/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Intersect Software Corporation

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/

package net.wotonomy.control;

import net.wotonomy.foundation.internal.WotonomyException;

/**
* EONotQualifiier negates a specified qualifier,
* evaluating to the opposite of the specified qualifier.
*
* @author michael@mpowers.net
* @author yjcheung@intersectsoft.com
* @author $Author: cgruber $
* @version $Revision: 894 $
*/
public class EONotQualifier extends EOQualifier
	implements EOKeyValueArchiving, EOQualifierEvaluation
{
    private EOQualifier qualifier;

    public EONotQualifier(
        EOQualifier aQualifier )
    {
        qualifier = aQualifier;
    }

    /**
    * Returns the qualifier that this qualifier negates.
    */
    public EOQualifier qualifier()
    {
        return qualifier;
    }

    /**
    * Evaluates this qualifier for the specified object,
    * and returns whether the object is qualified.
    * evaluateWithObject is invoked on qualifier
    * and the result is negated and returned.
    */
    public boolean evaluateWithObject( Object anObject )
    {
        return !(qualifier.evaluateWithObject(anObject));
    }

    /**
    * Returns a string representation of this qualifier.
    */
    public String toString()
    {
         return (new StringBuffer("Not ").append(qualifier.toString()).toString());
    }

	public static Object decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver arch) {
		EOQualifier q = (EOQualifier)arch.decodeObjectForKey("qualifier");
		if (q == null)
			return null;
		return new EONotQualifier(q);
	}

	public void encodeWithKeyValueArchiver(EOKeyValueArchiver arch) {
		arch.encodeObject("EONotQualifier", "class");
		if (qualifier instanceof EOKeyValueArchiving) {
			EOKeyValueArchiver ar2 = new EOKeyValueArchiver();
			((EOKeyValueArchiving)qualifier).encodeWithKeyValueArchiver(ar2);
			arch.encodeObject(ar2.dictionary(), "qualifiers");
		} else
			throw new WotonomyException("Cannot archive instance of " + qualifier.getClass().getName());
	}

}

/*
 * $Log$
 * Revision 1.2  2006/02/16 16:47:14  cgruber
 * Move some classes in to "internal" packages and re-work imports, etc.
 *
 * Also use UnsupportedOperationExceptions where appropriate, instead of WotonomyExceptions.
 *
 * Revision 1.1  2006/02/16 13:19:57  cgruber
 * Check in all sources in eclipse-friendly maven-enabled packages.
 *
 * Revision 1.9  2003/08/12 01:43:04  chochos
 * formally implement EOQualifierEvaluation
 *
 * Revision 1.8  2003/08/11 19:39:30  chochos
 * special conditions for NSKeyValueCoding.NullValue -> EONull
 *
 * Revision 1.7  2003/08/09 01:24:19  chochos
 * implements EOKeyValueArchiving
 *
 * Revision 1.6  2003/08/06 23:07:52  chochos
 * general code cleanup (mostly, removing unused imports)
 *
 * Revision 1.5  2001/10/31 15:25:14  mpowers
 * Cleanup of qualifiers.
 *
 * Revision 1.4  2001/10/30 22:57:28  mpowers
 * EOQualifier framework is now working.
 *
 * Revision 1.3  2001/09/13 15:42:20  mpowers
 * Fixed another cut/paste typo.
 *
 * Revision 1.2  2001/09/13 15:41:34  mpowers
 * Fixed typo.
 *
 * Revision 1.1  2001/09/13 15:38:19  mpowers
 * Started implementation of the EOQualifier framework.
 *
 *
 */