net.sf.saxon.expr.instruct
Class LocationMap

java.lang.Object
  net.sf.saxon.expr.instruct.LocationMap

All Implemented Interfaces:

Serializable, LocationProvider

public class LocationMap
extends Object
implements LocationProvider, Serializable

A LocationMap allocates integer codes to (systemId, lineNumber) pairs. The integer codes are held inside an Expression object to track the location of the expression in the source code

See Also:

Serialized Form

Constructor Summary

LocationMap()
Create a location map

Method Summary

int	allocateLocationId(String module, int lineNumber) Allocate a location identifier to an expression
int	getColumnNumber(long locationId) Get the column number within the document, entity, or module containing a particular location
int	getLineNumber(long locationId) Get the line number corresponding to a locationId
String	getSystemId(long locationId) Get the system identifier corresponding to a locationId

Methods inherited from class java.lang.Object

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

Constructor Detail

LocationMap

public LocationMap()

Create a location map

Method Detail

allocateLocationId

public int allocateLocationId(String module,
                              int lineNumber)

Allocate a location identifier to an expression

Parameters:

module - the URI (system identifier) of the module

lineNumber - the line number of the expression within the module

Returns:

the corresponding location identifier

getSystemId

public String getSystemId(long locationId)

Get the system identifier corresponding to a locationId

Specified by:

getSystemId in interface LocationProvider

Parameters:

locationId - the location identifier

Returns:

the corresponding system identifier

getLineNumber

public int getLineNumber(long locationId)

Get the line number corresponding to a locationId

Specified by:

getLineNumber in interface LocationProvider

Parameters:

locationId - the location identifier

Returns:

the corresponding line number

getColumnNumber

public int getColumnNumber(long locationId)

Description copied from interface: LocationProvider

Get the column number within the document, entity, or module containing a particular location

Specified by:

getColumnNumber in interface LocationProvider

Parameters:

locationId - identifier of the location in question (as passed down the Receiver pipeline)

Returns:

the column number within the document, entity, or module, or -1 if this is not available