/*
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 java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSDictionary;
import net.wotonomy.foundation.NSMutableArray;
import net.wotonomy.foundation.internal.WotonomyException;

/**
* EOAndQualifier contains other EOQualifiers,
* evaluating as true only if all of the contained
* qualifiers evaluate as true.
*
* @author michael@mpowers.net
* @author yjcheung@intersectsoft.com
* @author $Author: cgruber $
* @version $Revision: 894 $
*/
public class EOAndQualifier extends EOQualifier
	implements EOKeyValueArchiving, EOQualifierEvaluation
{
    private List qualifiers;

    public EOAndQualifier(
        List aQualifierList )
    {
        qualifiers = new LinkedList( aQualifierList );
    }

    /**
    * Returns a List of qualifiers contained by this qualifier.
    */
    public NSArray qualifiers()
    {
        return new NSArray( qualifiers );
    }

    /**
     * Add a new qualifier to the list.
     */
    public void addQualifier(EOQualifier qualifier)
    {
        qualifiers.add(qualifier);
    }

    /**
    * Evaluates this qualifier for the specified object,
    * and returns whether the object is qualified.
    * selector() is invoked on the value for key() on the
    * specified object, with value() as the parameter.
    *
    * Note: this has the lazy "and" implementation. Ex.
    * Qal1 and Qal2. If the Qal1 is evaluated to be false, then it returns
    * false without evaluating Qa12.
    */
    public boolean evaluateWithObject( Object anObject )
    {
        boolean retVal = true;
        Iterator it = qualifiers.iterator();
        while (it.hasNext() && retVal)
        {
            retVal = ((EOQualifier) it.next()).evaluateWithObject(anObject);
        }
        return retVal;
    }

    /**
    * Returns a string representation of this qualifier.
    */
    public String toString()
    {
         StringBuffer myBuf = new StringBuffer("(");
         Iterator it = qualifiers.iterator();
         while (it.hasNext())
         {
            myBuf = myBuf.append(((EOQualifier) it.next()).toString()).append(" and ");
         }
         String myStr = myBuf.toString();
         myStr = myStr.substring(0, myStr.lastIndexOf(" and")).concat(")");
         return myStr;
    }

	public static Object decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver arch) {
		NSArray a = (NSArray)arch.decodeObjectForKey("qualifiers");
		if (a == null)
			return null;
		NSMutableArray l = new NSMutableArray();
		for (int i = 0; i < a.count(); i++) {
			NSDictionary d = (NSDictionary)a.objectAtIndex(i);
			EOKeyValueUnarchiver ua = new EOKeyValueUnarchiver(d);
			EOQualifier q = (EOQualifier)EOQualifier.decodeWithKeyValueUnarchiver(ua);
			if (q != null)
				l.addObject(q);
		}
		return new EOAndQualifier(l);
	}

	public void encodeWithKeyValueArchiver(EOKeyValueArchiver arch) {
		arch.encodeObject("EOAndQualifier", "class");
		NSMutableArray arr = new NSMutableArray(qualifiers.size());
		for  (int i = 0; i < qualifiers.size(); i++) {
			EOQualifier q = (EOQualifier)qualifiers.get(i);
			if (q instanceof EOKeyValueArchiving) {
				EOKeyValueArchiver ar2 = new EOKeyValueArchiver();
				((EOKeyValueArchiving)q).encodeWithKeyValueArchiver(ar2);
				arr.addObject(ar2.dictionary());
			} else
				throw new WotonomyException("Cannot archive instance of " + q.getClass().getName());
		}
		arch.encodeObject(arr, "qualifiers");
	}

}

/*
 * $Log$
 * 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 1.6  2003/08/12 01:43:04  chochos
 * formally implement EOQualifierEvaluation
 *
 * Revision 1.5  2003/08/09 01:22:51  chochos
 * qualifiers implement EOKeyValueArchiving
 *
 * Revision 1.4  2003/08/06 23:07:52  chochos
 * general code cleanup (mostly, removing unused imports)
 *
 * Revision 1.3  2001/10/31 15:25:14  mpowers
 * Cleanup of qualifiers.
 *
 * Revision 1.2  2001/10/30 22:57:28  mpowers
 * EOQualifier framework is now working.
 *
 * Revision 1.1  2001/09/13 15:25:56  mpowers
 * Started implementation of the EOQualifier framework.
 *
 *
 */