Downloaded 74 times
![XSModelGroup // XSModelGroup modelGroup Compositor comp = modelGroup.getCompositor(); if(comp.equals(Compositor.SEQUENCE)){ // } else if(comp.equals(Compositor.ALL)){ // } else if(comp.equals(Compositor.CHOICE)){ // } XSParticle[] particles = modelGroup.getChildren(); for (int i = 0; i < particles.length; i++) { XSTerm term = particles[i].getTerm(); // .... }](https://image.slidesharecdn.com/java-20and-20xml-20schema-131102171403-phpapp01/75/Java-and-XML-Schema-19-2048.jpg)
Uploaded byRaji Ghawi
Java and XML Schema
This document discusses using the XML Schema Object Model (XSOM) in Java to parse and analyze XML schemas. It shows how to: - Parse an XML schema file using an XSOMParser - Examine the schema set, schemas, elements, attributes, types and facets defined in the schema - Navigate complex types and terms to analyze element declarations, model groups, wildcards etc. - Inspect simple types to check if they are restrictions, unions, lists and get base types and facets The code examples demonstrate how to retrieve and describe the different parts of an XML schema using the XSOM API.
Java and XML Schema
- 1. Java and XMLSchema XSOM XML Schema Object Model Raji GHAWI 19/01/2009
- 2.
- 3. Create the parser XSOMParserparser = new XSOMParser(); parser.setErrorHandler(new MyErrorHandler());
- 4. MyErrorHandler public class MyErrorHandlerimplements ErrorHandler{ public void warning(SAXParseException se){ System.err.println("warning : "+se.getMessage()); } public void error(SAXParseException se){ System.err.println("error : "+se.getMessage()); } public void fatalError(SAXParseException se){ System.err.println("fatal error : "+se.getMessage()); } }
- 5. Parse an XMLschema file try { parser.parse(new File("./example.xsd")); // .... } catch (IOException ioe) { ioe.printStackTrace(); } catch (SAXException se) { se.printStackTrace(); }
- 6. XSSchemaSet XSSchemaSet schemaSet =parser.getResult(); Iterator<XSSchema> schemaIter = schemaSet.iterateSchema(); while (schemaIter.hasNext()) { XSSchema schema = (XSSchema) schemaIter.next(); if(schema.getTargetNamespace(). equals("http://www.w3.org/2001/XMLSchema")) continue; // .... }
- 7. <xs:element name="product"> <xs:complexType> <xs:attribute name="prodid"type="xs:positiveInteger" /> </xs:complexType> </xs:element> anonymous complex type <xs:element name="member" type="personinfo" /> <xs:complexType name="personinfo"> <xs:sequence> <xs:element name="firstname" type="xs:string" /> <xs:element name="lastname" type="xs:string" /> </xs:sequence> </xs:complexType> named complex type <xs:element name="car" default="Audi"> <xs:simpleType> <xs:restriction base="xs:string"> <xs:enumeration value="Audi" /> <xs:enumeration value="Golf" /> <xs:enumeration value="BMW" /> </xs:restriction> </xs:simpleType> </xs:element> anonymous simple type <xs:element name="car2" type="carType" fixed="BMW" /> <xs:simpleType name="carType"> <xs:restriction base="xs:string"> <xs:enumeration value="Audi" /> <xs:enumeration value="Golf" /> <xs:enumeration value="BMW" /> </xs:restriction> </xs:simpleType> named simple type <xs:element name="dateborn" type="xs:date" abstract="true" /> primitive type
- 8. Elements System.out.println("--------- elements ---------"); Iterator<XSElementDecl>elemIter = schema.iterateElementDecls(); while (elemIter.hasNext()) { XSElementDecl elem = elemIter.next(); System.out.println(describeElement(elem)); }
- 9. Elements public static StringdescribeElement(XSElementDecl elem) { String txt = elem.getName(); XSType type = elem.getType(); txt += (" t ("+type.toString()+")"); if (elem.isGlobal()) txt += " (global)"; else if (elem.isLocal()) txt += " (local)"; if (elem.isAbstract()) txt += " t(abstract)"; XmlString defaultValue = elem.getDefaultValue(); if(defaultValue!=null){ txt += " t(default='"+defaultValue+"')"; } } XmlString fixedValue = elem.getFixedValue(); if(fixedValue!=null){ txt += " t(fixed='"+fixedValue+"')"; } return txt; --------- elements --------car (anonymous simple type) (global) (default='Audi') member (personinfo complex type) (global) product (anonymous complex type) (global) dateborn (date simple type) (global) (abstract) car2 (carType simple type) (global) (fixed='BMW')
- 10. Attributes System.out.println("--------- attributes ---------"); Iterator<XSAttributeDecl>attIter = schema.iterateAttributeDecls(); while (attIter.hasNext()) { XSAttributeDecl att = attIter.next(); System.out.println(describeAttribute(att)); }
- 11. Attributes public static StringdescribeAttribute(XSAttributeDecl att) { String txt = att.getName()+" t "+att.getType().getName(); XmlString defaultValue = att.getDefaultValue(); if(defaultValue!=null){ txt += " t(default='"+defaultValue+"')"; } XmlString fixedValue = att.getFixedValue(); if(fixedValue!=null){ txt += " t(fixed='"+fixedValue+"')"; } // isRequired ?? return txt; } <xs:attribute <xs:attribute <xs:attribute <xs:attribute name="lang1" name="lang2" name="lang3" name="lang4" type="xs:string" type="xs:string" type="xs:string" type="xs:string" /> default="EN" /> fixed="EN" /> use="required" /> --------- attributes --------lang1 string lang3 string (fixed='EN') lang2 string (default='EN') lang4 string
- 12. Types System.out.println("--------- types ---------"); Iterator<XSType>typeIter = schema.iterateTypes(); while (typeIter.hasNext()) { XSType st = typeIter.next(); System.out.println(describeType(st)); }
- 13. Types public static StringdescribeType(XSType type) { String txt = ""; if(type.isAnonymous()) txt += "(anonymous)"; else txt += type.getName(); if (type.isGlobal()) txt += " (global)"; else if (type.isLocal()) txt += " (local)"; if(type.isComplexType()) txt += " (complex)"; else if(type.isSimpleType()) txt += " (simple)"; } int deriv = type.getDerivationMethod(); switch(deriv){ case XSType.EXTENSION: txt += " (EXTENSION)"; break; case XSType.RESTRICTION: txt += " (RESTRICTION)"; break; case XSType.SUBSTITUTION: txt += " (SUBSTITUTION)"; break; } return txt; --------- types --------carType (global) (simple) (RESTRICTION) personinfo (global) (complex) (RESTRICTION) Global Types only !!
- 14. How to getall types ? public static Vector<XSType> allTypes = new Vector<XSType>(); Iterator<XSType> typeIter = schema.iterateTypes(); while (typeIter.hasNext()) { XSType st = typeIter.next(); allTypes.addElement(st); } // .... System.out.println("--------- types ---------"); for (int i = 0; i < allTypes.size(); i++) { XSType type = allTypes.get(i); System.out.println(describeType(type)); } public static String describeElement(XSElementDecl elem) { String txt = elem.getName(); XSType type = elem.getType(); if(!allTypes.contains(type)){ allTypes.addElement(type); } // .... } primitive type !! --------- types --------carType (global) (simple) (RESTRICTION) personinfo (global) (complex) (RESTRICTION) (anonymous) (local) (simple) (RESTRICTION) (anonymous) (local) (complex) (RESTRICTION) date (global) (simple) (RESTRICTION)
- 15. How to ignoreprimitive types ? public static String describeElement(XSElementDecl elem) { String txt = elem.getName(); XSType type = elem.getType(); if(!allTypes.contains(type)){ if(type.isSimpleType()){ if(!type.asSimpleType().isPrimitive()){ allTypes.addElement(type); } } else { allTypes.addElement(type); } } // .... } --------- types --------carType (global) (simple) (RESTRICTION) personinfo (global) (complex) (RESTRICTION) (anonymous) (local) (simple) (RESTRICTION) (anonymous) (local) (complex) (RESTRICTION)
- 16. Complex and SimpleTypes // XSType type if(type.isComplexType()){ XSComplexType complex = type.asComplexType(); // } else if(type.isSimpleType()){ XSSimpleType simple = type.asSimpleType(); // } schema.iterateSimpleTypes(); schema.iterateComplexTypes();
- 17. XSComplexType // XSComplexType complex XSContentTypecontenetType = complex.getContentType(); if(contenetType instanceof EmptyImpl){ XSContentType empty = contenetType.asEmpty(); // } else if(contenetType instanceof ParticleImpl){ XSTerm term = contenetType.asParticle().getTerm(); // } else if(contenetType instanceof SimpleTypeImpl){ XSSimpleType st = contenetType.asSimpleType(); // }
- 18. XSTerm // XSTerm term if(term.isElementDecl()){ XSElementDecl elem= term.asElementDecl(); // } else if(term.isModelGroup()){ XSModelGroup mg = term.asModelGroup(); // } else if(term.isModelGroupDecl()){ XSModelGroupDecl mgd = term.asModelGroupDecl(); XSModelGroup mg = mgd.getModelGroup(); // } else if(term.isWildcard()){ XSWildcard wildcard = term.asWildcard(); // }
- 19. XSModelGroup // XSModelGroup modelGroup Compositorcomp = modelGroup.getCompositor(); if(comp.equals(Compositor.SEQUENCE)){ // } else if(comp.equals(Compositor.ALL)){ // } else if(comp.equals(Compositor.CHOICE)){ // } XSParticle[] particles = modelGroup.getChildren(); for (int i = 0; i < particles.length; i++) { XSTerm term = particles[i].getTerm(); // .... }
- 20. XSSimpleType // XSSimpleType simpe if(simple.isList()){ XSListSimpleTypelst = simple.asList(); // } else if(simple.isUnion()){ XSUnionSimpleType ust = simple.asUnion(); // } else if(simple.isRestriction()){ XSRestrictionSimpleType rst = simple.asRestriction(); // }
- 21. XSRestrictionSimpleType // XSRestrictionSimpleType restriction XSTypebaseType = restriction.getBaseType(); // .... Iterator<?> facets = restriction.getDeclaredFacets().iterator(); while (facets.hasNext()) { XSFacet facet = (XSFacet) facets.next(); String name = facet.getName(); XmlString value = facet.getValue(); if(name.equalsIgnoreCase("enumeration")){ // } else if(name.equalsIgnoreCase("minInclusive")){ // } else if(name.equalsIgnoreCase("minExclusive")){ // } else if(name.equalsIgnoreCase("maxInclusive")){ // } else if(name.equalsIgnoreCase("maxExclusive")){ // } else if(name.equalsIgnoreCase("whiteSpace")){ // } }
- 22. References https://xsom.dev.java.net/ (Kohsuke Kawaguchi, SunMicrosystems ) http://www.stylusstudio.com/w3c/schema0/_index.htm