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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/StatusLine.java,v 1.9.2.4 2004/07/19 20:25:02 olegk Exp $
 * $Revision: 1.9.2.4 $
 * $Date: 2004/07/19 20:25:02 $
 *
 * ====================================================================
 *
 *  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;

/**
 * Represents a Status-Line as returned from a HTTP server.
 *
 * RFC2616 states
 * the following regarding the Status-Line:
 * 
 * 6.1 Status-Line
 *
 *  The first line of a Response message is the Status-Line, consisting
 *  of the protocol version followed by a numeric status code and its
 *  associated textual phrase, with each element separated by SP
 *  characters. No CR or LF is allowed except in the final CRLF sequence.
 *
 *      Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
 * 
*

* This class is immutable and is inherently thread safe. * * @see HttpStatus * @author Jeff Dever * @author Mike Bowler * @version $Id: StatusLine.java,v 1.9.2.4 2004/07/19 20:25:02 olegk Exp $ * @since 2.0 */ public class StatusLine { // ----------------------------------------------------- Instance Variables /** The original Status-Line. */ private final String statusLine; /** The HTTP-Version. */ private final String httpVersion; /** The Status-Code. */ private final int statusCode; /** The Reason-Phrase. */ private final String reasonPhrase; // ----------------------------------------------------------- Constructors /** * Default constructor. * * @param statusLine the status line returned from the HTTP server * @throws HttpException if the status line is invalid */ public StatusLine(final String statusLine) throws HttpException { int length = statusLine.length(); int at = 0; int start = 0; try { while (Character.isWhitespace(statusLine.charAt(at))) { ++at; ++start; } if (!"HTTP".equals(statusLine.substring(at, at += 4))) { throw new HttpException("Status-Line '" + statusLine + "' does not start with HTTP"); } //handle the HTTP-Version at = statusLine.indexOf(" ", at); if (at <= 0) { throw new HttpException( "Unable to parse HTTP-Version from the status line: '" + statusLine + "'"); } this.httpVersion = (statusLine.substring(start, at)).toUpperCase(); //advance through spaces while (statusLine.charAt(at) == ' ') { at++; } //handle the Status-Code int to = statusLine.indexOf(" ", at); if (to < 0) { to = length; } try { this.statusCode = Integer.parseInt(statusLine.substring(at, to)); } catch (NumberFormatException e) { throw new HttpException( "Unable to parse status code from status line: '" + statusLine + "'"); } //handle the Reason-Phrase at = to + 1; if (at < length) { this.reasonPhrase = statusLine.substring(at).trim(); } else { this.reasonPhrase = ""; } } catch (StringIndexOutOfBoundsException e) { throw new HttpException("Status-Line '" + statusLine + "' is not valid"); } //save the original Status-Line if everything is OK this.statusLine = new String(statusLine); } // --------------------------------------------------------- Public Methods /** * @return the Status-Code */ public final int getStatusCode() { return statusCode; } /** * @return the HTTP-Version */ public final String getHttpVersion() { return httpVersion; } /** * @return the Reason-Phrase */ public final String getReasonPhrase() { return reasonPhrase; } /** * Return the status line as it was set by the constructor. * @return a string represenation of this object. */ public final String toString() { return statusLine; } /** * Tests if the string starts with 'HTTP' signature. * @param s string to test * @return true if the line starts with 'HTTP' * signature, false otherwise. */ public static boolean startsWithHTTP(final String s) { try { int at = 0; while (Character.isWhitespace(s.charAt(at))) { ++at; } return ("HTTP".equals(s.substring(at, at + 4))); } catch (StringIndexOutOfBoundsException e) { return false; } } }



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