001    /**
002     * Copyright 2005-2012 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package edu.sampleu.travel.workflow;
017    
018    import org.kuali.rice.core.api.exception.RiceRuntimeException;
019    import org.kuali.rice.core.api.util.xml.XmlHelper;
020    import org.kuali.rice.kew.engine.RouteContext;
021    import org.kuali.rice.kew.framework.support.krms.RulesEngineExecutor;
022    import org.kuali.rice.kew.rule.xmlrouting.XPathHelper;
023    import org.kuali.rice.krms.api.engine.Engine;
024    import org.kuali.rice.krms.api.engine.EngineResults;
025    import org.kuali.rice.krms.api.engine.Facts;
026    import org.kuali.rice.krms.api.engine.SelectionCriteria;
027    import org.w3c.dom.Document;
028    
029    import javax.xml.xpath.XPath;
030    import javax.xml.xpath.XPathConstants;
031    import java.io.ByteArrayInputStream;
032    import java.util.Collections;
033    import java.util.HashMap;
034    import java.util.Map;
035    
036    /**
037     * A simple sample RulesEngineExecutor usable in the sample app which is hard-coded to select a context with
038     * namespaceCode="KR-SAP" and name="Travel Account ".  It also is hardcoded to select an agenda from the context with an
039     * event name of "workflow".
040     *
041     * @author Kuali Rice Team (rice.collab@kuali.org)
042     */
043    public class TravelAccountRulesEngineExecutor implements RulesEngineExecutor {
044    
045        private static final String CONTEXT_NAMESPACE_CODE = "KR-SAP";
046        private static final String CONTEXT_NAME = "Travel Account";
047    
048        @Override
049        public EngineResults execute(RouteContext routeContext, Engine engine) {
050            Map<String, String> contextQualifiers = new HashMap<String, String>();
051            contextQualifiers.put("namespaceCode", CONTEXT_NAMESPACE_CODE);
052            contextQualifiers.put("name", CONTEXT_NAME);
053            SelectionCriteria sectionCriteria = SelectionCriteria.createCriteria(null, contextQualifiers,
054                    Collections.singletonMap("Campus", "BL"));
055    
056            // extract facts from routeContext
057            String docContent = routeContext.getDocument().getDocContent();
058    
059            String subsidizedPercentStr = getElementValue(docContent, "//newMaintainableObject//subsidizedPercent");
060            String accountTypeCode =
061                    getElementValue(docContent, "//newMaintainableObject/dataObject/extension/accountTypeCode");
062            String initiator = getElementValue(docContent, "//documentInitiator//principalId");
063    
064            Facts.Builder factsBuilder = Facts.Builder.create();
065    
066            factsBuilder.addFact("Subsidized Percent", Double.valueOf(subsidizedPercentStr));
067            factsBuilder.addFact("Account Type Code", accountTypeCode);
068            factsBuilder.addFact("Initiator Principal ID", initiator);
069    
070            return engine.execute(sectionCriteria, factsBuilder.build(), null);
071        }
072    
073        private String getElementValue(String docContent, String xpathExpression) {
074            try {
075                Document document = XmlHelper.trimXml(new ByteArrayInputStream(docContent.getBytes()));
076    
077                XPath xpath = XPathHelper.newXPath();
078                String value = (String)xpath.evaluate(xpathExpression, document, XPathConstants.STRING);
079    
080                return value;
081    
082            } catch (Exception e) {
083                throw new RiceRuntimeException();
084            }
085        }
086    
087    //    public static void main(String [] args) throws Exception {
088    //
089    //        String sampleDocContent = FileUtils.readFileToString(new File("/home/gilesp/tmp/SampleDocContent.txt"));
090    //
091    //        RouteContext rc = new RouteContext();
092    //        DocumentRouteHeaderValue document = new DocumentRouteHeaderValue();
093    //        DocumentRouteHeaderValueContent content = new DocumentRouteHeaderValueContent();
094    //        content.setDocumentContent(sampleDocContent);
095    //        document.setDocumentContent(content);
096    //        rc.setDocument(document);
097    //
098    //        new TravelAccountRulesEngineExecutor().execute(rc, null);
099    //    }
100    }