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 }