add abstract factory

Liu Yuning · Liu Yuning · commit eed728a6649d · 2017-05-19T23:15:10.000+08:00
diff --git a/src/designpattern/factory/abstraction/Client.java b/src/designpattern/factory/abstraction/Client.java
@@ -0,0 +1,21 @@
+package designpattern.factory.abstraction;
+
+import designpattern.factory.simple.Operation;
+
+/**
+ * 客户端
+ * 
+ * @author liu yuning
+ *
+ */
+public class Client {
+    public static void main(String[] args) throws InstantiationException,
+	    IllegalAccessException {
+	Operation operation = OperationFactory.createOperation("/");
+
+	operation.numberA = 7;
+	operation.numberB = 8;
+
+	System.out.println(operation.result());
+    }
+}
diff --git a/src/designpattern/factory/abstraction/OperationFactory.java b/src/designpattern/factory/abstraction/OperationFactory.java
@@ -0,0 +1,44 @@
+package designpattern.factory.abstraction;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import designpattern.factory.simple.Operation;
+import designpattern.factory.simple.OperationAdd;
+import designpattern.factory.simple.OperationDiv;
+import designpattern.factory.simple.OperationMul;
+import designpattern.factory.simple.OperationSub;
+
+/**
+ * 利用反射改造简单工厂模式，去掉分支判断的逻辑
+ * 
+ * @author liu yuning
+ *
+ */
+public class OperationFactory {
+    private static Map<String, Class<?>> allOperationMaps = new HashMap<String, Class<?>>();
+
+    public static void fillMap() {
+	allOperationMaps.put("+", OperationAdd.class);
+	allOperationMaps.put("-", OperationSub.class);
+	allOperationMaps.put("*", OperationMul.class);
+	allOperationMaps.put("/", OperationDiv.class);
+    }
+
+    public static Operation createOperation(String operator)
+	    throws InstantiationException, IllegalAccessException {
+	Operation operation;
+
+	fillMap();
+	Class<?> operationClass = allOperationMaps.get(operator);
+
+	if (operationClass == null) {
+	    throw new RuntimeException("unsupported operation");
+	}
+
+	operation = (Operation) operationClass.newInstance();
+
+	return operation;
+    }
+
+}
