SDO之类型不匹配的问题
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。