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/* * Copyright 2015 The Netty Project * * The Netty Project 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. */ package io.netty.util; import static io.netty.util.ByteProcessorUtils.CARRIAGE_RETURN; import static io.netty.util.ByteProcessorUtils.HTAB; import static io.netty.util.ByteProcessorUtils.LINE_FEED; import static io.netty.util.ByteProcessorUtils.SPACE; /** * Provides a mechanism to iterate over a collection of bytes. */ public interface ByteProcessor { /** * A {@link ByteProcessor} which finds the first appearance of a specific byte. */ class IndexOfProcessor implements ByteProcessor { private final byte byteToFind; public IndexOfProcessor(byte byteToFind) { this.byteToFind = byteToFind; } @Override public boolean process(byte value) { return value != byteToFind; } } /** * A {@link ByteProcessor} which finds the first appearance which is not of a specific byte. */ class IndexNotOfProcessor implements ByteProcessor { private final byte byteToNotFind; public IndexNotOfProcessor(byte byteToNotFind) { this.byteToNotFind = byteToNotFind; } @Override public boolean process(byte value) { return value == byteToNotFind; } } /** * Aborts on a {@code NUL (0x00)}. */ ByteProcessor FIND_NUL = new IndexOfProcessor((byte) 0); /** * Aborts on a non-{@code NUL (0x00)}. */ ByteProcessor FIND_NON_NUL = new IndexNotOfProcessor((byte) 0); /** * Aborts on a {@code CR ('\r')}. */ ByteProcessor FIND_CR = new IndexOfProcessor(CARRIAGE_RETURN); /** * Aborts on a non-{@code CR ('\r')}. */ ByteProcessor FIND_NON_CR = new IndexNotOfProcessor(CARRIAGE_RETURN); /** * Aborts on a {@code LF ('\n')}. */ ByteProcessor FIND_LF = new IndexOfProcessor(LINE_FEED); /** * Aborts on a non-{@code LF ('\n')}. */ ByteProcessor FIND_NON_LF = new IndexNotOfProcessor(LINE_FEED); /** * Aborts on a semicolon {@code (';')}. */ ByteProcessor FIND_SEMI_COLON = new IndexOfProcessor((byte) ';'); /** * Aborts on a comma {@code (',')}. */ ByteProcessor FIND_COMMA = new IndexOfProcessor((byte) ','); /** * Aborts on a ascii space character ({@code ' '}). */ ByteProcessor FIND_ASCII_SPACE = new IndexOfProcessor(SPACE); /** * Aborts on a {@code CR ('\r')} or a {@code LF ('\n')}. */ ByteProcessor FIND_CRLF = new ByteProcessor() { @Override public boolean process(byte value) { return value != CARRIAGE_RETURN && value != LINE_FEED; } }; /** * Aborts on a byte which is neither a {@code CR ('\r')} nor a {@code LF ('\n')}. */ ByteProcessor FIND_NON_CRLF = new ByteProcessor() { @Override public boolean process(byte value) { return value == CARRIAGE_RETURN || value == LINE_FEED; } }; /** * Aborts on a linear whitespace (a ({@code ' '} or a {@code '\t'}). */ ByteProcessor FIND_LINEAR_WHITESPACE = new ByteProcessor() { @Override public boolean process(byte value) { return value != SPACE && value != HTAB; } }; /** * Aborts on a byte which is not a linear whitespace (neither {@code ' '} nor {@code '\t'}). */ ByteProcessor FIND_NON_LINEAR_WHITESPACE = new ByteProcessor() { @Override public boolean process(byte value) { return value == SPACE || value == HTAB; } }; /** * @return {@code true} if the processor wants to continue the loop and handle the next byte in the buffer. * {@code false} if the processor wants to stop handling bytes and abort the loop. */ boolean process(byte value) throws Exception; }