Add naming strategy for @MVC request mappings.

This change adds a strategy for assigning a default name to an
@RequestMapping controller method. The @RequestMapping annotation
itself now has a name attribute allowing the explicit assignment
of a mapping name.

This is mainly intended for use in EL expressions in views. The
RequestContext class now provides a getMvcUrl method that internally
delegates to MvcUriComponents to look up the handler method.

See the Javadoc of MvcUriComponents.fromMappingName.

Issue: SPR-5779

spring-web/src/test/java/org/springframework/web/method/support/CompositeUriComponentsContributorTests.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2002-2014 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.web.method.support;
+
+import org.junit.Test;
+import org.springframework.core.MethodParameter;
+import org.springframework.util.ClassUtils;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.method.annotation.RequestHeaderMethodArgumentResolver;
+import org.springframework.web.method.annotation.RequestParamMethodArgumentResolver;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Unit tests for
+ * {@link org.springframework.web.method.support.CompositeUriComponentsContributor}.
+ *
+ * @author Rossen Stoyanchev
+ */
+public class CompositeUriComponentsContributorTests {
+
+
+	@Test
+	public void supportsParameter() {
+
+		List<HandlerMethodArgumentResolver> resolvers = new ArrayList<HandlerMethodArgumentResolver>();
+		resolvers.add(new RequestParamMethodArgumentResolver(false));
+		resolvers.add(new RequestHeaderMethodArgumentResolver(null));
+		resolvers.add(new RequestParamMethodArgumentResolver(true));
+
+		Method method = ClassUtils.getMethod(this.getClass(), "handleRequest", String.class, String.class, String.class);
+
+		CompositeUriComponentsContributor contributor = new CompositeUriComponentsContributor(resolvers);
+		assertTrue(contributor.supportsParameter(new MethodParameter(method, 0)));
+		assertTrue(contributor.supportsParameter(new MethodParameter(method, 1)));
+		assertFalse(contributor.supportsParameter(new MethodParameter(method, 2)));
+	}
+
+
+	@SuppressWarnings("unused")
+	public void handleRequest(@RequestParam String p1, String p2, @RequestHeader String h) {
+	}
+
+}