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/*
* 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.nntp;
/**
* This class is used to construct the bare minimum
* acceptable header for most news readers. To construct more
* complicated headers you should refer to RFC 822. When the
* Java Mail API is finalized, you will be
* able to use it to compose fully compliant Internet text messages.
* <p>
* The main purpose of the class is to faciliatate the article posting
* process, by relieving the programmer from having to explicitly format
* an article header. For example:
* <pre>
* writer = client.postArticle();
* if(writer == null) // failure
* return false;
* header = new SimpleNNTPHeader("foobar@foo.com", "Just testing");
* header.addNewsgroup("alt.test");
* header.addHeaderField("Organization", "Foobar, Inc.");
* writer.write(header.toString());
* writer.write("This is just a test");
* writer.close();
* if(!client.completePendingCommand()) // failure
* return false;
* </pre>
*
* @see NNTPClient
*/
public class SimpleNNTPHeader
{
private final String subject, from;
private final StringBuilder newsgroups;
private final StringBuilder headerFields;
private int newsgroupCount;
/**
* Creates a new SimpleNNTPHeader instance initialized with the given
* from and subject header field values.
* <p>
* @param from The value of the <code>From:</code> header field. This
* should be the article poster's email address.
* @param subject The value of the <code>Subject:</code> header field.
* This should be the subject of the article.
*/
public SimpleNNTPHeader(final String from, final String subject)
{
this.from = from;
this.subject = subject;
this.newsgroups = new StringBuilder();
this.headerFields = new StringBuilder();
this.newsgroupCount = 0;
}
/**
* Adds an arbitrary header field with the given value to the article
* header. These headers will be written after the From, Newsgroups,
* and Subject fields when the SimpleNNTPHeader is convertered to a string.
* An example use would be:
* <pre>
* header.addHeaderField("Organization", "Foobar, Inc.");
* </pre>
* <p>
* @param headerField The header field to add, not including the colon.
* @param value The value of the added header field.
*/
public void addHeaderField(final String headerField, final String value)
{
headerFields.append(headerField);
headerFields.append(": ");
headerFields.append(value);
headerFields.append('\n');
}
/**
* Adds a newsgroup to the article <code>Newsgroups:</code> field.
* <p>
* @param newsgroup The newsgroup to add to the article's newsgroup
* distribution list.
*/
public void addNewsgroup(final String newsgroup)
{
if (newsgroupCount++ > 0) {
newsgroups.append(',');
}
newsgroups.append(newsgroup);
}
/**
* Returns the address used in the <code> From: </code> header field.
* <p>
* @return The from address.
*/
public String getFromAddress()
{
return from;
}
/**
* Returns the contents of the <code> Newsgroups: </code> header field.
* <p>
* @return The comma-separated list of newsgroups to which the article
* is being posted.
*/
public String getNewsgroups()
{
return newsgroups.toString();
}
/**
* Returns the subject used in the <code> Subject: </code> header field.
* <p>
* @return The subject.
*/
public String getSubject()
{
return subject;
}
/**
* Converts the SimpleNNTPHeader to a properly formatted header in
* the form of a String, including the blank line used to separate
* the header from the article body.
* <p>
* @return The article header in the form of a String.
*/
@Override
public String toString()
{
final StringBuilder header = new StringBuilder();
header.append("From: ");
header.append(from);
header.append("\nNewsgroups: ");
header.append(newsgroups.toString());
header.append("\nSubject: ");
header.append(subject);
header.append('\n');
if (headerFields.length() > 0) {
header.append(headerFields.toString());
}
header.append('\n');
return header.toString();
}
}