pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/methods/HttpOptions.java

@@ -0,0 +1,100 @@
+/*
+ * ====================================================================
+ * 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 ch.boye.httpclientandroidlib.client.methods;
+
+import java.net.URI;
+import java.util.HashSet;
+import java.util.Set;
+
+import ch.boye.httpclientandroidlib.Header;
+import ch.boye.httpclientandroidlib.HeaderElement;
+import ch.boye.httpclientandroidlib.HeaderIterator;
+import ch.boye.httpclientandroidlib.HttpResponse;
+import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * 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>
+ *
+ * @since 4.0
+ */
+@NotThreadSafe
+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) {
+        Args.notNull(response, "HTTP response");
+
+        final HeaderIterator it = response.headerIterator("Allow");
+        final Set<String> methods = new HashSet<String>();
+        while (it.hasNext()) {
+            final Header header = it.nextHeader();
+            final HeaderElement[] elements = header.getElements();
+            for (final HeaderElement element : elements) {
+                methods.add(element.getName());
+            }
+        }
+        return methods;
+    }
+
+}