From d10845eb7e57fe14089c27c0ee0ce01595593187 Mon Sep 17 00:00:00 2001
From: fujiayang <fujiayang@yingmi.cn>
Date: Fri, 8 Apr 2022 14:23:28 +0800
Subject: [PATCH] =?UTF-8?q?spring=E5=A2=9E=E5=BC=BA=E6=8A=BD=E8=B1=A1?=
 =?UTF-8?q?=E5=B7=A5=E5=8E=82=EF=BC=8C=E5=8F=8D=E5=B0=84=E4=BC=98=E5=8C=96?=
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---
 ...tory.java => AbstractStrategyFactory.java} | 30 +++++++++++++------
 .../spring/after/FormDataHandlerFactory.java  | 11 +------
 .../after/FormItemConverterFactory.java       | 11 +------
 3 files changed, 23 insertions(+), 29 deletions(-)
 rename src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/{StrategyFactory.java => AbstractStrategyFactory.java} (63%)

diff --git a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/StrategyFactory.java b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/AbstractStrategyFactory.java
similarity index 63%
rename from src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/StrategyFactory.java
rename to src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/AbstractStrategyFactory.java
index 578044d..111e109 100644
--- a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/StrategyFactory.java
+++ b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/AbstractStrategyFactory.java
@@ -6,6 +6,8 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
 import java.util.Collection;
 import java.util.Map;
 
@@ -15,7 +17,7 @@ import java.util.Map;
  * @author F嘉阳
  * @date 2022/4/8 13:42
  */
-public abstract class StrategyFactory<T, S extends Strategy<T>> implements InitializingBean, ApplicationContextAware {
+public abstract class AbstractStrategyFactory<T, S extends Strategy<T>> implements InitializingBean, ApplicationContextAware {
 
 	private Map<T, S> strategyMap;
 
@@ -31,14 +33,6 @@ public abstract class StrategyFactory<T, S extends Strategy<T>> implements Initi
 		return strategyMap.get(id);
 	}
 
-	/**
-	 * 获取策略的类型（交给子类去实现）
-	 *
-	 * @return 策略的类型
-	 */
-	protected abstract Class<S> getStrategyType();
-
-
 	@Override
 	public void afterPropertiesSet() throws Exception {
 		// 获取 Spring 容器中，所有 S 类型的 Bean
@@ -57,4 +51,22 @@ public abstract class StrategyFactory<T, S extends Strategy<T>> implements Initi
 	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
 		appContext = applicationContext;
 	}
+
+	/**
+	 * 通过反射获取策略的类型
+	 *
+	 * @return 策略的类型
+	 */
+	protected Class<S> getStrategyType() {
+		// getClass 获取当前运行时实例的类，getGenericSuperclass 获得泛型父类
+		Type superclass = getClass().getGenericSuperclass();
+		ParameterizedType pt = (ParameterizedType) superclass;
+		Type[] actualTypeArguments = pt.getActualTypeArguments();
+		// 获得索引为 1 的实际参数类型，即第二个实际参数的类型
+		Type actualTypeArgument = actualTypeArguments[1];
+		@SuppressWarnings("unchecked")
+		Class<S> result = (Class<S>) actualTypeArgument;
+
+		return result;
+	}
 }
diff --git a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormDataHandlerFactory.java b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormDataHandlerFactory.java
index 442001c..86fed4a 100644
--- a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormDataHandlerFactory.java
+++ b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormDataHandlerFactory.java
@@ -10,14 +10,5 @@ import top.fjy8018.designpattern.pattern.creational.factorymethod.spring.bean.Fo
  * @date 2022/4/8 14:14
  */
 @Component
-public class FormDataHandlerFactory extends StrategyFactory<String, FormDataHandler> {
-	/**
-	 * 获取策略的类型（交给子类去实现）
-	 *
-	 * @return 策略的类型
-	 */
-	@Override
-	protected Class<FormDataHandler> getStrategyType() {
-		return FormDataHandler.class;
-	}
+public class FormDataHandlerFactory extends AbstractStrategyFactory<String, FormDataHandler> {
 }
diff --git a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormItemConverterFactory.java b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormItemConverterFactory.java
index 007fdcb..b709deb 100644
--- a/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormItemConverterFactory.java
+++ b/src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/spring/after/FormItemConverterFactory.java
@@ -11,14 +11,5 @@ import top.fjy8018.designpattern.pattern.creational.factorymethod.spring.bean.Fo
  * @date 2022/4/8 14:17
  */
 @Component
-public class FormItemConverterFactory extends StrategyFactory<FormItemTypeEnum, FormItemConverter> {
-	/**
-	 * 获取策略的类型（交给子类去实现）
-	 *
-	 * @return 策略的类型
-	 */
-	@Override
-	protected Class<FormItemConverter> getStrategyType() {
-		return FormItemConverter.class;
-	}
+public class FormItemConverterFactory extends AbstractStrategyFactory<FormItemTypeEnum, FormItemConverter> {
 }