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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 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 org.jboss.netty.buffer;


/**
 * Locates an index of data in a {@link ChannelBuffer}.
 * 
 * This interface enables the sequential search for the data which meets more
 * complex and dynamic condition than just a simple value matching.  Please
 * refer to {@link ChannelBuffer#indexOf(int, int, ChannelBufferIndexFinder)} and
 * {@link ChannelBuffer#bytesBefore(int, int, ChannelBufferIndexFinder)}
 * for more explanation.
 *
 * @apiviz.uses org.jboss.netty.buffer.ChannelBuffer
 */
public interface ChannelBufferIndexFinder {

    /**
     * Returns {@code true} if and only if the data is found at the specified
     * {@code guessedIndex} of the specified {@code buffer}.
     * 
     * The implementation should not perform an operation which raises an
     * exception such as {@link IndexOutOfBoundsException} nor perform
     * an operation which modifies the content of the buffer.
     */
    boolean find(ChannelBuffer buffer, int guessedIndex);

    /**
     * Index finder which locates a {@code NUL (0x00)} byte.
     */
    ChannelBufferIndexFinder NUL = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) == 0;
        }
    };

    /**
     * Index finder which locates a non-{@code NUL (0x00)} byte.
     */
    ChannelBufferIndexFinder NOT_NUL = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) != 0;
        }
    };

    /**
     * Index finder which locates a {@code CR ('\r')} byte.
     */
    ChannelBufferIndexFinder CR = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) == '\r';
        }
    };

    /**
     * Index finder which locates a non-{@code CR ('\r')} byte.
     */
    ChannelBufferIndexFinder NOT_CR = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) != '\r';
        }
    };

    /**
     * Index finder which locates a {@code LF ('\n')} byte.
     */
    ChannelBufferIndexFinder LF = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) == '\n';
        }
    };

    /**
     * Index finder which locates a non-{@code LF ('\n')} byte.
     */
    ChannelBufferIndexFinder NOT_LF = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            return buffer.getByte(guessedIndex) != '\n';
        }
    };

    /**
     * Index finder which locates a {@code CR ('\r')} or {@code LF ('\n')}.
     */
    ChannelBufferIndexFinder CRLF = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            byte b = buffer.getByte(guessedIndex);
            return b == '\r' || b == '\n';
        }
    };

    /**
     * Index finder which locates a byte which is neither a {@code CR ('\r')}
     * nor a {@code LF ('\n')}.
     */
    ChannelBufferIndexFinder NOT_CRLF = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            byte b = buffer.getByte(guessedIndex);
            return b != '\r' && b != '\n';
        }
    };

    /**
     * Index finder which locates a linear whitespace
     * ({@code ' '} and {@code '\t'}).
     */
    ChannelBufferIndexFinder LINEAR_WHITESPACE = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            byte b = buffer.getByte(guessedIndex);
            return b == ' ' || b == '\t';
        }
    };

    /**
     * Index finder which locates a byte which is not a linear whitespace
     * (neither {@code ' '} nor {@code '\t'}).
     */
    ChannelBufferIndexFinder NOT_LINEAR_WHITESPACE = new ChannelBufferIndexFinder() {
        public boolean find(ChannelBuffer buffer, int guessedIndex) {
            byte b = buffer.getByte(guessedIndex);
            return b != ' ' && b != '\t';
        }
    };
}