SDO之类型不匹配的问题

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Eclipse Java Apache thread 工作

由于工作的原因，接触了SDO，在研发的过程中遇到很多类型转换方面的问题，网上相应的中文资料比较少，自己总结了一些tip，希望对大家有所帮助

将一个DataObject赋予另一个同schema生成的DataObject时，报

Exception in thread "main" java.lang.ClassCastException: The feature 'ReceiveOrder's type 
'ReceiveOrder' does not permit a 
value of type 'ReceiveOrder'
	at org.eclipse.emf.ecore.impl.EStructuralFeatureImpl$BasicFeatureMapEntry.
validate(EStructuralFeatureImpl.java:2843)
	at org.eclipse.emf.ecore.util.FeatureMapUtil.createEntry(FeatureMapUtil.java:146)
	at org.eclipse.emf.ecore.util.BasicFeatureMap.createEntry(BasicFeatureMap.java:94)
	at org.eclipse.emf.ecore.util.BasicFeatureMap.set(BasicFeatureMap.java:1051)
	at org.eclipse.emf.ecore.util.FeatureMapUtil$FeatureValue.set(FeatureMapUtil.java:1149)
	at org.eclipse.emf.ecore.impl.EStructuralFeatureImpl$InternalSettingDelegateFeatureMapDelegator
.dynamicSet(EStructuralFeatureImpl.java:1401)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eDynamicSet(BasicEObjectImpl.java:709)
	at org.apache.tuscany.sdo.impl.DynamicDataObjectImpl.eDynamicSet(DynamicDataObjectImpl.java:160)
	at org.apache.tuscany.sdo.impl.DataObjectImpl.eSet(DataObjectImpl.java:1476)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSet(BasicEObjectImpl.java:654)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:204)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:160)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:167)
	at org.apache.tuscany.sdo.helper.XMLHelperImpl.save(XMLHelperImpl.java:168)
	at org.apache.tuscany.sdo.helper.XMLHelperImpl.save(XMLHelperImpl.java:130)

我们看下试验的代码：

//从字符串创造DataObject
                String dataObjectStr = 
			 "<m:ReceiveOrder xmlns:m=\"http://ordertomanufacturingservice.services.starflow.ro.icss.com/wsdl\">" +
			       "<orderId>testreciiveServcice11111</orderId>" +
			       "<customerId>String</customerId>" +
			       "<customerName>String</customerName>" +
			       "<orderItems>" +
			          "<orderItem>	" +
			             "<productName>String</productName>" +
			             "<price>3.1415926535897932384626433832795</price>" +
			             "<quantity>String</quantity>" +
			             "<comment>String</comment>" +
			             "<shipDate>String</shipDate>	" +
			           "</orderItem>" +
			        "</orderItems>" +
			  "</m:ReceiveOrder>";

                //创造第一个DataObject
		 HelperContext scope =  SDOUtil.createHelperContext();
		 loadTypesFromXMLSchemaStr(scope,schema3);
		 XMLDocument xmlDoc = getXMLDocumentFromString(scope,dataObjectStr);
		 DataObject root = xmlDoc.getRootObject();
		 
		//创造第二个DataObject
		 HelperContext scope2 =  SDOUtil.createHelperContext();
		 DataObject obj = createRootDataObject(scope2,schema3,"ReceiveOrder");
		 
		 //将第一个DO赋予第二个DO
		 obj = root;
		 String xmlstr = scope2.getXMLHelper().save(obj, getNameSpaceFromSchema(schema3), 
                      "ReceiveOrder");
		 System.out.println(xmlstr);

              /**
	        * 从字符串中获取XMLDocument对象
	        * @param scope
	        * @param xmlDoc
	        * @return
	        * @throws IOException
	        */
               private static XMLDocument getXMLDocumentFromString(HelperContext scope, 
                        String xmlDoc) throws IOException {
		InputStream is = new ByteArrayInputStream(xmlDoc.getBytes());
		XMLDocument result = scope.getXMLHelper().load(is);
		return result;
	       }

            /**
	      * 创建文档的顶层DO
	      * @param schemaStr
	      * @param type
	      * @return
	      * @throws UnsupportedEncodingException
	      * @throws FileNotFoundException
	      */
             private static DataObject createRootDataObject(HelperContext scope,String schemaStr
                    ,String type) throws UnsupportedEncodingException, FileNotFoundException{
		loadTypesFromXMLSchemaStr(scope,schemaStr);
		DataFactory factory = scope.getDataFactory();         
		DataObject root = factory.create(getNameSpaceFromSchema(schemaStr),type);
		return root;
	      }

打印结果如下：

Exception in thread "main" java.lang.ClassCastException: The feature 'ReceiveOrder's type
 'ReceiveOrder' does not permit a value of type 'ReceiveOrder'
	at org.eclipse.emf.ecore.impl.EStructuralFeatureImpl$BasicFeatureMapEntry
.validate(EStructuralFeatureImpl.java:2843)
	at org.eclipse.emf.ecore.util.FeatureMapUtil.createEntry(FeatureMapUtil.java:146)
	at org.eclipse.emf.ecore.util.BasicFeatureMap.createEntry(BasicFeatureMap.java:94)
	at org.eclipse.emf.ecore.util.BasicFeatureMap.set(BasicFeatureMap.java:1051)
	at org.eclipse.emf.ecore.util.FeatureMapUtil$FeatureValue.set(FeatureMapUtil.java:1149)
	at org.eclipse.emf.ecore.impl.EStructuralFeatureImpl$InternalSettingDelegateFeatureMapDelegator
.dynamicSet(EStructuralFeatureImpl.java:1401)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eDynamicSet(BasicEObjectImpl.java:709)
	at org.apache.tuscany.sdo.impl.DynamicDataObjectImpl.eDynamicSet(DynamicDataObjectImpl.java:160)
	at org.apache.tuscany.sdo.impl.DataObjectImpl.eSet(DataObjectImpl.java:1476)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSet(BasicEObjectImpl.java:654)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:204)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:160)
	at org.apache.tuscany.sdo.helper.XMLDocumentImpl.save(XMLDocumentImpl.java:167)
	at org.apache.tuscany.sdo.helper.XMLHelperImpl.save(XMLHelperImpl.java:168)
	at org.apache.tuscany.sdo.helper.XMLHelperImpl.save(XMLHelperImpl.java:130)
	at com.icss.ro.starflow.service.mappingservice.Test2.main(Test2.java:305)

这就奇怪了，我明明用同样的schema创建的两个对象，按照java中最基本的赋值原则，我这样直接给DO赋值也应该没错啊，百思不得其解。仔细观察发现，两个DO虽然属于同一个schema，但隶属于不同的HelperContext,问题会不会出在这里呢，我们再试验下，代码修改为：

               //创造第一个DataObject
		 HelperContext scope =  SDOUtil.createHelperContext();
		 loadTypesFromXMLSchemaStr(scope,schema3);
		 XMLDocument xmlDoc = getXMLDocumentFromString(scope,dataObjectStr);
		 DataObject root = xmlDoc.getRootObject();
		 
		//创造第二个DataObject
		 HelperContext scope2 =  SDOUtil.createHelperContext();
		 DataObject obj = createRootDataObject(scope,schema3,"ReceiveOrder");
		 
		 //将第一个DO赋予第二个DO
		 obj = root;
		 String xmlstr = scope.getXMLHelper().save(obj, getNameSpaceFromSchema(schema3), 
                      "ReceiveOrder");
		 System.out.println(xmlstr);

这时的打印结果为：

<?xml version="1.0" encoding="UTF-8"?>
<tns:ReceiveOrder xmlns:tns="http://ordertomanufacturingservice.services.starflow.ro.icss.com/wsdl">
  <orderId>testreciiveServcice11111</orderId>
  <customerId>String</customerId>
  <customerName>String</customerName>
  <orderItems>
    <orderItem>
      <productName>String</productName>
      <price>3.1415926535897932384626433832795</price>
      <quantity>String</quantity>
      <comment>String</comment>
      <shipDate>String</shipDate>
    </orderItem>
  </orderItems>
</tns:ReceiveOrder>

通过这个例子，我们发现，如果要给两个DO赋值的话，它不单要隶属于同一个xsd文件的同一个类型，而且还要隶属同一个HelperConetxt,否则就要报如上的异常了。

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