com.saxonica.schema
Class AttributeUse

java.lang.Object
  com.saxonica.schema.SchemaStructure
      com.saxonica.schema.SimpleComponentReference
          com.saxonica.schema.AttributeUse

All Implemented Interfaces:

ComponentReference, UserSchemaComponent, Serializable, SourceLocator, SchemaComponent

public final class AttributeUse
extends SimpleComponentReference
implements UserSchemaComponent

An XML Schema Attribute Use: that is, a reference to an attribute declaration from within a complex type or attribute group.

This corresponds to an xs:attribute ref="" element in the XML representation of the schema.

Technically, a local attribute declaration (a non global xs:attribute name="") should be represented by two schema components, an attribute use and an attribute declaration. We don't currently do this, instead the containing attribute group refers to the attribute declaration directly.

See Also:

Serialized Form

Field Summary

static short	OPTIONAL Value representing use="optional"
static short	PROHIBITED Value representing use="prohibited"
static short	REQUIRED Value representing use="required"

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

FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING

Constructor Summary

AttributeUse(SchemaAwareConfiguration config)
Creates a new Attribute Use in the given schema.

Method Summary

boolean	fixup(SchemaCompiler compiler) Fix up references to other elements in the schema.
AttributeDecl	getAttributeDeclaration() Get the corresponding attribute declaration
String	getDefaultValue() Returns the default value of this attribute use.
String	getDisplayName() Returns the name of the attribute defined by this AttributeDecl.
Value	getFixedValue() Returns the fixed value of this attribute use.
String	getUnderlyingDefaultValue() Get the default value of this attribute use if there is one; if there is none, get the default value of the corresponding attribute declaration; if the declaration defines no default value, return null
Value	getUnderlyingFixedValue() Returns the fixed value of this attribute use, or of the corresponding attribute declaration if the attribute use has no fixed value.
String	getUse() Get the value of the 'use' attribute for this attribute declaration or attribute reference.
boolean	isOptional() Returns true if the use attribute is equal to "optional".
boolean	isProhibited() Returns true if the use attribute is equal to "prohibited".
boolean	isRequired() Returns true if the 'use' attribute is equal to REQUIRED and there is no specified value.
void	serialize(SchemaModelSerializer serializer) Serialize the schema component
void	setDefaultValue(String value) Sets the default value.
void	setFixedValue(Value value) Sets the fixed value.
void	setNamespaceResolver(NamespaceResolver resolver) Set the namespace resolver for resolving QName-valued fixed and default values
void	setUse(short value) Sets the 'use' attribute of this attribute declaration.
boolean	testFixedValue(CharSequence value, NamespaceResolver resolver) Test a value against the fixed value.
boolean	validate(SchemaCompiler compiler) Checks the validity of this Attribute Use

Methods inherited from class com.saxonica.schema.SimpleComponentReference

getFingerprint, getNameCode, getSymbolSpace, getTarget, isResolved, setNameCode, setTarget, tryToResolve

Methods inherited from class com.saxonica.schema.SchemaStructure

elaborate, getColumnNumber, getConfiguration, getFixupStatus, getLineNumber, getPublicId, getSystemId, getValidationStatus, lookForCycles, 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.UserSchemaComponent

elaborate, lookForCycles

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

getValidationStatus

Methods inherited from interface com.saxonica.schema.ComponentReference

getConfiguration

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Field Detail

OPTIONAL

public static final short OPTIONAL

Value representing use="optional"

See Also:

Constant Field Values

PROHIBITED

public static final short PROHIBITED

Value representing use="prohibited"

See Also:

Constant Field Values

REQUIRED

public static final short REQUIRED

Value representing use="required"

See Also:

Constant Field Values

Constructor Detail

AttributeUse

public AttributeUse(SchemaAwareConfiguration config)

Creates a new Attribute Use in the given schema. For system use only.

Parameters:

config - the Configuration that contains the new attributeUse

Method Detail

getAttributeDeclaration

public AttributeDecl getAttributeDeclaration()
                                      throws UnresolvedReferenceException

Get the corresponding attribute declaration

Returns:

the attribute declaration referenced by this attribute use

Throws:

UnresolvedReferenceException

getDisplayName

public String getDisplayName()

Returns the name of the attribute defined by this AttributeDecl. This is used only for diagnostic display purposes

Returns:

the name of the attribute as a lexical QName.

getUse

public String getUse()

Get the value of the 'use' attribute for this attribute declaration or attribute reference. If this is a reference the value of the use attribute will *not* be obtained from the referenced attribute declaration as top-level attributes do not take into account the use attribute.

Returns:

the value of the 'use' attribute for this attribute declaration, as a string: "prohibited", "required", or "optional".

getDefaultValue

public String getDefaultValue()

Returns the default value of this attribute use.

Returns:

the default value defined by this attribute declaration, or null if no default was specified.

getUnderlyingDefaultValue

public String getUnderlyingDefaultValue()

Get the default value of this attribute use if there is one; if there is none, get the default value of the corresponding attribute declaration; if the declaration defines no default value, return null

Returns:

the default attribute value if there is one, otherwise null

getFixedValue

public Value getFixedValue()

Returns the fixed value of this attribute use.

Returns:

the fixed value defined by this attribute use, or null if no fixed value was specified. Once the schema has been compiled this will be the correctly-typed value; until then it will be the string value as specified in the source schema.

getUnderlyingFixedValue

public Value getUnderlyingFixedValue()

Returns the fixed value of this attribute use, or of the corresponding attribute declaration if the attribute use has no fixed value.

Returns:

the fixed value defined by this attribute use, if one was specified; failing that, the fixed value defined for the corresponding attribute declaration; failing that, null. Once the schema has been compiled this will be the correctly-typed value; until then it will be the string value as specified in the source schema.

setNamespaceResolver

public void setNamespaceResolver(NamespaceResolver resolver)

Set the namespace resolver for resolving QName-valued fixed and default values

Parameters:

resolver - the namespace resolver to be used

testFixedValue

public boolean testFixedValue(CharSequence value,
                              NamespaceResolver resolver)
                       throws ValidationException

Test a value against the fixed value. This tests both against the fixed value for this attribute use, and the fixed value of the corresponding attribute declaration (which must be equivalent if they are both present).

Parameters:

value - the value to be tested

resolver - the namespace resolver to be used if the value is namespace sensitive

Returns:

true if it matches (or if there is no fixed value), false otherwise

Throws:

ValidationException - if the value is not valid for this type

isOptional

public boolean isOptional()

Returns true if the use attribute is equal to "optional".

Returns:

true if the use attribute is equal to "optional".

isProhibited

public boolean isProhibited()

Returns true if the use attribute is equal to "prohibited". Note that in the W3C schema component model, no attribute use ever has the value "prohibited": this should be treated as if the attribute use did not exist.

Returns:

true if the use attribute is equal to "prohibited".

isRequired

public boolean isRequired()

Returns true if the 'use' attribute is equal to REQUIRED and there is no specified value. If a value is specified and the 'use' attribute is "required" then required is will return false, because the attribute value automatically becomes fixed.

Returns:

true if the use attribute is equal to "required" and no default value has been specified, otherwise false

setUse

public void setUse(short value)

Sets the 'use' attribute of this attribute declaration. For internal use only.

Parameters:

value - one of the following: ("prohibited" | "optional" | "required")

setDefaultValue

public void setDefaultValue(String value)

Sets the default value. For internal use only.

Parameters:

value - the default value

setFixedValue

public void setFixedValue(Value value)

Sets the fixed value. For internal use only.

Parameters:

value - the fixed value

fixup

public boolean fixup(SchemaCompiler compiler)
              throws SchemaException

Fix up references to other elements in the schema. This implementation does nothing

Specified by:

fixup in interface UserSchemaComponent

Overrides:

fixup in class SchemaStructure

Parameters:

compiler - the schema compiler, used for error reporting

Returns:

true if successful.

Throws:

SchemaException

validate

public boolean validate(SchemaCompiler compiler)
                 throws SchemaException

Checks the validity of this Attribute Use

Specified by:

validate in interface UserSchemaComponent

Returns:

true when this Schema definition is valid, otherwise false.

Throws:

SchemaException - if the error listener decides an error is fatal

serialize

public void serialize(SchemaModelSerializer serializer)
               throws XPathException

Serialize the schema component

Parameters:

serializer - the schema serializer

Throws:

XPathException