001    /*
002     * 
003     * $Revision: 14981 $ $Date: 2009-03-20 15:19:48 +0100 (Fri, 20 Mar 2009) $
004     *
005     * This file is part of ***  M y C o R e  ***
006     * See http://www.mycore.de/ for details.
007     *
008     * This program is free software; you can use it, redistribute it
009     * and / or modify it under the terms of the GNU General Public License
010     * (GPL) as published by the Free Software Foundation; either version 2
011     * of the License or (at your option) any later version.
012     *
013     * This program is distributed in the hope that it will be useful, but
014     * WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016     * GNU General Public License for more details.
017     *
018     * You should have received a copy of the GNU General Public License
019     * along with this program, in a file called gpl.txt or license.txt.
020     * If not, write to the Free Software Foundation Inc.,
021     * 59 Temple Place - Suite 330, Boston, MA  02111-1307 USA
022     */
023    
024    package org.mycore.parsers.bool;
025    
026    import java.util.Collection;
027    import java.util.LinkedList;
028    import java.util.List;
029    
030    import org.jdom.Attribute;
031    import org.jdom.Element;
032    
033    /**
034     * @author Frank Lützenkirchen
035     */
036    public abstract class MCRSetCondition implements MCRCondition {
037    
038        public final static String AND = "and";
039    
040        public final static String OR = "or";
041    
042        protected String operator;
043    
044        protected List<MCRCondition> children = new LinkedList<MCRCondition>();
045    
046        protected MCRSetCondition(String operator) {
047            this.operator = operator;
048        }
049    
050        public String getOperator() {
051            return operator;
052        }
053    
054        public MCRSetCondition addChild(MCRCondition condition) {
055            children.add(condition);
056            return this;
057        }
058    
059        public MCRSetCondition addAll(Collection<MCRCondition> conditions) {
060            children.addAll(conditions);
061            return this;
062        }
063    
064        public List<MCRCondition> getChildren() {
065            return children;
066        }
067    
068        public String toString() {
069            StringBuffer sb = new StringBuffer();
070            for (int i = 0; i < children.size(); i++) {
071                sb.append("(").append(children.get(i)).append(")");
072                if (i < (children.size() - 1))
073                    sb.append(' ').append(operator.toUpperCase()).append(' ');
074            }
075            return sb.toString();
076        }
077    
078        public Element toXML() {
079            Element cond = new Element("boolean").setAttribute("operator", operator);
080            for (MCRCondition child : children)
081                cond.addContent(child.toXML());
082            return cond;
083        }
084    
085        public Element info() {
086            Element el = new Element("info");
087            el.setAttribute(new Attribute("type", operator));
088            el.setAttribute(new Attribute("children", "" + children.size()));
089            return el;
090        }
091    
092        public void accept(MCRConditionVisitor visitor) {
093            visitor.visitType(info());
094            for (MCRCondition child : children)
095                child.accept(visitor);
096        }
097    
098        public abstract boolean evaluate(Object o);
099    }