/*

  *   SONEWS News Server

  *   see AUTHORS for the list of contributors

  *

  *   This program is free software: you can redistribute it and/or modify

  *   it under the terms of the GNU General Public License as published by

  *   the Free Software Foundation, either version 3 of the License, or

  *   (at your option) any later version.

  *

  *   This program is distributed in the hope that it will be useful,

  *   but WITHOUT ANY WARRANTY; without even the implied warranty of

  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  *   GNU General Public License for more details.

  *

  *   You should have received a copy of the GNU General Public License

  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

  */

 package org.sonews.storage;

 import java.io.ByteArrayInputStream;

 import java.util.Enumeration;

 import javax.mail.Header;

 import javax.mail.MessagingException;

 import javax.mail.internet.InternetHeaders;

 import javax.mail.internet.MimeUtility;

 import org.sonews.config.Config;

 /**

  * An article with no body only headers.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class ArticleHead

 {

 	protected InternetHeaders headers = null;

 	protected String headerSrc = null;

 	protected ArticleHead()

 	{

 	}

 	public ArticleHead(String headers)

 	{

 		try {

 			// Parse the header

 			this.headers = new InternetHeaders(

 				new ByteArrayInputStream(headers.getBytes()));

 		} catch (MessagingException ex) {

 			ex.printStackTrace();

 		}

 	}

 	/**

 	 * Returns the header field with given name.

 	 * @param name Name of the header field(s).

 	 * @param returnNull If set to true, this method will return null instead

 	 *                   of an empty array if there is no header field found.

 	 * @return Header values or empty string.

 	 */

 	public String[] getHeader(String name, boolean returnNull)

 	{

 		String[] ret = this.headers.getHeader(name);

 		if (ret == null && !returnNull) {

 			ret = new String[] {""};

 		}

 		return ret;

 	}

 	public String[] getHeader(String name)

 	{

 		return getHeader(name, false);

 	}

 	/**

 	 * Sets the header value identified through the header name.

 	 * @param name

 	 * @param value

 	 */

 	public void setHeader(String name, String value)

 	{

 		this.headers.setHeader(name, value);

 		this.headerSrc = null;

 	}

 	public Enumeration getAllHeaders()

 	{

 		return this.headers.getAllHeaders();

 	}

 	/**

 	 * @return Header source code of this Article.

 	 */

 	public String getHeaderSource()

 	{

 		if (this.headerSrc != null) {

 			return this.headerSrc;

 		}

 		StringBuffer buf = new StringBuffer();

 		for (Enumeration en = this.headers.getAllHeaders(); en.hasMoreElements();) {

 			Header entry = (Header) en.nextElement();

 			String value = entry.getValue().replaceAll("[\r\n]", " ");

 			buf.append(entry.getName());

 			buf.append(": ");

 			buf.append(MimeUtility.fold(entry.getName().length() + 2, value));

 			if (en.hasMoreElements()) {

 				buf.append("\r\n");

 			}

 		}

 		this.headerSrc = buf.toString();

 		return this.headerSrc;

 	}

 	/**

 	 * Sets the headers of this Article. If headers contain no

 	 * Message-Id a new one is created.

 	 * @param headers

 	 */

 	public void setHeaders(InternetHeaders headers)

 	{

 		this.headers = headers;

 		this.headerSrc = null;

 		validateHeaders();

 	}

 	/**

 	 * Checks some headers for their validity and generates an

 	 * appropriate Path-header for this host if not yet existing.

 	 * This method is called by some Article constructors and the

 	 * method setHeaders().

 	 * @return true if something on the headers was changed.

 	 */

 	protected void validateHeaders()

 	{

 		// Check for valid Path-header

 		final String path = getHeader(Headers.PATH)[0];

 		final String host = Config.inst().get(Config.HOSTNAME, "localhost");

 		if (!path.startsWith(host)) {

 			StringBuffer pathBuf = new StringBuffer();

 			pathBuf.append(host);

 			pathBuf.append('!');

 			pathBuf.append(path);

 			this.headers.setHeader(Headers.PATH, pathBuf.toString());

 		}

 	}

 }