
package org.jxmpp.stringprep;

import java.io.IOException;

/**
 * XMPP Stringprep exceptions signal an error when performing a particular Stringprep profile on a String.
 */
public class XmppStringprepException extends IOException {

	/**
	 *
	 */
	private static final long serialVersionUID = -8491853210107124624L;

	private final String causingString;

	/**
	 * Construct a new XMPP Stringprep exception with the given causing String and exception.
	 *
	 * @param causingString the String causing the exception.
	 * @param exception the exception.
	 */
	public XmppStringprepException(String causingString, Exception exception) {
		super("XmppStringprepException caused by '" + causingString + "': " + exception);
		initCause(exception);
		this.causingString = causingString;
	}

	/**
	 * Construct a new XMPP Stringprep exception with the given causing String and exception message.
	 *
	 * @param causingString the String causing the exception.
	 * @param message the message of the exception.
	 */
	public XmppStringprepException(String causingString, String message) {
		super(message);
		this.causingString = causingString;
	}

	/**
	 * Get the String causing the XMPP Stringprep exception.
	 *
	 * @return the causing String.
	 */
	public String getCausingString() {
		return causingString;
	}

	/**
	 * The input string does not contain a domainpart.
	 */
	public static class MissingDomainpart extends XmppStringprepException {
		/**
		 * 
		 */
		private static final long serialVersionUID = 1L;

		private MissingDomainpart(String causingString) {
			super(causingString, "The provided string does not have a domainpart");
		}

		/**
		 * Create a new "missing domainpart" exception from the give parts.
		 *
		 * @param localpart the localpart.
		 * @param resourcepart the resourcepart.
		 * @return a new "missing domanipart" exception.
		 */
		public static MissingDomainpart from(String localpart, String resourcepart) {
			StringBuilder causingString = new StringBuilder();
			if (localpart != null) {
				causingString.append(localpart).append('@');
			}
			if (resourcepart != null) {
				causingString.append('/').append(resourcepart);
			}
			return new MissingDomainpart(causingString.toString());
		}
	}
}
