com.saxonica.schema
Class ModelGroupParticle

java.lang.Object
  com.saxonica.schema.SchemaStructure
      com.saxonica.schema.SimpleComponentReference
          com.saxonica.schema.Particle
              com.saxonica.schema.ModelGroupParticle

All Implemented Interfaces:

ComponentReference, UserSchemaComponent, Serializable, SourceLocator, SchemaComponent

Direct Known Subclasses:

Edge.MaxOccursParticle

public class ModelGroupParticle
extends Particle
implements ComponentReference

A reference within the content model of a complex type to a Model Group Definition. Corresponds to a non-top-level xs:group element in a schema document, that is, an xs:group element with a ref attribute.

There is no direct equivalent of a ModelGroupParticle in the W3C schema component model, because in that model the structure of a complex type is always fully expanded: that is, any group references are replaced by the content of the group they refer to. This model retains group references to allow late binding and redefinition. However, methods are provided on the ModelGroup class to give a view of the content model in which the group references disappear.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.saxonica.schema.Particle

UNBOUNDED

Fields inherited from class com.saxonica.schema.SimpleComponentReference

nameCode, symbolSpace, target

Fields inherited from interface net.sf.saxon.type.SchemaComponent

FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING

Constructor Summary

ModelGroupParticle(EnterpriseConfiguration config, SourceLocator locator)
Creates a new Group reference

Method Summary

void	compile(SchemaCompiler compiler) Compile a particle
boolean	containsElementWildcard() Ask whether the particle contains an element wildcard
void	elaborate(SchemaCompiler compiler) Elaborate the schema component: after reloading a serialized schema component model, this expands the component with derived information needed during validation episodes.
boolean	fixup(SchemaCompiler compiler) Fix up references to other elements in the schema.
void	gatherAllPermittedElements(IntHashSet result, boolean ignoreWildcards) Find the set of all element particles allowed within the content model of this particle, identified by their integer fingerprints.
int	getElementParticleCardinality(int fingerprint) Find an element particle within this complex type definition having a given element name (identified by fingerprint), and return the cardinality associated with that element particle, that is, the number of times the element can occur within this complex type.
SchemaType	getElementParticleType(int fingerprint) Find an element particle within this complex type definition having a given element name (identified by fingerprint), and return the schema type associated with that element particle.
ModelGroup	getGroup()
int	getSymbolSpace() Get the symbol space of the target of this reference
SchemaComponent	getTarget() Returns the group that this group object is a reference to.
Term	getTerm() Get the term corresponding to this particle
boolean	isEmptiable() Determine if empty content is allowed
boolean	isPointless(ModelGroup container) Test whether the particle is pointless, as described in XML Schema Part 1 Schema Component Constraint: Particle Valid (Restriction)
boolean	isResolved() Determine whether this reference has been resolved
void	lookForCycles(Stack references, SchemaCompiler compiler) This method is called to look for cycles.
void	markVulnerableSubParticles() Mark the vulnerable subParticles of this particle
void	serializeParticle(SchemaModelSerializer serializer) Serialize the schema component as a particle
void	tryToResolve(SchemaCompiler compiler) Attempt to resolved this reference using the groups defined in a given schema.
boolean	validate(SchemaCompiler compiler) Checks the validity of this Schema definition.

Methods inherited from class com.saxonica.schema.Particle

computeParticleCardinality, getMaxOccurs, getMinOccurs, isVulnerable, setMaxOccurs, setMinOccurs, setVulnerable

Methods inherited from class com.saxonica.schema.SimpleComponentReference

getFingerprint, getNameCode, setNameCode, setTarget

Methods inherited from class com.saxonica.schema.SchemaStructure

getColumnNumber, getConfiguration, getFixupStatus, getLineNumber, getPublicId, getRedefinitionLevel, getSchemaDocumentURI, getSystemId, getValidationStatus, setConfiguration, setFixupStatus, setLineNumber, setLocator, setRedefinitionLevel, setSchemaDocumentURI, setSystemId, setValidationStatus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.saxonica.schema.ComponentReference

getConfiguration, getFingerprint

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Methods inherited from interface net.sf.saxon.type.SchemaComponent

getRedefinitionLevel, getValidationStatus

Constructor Detail

ModelGroupParticle

public ModelGroupParticle(EnterpriseConfiguration config,
                          SourceLocator locator)

Creates a new Group reference

Parameters:

config - the Configuration to which this Group belongs

locator - the location of the corresponding declaration in the source schema document

Method Detail

isResolved

public boolean isResolved()

Determine whether this reference has been resolved

Specified by:

isResolved in interface ComponentReference

Overrides:

isResolved in class SimpleComponentReference

Returns:

true if the reference has been resolved to a schema component

getGroup

public ModelGroup getGroup()
                    throws UnresolvedReferenceException

Throws:

UnresolvedReferenceException

getSymbolSpace

public int getSymbolSpace()

Get the symbol space of the target of this reference

Specified by:

getSymbolSpace in interface ComponentReference

Overrides:

getSymbolSpace in class SimpleComponentReference

Returns:

an integer code identifying the symbol space

isEmptiable

public boolean isEmptiable()
                    throws UnresolvedReferenceException

Determine if empty content is allowed

Specified by:

isEmptiable in class Particle

Returns:

true if the particle matches empty content

Throws:

UnresolvedReferenceException - if the schema contains an unresolved reference to a required component

fixup

public boolean fixup(SchemaCompiler compiler)
              throws SchemaException

Fix up references to other elements in the schema.

Specified by:

fixup in interface UserSchemaComponent

Specified by:

fixup in class Particle

Parameters:

compiler - the schema compiler

Returns:

true if successful

Throws:

SchemaException - if a fatal error occurs

lookForCycles

public void lookForCycles(Stack references,
                          SchemaCompiler compiler)
                   throws SchemaException,
                          UnresolvedReferenceException

This method is called to look for cycles. The object implementing this method is required (a) to raise an exception if the object itself appears in the list of references, (b) to add itself to the list of references, and (c) to call the lookForCycles method on all the objects that it references.

Specified by:

lookForCycles in interface UserSchemaComponent

Overrides:

lookForCycles in class SchemaStructure

Parameters:

references - A list of objects that contain direct or indirect references to this object, and that must therefore not be referred to from this object.

compiler - The schema compiler

Throws:

SchemaException

UnresolvedReferenceException

getTarget

public SchemaComponent getTarget()
                          throws UnresolvedReferenceException

Returns the group that this group object is a reference to. Note this method doesn't bind irrevocably to the target group declaration, because this may change following a redefine.

Specified by:

getTarget in interface ComponentReference

Overrides:

getTarget in class SimpleComponentReference

Returns:

the schema component if the reference has been resolved.

Throws:

UnresolvedReferenceException - if the reference has not been resolved. Note that this is an unchecked exception.

tryToResolve

public void tryToResolve(SchemaCompiler compiler)

Attempt to resolved this reference using the groups defined in a given schema. No error results if the reference cannot be resolved.

Specified by:

tryToResolve in interface ComponentReference

Overrides:

tryToResolve in class SimpleComponentReference

Parameters:

compiler - The compiler being used to compile the referring component. This is assumed to know about the schema containing the candidate target components for the reference. If null, the schema containing the reference is used.

isPointless

public boolean isPointless(ModelGroup container)

Test whether the particle is pointless, as described in XML Schema Part 1 Schema Component Constraint: Particle Valid (Restriction)

Specified by:

isPointless in class Particle

Parameters:

container - the model group containing this particle; null if there is no containing model group

Returns:

true if the particle is pointless (for example, a sequence of one item)

getElementParticleType

public SchemaType getElementParticleType(int fingerprint)

Find an element particle within this complex type definition having a given element name (identified by fingerprint), and return the schema type associated with that element particle. If there is no such particle, return null. If the fingerprint matches an element wildcard, return the type of the global element declaration with the given name if one exists, or AnyType if none exists and lax validation is permitted by the wildcard.

Specified by:

getElementParticleType in class Particle

Parameters:

fingerprint - Identifies the name of the child element within this content model

Returns:

the type of the element identified by the given name fingerprint. The consistency rule "Element Declarations Consistent" ensures that if there are multiple matching declarations, they have consistent types

getElementParticleCardinality

public int getElementParticleCardinality(int fingerprint)

Find an element particle within this complex type definition having a given element name (identified by fingerprint), and return the cardinality associated with that element particle, that is, the number of times the element can occur within this complex type. The value is one of StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ZERO_OR_ONE, StaticProperty.ALLOWS_ZERO_OR_MORE, StaticProperty.ALLOWS_ONE_OR_MORE, If there is no such particle, return StaticProperty.ALLOWS_ZERO.

Specified by:

getElementParticleCardinality in class Particle

Parameters:

fingerprint - Identifies the name of the child element within this content model

Returns:

the computed cardinality of this child element within the complex type

containsElementWildcard

public boolean containsElementWildcard()

Ask whether the particle contains an element wildcard

Specified by:

containsElementWildcard in class Particle

Returns:

true if the particle is an element wildcard, or contains one

gatherAllPermittedElements

public void gatherAllPermittedElements(IntHashSet result,
                                       boolean ignoreWildcards)
                                throws SchemaException

Find the set of all element particles allowed within the content model of this particle, identified by their integer fingerprints. Ignore wildcards.

Specified by:

gatherAllPermittedElements in class Particle

Parameters:

result - an initially-empty integer set in which the results are accumulated

ignoreWildcards - true if wildcard particles are to be ignored. If false, the resulting set will include the value -1 if wildcards are present in the content model

Throws:

SchemaException - if an error is found in the schema

markVulnerableSubParticles

public void markVulnerableSubParticles()

Mark the vulnerable subParticles of this particle

Overrides:

markVulnerableSubParticles in class Particle

validate

public boolean validate(SchemaCompiler compiler)
                 throws SchemaException

Checks the validity of this Schema definition.

Specified by:

validate in interface UserSchemaComponent

Specified by:

validate in class Particle

Parameters:

compiler - the schema compiler

Returns:

true if validation succeeded, false if errors were found.

Throws:

SchemaException

compile

public void compile(SchemaCompiler compiler)
             throws SchemaException

Compile a particle

Specified by:

compile in class Particle

Parameters:

compiler - the schema compmiler

Throws:

SchemaException - if a fatal error occurs

getTerm

public Term getTerm()

Get the term corresponding to this particle

Specified by:

getTerm in class Particle

Returns:

the corresponding term

elaborate

public void elaborate(SchemaCompiler compiler)
               throws SchemaException

Elaborate the schema component: after reloading a serialized schema component model, this expands the component with derived information needed during validation episodes. The model is assumed to be valid.

Specified by:

elaborate in interface UserSchemaComponent

Overrides:

elaborate in class SchemaStructure

Parameters:

compiler - the schema compiler

Throws:

SchemaException - if the schema is found to be invalid

serializeParticle

public void serializeParticle(SchemaModelSerializer serializer)
                       throws XPathException

Serialize the schema component as a particle

Specified by:

serializeParticle in class Particle

Parameters:

serializer - the object responsible for serialization

Throws:

XPathException - if serialization fails