org.kuali.rice.kew.rule.xmlrouting.WorkflowFunctionResolver.java Source code

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Here is the source code for org.kuali.rice.kew.rule.xmlrouting.WorkflowFunctionResolver.java

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/**
 * Copyright 2005-2014 The Kuali 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/ecl2.php
 *
 * 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.kuali.rice.kew.rule.xmlrouting;

import org.apache.commons.lang.StringUtils;
import org.kuali.rice.kew.api.WorkflowRuntimeException;
import org.kuali.rice.kew.api.rule.RuleExtension;
import org.kuali.rice.kew.xml.xstream.XStreamSafeSearchFunction;
import org.w3c.dom.Node;

import javax.xml.namespace.QName;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionResolver;
import java.util.List;
import java.util.Map;

/**
 * A function resolver for XPath functions provided by KEW.
 *
 * @author Kuali Rice Team (rice.collab@kuali.org)
 */
public class WorkflowFunctionResolver implements XPathFunctionResolver {

    private List<RuleExtension> ruleExtensions;
    private Node rootNode;
    private XPath xpath;

    public XPathFunction resolveFunction(QName fname, int arity) {
        if (fname == null) {
            throw new NullPointerException("The function name cannot be null.");
        }
        if (fname.equals(new QName("http://nothingfornowwf.com", "ruledata", "wf"))) {
            if (ruleExtensions == null) {
                throw new IllegalArgumentException("There are no rule extensions.");
            }
            return new XPathFunction() {
                public Object evaluate(List args) {
                    if (args.size() == 1) {
                        String name = (String) args.get(0);
                        for (RuleExtension ruleExtension : ruleExtensions) {
                            for (Map.Entry<String, String> entry : ruleExtension.getExtensionValuesMap()
                                    .entrySet()) {
                                if (entry.getKey().equals(name)) {
                                    return entry.getValue();
                                }
                            }
                        }
                    }
                    return "";
                }
            };
        } else if (fname.equals(new QName("http://nothingfornowwf.com", "xstreamsafe", "wf"))) {
            return new XStreamSafeSearchFunction(rootNode, this.getXpath());
        } else if (fname.equals(new QName("http://nothingfornowwf.com", "upper-case", "wf"))) {
            return new UpperCaseFunction();
        } else if (fname.equals(new QName("http://nothingfornowwf.com", "field", "wf"))) {
            return new XPathFunction() {
                public Object evaluate(java.util.List args) {
                    if (args.size() == 1) {
                        String name = (String) args.get(0);
                        try {
                            return field(name);
                        } catch (Exception e) {
                            throw new WorkflowRuntimeException("Failed to find field to validate.", e);
                        }
                    }
                    return "";
                }
            };
        } else if (fname.equals(new QName("http://nothingfornowwf.com", "empty", "wf"))) {
            return new XPathFunction() {
                public Object evaluate(java.util.List args) {
                    return empty(args.get(0));
                }
            };
        } else {
            return null;
        }
    }

    public String field(String fieldName) throws Exception {
        return xpath.evaluate("//edlContent/data/version[@current='true']/field[@name='" + fieldName + "']/value",
                rootNode);
    }

    public boolean empty(Object object) {
        if (object instanceof String) {
            return StringUtils.isBlank((String) object);
        }
        return object == null;
    }

    public List<RuleExtension> getRuleExtensions() {
        return this.ruleExtensions;
    }

    public void setRuleExtensions(List<RuleExtension> ruleExtensions) {
        this.ruleExtensions = ruleExtensions;
    }

    public Node getRootNode() {
        return rootNode;
    }

    public void setRootNode(Node rootNode) {
        this.rootNode = rootNode;
    }

    public XPath getXpath() {
        return xpath;
    }

    public void setXpath(XPath xpath) {
        this.xpath = xpath;
    }
}