/**
    * Copyright 2005-2011 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.xml;
  
  import org.apache.commons.lang.BooleanUtils;
  import org.apache.commons.lang.StringUtils;
  import org.jdom.Attribute;
  import org.jdom.Document;
  import org.jdom.Element;
  import org.jdom.JDOMException;
  import org.kuali.rice.core.api.delegation.DelegationType;
  import org.kuali.rice.core.api.util.RiceConstants;
  import org.kuali.rice.core.api.util.xml.XmlException;
  import org.kuali.rice.core.api.util.xml.XmlHelper;
  import org.kuali.rice.kew.rule.RuleBaseValues;
  import org.kuali.rice.kew.rule.RuleDelegationBo;
  import org.kuali.rice.kew.rule.RuleTemplateOptionBo;
  import org.kuali.rice.kew.rule.bo.RuleAttribute;
  import org.kuali.rice.kew.rule.bo.RuleTemplateBo;
  import org.kuali.rice.kew.rule.bo.RuleTemplateAttributeBo;
  import org.kuali.rice.kew.service.KEWServiceLocator;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.xml.sax.SAXException;
  
  import javax.xml.parsers.ParserConfigurationException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.sql.Timestamp;
  import java.text.ParseException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.*;
  /**
   * Parses {@link org.kuali.rice.kew.rule.bo.RuleTemplateBo}s from XML.
   *
   * @see org.kuali.rice.kew.rule.bo.RuleTemplateBo
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class RuleTemplateXmlParser {
  
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(RuleTemplateXmlParser.class);
  
      /**
       * By default make attributes defined without a <required> element
       */
      private static final boolean DEFAULT_ATTRIBUTE_REQUIRED = true;
      private static final boolean DEFAULT_ATTRIBUTE_ACTIVE = true;
  
      /**
       * A dummy document type used in the default rule
       */
      private static final String DUMMY_DOCUMENT_TYPE = "dummyDocumentType";
  
      /**
       * Used to set the display order of attributes encountered in parsing runs during the lifetime of this object
       */
      private int templateAttributeCounter = 0;
  
      public List<RuleTemplateBo> parseRuleTemplates(InputStream input) throws IOException, XmlException {
  
          try {
              Document doc = XmlHelper.trimSAXXml(input);
              Element root = doc.getRootElement();
              return parseRuleTemplates(root);
          } catch (JDOMException e) {
              throw new XmlException("Parse error.", e);
          } catch (SAXException e) {
              throw new XmlException("Parse error.", e);
          } catch (ParserConfigurationException e) {
              throw new XmlException("Parse error.", e);
          }
      }
  
      public List<RuleTemplateBo> parseRuleTemplates(Element element) throws XmlException {
          List<RuleTemplateBo> ruleTemplates = new ArrayList<RuleTemplateBo>();
  
          // iterate over any RULE_TEMPLATES elements
          Collection<Element> ruleTemplatesElements = XmlHelper.findElements(element, RULE_TEMPLATES);
          Iterator ruleTemplatesIterator = ruleTemplatesElements.iterator();
          while (ruleTemplatesIterator.hasNext()) {
              Element ruleTemplatesElement = (Element) ruleTemplatesIterator.next();
              Collection<Element> ruleTemplateElements = XmlHelper.findElements(ruleTemplatesElement, RULE_TEMPLATE);
             for (Iterator iterator = ruleTemplateElements.iterator(); iterator.hasNext();) {
                 ruleTemplates.add(parseRuleTemplate((Element) iterator.next(), ruleTemplates));
             }
         }
         return ruleTemplates;
     }
 
     private RuleTemplateBo parseRuleTemplate(Element element, List<RuleTemplateBo> ruleTemplates) throws XmlException {
         String name = element.getChildText(NAME, RULE_TEMPLATE_NAMESPACE);
         String description = element.getChildText(DESCRIPTION, RULE_TEMPLATE_NAMESPACE);
         Attribute allowOverwriteAttrib = element.getAttribute("allowOverwrite");
 
         boolean allowOverwrite = false;
         if (allowOverwriteAttrib != null) {
             allowOverwrite = Boolean.valueOf(allowOverwriteAttrib.getValue()).booleanValue();
         }
         if (org.apache.commons.lang.StringUtils.isEmpty(name)) {
             throw new XmlException("RuleTemplate must have a name");
         }
         if (org.apache.commons.lang.StringUtils.isEmpty(description)) {
             throw new XmlException("RuleTemplate must have a description");
         }
 
         // look up the rule template by name first
         RuleTemplateBo ruleTemplate = KEWServiceLocator.getRuleTemplateService().findByRuleTemplateName(name);
 
         if (ruleTemplate == null) {
             // if it does not exist create a new one
             ruleTemplate = new RuleTemplateBo();
         } else {
             // if it does exist, update it, only if allowOverwrite is set
             if (!allowOverwrite) {
                 throw new RuntimeException("Attempting to overwrite template " + name + " without allowOverwrite set");
             }
 
             // the name should be equal if one was actually found
             assert(name.equals(ruleTemplate.getName())) : "Existing template definition name does not match incoming definition name";
         } 
 
         // overwrite simple properties
         ruleTemplate.setName(name);
         ruleTemplate.setDescription(description);
 
         // update the delegation template
         updateDelegationTemplate(element, ruleTemplate, ruleTemplates);
 
         // update the attribute relationships
         updateRuleTemplateAttributes(element, ruleTemplate);
 
         // save the rule template first so that the default/template rule that is generated
         // in the process of setting defaults is associated properly with this rule template
         KEWServiceLocator.getRuleTemplateService().save(ruleTemplate);
 
         // update the default options
         updateRuleTemplateDefaultOptions(element, ruleTemplate);
 
         KEWServiceLocator.getRuleTemplateService().save(ruleTemplate);
 
         return ruleTemplate;
     }
 
     /**
      * Updates the rule template default options.  Updates any existing options, removes any omitted ones.
      * @param ruleTemplateElement the rule template XML element
      * @param updatedRuleTemplate the RuleTemplate being updated
      * @throws XmlException
      */
     /*
      <element name="description" type="c:LongStringType"/>
      <element name="fromDate" type="c:ShortStringType" minOccurs="0"/>
      <element name="toDate" type="c:ShortStringType" minOccurs="0"/>
      <element name="forceAction" type="boolean"/>
      <element name="active" type="boolean"/>
      <element name="defaultActionRequested" type="c:ShortStringType"/>
      <element name="supportsComplete" type="boolean" default="true"/>
      <element name="supportsApprove" type="boolean" default="true"/>
      <element name="supportsAcknowledge" type="boolean" default="true"/>
      <element name="supportsFYI" type="boolean" default="true"/>
     */
     protected void updateRuleTemplateDefaultOptions(Element ruleTemplateElement, RuleTemplateBo updatedRuleTemplate) throws XmlException {
         Element defaultsElement = ruleTemplateElement.getChild(RULE_DEFAULTS, RULE_TEMPLATE_NAMESPACE);
 
         // update the rule defaults; this yields whether or not this is a delegation rule template
         boolean isDelegation = updateRuleDefaults(defaultsElement, updatedRuleTemplate);
 
         // update the rule template options
         updateRuleTemplateOptions(defaultsElement, updatedRuleTemplate, isDelegation);
 
     }
 
     /**
      * Updates the rule template defaults options with those in the defaults element
      * @param defaultsElement the ruleDefaults element
      * @param updatedRuleTemplate the Rule Template being updated
      */
     protected void updateRuleTemplateOptions(Element defaultsElement, RuleTemplateBo updatedRuleTemplate, boolean isDelegation) throws XmlException {
         // the possible defaults options
         // NOTE: the current implementation will remove any existing RuleTemplateOption records for any values which are null, i.e. not set in the incoming XML.
         // to pro-actively set default values for omitted options, simply set those values here, and records will be added if not present
         String defaultActionRequested = null;
         Boolean supportsComplete = null;
         Boolean supportsApprove = null;
         Boolean supportsAcknowledge = null;
         Boolean supportsFYI = null;
         
         // remove any RuleTemplateOptions the template may have but that we know we aren't going to update/reset
         // (not sure if this case even exists...does anything else set rule template options?)
         updatedRuleTemplate.removeNonDefaultOptions();
         
         // read in new settings
         if (defaultsElement != null) {
 
         	defaultActionRequested = defaultsElement.getChildText(DEFAULT_ACTION_REQUESTED, RULE_TEMPLATE_NAMESPACE);
             supportsComplete = BooleanUtils.toBooleanObject(defaultsElement.getChildText(SUPPORTS_COMPLETE, RULE_TEMPLATE_NAMESPACE));
             supportsApprove = BooleanUtils.toBooleanObject(defaultsElement.getChildText(SUPPORTS_APPROVE, RULE_TEMPLATE_NAMESPACE));
             supportsAcknowledge = BooleanUtils.toBooleanObject(defaultsElement.getChildText(SUPPORTS_ACKNOWLEDGE, RULE_TEMPLATE_NAMESPACE));
             supportsFYI = BooleanUtils.toBooleanObject(defaultsElement.getChildText(SUPPORTS_FYI, RULE_TEMPLATE_NAMESPACE));
         }
 
         if (!isDelegation) {
             // if this is not a delegation template, store the template options that govern rule action constraints
             // in the RuleTemplateOptions of the template
             // we have two options for this behavior:
             // 1) conditionally parse above, and then unconditionally set/unset the properties; this will have the effect of REMOVING
             //    any of these previously specified rule template options (and is arguably the right thing to do)
             // 2) unconditionally parse above, and then conditionally set/unset the properties; this will have the effect of PRESERVING
             //    the existing rule template options on this template if it is a delegation template (which of course will be overwritten
             //    by this very same code if they subsequently upload without the delegation flag)
             // This is a minor point, but the second implementation is chosen as it preserved the current behavior
             updateOrDeleteRuleTemplateOption(updatedRuleTemplate, KewApiConstants.ACTION_REQUEST_DEFAULT_CD, defaultActionRequested);
             updateOrDeleteRuleTemplateOption(updatedRuleTemplate, KewApiConstants.ACTION_REQUEST_APPROVE_REQ, supportsApprove);
             updateOrDeleteRuleTemplateOption(updatedRuleTemplate, KewApiConstants.ACTION_REQUEST_ACKNOWLEDGE_REQ, supportsAcknowledge);
             updateOrDeleteRuleTemplateOption(updatedRuleTemplate, KewApiConstants.ACTION_REQUEST_FYI_REQ, supportsFYI);
             updateOrDeleteRuleTemplateOption(updatedRuleTemplate, KewApiConstants.ACTION_REQUEST_COMPLETE_REQ, supportsComplete);
         }
 
     }
     
     /**
      * 
      * Updates the default/template rule options with those in the defaults element
      * @param defaultsElement the ruleDefaults element
      * @param updatedRuleTemplate the Rule Template being updated
      * @return whether this is a delegation rule template
      */
     protected boolean updateRuleDefaults(Element defaultsElement, RuleTemplateBo updatedRuleTemplate) throws XmlException {
         // NOTE: implementation detail: in contrast with the other options, the delegate template, and the rule attributes,
         // we unconditionally blow away the default rule and re-create it (we don't update the existing one, if there is one)
         if (updatedRuleTemplate.getId() != null) {
             RuleBaseValues ruleDefaults = KEWServiceLocator.getRuleService().findDefaultRuleByRuleTemplateId(updatedRuleTemplate.getId());
             if (ruleDefaults != null) {
                 List ruleDelegationDefaults = KEWServiceLocator.getRuleDelegationService().findByDelegateRuleId(ruleDefaults.getId());
                 // delete the rule
                 KEWServiceLocator.getRuleService().delete(ruleDefaults.getId());
                 // delete the associated rule delegation defaults
                 for (Iterator iterator = ruleDelegationDefaults.iterator(); iterator.hasNext();) {
                     RuleDelegationBo ruleDelegation = (RuleDelegationBo) iterator.next();
                     KEWServiceLocator.getRuleDelegationService().delete(ruleDelegation.getRuleDelegationId());
                 }
             }
         }
 
         boolean isDelegation = false;
 
         if (defaultsElement != null) {
             String delegationTypeCode = defaultsElement.getChildText(DELEGATION_TYPE, RULE_TEMPLATE_NAMESPACE);
             DelegationType delegationType = null;
             isDelegation = !org.apache.commons.lang.StringUtils.isEmpty(delegationTypeCode);
 
             String description = defaultsElement.getChildText(DESCRIPTION, RULE_TEMPLATE_NAMESPACE);
             
             // would normally be validated via schema but might not be present if invoking RuleXmlParser directly
             if (description == null) {
                 throw new XmlException("Description must be specified in rule defaults");
             }
             
             String fromDate = defaultsElement.getChildText(FROM_DATE, RULE_TEMPLATE_NAMESPACE);
             String toDate = defaultsElement.getChildText(TO_DATE, RULE_TEMPLATE_NAMESPACE);
             // toBooleanObject ensures that if the value is null (not set) that the Boolean object will likewise be null (will not default to a value)
             Boolean forceAction = BooleanUtils.toBooleanObject(defaultsElement.getChildText(FORCE_ACTION, RULE_TEMPLATE_NAMESPACE));
             Boolean active = BooleanUtils.toBooleanObject(defaultsElement.getChildText(ACTIVE, RULE_TEMPLATE_NAMESPACE));
 
             if (isDelegation) {
                 delegationType = DelegationType.parseCode(delegationTypeCode);
                 if (delegationType == null) {
                     throw new XmlException("Invalid delegation type '" + delegationType + "'." + "  Expected one of: "
                                             + DelegationType.PRIMARY.getCode() + "," + DelegationType.SECONDARY.getCode());
                 }
             }
     
             // create our "default rule" which encapsulates the defaults for the rule
             RuleBaseValues ruleDefaults = new RuleBaseValues();
     
             // set simple values
             ruleDefaults.setRuleTemplate(updatedRuleTemplate);
             ruleDefaults.setDocTypeName(DUMMY_DOCUMENT_TYPE);
             ruleDefaults.setTemplateRuleInd(Boolean.TRUE);
             ruleDefaults.setCurrentInd(Boolean.TRUE);
             ruleDefaults.setVersionNbr(new Integer(0));
             ruleDefaults.setDescription(description);
     
             // these are non-nullable fields, so default them if they were not set in the defaults section
             ruleDefaults.setForceAction(Boolean.valueOf(BooleanUtils.isTrue(forceAction)));
             ruleDefaults.setActive(Boolean.valueOf(BooleanUtils.isTrue(active)));
         
             if (ruleDefaults.getActivationDate() == null) {
                 ruleDefaults.setActivationDate(new Timestamp(System.currentTimeMillis()));
             }
     
             ruleDefaults.setFromDateValue(formatDate("fromDate", fromDate));
             ruleDefaults.setToDateValue(formatDate("toDate", toDate));
             
             // ok, if this is a "Delegate Template", then we need to set this other RuleDelegation object which contains
             // some delegation-related info
             RuleDelegationBo ruleDelegationDefaults = null;
             if (isDelegation) {
                 ruleDelegationDefaults = new RuleDelegationBo();
                 ruleDelegationDefaults.setDelegationRule(ruleDefaults);
                 ruleDelegationDefaults.setDelegationType(delegationType);
                 ruleDelegationDefaults.setResponsibilityId(KewApiConstants.ADHOC_REQUEST_RESPONSIBILITY_ID);
             }
 
             // explicitly save the new rule delegation defaults and default rule
             KEWServiceLocator.getRuleTemplateService().saveRuleDefaults(ruleDelegationDefaults, ruleDefaults);
         } else {
             // do nothing, rule defaults will be deleted if ruleDefaults element is omitted
         }
         
         return isDelegation;
     }
 
 
     /**
      * Updates or deletes a specified rule template option on the rule template
      * @param updatedRuleTemplate the RuleTemplate being updated
      * @param key the option key
      * @param value the option value
      */
     protected void updateOrDeleteRuleTemplateOption(RuleTemplateBo updatedRuleTemplate, String key, Object value) {
         if (value != null) {
             // if the option exists and the incoming value is non-null (it's set), update it
             RuleTemplateOptionBo option = updatedRuleTemplate.getRuleTemplateOption(key);
             if (option != null) {
                 option.setValue(value.toString());
             } else {
                 updatedRuleTemplate.getRuleTemplateOptions().add(new RuleTemplateOptionBo(key, value.toString()));
             }
         } else {
             // otherwise if the incoming value IS null (not set), then explicitly remove the entry (if it exists)
             Iterator<RuleTemplateOptionBo> options = updatedRuleTemplate.getRuleTemplateOptions().iterator();
             while (options.hasNext()) {
                 RuleTemplateOptionBo opt = options.next();
                 if (key.equals(opt.getCode())) {
                     options.remove();
                     break;
                 }
             }
         }
     }
 
     /**
      * Updates the rule template delegation template with the one specified in the XML (if any)
      * @param ruleTemplateElement the XML ruleTemplate element
      * @param updatedRuleTemplate the rule template to update
      * @param parsedRuleTemplates the rule templates parsed in this parsing run
      * @throws XmlException if a delegation template was specified but could not be found
      */
     protected void updateDelegationTemplate(Element ruleTemplateElement, RuleTemplateBo updatedRuleTemplate, List<RuleTemplateBo> parsedRuleTemplates) throws XmlException {
         String delegateTemplateName = ruleTemplateElement.getChildText(DELEGATION_TEMPLATE, RULE_TEMPLATE_NAMESPACE);
 
         if (delegateTemplateName != null) {
             // if a delegateTemplate was set in the XML, then look it up and set it on the RuleTemplate object
             // first try looking up an existing delegateTemplate in the system
             RuleTemplateBo delegateTemplate = KEWServiceLocator.getRuleTemplateService().findByRuleTemplateName(delegateTemplateName);
 
             // if not found, try the list of templates currently parsed
             if (delegateTemplate == null) {
                 for (RuleTemplateBo rt: parsedRuleTemplates) {
                     if (delegateTemplateName.equalsIgnoreCase(rt.getName())) {
                         // set the expected next rule template id on the target delegateTemplate
                     	String ruleTemplateId = KEWServiceLocator.getRuleTemplateService().getNextRuleTemplateId();
                         rt.setId(ruleTemplateId);
                         delegateTemplate = rt;
                         break;
                     }
                 }
             }
 
             if (delegateTemplate == null) {
                 throw new XmlException("Cannot find delegation template " + delegateTemplateName);
             }
 
             updatedRuleTemplate.setDelegationTemplateId(delegateTemplate.getDelegationTemplateId());
             updatedRuleTemplate.setDelegationTemplate(delegateTemplate);           
         } else {
             // the previously referenced template is left in the system
         }
     }
 
     /**
      * Updates the attributes set on the RuleTemplate
      * @param ruleTemplateElement the XML ruleTemplate element
      * @param updatedRuleTemplate the RuleTemplate being updated
      * @throws XmlException if there was a problem parsing the rule template attributes
      */
     protected void updateRuleTemplateAttributes(Element ruleTemplateElement, RuleTemplateBo updatedRuleTemplate) throws XmlException {
         // add any newly defined rule template attributes to the rule template,
         // update the active and required flags of any existing ones.
         // if this is an update of an existing rule template, related attribute objects will be present in this rule template object,
         // otherwise none will be present (so they'll all be new)
 
         Element attributesElement = ruleTemplateElement.getChild(ATTRIBUTES, RULE_TEMPLATE_NAMESPACE);
         List<RuleTemplateAttributeBo> incomingAttributes = new ArrayList<RuleTemplateAttributeBo>();
         if (attributesElement != null) {
             incomingAttributes.addAll(parseRuleTemplateAttributes(attributesElement, updatedRuleTemplate));
         }
 
         // inactivate all current attributes
         for (RuleTemplateAttributeBo currentRuleTemplateAttribute: updatedRuleTemplate.getRuleTemplateAttributes()) {
             String ruleAttributeName = (currentRuleTemplateAttribute.getRuleAttribute() != null) ? currentRuleTemplateAttribute.getRuleAttribute().getName() : "(null)";
             LOG.debug("Inactivating rule template attribute with id " + currentRuleTemplateAttribute.getId() + " and rule attribute with name " + ruleAttributeName);
             currentRuleTemplateAttribute.setActive(Boolean.FALSE);
         }
         // NOTE: attributes are deactivated, not removed
 
         // add/update any new attributes
         for (RuleTemplateAttributeBo ruleTemplateAttribute: incomingAttributes) {
             RuleTemplateAttributeBo potentialExistingTemplateAttribute = updatedRuleTemplate.getRuleTemplateAttribute(ruleTemplateAttribute);
             if (potentialExistingTemplateAttribute != null) {
                 // template attribute exists on rule template already; update the options
                 potentialExistingTemplateAttribute.setActive(ruleTemplateAttribute.getActive());
                 potentialExistingTemplateAttribute.setRequired(ruleTemplateAttribute.getRequired());
             } else {
                 // template attribute does not yet exist on template so add it
                 updatedRuleTemplate.getRuleTemplateAttributes().add(ruleTemplateAttribute);
             }
         }
     }
 
     /**
      * Parses the RuleTemplateAttributes defined on the rule template element
      * @param attributesElement the jdom Element object for the Rule Template attributes
      * @param ruleTemplate the RuleTemplate object
      * @return the RuleTemplateAttributes defined on the rule template element
      * @throws XmlException
      */
     private List<RuleTemplateAttributeBo> parseRuleTemplateAttributes(Element attributesElement, RuleTemplateBo ruleTemplate) throws XmlException {
         List<RuleTemplateAttributeBo> ruleTemplateAttributes = new ArrayList<RuleTemplateAttributeBo>();
         Collection<Element> attributeElements = XmlHelper.findElements(attributesElement, ATTRIBUTE);
         for (Iterator iterator = attributeElements.iterator(); iterator.hasNext();) {
             ruleTemplateAttributes.add(parseRuleTemplateAttribute((Element) iterator.next(), ruleTemplate));
         }
         return ruleTemplateAttributes;
     }
 
     /**
      * Parses a rule template attribute
      * @param element the attribute XML element
      * @param ruleTemplate the ruleTemplate to update
      * @return a parsed rule template attribute
      * @throws XmlException if the attribute does not exist
      */
     private RuleTemplateAttributeBo parseRuleTemplateAttribute(Element element, RuleTemplateBo ruleTemplate) throws XmlException {
         String attributeName = element.getChildText(NAME, RULE_TEMPLATE_NAMESPACE);
         String requiredValue = element.getChildText(REQUIRED, RULE_TEMPLATE_NAMESPACE);
         String activeValue = element.getChildText(ACTIVE, RULE_TEMPLATE_NAMESPACE);
         if (org.apache.commons.lang.StringUtils.isEmpty(attributeName)) {
             throw new XmlException("Attribute name must be non-empty");
         }
         boolean required = DEFAULT_ATTRIBUTE_REQUIRED;
         if (requiredValue != null) {
             required = Boolean.parseBoolean(requiredValue);
         }
         boolean active = DEFAULT_ATTRIBUTE_ACTIVE;
         if (activeValue != null) {
             active = Boolean.parseBoolean(activeValue);
         }
         RuleAttribute ruleAttribute = KEWServiceLocator.getRuleAttributeService().findByName(attributeName);
         if (ruleAttribute == null) {
             throw new XmlException("Could not locate rule attribute for name '" + attributeName + "'");
         }
         RuleTemplateAttributeBo templateAttribute = new RuleTemplateAttributeBo();
         templateAttribute.setRuleAttribute(ruleAttribute);
         templateAttribute.setRuleAttributeId(ruleAttribute.getId());
         templateAttribute.setRuleTemplate(ruleTemplate);
         templateAttribute.setRequired(Boolean.valueOf(required));
         templateAttribute.setActive(Boolean.valueOf(active));
         templateAttribute.setDisplayOrder(new Integer(templateAttributeCounter++));
         return templateAttribute;
     }
     
     public Timestamp formatDate(String dateLabel, String dateString) throws XmlException {
     	if (StringUtils.isBlank(dateString)) {
     		return null;
     	}
     	try {
     		return new Timestamp(RiceConstants.getDefaultDateFormat().parse(dateString).getTime());
     	} catch (ParseException e) {
     		throw new XmlException(dateLabel + " is not in the proper format.  Should have been: " + RiceConstants.DEFAULT_DATE_FORMAT_PATTERN);
     	}
     }
 
 }