/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/methods/OptionsMethod.java,v 1.12.2.1 2003/08/09 19:36:39 olegk Exp $
* $Revision: 1.12.2.1 $
* $Date: 2003/08/09 19:36:39 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
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* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache"
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* ====================================================================
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* [Additional notices, if required by prior licensing conditions]
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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.
* <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>
*
* @author <a href="mailto:[email protected]">Remy Maucherat</a>
* @author <a href="mailto:[email protected]">Mike Bowler</a>
* @author <a href="mailto:[email protected]">Jeff Dever</a>
*
* @version $Revision: 1.12.2.1 $
* @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
/**
* <p>
* This implementation will parse the <tt>Allow</tt> header to obtain
* the set of methods supported by the resource identified by the Request-URI.
* </p>
*
* @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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