/*

  * Copyright 2007 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.krad.workflow;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Map;

 import java.util.Properties;

 import javax.xml.xpath.XPath;

 import javax.xml.xpath.XPathExpressionException;

 import javax.xml.xpath.XPathFactory;

 import org.apache.commons.lang.StringUtils;

 import org.kuali.rice.kew.engine.RouteContext;

 import org.kuali.rice.kew.rule.xmlrouting.WorkflowFunctionResolver;

 import org.kuali.rice.kew.rule.xmlrouting.WorkflowNamespaceContext;

 import org.kuali.rice.kns.util.FieldUtils;

 import org.kuali.rice.kns.web.ui.Field;

 import org.kuali.rice.kns.web.ui.Row;

 import org.kuali.rice.krad.service.KRADServiceLocatorWeb;

 import org.kuali.rice.krad.util.KRADConstants;

 import org.kuali.rice.krad.util.KRADPropertyConstants;

 import org.kuali.rice.krad.util.UrlFactory;

 import org.w3c.dom.Document;

 public final class WorkflowUtils {

     private static final String XPATH_ROUTE_CONTEXT_KEY = "_xpathKey";

     public static final String XSTREAM_SAFE_PREFIX = "wf:xstreamsafe('";

     public static final String XSTREAM_SAFE_SUFFIX = "')";

     public static final String XSTREAM_MATCH_ANYWHERE_PREFIX = "//";

     public static final String XSTREAM_MATCH_RELATIVE_PREFIX = "./";

         private WorkflowUtils() {

                 throw new UnsupportedOperationException("do not call");

         }

     /**

      *

      * This method sets up the XPath with the correct workflow namespace and resolver initialized. This ensures that the XPath

      * statements can use required workflow functions as part of the XPath statements.

      *

      * @param document - document

      * @return a fully initialized XPath instance that has access to the workflow resolver and namespace.

      *

      */

     public final static XPath getXPath(Document document) {

         XPath xpath = getXPath(RouteContext.getCurrentRouteContext());

         xpath.setNamespaceContext(new WorkflowNamespaceContext());

         WorkflowFunctionResolver resolver = new WorkflowFunctionResolver();

         resolver.setXpath(xpath);

         resolver.setRootNode(document);

         xpath.setXPathFunctionResolver(resolver);

         return xpath;

     }

     public final static XPath getXPath(RouteContext routeContext) {

         if (routeContext == null) {

             return XPathFactory.newInstance().newXPath();

         }

         if (!routeContext.getParameters().containsKey(XPATH_ROUTE_CONTEXT_KEY)) {

             routeContext.getParameters().put(XPATH_ROUTE_CONTEXT_KEY, XPathFactory.newInstance().newXPath());

         }

         return (XPath) routeContext.getParameters().get(XPATH_ROUTE_CONTEXT_KEY);

     }

     /**

      * This method will do a simple XPath.evaluate, while wrapping your xpathExpression with the xstreamSafe function. It assumes a

      * String result, and will return such. If an XPathExpressionException is thrown, this will be re-thrown within a

      * RuntimeException.

      *

      * @param xpath A correctly initialized XPath instance.

      * @param xpathExpression Your XPath Expression that needs to be wrapped in an xstreamSafe wrapper and run.

      * @param item The document contents you will be searching within.

      * @return The string value of the xpath.evaluate().

      */

     public static final String xstreamSafeEval(XPath xpath, String xpathExpression, Object item) {

         String xstreamSafeXPath = xstreamSafeXPath(xpathExpression);

         String evalResult = "";

         try {

             evalResult = xpath.evaluate(xstreamSafeXPath, item);

         }

         catch (XPathExpressionException e) {

             throw new RuntimeException("XPathExpressionException occurred on xpath: " + xstreamSafeXPath, e);

         }

         return evalResult;

     }

     /**

      * This method wraps the passed-in XPath expression in XStream Safe wrappers, so that XStream generated reference links will be

      * handled correctly.

      *

      * @param xpathExpression The XPath Expression you wish to use.

      * @return Your XPath Expression wrapped in the XStreamSafe wrapper.

      */

     public static final String xstreamSafeXPath(String xpathExpression) {

         return new StringBuilder(XSTREAM_SAFE_PREFIX).append(xpathExpression).append(XSTREAM_SAFE_SUFFIX).toString();

     }

     /**

      * This method is for use by WorkflowLookupableImpl and WorkflowAttribute implementations to derive the fieldHelpUrl for use on

      * org.kuali.rice.krad.web.ui.Fieldss.

      *

      * @param field The kuali field that we need to derive a help url for. @ return Returns the help url for the field.

      */

     public static String getHelpUrl(Field field) {

         Properties params = new Properties();

         params.put(KRADConstants.DISPATCH_REQUEST_PARAMETER, "getAttributeHelpText");

         params.put(KRADConstants.BUSINESS_OBJECT_CLASS_ATTRIBUTE, field.getBusinessObjectClassName());

         params.put(KRADPropertyConstants.ATTRIBUTE_NAME, field.getPropertyName());

         String baseUrl = KRADServiceLocatorWeb.getRiceApplicationConfigurationMediationService().getBaseHelpUrl(field.getBusinessObjectClassName());

         if (baseUrl == null) {

                 return null;

         }

         return UrlFactory.parameterizeUrl(baseUrl, params);

     }

     /**

      * This method returns a label from the data dictionary service

      *

      * @param businessObjectClass - class where the label should come from

      * @param attributeName - name of the attribute you need the label for

      * @return the label from the data dictionary for the given Class and attributeName or null if not found

      */

     public static final String getBusinessObjectAttributeLabel(Class businessObjectClass, String attributeName) {

         return KRADServiceLocatorWeb.getDataDictionaryService().getAttributeLabel(businessObjectClass, attributeName);

     }

     /**

      * This method builds a workflow-lookup-screen Row of type TEXT, with no quickfinder/lookup.

      *

      * @param propertyClass The Class of the BO that this row is based on. For example, Account.class for accountNumber.

      * @param boPropertyName The property name on the BO that this row is based on. For example, accountNumber for

      *        Account.accountNumber.

      * @param workflowPropertyKey The workflow-lookup-screen property key. For example, account_nbr for Account.accountNumber. This

      *        key can be anything, but needs to be consistent with what is used for the row/field key on the java attribute, so

      *        everything links up correctly.

      * @return A populated and ready-to-use workflow lookupable.Row.

      */

     public static Row buildTextRow(Class propertyClass, String boPropertyName, String workflowPropertyKey) {

         if (propertyClass == null) {

             throw new IllegalArgumentException("Method parameter 'propertyClass' was passed a NULL value.");

         }

         if (StringUtils.isBlank(boPropertyName)) {

             throw new IllegalArgumentException("Method parameter 'boPropertyName' was passed a NULL or blank value.");

         }

         if (StringUtils.isBlank(workflowPropertyKey)) {

             throw new IllegalArgumentException("Method parameter 'workflowPropertyKey' was passed a NULL or blank value.");

         }

         List<Field> fields = new ArrayList<Field>();

         Field field;

         field = FieldUtils.getPropertyField(propertyClass, boPropertyName, false);

         fields.add(field);

         return new Row(fields);

     }

     /**

      * This method builds a workflow-lookup-screen Row of type TEXT, with the attached lookup icon and functionality.

      *

      * @param propertyClass The Class of the BO that this row is based on. For example, Account.class for accountNumber.

      * @param boPropertyName The property name on the BO that this row is based on. For example, accountNumber for

      *        Account.accountNumber.

      * @param workflowPropertyKey The workflow-lookup-screen property key. For example, account_nbr for Account.accountNumber. This

      *        key can be anything, but needs to be consistent with what is used for the row/field key on the java attribute, so

      *        everything links up correctly.

      * @return A populated and ready-to-use workflow lookupable.Row, which includes both the property field and the lookup icon.

      */

     public static Row buildTextRowWithLookup(Class propertyClass, String boPropertyName, String workflowPropertyKey) {

         return buildTextRowWithLookup(propertyClass, boPropertyName, workflowPropertyKey, null);

     }

     /**

      * This method builds a workflow-lookup-screen Row of type TEXT, with the attached lookup icon and functionality.

      *

      * @param propertyClass The Class of the BO that this row is based on. For example, Account.class for accountNumber.

      * @param boPropertyName The property name on the BO that this row is based on. For example, accountNumber for

      *        Account.accountNumber.

      * @param workflowPropertyKey The workflow-lookup-screen property key. For example, account_nbr for Account.accountNumber. This

      *        key can be anything, but needs to be consistent with what is used for the row/field key on the java attribute, so

      *        everything links up correctly.

      * @param fieldConversionsByBoPropertyName A list of extra field conversions where the key is the business object property name

      *        and the value is the workflow property key

      * @return A populated and ready-to-use workflow lookupable.Row, which includes both the property field and the lookup icon.

      */

     public static Row buildTextRowWithLookup(Class propertyClass, String boPropertyName, String workflowPropertyKey, Map fieldConversionsByBoPropertyName) {

         if (propertyClass == null) {

             throw new IllegalArgumentException("Method parameter 'propertyClass' was passed a NULL value.");

         }

         if (StringUtils.isBlank(boPropertyName)) {

             throw new IllegalArgumentException("Method parameter 'boPropertyName' was passed a NULL or blank value.");

         }

         if (StringUtils.isBlank(workflowPropertyKey)) {

             throw new IllegalArgumentException("Method parameter 'workflowPropertyKey' was passed a NULL or blank value.");

         }

         Field field;

         field = FieldUtils.getPropertyField(propertyClass, boPropertyName, false);

         List<Field> fields = new ArrayList<Field>();

         fields.add(field);

         return new Row(fields);

     }

     /**

      * This method builds a workflow-lookup-screen Row of type DROPDOWN.

      *

      * @param propertyClass The Class of the BO that this row is based on. For example, Account.class for accountNumber.

      * @param boPropertyName The property name on the BO that this row is based on. For example, accountNumber for

      *        Account.accountNumber.

      * @param workflowPropertyKey The workflow-lookup-screen property key. For example, account_nbr for Account.accountNumber. This

      *        key can be anything, but needs to be consistent with what is used for the row/field key on the java attribute, so

      *        everything links up correctly.

      * @param optionMap The map of value, text pairs that will be used to constuct the dropdown list.

      * @return A populated and ready-to-use workflow lookupable.Row.

      */

     public static Row buildDropdownRow(Class propertyClass, String boPropertyName, String workflowPropertyKey, Map<String, String> optionMap, boolean addBlankRow) {

         if (propertyClass == null) {

             throw new IllegalArgumentException("Method parameter 'propertyClass' was passed a NULL value.");

         }

         if (StringUtils.isBlank(boPropertyName)) {

             throw new IllegalArgumentException("Method parameter 'boPropertyName' was passed a NULL or blank value.");

         }

         if (StringUtils.isBlank(workflowPropertyKey)) {

             throw new IllegalArgumentException("Method parameter 'workflowPropertyKey' was passed a NULL or blank value.");

         }

         if (optionMap == null) {

             throw new IllegalArgumentException("Method parameter 'optionMap' was passed a NULL value.");

         }

         List<Field> fields = new ArrayList<Field>();

         Field field;

         field = FieldUtils.getPropertyField(propertyClass, boPropertyName, false);

         fields.add(field);

         return new Row(fields);

     }

 }