net.sf.saxon.expr.instruct

Class ExpressionInfo

java.lang.Object

net.sf.saxon.expr.instruct.ExpressionInfo

All Implemented Interfaces:

SourceLocator, Location, InstructionInfo, Locator

public final class ExpressionInfo
extends Object
implements InstructionInfo

Details about an instruction, used when reporting errors and when tracing

Constructor Summary

Constructors

Constructor and Description
ExpressionInfo(Expression expr)

Method Summary

Methods

Modifier and Type	Method and Description
int	getColumnNumber() Get the column number identifying the position of the instruction.
int	getConstructType() Get the construct type
int	getLineNumber() Get the line number of the instruction within its module
StructuredQName	getObjectName() Get a name identifying the object of the expression, for example a function name, template name, variable name, key name, element name, etc.
Iterator<String>	getProperties() Get an iterator over all the properties available.
Object	getProperty(String name) Get the value of a particular property of the instruction.
String	getPublicId() Get the public ID of the module containing the instruction.
String	getSystemId() Get the URI of the module containing the instruction
Location	saveLocation() Get an immutable copy of this Location object.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionInfo

public ExpressionInfo(Expression expr)

Method Detail

getConstructType

public int getConstructType()

Get the construct type

Specified by:

getConstructType in interface InstructionInfo

Returns:

an integer identifying the kind of construct

getSystemId

public String getSystemId()

Get the URI of the module containing the instruction

Specified by:

getSystemId in interface SourceLocator

Specified by:

getSystemId in interface Location

Specified by:

getSystemId in interface Locator

Returns:

the module's URI, or null indicating unknown

getLineNumber

public int getLineNumber()

Get the line number of the instruction within its module

Specified by:

getLineNumber in interface SourceLocator

Specified by:

getLineNumber in interface Location

Specified by:

getLineNumber in interface Locator

Returns:

the line number

saveLocation

public Location saveLocation()

Get an immutable copy of this Location object. By default Location objects may be mutable, so they should not be saved for later use. The result of this operation holds the same location information, but in an immutable form.

Specified by:

saveLocation in interface Location

getObjectName

public StructuredQName getObjectName()

Get a name identifying the object of the expression, for example a function name, template name, variable name, key name, element name, etc. This is used only where the name is known statically.

Specified by:

getObjectName in interface InstructionInfo

Returns:

the name of the object, or null to indicate that it has no name

getProperty

public Object getProperty(String name)

Description copied from interface: InstructionInfo

Get the value of a particular property of the instruction. Properties of XSLT instructions are generally known by the name of the stylesheet attribute that defines them.

Specified by:

getProperty in interface InstructionInfo

Parameters:

name - The name of the required property

Returns:

The value of the requested property, or null if the property is not available

getProperties

public Iterator<String> getProperties()

Get an iterator over all the properties available. The values returned by the iterator will be of type String, and each string can be supplied as input to the getProperty() method to retrieve the value of the property.

Specified by:

getProperties in interface InstructionInfo

Returns:

an iterator over the names of the properties

getPublicId

public String getPublicId()

Get the public ID of the module containing the instruction. This method is provided to satisfy the SourceLocator interface. However, the public ID is not maintained by Saxon, and the method always returns null

Specified by:

getPublicId in interface SourceLocator

Specified by:

getPublicId in interface Location

Specified by:

getPublicId in interface Locator

Returns:

null

getColumnNumber

public int getColumnNumber()

Get the column number identifying the position of the instruction.

Specified by:

getColumnNumber in interface SourceLocator

Specified by:

getColumnNumber in interface Location

Specified by:

getColumnNumber in interface Locator

Returns:

-1 if column number is not known