使用SDO跟踪XML数据的变化

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="http://www.example.com/PO"
    xmlns:sdo="commonj.sdo"
    xmlns:sdoxml="commonj.sdo/xml"
targetNamespace="http://www.example.com/PO">

<xsd:import namespace="commonj.sdo/xml"
schemaLocation="C:\\eclipse\\workspace\\SDO\\src\\main\\resources\\sdo.xsd" />
    <xsd:element name="purchaseOrder" type="PurchaseOrderType"/>
    <xsd:element name="comment" type="xsd:string"/>
    <xsd:element name="status" type="StatusType"/>

<xsd:complexType name="PurchaseOrderType">
        <xsd:sequence>
            <xsd:element name="shipTo" type="USAddress"/>
            <xsd:element name="billTo" type="USAddress"/>
            <xsd:element ref="comment" minOccurs="0"/>
            <xsd:element name="items"  type="Items"/>
            <xsd:element ref="status" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="changes" type="sdo:ChangeSummaryType"/>
        </xsd:sequence>
        <xsd:attribute name="orderDate" type="xsd:date"/>
    </xsd:complexType>
   ......
</xsd:schema>

<?xml version="1.0" encoding="ASCII"?>
<po:purchaseOrder xmlns:po="http://www.example.com/PO" orderDate="1999-10-20">
  <shipTo country="US">
    <name>Alice Smith</name>
    <street>123 Maple Street</street>
    <city>Mill Valley</city>
    <state>CA</state>
    <zip>90952</zip>
  </shipTo>
  <billTo country="US">
    <name>Alice Smith</name>
    <street>8 Oak Avenue</street>
    <city>Mill Valley</city>
    <state>PA</state>
    <zip>95819</zip>
  </billTo>
  <po:comment>Hurry, my lawn is going wild!</po:comment>
  <items>
    <item partNum="872-AA">
      <productName>Lawnmower</productName>
      <price>148.95</price>
      <quantity>1</quantity>
      <po:comment>Confirm this is electric</po:comment>
    </item>
    <item partNum="926-AA">
      <productName>Baby Monitor</productName>
      <price>39.98</price>
      <quantity>2</quantity>
      <shipDate>2007-11-21</shipDate>
    </item>
    <item partNum="999-AA">
      <productName>Armed Chair</productName>
      <price>299.95</price>
      <quantity>1</quantity>
      <po:comment>Make sure the cover is leather.</po:comment>
    </item>
  </items>
  <changes create="     ##//items/item[3]" delete="     ##//changes/items[1]/item[3]" logging="false" xmlns:sdo="commonj.sdo">
    <billTo sdo:ref="     ##//billTo">
      <name>Robert Smith</name>
    </billTo>
    <item sdo:ref="     ##//items/item[2]">
      <quantity>1</quantity>
    </item>
    <items sdo:ref="     ##//items">
      <item sdo:ref="     ##//items/item[1]" />
      <item sdo:ref="     ##//items/item[2]" />
      <item partNum="998-AA"><productName>Carpet</productName><price>439.98</price><quantity>1</quantity><shipDate>2007-12-01</shipDate></item>
    </items>
  </changes>
</po:purchaseOrder>

public static void printChangeSummary(ChangeSummary chngSum) {
if (chngSum == null) {
System.out.println("ChangeSummary is not in existence!");
return;
}
for (Iterator it = chngSum.getChangedDataObjects().iterator(); it.hasNext();) {
DataObject changedObject = (DataObject) it.next();
System.out.println();
if (chngSum.isCreated(changedObject)) {//is the changed object newly created
                System.out.println("Created: " + changedObject);
if (changedObject.getContainer()!=null){
System.out.println("\t--- to be contained in : "
                        + changedObject.getContainer().getType().getName()
+ " ---");
}else{
System.out.println("\t--- created object has no container --- ");
}
printAnnotatedDataObject("newly created",changedObject, 2);
} else if (chngSum.isDeleted(changedObject)) {
System.out.println("Deleted: " + changedObject);
if (chngSum.getOldContainer(changedObject) != null){
System.out.println("\t--- originally contained in : " + chngSum.getOldContainer(changedObject).getType().getName() + " ---");
}else{
System.out.println("\t--- deleted object has no container ---");
}
// a potential bug in Tuscany SDO, this shows nothing in ProcessPO.java
                printAnnotatedDataObject("deleted",changedObject, 2);
// drill down to deleted property
                System.out.println("\t--- deleted property information --- ");
// a potential bug in Tuscany SDO, this section shows nothing in ReviewPO.java
                for (Iterator settingIt = chngSum.getOldValues(changedObject).iterator(); settingIt.hasNext();) {
printDeletedProperty((ChangeSummary.Setting) settingIt.next());
}
System.out.println("\t--- deleted property information --- ");
} else if (chngSum.isModified(changedObject)) {
System.out.println("Updated:  " + changedObject);
// print out the updated object
                printAnnotatedDataObject("after update", changedObject, 2);
// drill down to changed property
                System.out.println("\t--- property update information --- ");
for (Iterator settingIt = chngSum.getOldValues(changedObject).iterator(); settingIt.hasNext();) {
ChangeSummary.Setting changeSetting = (ChangeSummary.Setting) settingIt.next();
printUpdatedProperty(changeSetting, changedObject,chngSum);
}
System.out.println("\t--- property update information --- ");
} else
                System.out.println("Should never come here!");
}
}