1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.hc.client5.http.classic.methods;
29
30 import java.net.URI;
31 import java.util.HashSet;
32 import java.util.Iterator;
33 import java.util.Set;
34
35 import org.apache.hc.core5.http.HeaderElement;
36 import org.apache.hc.core5.http.HttpResponse;
37 import org.apache.hc.core5.http.message.MessageSupport;
38 import org.apache.hc.core5.util.Args;
39
40 /**
41 * HTTP OPTIONS method.
42 *
43 * @since 4.0
44 */
45 public class HttpOptions extends HttpUriRequestBase {
46
47 private static final long serialVersionUID = 1L;
48
49 public final static String METHOD_NAME = "OPTIONS";
50
51 /**
52 * Creates a new instance initialized with the given URI.
53 *
54 * @param uri a non-null request URI.
55 * @throws IllegalArgumentException if the uri is null.
56 */
57 public HttpOptions(final URI uri) {
58 super(METHOD_NAME, uri);
59 }
60
61 /**
62 * Creates a new instance initialized with the given URI.
63 *
64 * @param uri a non-null request URI.
65 * @throws IllegalArgumentException if the uri is invalid.
66 */
67 public HttpOptions(final String uri) {
68 this(URI.create(uri));
69 }
70
71 @Override
72 public String getMethod() {
73 return METHOD_NAME;
74 }
75
76 public Set<String> getAllowedMethods(final HttpResponse response) {
77 Args.notNull(response, "HTTP response");
78
79 final Iterator<HeaderElement> it = MessageSupport.iterate(response, "Allow");
80 final Set<String> methods = new HashSet<>();
81 while (it.hasNext()) {
82 final HeaderElement element = it.next();
83 methods.add(element.getName());
84 }
85 return methods;
86 }
87
88 }