refactored common logic into abstract base class for annotation-based handler creators

spring-integration-core/src/main/java/org/springframework/integration/handler/annotation/AbstractAnnotationHandlerCreator.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2002-2007 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.integration.handler.annotation;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+
+import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.core.annotation.Order;
+import org.springframework.integration.handler.AbstractMessageHandlerAdapter;
+import org.springframework.integration.handler.MessageHandler;
+
+/**
+ * Base class for handler creators for the provided object and method.
+ * 
+ * @author Mark Fisher
+ */
+public abstract class AbstractAnnotationHandlerCreator implements AnnotationHandlerCreator {
+
+	public final MessageHandler createHandler(Object object, Method method, Annotation annotation) {
+		MessageHandler handler = this.doCreateHandler(object, method, annotation);
+		if (handler instanceof AbstractMessageHandlerAdapter<?>) {
+			AbstractMessageHandlerAdapter adapter = ((AbstractMessageHandlerAdapter) handler);
+			adapter.setObject(object);
+			adapter.setMethodName(method.getName());
+			Order orderAnnotation = (Order) AnnotationUtils.getAnnotation(method, Order.class);
+			if (orderAnnotation != null) {
+				adapter.setOrder(orderAnnotation.value());
+			}
+		}
+		return handler;
+	}
+
+	protected abstract MessageHandler doCreateHandler(Object object, Method method, Annotation annotation);
+
+}