spring增强策略模式-改造后-需求变更扩展

.idea/jarRepositories.xml

@@ -6,6 +6,11 @@
       <option name="name" value="Central Repository" />
       <option name="url" value="https://repo.maven.apache.org/maven2" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="http://maven.aliyun.com/nexus/content/groups/public/" />
+    </remote-repository>
     <remote-repository>
       <option name="id" value="central" />
       <option name="name" value="Maven Central repository" />

src/main/java/top/fjy8018/designpattern/pattern/behavior/templatemethod/spring/after/NumberPickerConverter.java

@@ -0,0 +1,61 @@
+package top.fjy8018.designpattern.pattern.behavior.templatemethod.spring.after;
+
+import org.springframework.stereotype.Component;
+import top.fjy8018.designpattern.pattern.behavior.templatemethod.spring.bean.ComponentTypeEnum;
+import top.fjy8018.designpattern.pattern.behavior.templatemethod.spring.bean.FormItemConfig;
+import top.fjy8018.designpattern.pattern.behavior.templatemethod.spring.bean.FormItemRule;
+
+import java.util.List;
+
+/**
+ * 此时要加入一种新的表单项 —— 数字选择器（NUMBER_PICKER），
+ * 它有着特殊的约束条件：最小值和最大值，输入到 FormItemConfig 时分别为 minNumer 和 maxNumber
+ * <p>
+ * 只需要添加对应的枚举和实现对应的 FormItemConverter，并不需要修改任何逻辑代码，
+ * 因为 Spring 启动时会自动帮我们处理好 NUMBER_PICKER 和 NumberPickerConverter 的关联关系 —— 完美符合 “开闭原则”
+ *
+ * @author F嘉阳
+ * @date 2022/1/26 10:13
+ */
+@Component
+public class NumberPickerConverter extends AbstractFormItemConverter {
+
+	/**
+	 * 子类可处理的表单项类型
+	 */
+	@Override
+	public ComponentTypeEnum getType() {
+		return ComponentTypeEnum.NUMBER_PICKER;
+	}
+
+	/**
+	 * 约束规则创建完成之后，子类如果需要特殊处理，可覆写该方法
+	 *
+	 * @param rules
+	 * @param config
+	 */
+	@Override
+	protected void afterRulesCreate(List<FormItemRule> rules, FormItemConfig config) {
+		Integer minNumber = config.getMinNumber();
+		// 处理最小值
+		if (minNumber != null) {
+			FormItemRule minNumRule = new FormItemRule();
+
+			minNumRule.setMinimum(minNumber);
+			minNumRule.setMessage("输入数字不能小于 " + minNumber);
+
+			rules.add(minNumRule);
+		}
+
+		Integer maxNumber = config.getMaxNumber();
+		// 处理最大值
+		if (maxNumber != null) {
+			FormItemRule maxNumRule = new FormItemRule();
+
+			maxNumRule.setMaximum(maxNumber);
+			maxNumRule.setMessage("输入数字不能大于 " + maxNumber);
+
+			rules.add(maxNumRule);
+		}
+	}
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/templatemethod/spring/bean/ComponentTypeEnum.java

@@ -15,5 +15,6 @@ public enum ComponentTypeEnum {
 	DROPDOWN_SELECT,
 	FUZZY_SEARCH,
 	TEXT_INPUT,
-	TEXT_AREA;
+	TEXT_AREA,
+	NUMBER_PICKER;
 }

src/main/java/top/fjy8018/designpattern/pattern/behavior/templatemethod/spring/bean/FormItemConfig.java

@@ -30,4 +30,8 @@ public class FormItemConfig {
 	private Integer maxLength;
 
 	private String placeholder;
+
+	private Integer minNumber;
+
+	private Integer maxNumber;
 }

src/main/java/top/fjy8018/designpattern/pattern/behavior/templatemethod/spring/bean/FormItemRule.java

@@ -18,4 +18,8 @@ public class FormItemRule {
 	private Integer min;
 
 	private Integer max;
+
+	private Integer minimum;
+
+	private Integer maximum;
 }