自定義分配任務通知

Assign Task元件用於將任務分配給工作流參與者。將任務分配給用戶或組時，會向定義的用戶或組成員發送電子郵件通知。
此電子郵件通知通常包含與任務相關的動態資料。使用系統生成的元資料屬性讀取此動態資料。
若要在電子郵件通知中包含已提交表單資料的值，我們需要建立自訂中繼資料屬性，然後在電子郵件範本中使用這些自訂中繼資料屬性

建立自訂中繼資料屬性

建議的方法是建立OSGI元件，以實作WorkitemUserMetadataService的getUserMetadata方法

下列程式碼會建立4個中繼資料屬性（firstName、lastName、reason和amountRequested），並從提交的資料設定其值。例如，中繼資料屬性firstName的值會從提交的資料設定為名為firstName的元素的值。下列程式碼假設最適化表單的已提交資料為xml格式。以JSON結構描述或表單資料模型為基礎的最適化Forms會產生JSON格式的資料。

package com.aemforms.workitemuserservice.core;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.jcr.Session;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;

import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.*;


import com.adobe.fd.workspace.service.external.WorkitemUserMetadataService;
import com.adobe.granite.workflow.WorkflowSession;
import com.adobe.granite.workflow.exec.WorkItem;
import com.adobe.granite.workflow.metadata.MetaDataMap;
@Component(property={Constants.SERVICE_DESCRIPTION+"=A sample implementation of a user metadata service.",
Constants.SERVICE_VENDOR+"=Adobe Systems",
"process.label"+"=Sample Custom Metadata Service"})


public class WorkItemUserServiceImpl implements WorkitemUserMetadataService {
private static final Logger log = LoggerFactory.getLogger(WorkItemUserServiceImpl.class);

@Override
public Map<String, String> getUserMetadata(WorkItem workItem, WorkflowSession workflowSession,MetaDataMap metadataMap)
{
HashMap<String, String> customMetadataMap = new HashMap<String, String>();
String payloadPath = workItem.getWorkflowData().getPayload().toString();
String dataFilePath = payloadPath + "/Data.xml/jcr:content";
Session session = workflowSession.adaptTo(Session.class);
DocumentBuilderFactory factory = null;
DocumentBuilder builder = null;
Document xmlDocument = null;
javax.jcr.Node xmlDataNode = null;
try
{
    xmlDataNode = session.getNode(dataFilePath);
    InputStream xmlDataStream = xmlDataNode.getProperty("jcr:data").getBinary().getStream();
    XPath xPath = javax.xml.xpath.XPathFactory.newInstance().newXPath();
    factory = DocumentBuilderFactory.newInstance();
    builder = factory.newDocumentBuilder();
    xmlDocument = builder.parse(xmlDataStream);
    Node firstNameNode = (org.w3c.dom.Node) xPath.compile("afData/afUnboundData/data/firstName")
            .evaluate(xmlDocument, javax.xml.xpath.XPathConstants.NODE);
    log.debug("The value of first name element  is " + firstNameNode.getTextContent());
    Node lastNameNode = (org.w3c.dom.Node) xPath.compile("afData/afUnboundData/data/lastName")
            .evaluate(xmlDocument, javax.xml.xpath.XPathConstants.NODE);
    Node amountRequested = (org.w3c.dom.Node) xPath
            .compile("afData/afUnboundData/data/amountRequested")
            .evaluate(xmlDocument, javax.xml.xpath.XPathConstants.NODE);
    Node reason = (org.w3c.dom.Node) xPath.compile("afData/afUnboundData/data/reason")
            .evaluate(xmlDocument, javax.xml.xpath.XPathConstants.NODE);
    customMetadataMap.put("firstName", firstNameNode.getTextContent());
    customMetadataMap.put("lastName", lastNameNode.getTextContent());
    customMetadataMap.put("amountRequested", amountRequested.getTextContent());
    customMetadataMap.put("reason", reason.getTextContent());
    log.debug("Created  " + customMetadataMap.size() + " metadata  properties");

}
catch (Exception e)
{
    log.debug(e.getMessage());
}
return customMetadataMap;
}

}