使用xerces sax库的XSModel
作为xsd语法的表示,如果我有一个引用模型组的复杂类型,如何检索模型组?似乎Xerces提供的由XSModel
实例表示的复杂类型定义只提供对组的扁平(扩展)内容(即组的元素)的访问,而不提供实际组或对组定义(甚至组的名称)的引用;XSModelGroupImpl
-方法由getName()
..组成。
最佳答案
模型组很容易被xerces发现。
但是,您应该使用org.apache.xerces.xs
包。
模型组可以在顶级声明中找到,也可以作为复杂类型中的粒子找到。
这里有一个Java代码示例:
import org.apache.xerces.xs.*;
import org.apache.xerces.dom.DOMXSImplementationSourceImpl;
....
/**
* Load an XSD file
*/
void loadSchema (String xsdURI)
{
XSImplementation impl = (XSImplementation)
(new DOMXSImplementationSourceImpl()).getDOMImplementation ("XS-Loader");
XSLoader schemaLoader = impl.createXSLoader (null);
XSModel xsModel = schemaLoader.loadURI (xsdURI);
}
/**
* Process schema content
*/
private void processXSModel (XSModel xsModel)
{
XSNamedMap xsMap;
// process model group definitions
xsMap = xsModel.getComponents (XSConstants.MODEL_GROUP_DEFINITION);
for (int i = 0; i < xsMap.getLength(); i ++)
{
XSModelGroupDefinition xsGroupDef = (XSModelGroupDefinition) xsMap.item (i);
XSModelGroup xsGroup = xsGroupDef.getModelGroup();
...
}
// process top-level type definitions
xsMap = xsModel.getComponents (XSConstants.TYPE_DEFINITION);
for (int i = 0; i < xsMap.getLength(); i ++)
{
XSTypeDefinition xsTDef = (XSTypeDefinition) xsMap.item (i);
processXSTypeDef (xsTDef);
}
// process top-level element declarations
xsMap = xsModel.getComponents (XSConstants.ELEMENT_DECLARATION);
for (int i = 0; i < xsMap.getLength(); i ++)
{
XSElementDeclaration xsElementDecl = (XSElementDeclaration) xsMap.item (i);
processXSElementDecl (xsElementDecl);
}
}
/**
* Process type definition
*/
private void processXSTypeDef (XSTypeDefinition xsTDef)
{
switch (xsTDef.getTypeCategory())
{
case XSTypeDefinition.SIMPLE_TYPE:
processXSSimpleType ((XSSimpleTypeDefinition) xsTDef);
break;
case XSTypeDefinition.COMPLEX_TYPE:
XSComplexTypeDefinition xsCTDef = (XSComplexTypeDefinition) xsTDef;
// element's attributes
XSObjectList xsAttrList = xsCTDef.getAttributeUses();
for (int i = 0; i < xsAttrList.getLength(); i ++)
{
processXSAttributeUse ((XSAttributeUse) xsAttrList.item (i));
}
// element content
switch (xsCTDef.getContentType())
{
case XSComplexTypeDefinition.CONTENTTYPE_EMPTY:
break;
case XSComplexTypeDefinition.CONTENTTYPE_SIMPLE:
parseValueType (xsCTDef.getSimpleType());
break;
case XSComplexTypeDefinition.CONTENTTYPE_ELEMENT:
processXSParticle (xsCTDef.getParticle());
break;
case XSComplexTypeDefinition.CONTENTTYPE_MIXED:
...
processXSParticle (xsCTDef.getParticle());
break;
}
}
break;
}
/**
* Process particle
*/
private void processXSParticle (XSParticle xsParticle)
{
XSTerm xsTerm = xsParticle.getTerm();
switch (xsTerm.getType())
{
case XSConstants.ELEMENT_DECLARATION:
processXSElementDecl ((XSElementDeclaration) xsTerm);
break;
case XSConstants.MODEL_GROUP:
// this is one of the globally defined groups
// (found in top-level declarations)
XSModelGroup xsGroup = (XSModelGroup) xsTerm;
// it also consists of particles
XSObjectList xsParticleList = xsGroup.getParticles();
for (int i = 0; i < xsParticleList.getLength(); i ++)
{
processXSParticle ((XSParticle) xsParticleList.item (i));
}
...
break;
case XSConstants.WILDCARD:
...
break;
}
}
关于xml - XSModel:获取模型组信息,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/19745906/