| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.util; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.util.Utf8Appendable.NotUtf8Exception; |
| |
| /** |
| * Stateful parser for lines of UTF8 formatted text, looking for <code>"\n"</code> as a line termination character. |
| * <p> |
| * For use with new IO framework that is based on ByteBuffer parsing. |
| */ |
| public class Utf8LineParser |
| { |
| private enum State |
| { |
| START, |
| PARSE, |
| END; |
| } |
| |
| private State state; |
| private Utf8StringBuilder utf; |
| |
| public Utf8LineParser() |
| { |
| this.state = State.START; |
| } |
| |
| /** |
| * Parse a ByteBuffer (could be a partial buffer), and return once a complete line of UTF8 parsed text has been reached. |
| * |
| * @param buf |
| * the buffer to parse (could be an incomplete buffer) |
| * @return the line of UTF8 parsed text, or null if no line end termination has been reached within the {@link ByteBuffer#remaining() remaining} bytes of |
| * the provided ByteBuffer. (In the case of a null, a subsequent ByteBuffer with a line end termination should be provided) |
| * @throws NotUtf8Exception |
| * if the input buffer has bytes that do not conform to UTF8 validation (validation performed by {@link Utf8StringBuilder} |
| */ |
| public String parse(ByteBuffer buf) |
| { |
| byte b; |
| while (buf.remaining() > 0) |
| { |
| b = buf.get(); |
| if (parseByte(b)) |
| { |
| state = State.START; |
| return utf.toString(); |
| } |
| } |
| // have not reached end of line (yet) |
| return null; |
| } |
| |
| private boolean parseByte(byte b) |
| { |
| switch (state) |
| { |
| case START: |
| utf = new Utf8StringBuilder(); |
| state = State.PARSE; |
| return parseByte(b); |
| case PARSE: |
| // not waiting on more UTF sequence parts. |
| if (utf.isUtf8SequenceComplete() && ((b == '\r') || (b == '\n'))) |
| { |
| state = State.END; |
| return parseByte(b); |
| } |
| utf.append(b); |
| break; |
| case END: |
| if (b == '\n') |
| { |
| // we've reached the end |
| state = State.START; |
| return true; |
| } |
| break; |
| } |
| return false; |
| } |
| } |