xmladapter4mandaraxlibpredicates.java

来自「Mandarax是一个规则引擎的纯Java实现。它支持多类型的事实和基于反映的规」· Java 代码 · 共 103 行

package org.mandarax.xkb.framework;

/**
 *  Copyright (C) 1999-2004  Jens Dietrich (mailto:[e-mail])
 *
 *  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 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.util.Map;

import org.jdom.Element;
import org.mandarax.kernel.LogicFactory;
import org.mandarax.kernel.Predicate;
import org.mandarax.xkb.XKBException;
/**
 * An adapter class for predicates from the mandarax lib.
 * @see org.mandarax.lib.AbstractPredicate
 * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
 * @version 3.4 <7 March 05>
 * @since 1.6 
 * @deprecated from v 3.4 - support for new features such as validation will not be added to XKB, please use ZKB instead
 */
public class XMLAdapter4MandaraxLibPredicates extends AbstractXMLAdapter {
      public static final String MANDARAX_LIB_PREDICATE= "mandarax_lib_predicate";
      public static final String NAME = "name";

/**
 * Export an object, i.e., convert it to an element in the DOM.
 * @param obj an object
 * @param driver the generic driver
 * @param cache a cache used in order to associate the same
 * id with various occurences of the same object
 * @exception an XKBException is thrown if export fails
 */
public Element exportObject(Object obj,GenericDriver driver,Map cache) throws  XKBException {
      check(obj,org.mandarax.lib.AbstractPredicate.class);
      Predicate p = (Predicate)obj;
      Element e = new Element(MANDARAX_LIB_PREDICATE);
      e.setAttribute(NAME,p.getClass().getName());
      return e;
}
/**
 * Build an object from an XML element.
 * @param e an element
 * @param driver the generic driver
 * @param cache a cache used to identify objects that have the same id
 * @param lfactory the logic factory used to create objects
 * @exception an XKBException is thrown if export fails
 */
public Object importObject(Element e,GenericDriver driver,Map cache,LogicFactory lfactory) throws XKBException {
       String className = e.getAttributeValue(NAME);
       // test the registries in mandarax lib for an appropriate class
       Predicate p = null;
       if (org.mandarax.lib.Cut.class.getName().equals(className)) p = new org.mandarax.lib.Cut();
       p = lookupLib(p,className,org.mandarax.lib.date.DateArithmetic.ALL_PREDICATES);
       p = lookupLib(p,className,org.mandarax.lib.math.IntArithmetic.ALL_PREDICATES);
       p = lookupLib(p,className,org.mandarax.lib.math.DoubleArithmetic.ALL_PREDICATES);
       p = lookupLib(p,className,org.mandarax.lib.text.StringArithmetic.ALL_PREDICATES);
       return p;
}
/**
 * Lookup the lib for a predicae with a certain class name.
 * Return if the predicate is not null!
 * @return a predicate
 * @param p a predicate
 * @param className the name of a class
 * @param libPredicates an array of predicates
 */
private Predicate lookupLib(Predicate p,String className,Predicate[] libPredicates) {
      if (p!=null) return p;
      for (int i=0;i<libPredicates.length;i++) {
            if (libPredicates[i].getClass().getName().equals(className)) return libPredicates[i];
      }
      return null;
}
/**
 * Get the name of the associated tag (element).
 * @return a string
 */
public String getTagName() {
      return MANDARAX_LIB_PREDICATE;
}
/**
 * Get the kind of object the adapter can export/import.
 * @return a string
 */
public String getKindOfObject() {
      return GenericDriver.MANDARAX_LIB_PREDICATE;
}
}