Add WebUtils with HandlerMethod helpers

Introduce io.microsphere.spring.web.util.WebUtils providing two helper methods: isHandlerMethod(Object) to detect Spring HandlerMethod instances and isNoArgumentHandlerMethod(HandlerMethod) to check for no-argument handler methods. The class is utility-style with a private constructor and relies on ArrayUtils.isEmpty for parameter checks. Add corresponding unit tests (WebUtilsTest) that exercise both helpers using TestController methods and HandlerMethod instances.

Author: mercyblitz

microsphere-spring-web/src/main/java/io/microsphere/spring/web/util/WebUtils.java

@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 io.microsphere.spring.web.util;
+
+import io.microsphere.util.Utils;
+import org.springframework.web.method.HandlerMethod;
+
+import static io.microsphere.util.ArrayUtils.isEmpty;
+
+/**
+ * The utilties class for Spring Web
+ *
+ * @author <a href="mailto:mercyblitz@gmail.com">Mercy</a>
+ * @see HandlerMethod
+ * @since 1.0.0
+ */
+public abstract class WebUtils implements Utils {
+
+    /**
+     * Determine whether the specified handler is {@link HandlerMethod}
+     *
+     * @param handler the specified handler
+     * @return if the specified handler is {@link HandlerMethod}, return <code>true</code>, or <code>false</code>
+     */
+    public static boolean isHandlerMethod(Object handler) {
+        return handler instanceof HandlerMethod;
+    }
+
+    /**
+     * Determine whether the specified {@link HandlerMethod} is no argument
+     *
+     * @param handlerMethod the specified {@link HandlerMethod}
+     * @return if the specified {@link HandlerMethod} is no argument, return <code>true</code>, or <code>false</code>
+     */
+    public static boolean isNoArgumentHandlerMethod(HandlerMethod handlerMethod) {
+        return isEmpty(handlerMethod.getMethodParameters());
+    }
+
+
+    private WebUtils() {
+    }
+}

microsphere-spring-web/src/test/java/io/microsphere/spring/web/util/WebUtilsTest.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 io.microsphere.spring.web.util;
+
+
+import io.microsphere.spring.test.web.controller.TestController;
+import org.junit.jupiter.api.Test;
+import org.springframework.web.method.HandlerMethod;
+
+import java.lang.reflect.Method;
+
+import static io.microsphere.spring.web.util.WebUtils.isHandlerMethod;
+import static io.microsphere.spring.web.util.WebUtils.isNoArgumentHandlerMethod;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.springframework.beans.BeanUtils.findMethod;
+
+/**
+ * {@link WebUtils} Test
+ *
+ * @author <a href="mailto:mercyblitz@gmail.com">Mercy</a>
+ * @see WebUtils
+ * @since 1.0.0
+ */
+class WebUtilsTest {
+
+    private static final Method helloWorldMethod = findMethod(TestController.class, "helloWorld");
+
+    private static final Method greetingMethod = findMethod(TestController.class, "greeting", String.class);
+
+    @Test
+    void testIsHandlerMethod() {
+        assertFalse(isHandlerMethod(null));
+        assertFalse(isHandlerMethod(new Object()));
+        assertTrue(isHandlerMethod(new HandlerMethod(this, helloWorldMethod)));
+    }
+
+    @Test
+    void testIsNoArgumentHandlerMethod() {
+        assertTrue(isNoArgumentHandlerMethod(new HandlerMethod(this, helloWorldMethod)));
+        assertFalse(isNoArgumentHandlerMethod(new HandlerMethod(this, greetingMethod)));
+    }
+}