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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib.message;
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.ParseException;
import ch.boye.httpclientandroidlib.ProtocolVersion;
import ch.boye.httpclientandroidlib.RequestLine;
import ch.boye.httpclientandroidlib.StatusLine;
import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
/**
* Interface for parsing lines in the HEAD section of an HTTP message.
* There are individual methods for parsing a request line, a
* status line, or a header line.
* The lines to parse are passed in memory, the parser does not depend
* on any specific IO mechanism.
* Instances of this interface are expected to be stateless and thread-safe.
*
* @since 4.0
*/
public interface LineParser {
/**
* Parses the textual representation of a protocol version.
* This is needed for parsing request lines (last element)
* as well as status lines (first element).
*
* @param buffer a buffer holding the protocol version to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return the parsed protocol version
*
* @throws ParseException in case of a parse error
*/
ProtocolVersion parseProtocolVersion(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Checks whether there likely is a protocol version in a line.
* This method implements a <i>heuristic</i> to check for a
* likely protocol version specification. It does <i>not</i>
* guarantee that {@link #parseProtocolVersion} would not
* detect a parse error.
* This can be used to detect garbage lines before a request
* or status line.
*
* @param buffer a buffer holding the line to inspect
* @param cursor the cursor at which to check for a protocol version, or
* negative for "end of line". Whether the check tolerates
* whitespace before or after the protocol version is
* implementation dependent.
*
* @return <code>true</code> if there is a protocol version at the
* argument index (possibly ignoring whitespace),
* <code>false</code> otherwise
*/
boolean hasProtocolVersion(
CharArrayBuffer buffer,
ParserCursor cursor);
/**
* Parses a request line.
*
* @param buffer a buffer holding the line to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return the parsed request line
*
* @throws ParseException in case of a parse error
*/
RequestLine parseRequestLine(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Parses a status line.
*
* @param buffer a buffer holding the line to parse
* @param cursor the parser cursor containing the current position and
* the bounds within the buffer for the parsing operation
*
* @return the parsed status line
*
* @throws ParseException in case of a parse error
*/
StatusLine parseStatusLine(
CharArrayBuffer buffer,
ParserCursor cursor) throws ParseException;
/**
* Creates a header from a line.
* The full header line is expected here. Header continuation lines
* must be joined by the caller before invoking this method.
*
* @param buffer a buffer holding the full header line.
* This buffer MUST NOT be re-used afterwards, since
* the returned object may reference the contents later.
*
* @return the header in the argument buffer.
* The returned object MAY be a wrapper for the argument buffer.
* The argument buffer MUST NOT be re-used or changed afterwards.
*
* @throws ParseException in case of a parse error
*/
Header parseHeader(CharArrayBuffer buffer)
throws ParseException;
}
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