org.sakaiproject.conditions.impl.BaseRule.java Source code

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Here is the source code for org.sakaiproject.conditions.impl.BaseRule.java

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/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/kernel/trunk/api/src/main/java/org/sakaiproject/antivirus/api/VirusFoundException.java $
 * $Id: VirusFoundException.java 68335 2009-10-29 08:18:43Z david.horwitz@uct.ac.za $
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/
package org.sakaiproject.conditions.impl;

import java.util.List;

import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.PredicateUtils;
import org.sakaiproject.conditions.api.EvaluationAction;
import org.sakaiproject.conditions.api.Rule;
import org.sakaiproject.conditions.api.Condition;
import org.sakaiproject.event.api.Event;
import org.sakaiproject.event.api.Notification;
import org.sakaiproject.event.api.NotificationAction;
import org.w3c.dom.Element;

public class BaseRule implements Rule, NotificationAction {

    private String resourceId;
    private List<Condition> predicates;
    private Conjunction conj;
    private EvaluationAction command;

    public BaseRule(String resourceId, List<Condition> predicates, EvaluationAction command, Conjunction conj) {
        this.resourceId = resourceId;
        this.predicates = predicates;
        this.command = command;
        this.conj = conj;
    }

    public boolean evaluate(Object arg0) {
        Predicate judgement = new NullPredicate();
        if (predicates.size() == 1) {
            judgement = predicates.get(0);
        } else {
            if (conj == Conjunction.AND) {
                judgement = PredicateUtils.allPredicate(predicates);
            } else if (conj == Conjunction.OR) {
                judgement = PredicateUtils.anyPredicate(predicates);
            }
        }

        return judgement.evaluate(arg0);
    }

    public NotificationAction getClone() {
        // TODO Auto-generated method stub
        return null;
    }

    public void notify(Notification notification, Event event) {
        try {
            command.execute(event, this.evaluate(event));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void set(Element el) {
        // TODO Auto-generated method stub

    }

    public void set(NotificationAction other) {
        // TODO Auto-generated method stub

    }

    public void toXml(Element el) {
        el.setAttribute("resourceId", this.resourceId);

        if (this.conj == Rule.Conjunction.OR) {
            el.setAttribute("conjunction", "OR");
        } else if (this.conj == Rule.Conjunction.AND) {
            el.setAttribute("conjunction", "AND");
        }

        Element predicates = el.getOwnerDocument().createElement("predicates");
        el.appendChild(predicates);
        for (Condition c : this.predicates) {
            Element predicateElement = el.getOwnerDocument().createElement("predicate");
            predicateElement.setAttribute("class", c.getClass().getName());
            predicateElement.setAttribute("receiver", c.getReceiver());
            predicateElement.setAttribute("method", c.getMethod());
            predicateElement.setAttribute("operator", c.getOperator());
            Object argument = c.getArgument();
            if (argument == null) {
                argument = "";
            }
            predicateElement.setAttribute("argument", argument.toString());
            predicates.appendChild(predicateElement);
        }

    }

}