org.kuali.coeus.common.framework.krms.KcRulesEngineExecuter.java Source code

Introduction

Here is the source code for org.kuali.coeus.common.framework.krms.KcRulesEngineExecuter.java

Source

/*
 * Kuali Coeus, a comprehensive research administration system for higher education.
 * 
 * Copyright 2005-2015 Kuali, Inc.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kuali.coeus.common.framework.krms;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.kuali.coeus.sys.framework.service.KcServiceLocator;
import org.kuali.rice.core.api.exception.RiceRuntimeException;
import org.kuali.rice.core.api.util.xml.XmlHelper;
import org.kuali.rice.kew.engine.RouteContext;
import org.kuali.rice.kew.framework.support.krms.RulesEngineExecutor;
import org.kuali.rice.kew.rule.xmlrouting.XPathHelper;
import org.kuali.rice.krms.api.engine.Engine;
import org.kuali.rice.krms.api.engine.EngineResults;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import java.io.ByteArrayInputStream;

public abstract class KcRulesEngineExecuter implements RulesEngineExecutor {

    protected final Log LOG = LogFactory.getLog(KcRulesEngineExecuter.class);

    @Override
    public EngineResults execute(RouteContext routeContext, Engine engine) {
        KcServiceLocator.getService(KcKrmsCacheManager.class).clearCache();
        return performExecute(routeContext, engine);
    }

    protected String getElementValue(String docContent, String xpathExpression) {
        try {
            Document document = XmlHelper.trimXml(new ByteArrayInputStream(docContent.getBytes()));

            XPath xpath = XPathHelper.newXPath();
            String value = (String) xpath.evaluate(xpathExpression, document, XPathConstants.STRING);

            return value;

        } catch (Exception e) {
            throw new RiceRuntimeException(e.getMessage(), e);
        }
    }

    protected NodeList getElementValueAsNodeList(String docContent, String xpathExpression) {
        try {
            Document document = XmlHelper.trimXml(new ByteArrayInputStream(docContent.getBytes()));

            XPath xpath = XPathHelper.newXPath();
            NodeList value = (NodeList) xpath.evaluate(xpathExpression, document, XPathConstants.NODESET);

            return value;

        } catch (Exception e) {
            throw new RiceRuntimeException(e.getMessage(), e);
        }
    }

    protected abstract EngineResults performExecute(RouteContext routeContext, Engine engine);

}