com.saxonica.schema

Class Assertion

java.lang.Object

com.saxonica.schema.SchemaStructure

com.saxonica.schema.Assertion

All Implemented Interfaces:

SerializableSchemaComponent, Serializable, SourceLocator, SchemaComponent

public class Assertion
extends SchemaStructure
implements SchemaComponent, SerializableSchemaComponent

An Assertion schema component (See XML Schema 1.1 Part 1 Working Draft)

See Also:

Serialized Form

Field Summary

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

COMPONENT_FUNCTION_TYPE, FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING

Constructor Summary

Constructors

Constructor and Description
Assertion(EnterpriseConfiguration config, XPathExpression condition, XPathVariable valueVariable, Map<StructuredQName,XPathVariable> params, String text) Create an Assertion component

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object other) equals() is used when deciding whether two assertions are equal, as part of the type subsumption algorithm.
FunctionItem	getComponentAsFunction() Get the schema component in the form of a function item.
XPathExpression	getCondition() Get the XPath expression representing the assertion.
String	getConditionText() Get the original text of the condition.
String	getMessage() Get the user-defined error message associated with the assertion
XPathStaticContext	getStaticContext() Get the static context for the expression
XPathVariable	getValueVariable() Get the variable bound to the name $value
int	hashCode() Hashcode is used when deciding whether two assertions are equal, as part of the type subsumption algorithm.
void	serialize(SchemaModelSerializer serializer) Serialize the schema component
void	setMessage(String message) Set the user-defined error message associated with the assertion
void	setStaticContext(XPathStaticContext staticContext) Set the static context for the expression.
List<Item>	test(Item contextItem, Sequence value, ConversionRules rules) Evaluate the assertion

Methods inherited from class com.saxonica.schema.SchemaStructure

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

Methods inherited from class java.lang.Object

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

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

getRedefinitionLevel, getValidationStatus

Constructor Detail

Assertion

public Assertion(EnterpriseConfiguration config,
         XPathExpression condition,
         XPathVariable valueVariable,
         Map<StructuredQName,XPathVariable> params,
         String text)

Create an Assertion component

Parameters:

config - the Saxon configuration

condition - the compiled XPath expression

valueVariable - the variable to hold $value (may be null)

params - parameters declared using saxon:param and used in this expression

text - the original text of the XPath expression

Method Detail

getCondition

public XPathExpression getCondition()

Get the XPath expression representing the assertion. If xs:report is used, this will be the negation of the condition in the source schema.

Returns:

the XPath expression

getValueVariable

public XPathVariable getValueVariable()

Get the variable bound to the name $value

Returns:

the variable whose name is $value (may be null)

getConditionText

public String getConditionText()

Get the original text of the condition.

Returns:

the original text of the XPath expression

setMessage

public void setMessage(String message)

Set the user-defined error message associated with the assertion

Parameters:

message - the message defined using the saxon:message attribute, if present

getMessage

public String getMessage()

Get the user-defined error message associated with the assertion

Returns:

the user-defined error message, if any; otherwise null

setStaticContext

public void setStaticContext(XPathStaticContext staticContext)

Set the static context for the expression. Note: this is needed only to support exporting of the schema component model

Parameters:

staticContext - the static context

getStaticContext

public XPathStaticContext getStaticContext()

Get the static context for the expression

Returns:

the static context

test

public List<Item> test(Item contextItem,
              Sequence value,
              ConversionRules rules)

Evaluate the assertion

Parameters:

contextItem - the item to be used as the context item in evaluating the condition

value - the simple value to be tested, if any. If present, and if the expression uses $value, this value will be bound to the variable $value for evaluating the assertion.

rules - used to provide context information including the current error listener, URIResolver, and document pool, current date/time, etc. To take advantage of validation parameters (saxon:param) this must be a ValidationContext; but on other paths such as casting it is not possible to supply parameters, and the defaults are used

Returns:

null if the assertion succeeds; otherwise a list of offending items which will be reported in any error message. Returning an empty list indicates that the assertion has failed but there are no specific offending items to be reported.

hashCode

public int hashCode()

Hashcode is used when deciding whether two assertions are equal, as part of the type subsumption algorithm. Assertions are equal if their XPath expressions are equal.

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

equals() is used when deciding whether two assertions are equal, as part of the type subsumption algorithm. Assertions are equal if their XPath expressions are equal.

Overrides:

equals in class Object

serialize

public void serialize(SchemaModelSerializer serializer)
               throws XPathException

Serialize the schema component

Specified by:

serialize in interface SerializableSchemaComponent

Parameters:

serializer - the object responsible for performing the serialization

Throws:

XPathException - if serialization fails

getComponentAsFunction

public FunctionItem getComponentAsFunction()

Description copied from interface: SchemaComponent

Get the schema component in the form of a function item. This allows schema information to be made visible to XSLT or XQuery code. The function makes available the contents of the schema component as defined in the XSD specification. The function takes a string as argument representing a property name, and returns the corresponding property of the schema component. There is also a property "class" which returns the kind of schema component, for example "Attribute Declaration".

Specified by:

getComponentAsFunction in interface SchemaComponent

Returns:

the schema component represented as a function from property names to property values.