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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/methods/OptionsMethod.java,v 1.12.2.2 2004/02/22 18:21:15 olegk Exp $
 * $Revision: 1.12.2.2 $
 * $Date: 2004/02/22 18:21:15 $
 *
 * ====================================================================
 *
 *  Copyright 1999-2004 The Apache Software Foundation
 *
 *  Licensed 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
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient.methods;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpConnection;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.HttpState;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;
import java.util.Enumeration;
import java.util.StringTokenizer;
import java.util.Vector;


/**
 * Implements the 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. *
*

* * @author Remy Maucherat * @author Mike Bowler * @author Jeff Dever * * @version $Revision: 1.12.2.2 $ * @since 1.0 */ public class OptionsMethod extends HttpMethodBase { // --------------------------------------------------------- Class Variables /** Log object for this class. */ private static final Log LOG = LogFactory.getLog(OptionsMethod.class); // ----------------------------------------------------------- Constructors /** * Method constructor. * * @since 1.0 */ public OptionsMethod() { } /** * Constructor specifying a URI. * * @param uri either an absolute or relative URI * * @since 1.0 */ public OptionsMethod(String uri) { super(uri); } // ----------------------------------------------------- Instance Variables /** * Methods allowed. */ private Vector methodsAllowed = new Vector(); // --------------------------------------------------------- Public Methods /** * Get the name. * @return "OPTIONS" * @since 2.0 */ public String getName() { return "OPTIONS"; } /** * Is the specified method allowed ? * * @param method The method to check. * @return true if the specified method is allowed. * @since 1.0 */ public boolean isAllowed(String method) { checkUsed(); return methodsAllowed.contains(method); } /** * Get a list of allowed methods. * @return An enumeration of all the allowed methods. * * @since 1.0 */ public Enumeration getAllowedMethods() { checkUsed(); return methodsAllowed.elements(); } // ----------------------------------------------------- HttpMethod Methods /** *

* This implementation will parse the Allow header to obtain * the set of methods supported by the resource identified by the Request-URI. *

* * @param state the {@link HttpState state} information associated with this method * @param conn the {@link HttpConnection connection} used to execute * this HTTP method * * @see #readResponse * @see #readResponseHeaders * @since 2.0 */ protected void processResponseHeaders(HttpState state, HttpConnection conn) { LOG.trace("enter OptionsMethod.processResponseHeaders(HttpState, HttpConnection)"); Header allowHeader = getResponseHeader("allow"); if (allowHeader != null) { String allowHeaderValue = allowHeader.getValue(); StringTokenizer tokenizer = new StringTokenizer(allowHeaderValue, ","); while (tokenizer.hasMoreElements()) { String methodAllowed = tokenizer.nextToken().trim().toUpperCase(); methodsAllowed.addElement(methodAllowed); } } } /** * Return true if the method needs a content-length header in the request. * * @return true if a content-length header will be expected by the server * * @since 1.0 */ public boolean needContentLength() { return false; } }


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