com.saxonica.schema
Class GroupReference

java.lang.Object
  com.saxonica.schema.SchemaStructure
      com.saxonica.schema.AbstractParticle
          com.saxonica.schema.GroupReference

All Implemented Interfaces:

ComponentReference, Particle, SerializableSchemaComponent, UserSchemaComponent, Serializable, SourceLocator, SchemaComponent

public class GroupReference
extends AbstractParticle
implements ComponentReference, UserSchemaComponent

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 GroupReference 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 Compositor 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.AbstractParticle

UNBOUNDED

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

FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING

Fields inherited from interface com.saxonica.schema.SerializableSchemaComponent

ALL_COMPOSITOR, ATOMIC_TYPE, ATTRIBUTE_DECL, ATTRIBUTE_GROUP, ATTRIBUTE_GROUP_REF, ATTRIBUTE_USE, ATTRIBUTE_WILDCARD, CHOICE_COMPOSITOR, COMPLEX_TYPE, ELEMENT_DECL, ELEMENT_PARTICLE, ELEMENT_WILDCARD, FACET, KEY, KEYREF, LIST_TYPE, MODEL_GROUP, MODEL_GROUP_REF, NOTATION, SEQUENCE_COMPOSITOR, UNION_TYPE, UNIQUE

Constructor Summary

GroupReference(PreparedSchema schema, SourceLocator locator)
Creates a new Group definition

Method Summary

void	compile(SchemaCompiler compiler) Compile a particle
boolean	fixup(SchemaCompiler compiler) Fix up references to other elements in the schema.
void	gatherAllPermittedElements(IntHashSet result) Find the set of all element particles allowed within the content model of this particle, identified by their integer fingerprints.
int	getComponentTypeCode() Get a unique number identifying the type of component
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.
int	getFingerprint() Get the fingerprint of the target of this reference
ModelGroupDefinition	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	isResolved() Determine whether this reference has been resolved
void	lookForCycles(Stack references, SchemaCompiler compiler) This method is called to look for cycles.
void	serialize(SchemaSerializer serializer) Serialize the schema component
void	setFingerprint(int fingerprint)
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.AbstractParticle

computeParticleCardinality, getMaxOccurs, getMinOccurs, isPointless, setMaxOccurs, setMinOccurs

Methods inherited from class com.saxonica.schema.SchemaStructure

getColumnNumber, getConfiguration, getFixupStatus, getLineNumber, getPublicId, getSystemId, getValidationStatus, setConfiguration, setFixupStatus, setLineNumber, setLocator, setSystemId, setValidationStatus

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.saxonica.schema.ComponentReference

getConfiguration

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

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

getValidationStatus

Constructor Detail

GroupReference

public GroupReference(PreparedSchema schema,
                      SourceLocator locator)

Creates a new Group definition

Parameters:

schema - the XML Schema to which this Group belongs

Method Detail

isResolved

public boolean isResolved()

Determine whether this reference has been resolved

Specified by:

isResolved in interface ComponentReference

getGroup

public ModelGroupDefinition getGroup()
                              throws UnresolvedReferenceException

Throws:

UnresolvedReferenceException

setFingerprint

public void setFingerprint(int fingerprint)

getFingerprint

public int getFingerprint()

Description copied from interface: ComponentReference

Get the fingerprint of the target of this reference

Specified by:

getFingerprint in interface ComponentReference

getSymbolSpace

public int getSymbolSpace()

Get the symbol space of the target of this reference

Specified by:

getSymbolSpace in interface ComponentReference

isEmptiable

public boolean isEmptiable()
                    throws UnresolvedReferenceException

Determine if empty content is allowed

Specified by:

isEmptiable in interface Particle

Throws:

UnresolvedReferenceException

fixup

public boolean fixup(SchemaCompiler compiler)
              throws SchemaException

Fix up references to other elements in the schema.

Specified by:

fixup in interface UserSchemaComponent

Parameters:

compiler -

Returns:

true

Throws:

SchemaException

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 -

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

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

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.

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 interface Particle

Parameters:

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

getElementParticleCardinality

public int getElementParticleCardinality(int fingerprint)
                                  throws SchemaException,
                                         ValidationException

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 zero.

Specified by:

getElementParticleCardinality in interface Particle

Parameters:

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

Throws:

SchemaException

ValidationException

gatherAllPermittedElements

public void gatherAllPermittedElements(IntHashSet result)
                                throws SchemaException,
                                       ValidationException

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 interface Particle

Parameters:

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

Throws:

SchemaException

ValidationException

validate

public boolean validate(SchemaCompiler compiler)
                 throws SchemaException,
                        ValidationException

Checks the validity of this Schema definition.

Specified by:

validate in interface UserSchemaComponent

Returns:

true when this Schema definition is valid, otherwise false.

Throws:

SchemaException

ValidationException

compile

public void compile(SchemaCompiler compiler)
             throws SchemaException,
                    ValidationException

Compile a particle

Specified by:

compile in interface Particle

Parameters:

compiler -

Throws:

SchemaException

ValidationException

getTerm

public Term getTerm()

Get the term corresponding to this particle

Specified by:

getTerm in interface Particle

Specified by:

getTerm in class AbstractParticle

Returns:

the corresponding term

serialize

public void serialize(SchemaSerializer serializer)
               throws IOException

Serialize the schema component

Specified by:

serialize in interface SerializableSchemaComponent

Throws:

IOException

getComponentTypeCode

public int getComponentTypeCode()

Get a unique number identifying the type of component

Specified by:

getComponentTypeCode in interface SerializableSchemaComponent