http://hc.apache.org/httpcomponents-core-ga: Apache HttpComponents Core (blocking I/O) (The Apache Software Foundation)
  • Julius Davies
  • Andrea Selva
  • Steffen Pingel
  • Quintin Beukes
  • Marc Beyerle
  • James Abley
  • Michajlo Matijkiw 
/*
 * ====================================================================
 * 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.message;

import org.apache.http.Header;
import org.apache.http.ProtocolVersion;
import org.apache.http.RequestLine;
import org.apache.http.StatusLine;
import org.apache.http.util.CharArrayBuffer;


Interface for formatting elements of the HEAD section of an HTTP message. This is the complement to LineParser. There are individual methods for formatting a request line, a status line, or a header line. The formatting does not include the
trailing line break sequence CR-LF.
Instances of this interface are expected to be stateless and thread-safe.

 The formatted lines are returned in memory, the formatter does not depend on any specific IO mechanism. In order to avoid unnecessary creation of temporary objects, a buffer can be passed as argument to all formatting methods. The implementation may or may not actually use that buffer for formatting. If it is used, the buffer will first be cleared by the formatXXX methods. The argument buffer can always be re-used after the call. The buffer returned as the result, if it is different from the argument buffer, MUST NOT be modified. 


Since:4.0
/**
 * Interface for formatting elements of the HEAD section of an HTTP message.
 * This is the complement to {@link LineParser}.
 * There are individual methods for formatting a request line, a
 * status line, or a header line. The formatting does <i>not</i> include the
 * trailing line break sequence CR-LF.
 * Instances of this interface are expected to be stateless and thread-safe.
 *
 * <p>
 * The formatted lines are returned in memory, the formatter does not depend
 * on any specific IO mechanism.
 * In order to avoid unnecessary creation of temporary objects,
 * a buffer can be passed as argument to all formatting methods.
 * The implementation may or may not actually use that buffer for formatting.
 * If it is used, the buffer will first be cleared by the
 * {@code formatXXX} methods.
 * The argument buffer can always be re-used after the call. The buffer
 * returned as the result, if it is different from the argument buffer,
 * MUST NOT be modified.
 * </p>
 *
 * @since 4.0
 */
public interface LineFormatter {

    
Formats a protocol version.
This method does not follow the general contract for buffer arguments. It does not clear the argument buffer, but appends instead. The returned buffer can always be modified by the caller. Because of these differing conventions, it is not named formatProtocolVersion. 
Params:
  • buffer –  a buffer to which to append, or null
  • version –   the protocol version to format
Returns: a buffer with the formatted protocol version appended. The caller is allowed to modify the result buffer. If the buffer argument is not null, the returned buffer is the argument buffer.
/**
     * Formats a protocol version.
     * This method does <i>not</i> follow the general contract for
     * {@code buffer} arguments.
     * It does <i>not</i> clear the argument buffer, but appends instead.
     * The returned buffer can always be modified by the caller.
     * Because of these differing conventions, it is not named
     * {@code formatProtocolVersion}.
     *
     * @param buffer    a buffer to which to append, or {@code null}
     * @param version   the protocol version to format
     *
     * @return  a buffer with the formatted protocol version appended.
     *          The caller is allowed to modify the result buffer.
     *          If the {@code buffer} argument is not {@code null},
     *          the returned buffer is the argument buffer.
     */
    CharArrayBuffer appendProtocolVersion(CharArrayBuffer buffer,
                                          ProtocolVersion version);

    
Formats a request line.

Params:
  • buffer –  a buffer available for formatting, or null. The buffer will be cleared before use.
  • reqline –   the request line to format
Returns: the formatted request line
/**
     * Formats a request line.
     *
     * @param buffer    a buffer available for formatting, or
     *                  {@code null}.
     *                  The buffer will be cleared before use.
     * @param reqline   the request line to format
     *
     * @return  the formatted request line
     */
    CharArrayBuffer formatRequestLine(CharArrayBuffer buffer,
                                      RequestLine reqline);

    
Formats a status line.

Params:
  • buffer –  a buffer available for formatting, or null. The buffer will be cleared before use.
  • statline –  the status line to format
Throws:
Returns: the formatted status line
/**
     * Formats a status line.
     *
     * @param buffer    a buffer available for formatting, or
     *                  {@code null}.
     *                  The buffer will be cleared before use.
     * @param statline  the status line to format
     *
     * @return  the formatted status line
     *
     * @throws org.apache.http.ParseException        in case of a parse error
     */
    CharArrayBuffer formatStatusLine(CharArrayBuffer buffer,
                                     StatusLine statline);

    
Formats a header.
Due to header continuation, the result may be multiple lines.
In order to generate well-formed HTTP, the lines in the result
must be separated by the HTTP line break sequence CR-LF.
There is no trailing CR-LF in the result.


See the class comment for details about the buffer argument.



Params:
  • buffer –  a buffer available for formatting, or null. The buffer will be cleared before use.
  • header –    the header to format
Throws:
Returns: a buffer holding the formatted header, never null. The returned buffer may be different from the argument buffer.
/**
     * Formats a header.
     * Due to header continuation, the result may be multiple lines.
     * In order to generate well-formed HTTP, the lines in the result
     * must be separated by the HTTP line break sequence CR-LF.
     * There is <i>no</i> trailing CR-LF in the result.
     * <p>
     * See the class comment for details about the buffer argument.
     * </p>
     *
     * @param buffer    a buffer available for formatting, or
     *                  {@code null}.
     *                  The buffer will be cleared before use.
     * @param header    the header to format
     *
     * @return  a buffer holding the formatted header, never {@code null}.
     *          The returned buffer may be different from the argument buffer.
     *
     * @throws org.apache.http.ParseException        in case of a parse error
     */
    CharArrayBuffer formatHeader(CharArrayBuffer buffer,
                                 Header header);

}