From 6c37bbad760e307c1a2f18cf38453873f8b17428 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=E5=98=89=E9=98=B3?= <fjy8018@qq.com>
Date: Wed, 4 Mar 2020 16:25:34 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BB=93=E5=90=88=E5=B7=A5=E5=8E=82=E6=A8=A1?=
 =?UTF-8?q?=E5=BC=8F=E6=BC=94=E8=BF=9B=E7=AD=96=E7=95=A5=E6=A8=A1=E5=BC=8F?=
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---
 .../strategy/EmptyPromotionStrategy.java      | 17 ++++++
 .../strategy/PromotionStrategyFactory.java    | 52 +++++++++++++++++++
 .../strategy/PromotionStrategyTest.java       |  7 +++
 3 files changed, 76 insertions(+)
 create mode 100644 src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/EmptyPromotionStrategy.java
 create mode 100644 src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java

diff --git a/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/EmptyPromotionStrategy.java b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/EmptyPromotionStrategy.java
new file mode 100644
index 0000000..07ff3d1
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/EmptyPromotionStrategy.java
@@ -0,0 +1,17 @@
+package top.fjy8018.designpattern.pattern.behavior.strategy;
+
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 空策略
+ *
+ * @author F嘉阳
+ * @date 2020/3/4 16:16
+ */
+@Slf4j
+public class EmptyPromotionStrategy implements PromotionStrategy {
+    @Override
+    public void doPromotion() {
+        log.info("空促销策略");
+    }
+}
diff --git a/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java
new file mode 100644
index 0000000..964ea08
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java
@@ -0,0 +1,52 @@
+package top.fjy8018.designpattern.pattern.behavior.strategy;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * 促销策略工厂
+ *
+ * @author F嘉阳
+ * @date 2020/3/4 16:09
+ */
+public class PromotionStrategyFactory {
+
+    private static Map<String, PromotionStrategy> STRATEGY_MAP = new ConcurrentHashMap<>();
+
+    /**
+     * 无促销
+     */
+    private static final PromotionStrategy NON_PROMOTION = new EmptyPromotionStrategy();
+
+    static {
+        STRATEGY_MAP.put(PromotionKey.FANXIAN, new FanXianPromotionStrategy());
+        STRATEGY_MAP.put(PromotionKey.MANJIAN, new ManJianPromotionStrategy());
+        STRATEGY_MAP.put(PromotionKey.LIJIAN, new LiJianPromotionStrategy());
+    }
+
+    /**
+     * 禁止实例化
+     */
+    private PromotionStrategyFactory() {
+    }
+
+    /**
+     * 开放获取策略的方法
+     *
+     * @param promotionKey
+     * @return
+     */
+    public static PromotionStrategy getPromotionStrategy(String promotionKey) {
+        PromotionStrategy strategy = STRATEGY_MAP.get(promotionKey);
+        return strategy == null ? NON_PROMOTION : strategy;
+    }
+
+    /**
+     * 常量定义
+     */
+    private interface PromotionKey {
+        String LIJIAN = "LIJIAN";
+        String FANXIAN = "FANXIAN";
+        String MANJIAN = "MANJIAN";
+    }
+}
diff --git a/src/test/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyTest.java b/src/test/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyTest.java
index 789942f..cf9f15f 100644
--- a/src/test/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyTest.java
+++ b/src/test/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyTest.java
@@ -24,4 +24,11 @@ class PromotionStrategyTest {
 
         activity.executePromotionStrategy();
     }
+
+    @Test
+    void nonIfElse() {
+        String promotionKey = "LIJIAN";
+        PromotionActivity activity = new PromotionActivity(PromotionStrategyFactory.getPromotionStrategy(promotionKey));
+        activity.executePromotionStrategy();
+    }
 }
\ No newline at end of file