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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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
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 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.http.client.methods;

import java.net.URI;
import java.util.HashSet;
import java.util.Set;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HeaderIterator;
import org.apache.http.HttpResponse;
import org.apache.http.util.Args;

/**
 * HTTP OPTIONS method.
 * 

* The HTTP OPTIONS method is defined in section 9.2 of * RFC2616: *

*
* The OPTIONS method represents a request for information about the * communication options available on the request/response chain * identified by the Request-URI. This method allows the client to * determine the options and/or requirements associated with a resource, * or the capabilities of a server, without implying a resource action * or initiating a resource retrieval. *
* * @since 4.0 */ public class HttpOptions extends HttpRequestBase { public final static String METHOD_NAME = "OPTIONS"; public HttpOptions() { super(); } public HttpOptions(final URI uri) { super(); setURI(uri); } /** * @throws IllegalArgumentException if the uri is invalid. */ public HttpOptions(final String uri) { super(); setURI(URI.create(uri)); } @Override public String getMethod() { return METHOD_NAME; } public Set getAllowedMethods(final HttpResponse response) { Args.notNull(response, "HTTP response"); final HeaderIterator it = response.headerIterator("Allow"); final Set methods = new HashSet(); while (it.hasNext()) { final Header header = it.nextHeader(); final HeaderElement[] elements = header.getElements(); for (final HeaderElement element : elements) { methods.add(element.getName()); } } return methods; } }




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