/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.parsers.bool;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Locale;
  
  import org.jdom2.Element;
  
  /**
   * @author Frank Lützenkirchen
   */
  public abstract class MCRSetCondition<T> implements MCRCondition<T> {
  
      public static final String AND = "and";
  
      public static final String OR = "or";
  
      protected String operator;
  
      protected List<MCRCondition<T>> children = new LinkedList<>();
  
      protected MCRSetCondition(String operator) {
          this.operator = operator;
      }
  
      public String getOperator() {
          return operator;
      }
  
      public MCRSetCondition<T> addChild(MCRCondition<T> condition) {
          children.add(condition);
          return this;
      }
  
      public MCRSetCondition<T> addAll(Collection<MCRCondition<T>> conditions) {
          children.addAll(conditions);
          return this;
      }
  
      public List<MCRCondition<T>> getChildren() {
          return children;
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          for (int i = 0; i < children.size(); i++) {
              sb.append("(").append(children.get(i)).append(")");
              if (i < children.size() - 1) {
                  sb.append(' ').append(operator.toUpperCase(Locale.ROOT)).append(' ');
              }
          }
          return sb.toString();
      }
  
      public Element toXML() {
          Element cond = new Element("boolean").setAttribute("operator", operator);
          for (MCRCondition<T> child : children) {
              cond.addContent(child.toXML());
          }
          return cond;
      }
  
      public abstract boolean evaluate(T o);
  }