Add HttpMethod.values() returning an un-modifiable list of HTTP methods known by the declaring interface

src/main/java/io/vertx/core/http/HttpMethod.java

@@ -14,6 +14,7 @@ package io.vertx.core.http;
 import io.vertx.codegen.annotations.VertxGen;
 import io.vertx.core.http.impl.HttpMethodImpl;
 
+import java.util.List;
 import java.util.Objects;
 
 /**
@@ -180,6 +181,8 @@ public interface HttpMethod {
    */
   HttpMethod SEARCH = new HttpMethodImpl(io.netty.handler.codec.http.HttpMethod.valueOf("SEARCH"));
 
+
+
   /**
    * @return the method name
    */
@@ -272,4 +275,11 @@ public interface HttpMethod {
         return new HttpMethodImpl(io.netty.handler.codec.http.HttpMethod.valueOf(value));
     }
   }
+
+  /**
+   * @return an un-modifiable list of known HTTP methods
+   */
+  static List<HttpMethod> values() {
+    return HttpMethodImpl.ALL;
+  }
 }

src/main/java/io/vertx/core/http/impl/HttpMethodImpl.java

@@ -12,10 +12,47 @@ package io.vertx.core.http.impl;
 
 import io.vertx.core.http.HttpMethod;
 
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 import java.util.Objects;
 
 public class HttpMethodImpl implements HttpMethod {
 
+  public static final List<HttpMethod> ALL = Collections.unmodifiableList(Arrays.asList(
+    HttpMethod.OPTIONS,
+    HttpMethod.GET,
+    HttpMethod.HEAD,
+    HttpMethod.POST,
+    HttpMethod.PUT,
+    HttpMethod.DELETE,
+    HttpMethod.TRACE,
+    HttpMethod.CONNECT,
+    HttpMethod.PATCH,
+    HttpMethod.PROPFIND,
+    HttpMethod.PROPPATCH,
+    HttpMethod.MKCOL,
+    HttpMethod.COPY,
+    HttpMethod.MOVE,
+    HttpMethod.LOCK,
+    HttpMethod.UNLOCK,
+    HttpMethod.MKCALENDAR,
+    HttpMethod.VERSION_CONTROL,
+    HttpMethod.REPORT,
+    HttpMethod.CHECKIN,
+    HttpMethod.CHECKOUT,
+    HttpMethod.UNCHECKOUT,
+    HttpMethod.MKWORKSPACE,
+    HttpMethod.UPDATE,
+    HttpMethod.LABEL,
+    HttpMethod.MERGE,
+    HttpMethod.BASELINE_CONTROL,
+    HttpMethod.MKACTIVITY,
+    HttpMethod.ORDERPATCH,
+    HttpMethod.ACL,
+    HttpMethod.SEARCH
+  ));
+
   public static io.netty.handler.codec.http.HttpMethod toNetty(HttpMethod method) {
     if (method instanceof HttpMethodImpl) {
       return ((HttpMethodImpl) method).nettyMethod;