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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/client/methods/HttpOptions.java $
+ * $Revision: 664505 $
+ * $Date: 2008-06-08 06:21:20 -0700 (Sun, 08 Jun 2008) $
+ *
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * 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
+ *
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+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;
+
+/**
+ * HTTP OPTIONS method.
+ * <p>
+ * The HTTP OPTIONS method is defined in section 9.2 of
+ * <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616</a>:
+ * <blockquote>
+ * 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.
+ * </blockquote>
+ * </p>
+ *
+ * @version $Revision: 664505 $
+ *
+ * @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<String> getAllowedMethods(final HttpResponse response) {
+ if (response == null) {
+ throw new IllegalArgumentException("HTTP response may not be null");
+ }
+
+ HeaderIterator it = response.headerIterator("Allow");
+ Set<String> methods = new HashSet<String>();
+ while (it.hasNext()) {
+ Header header = it.nextHeader();
+ HeaderElement[] elements = header.getElements();
+ for (HeaderElement element : elements) {
+ methods.add(element.getName());
+ }
+ }
+ return methods;
+ }
+
+}