org.apache.http.message.HeaderValueParser Maven / Gradle / Ivy
/*
* ====================================================================
* 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
*
* Some HTTP headers (such as the set-cookie header) have values that
* can be decomposed into multiple elements. In order to be processed
* by this parser, such headers must be in the following form:
*
*
* header = [ element ] *( "," [ element ] )
* element = name [ "=" [ value ] ] *( ";" [ param ] )
* param = name [ "=" [ value ] ]
*
* name = token
* value = ( token | quoted-string )
*
* token = 1*<any char except "=", ",", ";", <"> and
* white space>
* quoted-string = <"> *( text | quoted-char ) <">
* text = any char except <">
* quoted-char = "\" char
*
*
* Any amount of white space is allowed between any part of the
* header, element or param and is ignored. A missing value in any
* element or param will be stored as the empty {@link String};
* if the "=" is also missing null will be stored instead.
*
*
* Note that this parser does not apply to list-typed HTTP header fields in
* general; it is only suitable for fields that use the syntax described
* above. Counter-examples are "Link" (RFC 8288), "If-None-Match" (RFC 7232)
* or "Dav" (RFC 4918).
*
*
* @param buffer buffer holding the header value to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return an array holding all elements of the header value
*
* @throws ParseException in case of a parsing error
*/
HeaderElement[] parseElements(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Parses a single header element.
* A header element consist of a semicolon-separate list
* of name=value definitions.
*
* @param buffer buffer holding the element to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return the parsed element
*
* @throws ParseException in case of a parse error
*/
HeaderElement parseHeaderElement(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Parses a list of name-value pairs.
* These lists are used to specify parameters to a header element.
* Parse errors are indicated as {@code ParseException}.
*
* @param buffer buffer holding the name-value list to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return an array holding all items of the name-value list
*
* @throws ParseException in case of a parse error
*/
NameValuePair[] parseParameters(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Parses a name=value specification, where the = and value are optional.
*
* @param buffer the buffer holding the name-value pair to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return the name-value pair, where the value is {@code null}
* if no value is specified
*/
NameValuePair parseNameValuePair(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
}