/* * Copyright (c) 2005, John Mettraux, OpenWFE.org * All rights reserved. *  * Redistribution and use in source and binary forms, with or without  * modification, are permitted provided that the following conditions are met: *  * . Redistributions of source code must retain the above copyright notice, this *   list of conditions and the following disclaimer.   *  * . Redistributions in binary form must reproduce the above copyright notice,  *   this list of conditions and the following disclaimer in the documentation  *   and/or other materials provided with the distribution. *  * . Neither the name of the "OpenWFE" nor the names of its contributors may be *   used to endorse or promote products derived from this software without *   specific prior written permission. *  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  * POSSIBILITY OF SUCH DAMAGE. * * $Id: AndQueryItem.java,v 1.3 2005/05/17 16:40:58 jmettraux Exp $ *///// AndQueryItem.java//// john.mettraux@openwfe.org//// generated with // jtmpl 1.1.01 2004/05/19 (john.mettraux@openwfe.org)//package openwfe.org.query.item;import openwfe.org.query.QueryException;import openwfe.org.query.QueryConfiguration;import openwfe.org.query.sets.Set;import openwfe.org.query.sets.SetUtils;import openwfe.org.query.item.QueryItem;import openwfe.org.query.item.CompositeQueryItem;/** * A basic implementation of an 'and' (intersection). * * <p><font size=2>CVS Info : * <br>$Author: jmettraux $ * <br>$Id: AndQueryItem.java,v 1.3 2005/05/17 16:40:58 jmettraux Exp $ </font> * * @author john.mettraux@openwfe.org */public abstract class AndQueryItem    extends CompositeQueryItem{    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger        .getLogger(AndQueryItem.class.getName());    //    // CONSTANTS & co    //    // FIELDS    //    // CONSTRUCTORS    //    // METHODS from QueryItem    public Set query (final Object o)        throws QueryException    {        if (getChildren() == null || getChildren().size() < 1) return null;        Set result = null;        final java.util.Iterator it = getChildren().iterator();        while (it.hasNext())        {            final QueryItem qi = (QueryItem)it.next();            if (result == null)                result = qi.query(o);            else                result = SetUtils.doIntersection(result, qi.query(o));            if (result.isEmpty()) break;        }        return result;    }    public boolean validate (final Object o)        throws QueryException    {        if (getChildren() == null || getChildren().size() < 1) return false;        final java.util.Iterator it = getChildren().iterator();        while (it.hasNext())        {            final QueryItem qi = (QueryItem)it.next();            if ( ! qi.validate(o)) return false;        }        return true;    }    //    // METHODS    //    // STATIC METHODS}