org.apache.jena.arq.querybuilder.handlers

Class SelectHandler

java.lang.Object

org.apache.jena.arq.querybuilder.handlers.SelectHandler

All Implemented Interfaces:

Handler

public class SelectHandler
extends Object
implements Handler

A Select clause handler.

Constructor Summary

Constructors

Constructor and Description
SelectHandler(AggregationHandler aggHandler) Constructor.

Method Summary

Modifier and Type	Method and Description
void	addAll(SelectHandler selectHandler) Add all the variables from the select handler variable.
void	addVar(Expr expr, Var var) Add an Expression as variable to the select.
void	addVar(String expression, Var var) Add an Expression as variable to the select.
void	addVar(Var var) Add a variable to the select.
void	build() Called by the build process for this handler to perform any adjustments to the query before the build completes.
VarExprList	getProject() Return the projected var expression list.
List<Var>	getVars() Get the list of variables from the query.
void	setDistinct(boolean state) Set the distinct flag.
void	setReduced(boolean state) Set the reduced flag.
void	setVars(Map<Var,Node> values) Set the values for variables managed by the handler implementation.

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectHandler

public SelectHandler(AggregationHandler aggHandler)

Constructor.

Parameters:

aggHandler - The aggregate handler that wraps the query we want to handle.

Method Detail

setDistinct

public void setDistinct(boolean state)

Set the distinct flag. Set or unset the distinct flag. Will set the reduced flag if it was previously set.

Parameters:

state - the state to set the distinct flag to.

setReduced

public void setReduced(boolean state)

Set the reduced flag. Set or unset the reduced flag. Will set the reduced flag if it was previously set.

Parameters:

state - the state to set the reduced flag to.

addVar

public void addVar(Var var)

Add a variable to the select. If the variable is null the variables are set to star.

Parameters:

var - The variable to add.

addVar

public void addVar(String expression,
                   Var var)

Add an Expression as variable to the select. If the variable is the variables are set to star.

Parameters:

expression - The expression as a string.

var - The variable to add.

addVar

public void addVar(Expr expr,
                   Var var)

Add an Expression as variable to the select.

Parameters:

expr - The expression to add.

var - The variable to add.

getVars

public List<Var> getVars()

Get the list of variables from the query.

Returns:

The list of variables in the query.

getProject

public VarExprList getProject()

Return the projected var expression list.

Returns:

The projected var expression list.

addAll

public void addAll(SelectHandler selectHandler)

Add all the variables from the select handler variable.

Parameters:

selectHandler - The select handler to copy the variables from.

setVars

public void setVars(Map<Var,Node> values)

Description copied from interface: Handler

Set the values for variables managed by the handler implementation. This method is called by the builder to set values handled by this Handler implementation.

Specified by:

setVars in interface Handler

Parameters:

values - The map of variable to node value.

build

public void build()

Description copied from interface: Handler

Called by the build process for this handler to perform any adjustments to the query before the build completes. The adjustments are made after setVars() has been called.

Specified by:

build in interface Handler