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/smtp/RelayPath.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.smtp;

import java.util.Enumeration;
import java.util.Vector;

/**
 * A class used to represent forward and reverse relay paths.  The
 * SMTP MAIL command requires a reverse relay path while the SMTP RCPT
 * command requires a forward relay path.  See RFC 821 for more details.
 * In general, you will not have to deal with relay paths.
 *
 * @see SMTPClient
 */

public final class RelayPath
{
    private final Vector<String> path;
    private final String emailAddress;

    /**
     * Create a relay path with the specified email address as the ultimate
     * destination.
     * <p>
     * @param emailAddress The destination email address.
     */
    public RelayPath(final String emailAddress)
    {
        this.path = new Vector<>();
        this.emailAddress = emailAddress;
    }

    /**
     * Add a mail relay host to the relay path.  Hosts are added left to
     * right.  For example, the following will create the path
     * <code><b> &lt; @bar.com,@foo.com:foobar@foo.com &gt; </b></code>
     * <pre>
     * path = new RelayPath("foobar@foo.com");
     * path.addRelay("bar.com");
     * path.addRelay("foo.com");
     * </pre>
     * <p>
     * @param hostname The host to add to the relay path.
     */
    public void addRelay(final String hostname)
    {
        path.addElement(hostname);
    }

    /**
     * Return the properly formatted string representation of the relay path.
     * <p>
     * @return The properly formatted string representation of the relay path.
     */
    @Override
    public String toString()
    {
        final StringBuilder buffer = new StringBuilder();
        final Enumeration<String> hosts;

        buffer.append('<');

        hosts = path.elements();

        if (hosts.hasMoreElements())
        {
            buffer.append('@');
            buffer.append(hosts.nextElement());

            while (hosts.hasMoreElements())
            {
                buffer.append(",@");
                buffer.append(hosts.nextElement());
            }
            buffer.append(':');
        }

        buffer.append(emailAddress);
        buffer.append('>');

        return buffer.toString();
    }

}

⏎ org/apache/commons/net/smtp/RelayPath.java

Or download all of them as a single archive file:

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