commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/imap/IMAPReply.java

/*
 * 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.
 */

package org.apache.commons.net.imap;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.net.MalformedServerReplyException;

/**
 * IMAPReply stores IMAP reply code constants.
 */

public final class IMAPReply
{
    /** The reply code indicating success of an operation. */
    public static final int OK = 0;

    /** The reply code indicating failure of an operation. */
    public static final int NO = 1;

    /** The reply code indicating command rejection. */
    public static final int BAD = 2;

    /** The reply code indicating command continuation. */
    public static final int CONT = 3;

    /**
     * The reply code indicating a partial response.
     * This is used when a chunk listener is registered and the listener
     * requests that the reply lines are cleared on return.
     * @since 3.4
     */
    public static final int PARTIAL = 3;

    /** The IMAP reply String indicating success of an operation. */
    private static final String IMAP_OK = "OK";

    /** The IMAP reply String indicating failure of an operation. */
    private static final String IMAP_NO = "NO";

    /** The IMAP reply String indicating command rejection. */
    private static final String IMAP_BAD = "BAD";

    // Start of line for untagged replies
    private static final String IMAP_UNTAGGED_PREFIX = "* ";

    // Start of line for continuation replies
    private static final String IMAP_CONTINUATION_PREFIX = "+";

    // Cannot be instantiated.
    private IMAPReply()
    {}

    /**
     * Checks if the reply line is untagged - e.g. "* OK ..."
     * @param line to be checked
     * @return {@code true} if the line is untagged
     */
    public static boolean isUntagged(final String line) {
        return line.startsWith(IMAP_UNTAGGED_PREFIX);
    }

    /**
     * Checks if the reply line is a continuation, i.e. starts with "+"
     * @param line the line to be checked
     * @return {@code true} if the line is untagged
     */
    public static boolean isContinuation(final String line) {
        return line.startsWith(IMAP_CONTINUATION_PREFIX);
    }

    private static final String TAGGED_RESPONSE = "^\\w+ (\\S+).*"; // TODO perhaps be less strict on tag match?
    // tag cannot contain: + ( ) { SP CTL % * " \ ]
    private static final Pattern TAGGED_PATTERN = Pattern.compile(TAGGED_RESPONSE);

    /**
     * Intepret the String reply code - OK, NO, BAD - in a tagged response as a integer.
     *
     * @param line the tagged line to be checked
     * @return {@link #OK} or {@link #NO} or {@link #BAD} or {@link #CONT}
     * @throws IOException if the input has an unexpected format
     */
    public static int getReplyCode(final String line) throws IOException {
        return getReplyCode(line, TAGGED_PATTERN);
    }

    private static final String UNTAGGED_RESPONSE = "^\\* (\\S+).*";
    private static final Pattern UNTAGGED_PATTERN = Pattern.compile(UNTAGGED_RESPONSE);

    private static final Pattern LITERAL_PATTERN = Pattern.compile("\\{(\\d+)\\}$"); // {dd}

    /**
     * Checks if the line introduces a literal, i.e. ends with {dd}
     * @param line the line to check
     *
     * @return the literal count, or -1 if there was no literal.
     */
    public static int literalCount(final String line) {
        final Matcher m = LITERAL_PATTERN.matcher(line);
        if (m.find()) {
            return Integer.parseInt(m.group(1)); // Should always parse because we matched \d+
        }
        return -1;
    }

    /**
     * Intepret the String reply code - OK, NO, BAD - in an untagged response as a integer.
     *
     * @param line the untagged line to be checked
     * @return {@link #OK} or {@link #NO} or {@link #BAD} or {@link #CONT}
     * @throws IOException if the input has an unexpected format
     */
    public static int getUntaggedReplyCode(final String line) throws IOException {
        return getReplyCode(line, UNTAGGED_PATTERN);
    }

    // Helper method to process both tagged and untagged replies.
    private static int getReplyCode(final String line, final Pattern pattern) throws IOException{
        if (isContinuation(line)) {
            return CONT;
        }
        final Matcher m = pattern.matcher(line);
        if (m.matches()) { // TODO would lookingAt() be more efficient? If so, then drop trailing .* from patterns
            final String code = m.group(1);
            if (code.equals(IMAP_OK)) {
                return OK;
            }
            if (code.equals(IMAP_BAD)) {
                return BAD;
            }
            if (code.equals(IMAP_NO)) {
                return NO;
            }
        }
        throw new MalformedServerReplyException(
            "Received unexpected IMAP protocol response from server: '" + line + "'.");
    }

    /**
     * Checks whether the reply code indicates success or not
     *
     * @param replyCode the code to check
     * @return {@code true} if the code equals {@link #OK}
     */
    public static boolean isSuccess(final int replyCode) {
        return replyCode == OK;
    }
    /**
     * Checks if the reply line is a continuation, i.e. starts with "+"
     * @param replyCode the code to be checked
     * @return {@code true} if the response was a continuation
     */
    public static boolean isContinuation(final int replyCode) {
        return replyCode == CONT;
    }

}

/* kate: indent-width 4; replace-tabs on; */

⏎ org/apache/commons/net/imap/IMAPReply.java

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File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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