStrategy.getOperationHandler(transaction.getOperation());
+
+            if (handler == null) {
+                throw new IllegalArgumentException(
+                        "No handler found for operation: " + transaction.getOperation()
+                );
+            }
+
+            handler.doOperation(transaction.getFruit(), transaction.getQuantity());
+        }
+    }
+}