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hm done #681

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6 changes: 3 additions & 3 deletions src/main/java/mate.academy/Main.java
Original file line number Diff line number Diff line change
Expand Up @@ -8,10 +8,10 @@
public class Main {

public static void main(String[] args) {
// Please test your Injector here. Feel free to push this class as a part of your solution
Injector injector = Injector.getInjector();
ProductService productService = null;
List<Product> products = productService.getAllFromFile("products.txt");
ProductService productService = (ProductService) injector.getInstance(ProductService.class);
List<Product> products;
products = productService.getAllFromFile("products.txt");
products.forEach(System.out::println);
}
}
7 changes: 7 additions & 0 deletions src/main/java/mate.academy/lib/Component.java
Original file line number Diff line number Diff line change
@@ -1,5 +1,12 @@
package mate.academy.lib;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface Component {

}
7 changes: 7 additions & 0 deletions src/main/java/mate.academy/lib/Inject.java
Original file line number Diff line number Diff line change
@@ -1,5 +1,12 @@
package mate.academy.lib;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Inject {

}
70 changes: 69 additions & 1 deletion src/main/java/mate.academy/lib/Injector.java
Original file line number Diff line number Diff line change
@@ -1,13 +1,81 @@
package mate.academy.lib;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import mate.academy.service.FileReaderService;
import mate.academy.service.ProductParser;
import mate.academy.service.ProductService;
import mate.academy.service.impl.FileReaderServiceImpl;
import mate.academy.service.impl.ProductParserImpl;
import mate.academy.service.impl.ProductServiceImpl;

public class Injector {
private static final Injector injector = new Injector();
private final Map<Class<?>, Class<?>> implementationMap;
private final Map<Class<?>, Object> instances;

private Injector() {
implementationMap = new HashMap<>();
implementationMap.put(FileReaderService.class, FileReaderServiceImpl.class);
implementationMap.put(ProductParser.class, ProductParserImpl.class);
implementationMap.put(ProductService.class, ProductServiceImpl.class);

instances = new HashMap<>();
}

public static Injector getInjector() {
return injector;
}

public Object getInstance(Class<?> interfaceClazz) {
return null;
if (!interfaceClazz.isInterface()) {
throw new RuntimeException("Unsupported class: " + interfaceClazz.getName());
}

if (instances.containsKey(interfaceClazz)) {
return instances.get(interfaceClazz);
}

Class<?> clazz = implementationMap.get(interfaceClazz);
if (clazz == null) {
throw new RuntimeException("No implementation found for interface: "
+ interfaceClazz.getName());
}

Object clazzImplementationInstance = createNewInstance(clazz);
initializeFields(clazz, clazzImplementationInstance);

instances.put(interfaceClazz, clazzImplementationInstance);

return clazzImplementationInstance;
}

private Object createNewInstance(Class<?> clazz) {
try {
Constructor<?> constructor = clazz.getDeclaredConstructor();
constructor.setAccessible(true);
return constructor.newInstance();
} catch (ReflectiveOperationException e) {
throw new RuntimeException("Unable to create a new class instance "
+ clazz.getName());
}
}

private void initializeFields(Class<?> clazz, Object instance) {
Field[] declaredFields = clazz.getDeclaredFields();
for (Field field : declaredFields) {
if (field.isAnnotationPresent(Inject.class)) {
field.setAccessible(true);
Object fieldInstance = getInstance(field.getType());
try {
field.set(instance, fieldInstance);
} catch (IllegalAccessException e) {
throw new RuntimeException("Cannot initialize field value. "
+ "Class: " + clazz.getName() + ", Field: " + field.getName());
}
}
}
}
}
Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,10 @@
import java.io.IOException;
import java.nio.file.Files;
import java.util.List;
import mate.academy.lib.Component;
import mate.academy.service.FileReaderService;

@Component
public class FileReaderServiceImpl implements FileReaderService {
@Override
public List<String> readFile(String fileName) {
Expand Down
Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
package mate.academy.service.impl;

import java.math.BigDecimal;
import mate.academy.lib.Component;
import mate.academy.model.Product;
import mate.academy.service.ProductParser;

@Component
public class ProductParserImpl implements ProductParser {
public static final int ID_POSITION = 0;
public static final int NAME_POSITION = 1;
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,18 @@

import java.util.List;
import java.util.stream.Collectors;
import mate.academy.lib.Component;
import mate.academy.lib.Inject;
import mate.academy.model.Product;
import mate.academy.service.FileReaderService;
import mate.academy.service.ProductParser;
import mate.academy.service.ProductService;

@Component
public class ProductServiceImpl implements ProductService {
@Inject
private ProductParser productParser;
@Inject
private FileReaderService fileReaderService;

@Override
Expand Down
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