uk.ac.ic.doc.rodex.qproc
Class QueryVariable

java.lang.Object
  uk.ac.ic.doc.rodex.qproc.QueryVariable

public class QueryVariable
extends java.lang.Object

Constructor Summary

QueryVariable(java.lang.String varName)
Creates a new instance of QueryVariable

Method Summary

void	addBoundField(java.lang.String boundField) Add variable to which this head var is bound to
void	addBoundFunction(QueryFunction qf) Add a reference to a QueryFunction object that uses this variable
void	addSubGoal(QuerySubGoal subGoal) Add a new sub goal object that uses this shared variable
boolean	equals(java.lang.Object var) Compare string-representation of two query variable objects
java.util.List	getBoundFields() Getter for bounded fields
java.util.List	getBoundFunctions() Getter for bound functions
java.lang.String	getName()
java.util.List	getSubGoals() Return a list of QuerySubGoal objects which refer to this variable
boolean	isConsistentWith(QueryVariable var) Two QueryVariable objects are consistent if their bound functions (if any) are mutually consistent.
boolean	isConstant() Test if this variable is also a query constant, i.e.
boolean	isMappableTo(QueryVariable var) Two QueryVariable objects are mappable if they are bound to the same field in a query scheme (e.g.
boolean	isShared() Test to see if this is a shared variable, i.e.
java.lang.String	toString() Return a String representation of the query variable

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryVariable

public QueryVariable(java.lang.String varName)

Creates a new instance of QueryVariable

Method Detail

addSubGoal

public void addSubGoal(QuerySubGoal subGoal)

Add a new sub goal object that uses this shared variable

Parameters:

subGoal - a reference to a QuerySubGoal object

addBoundFunction

public void addBoundFunction(QueryFunction qf)

Add a reference to a QueryFunction object that uses this variable

isShared

public boolean isShared()

Test to see if this is a shared variable, i.e. is linked to more than one
sub-goals

Returns:

boolean true if this is a shared variable, false otherwise

isConstant

public boolean isConstant()

Test if this variable is also a query constant, i.e. it is associated to one equal (=) function

getSubGoals

public java.util.List getSubGoals()

Return a list of QuerySubGoal objects which refer to this variable

equals

public boolean equals(java.lang.Object var)

Compare string-representation of two query variable objects

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Return a String representation of the query variable

Overrides:

toString in class java.lang.Object

getName

public java.lang.String getName()

addBoundField

public void addBoundField(java.lang.String boundField)

Add variable to which this head var is bound to

getBoundFields

public java.util.List getBoundFields()

Getter for bounded fields

getBoundFunctions

public java.util.List getBoundFunctions()

Getter for bound functions

isConsistentWith

public boolean isConsistentWith(QueryVariable var)

Two QueryVariable objects are consistent if their bound functions (if any)
are mutually consistent.

Parameters:

var - another QueryVariable object

Returns:

boolean true of two objects are mappable, false otherwise

isMappableTo

public boolean isMappableTo(QueryVariable var)

Two QueryVariable objects are mappable if they are bound to the
same field in a query scheme (e.g. same database column)