prefuse.data.expression
Class IfExpression

java.lang.Object
  prefuse.data.expression.AbstractExpression
      prefuse.data.expression.IfExpression

All Implemented Interfaces:

java.util.EventListener, ExpressionListener, Expression

public class IfExpression
extends AbstractExpression

Expression instance representing an "if then else" clause in the prefuse expression language.

Author:

jeffrey heer

Constructor Summary

IfExpression(Predicate test, Expression thenExpr, Expression elseExpr)
Create a new IfExpression.

Method Summary

protected void	addChildListeners() Add child listeners to catch and propagate sub-expression updates.
java.lang.Object	get(Tuple t) By default, throws an UnsupportedOperationException.
boolean	getBoolean(Tuple t) By default, throws an UnsupportedOperationException.
double	getDouble(Tuple t) By default, throws an UnsupportedOperationException.
Expression	getElseExpression() Get the else expression
float	getFloat(Tuple t) By default, throws an UnsupportedOperationException.
int	getInt(Tuple t) By default, throws an UnsupportedOperationException.
long	getLong(Tuple t) By default, throws an UnsupportedOperationException.
Predicate	getTestPredicate() Get the test predicate.
Expression	getThenExpression() Get the then expression
java.lang.Class	getType(Schema s) Returns the type that this expression evaluates to when tuples with the given Schema are provided as input.
protected void	removeChildListeners() Remove child listeners for sub-expression updates.
void	setElseExpression(Expression e) Set the else expression
void	setTestPredicate(Predicate p) Set the test predicate.
void	setThenExpression(Expression e) Set the then expression
java.lang.String	toString()
void	visit(ExpressionVisitor v) Passes the visitor through this expression and any sub expressions

Methods inherited from class prefuse.data.expression.AbstractExpression

addExpressionListener, expressionChanged, fireExpressionChange, hasListeners, removeExpressionListener

Methods inherited from class java.lang.Object

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

Constructor Detail

IfExpression

public IfExpression(Predicate test,
                    Expression thenExpr,
                    Expression elseExpr)

Create a new IfExpression.

Parameters:

test - the predicate test for the if statement

thenExpr - the expression to evaluate if the test predicate evaluates to true

elseExpr - the expression to evaluate if the test predicate evaluates to false

Method Detail

getTestPredicate

public Predicate getTestPredicate()

Get the test predicate.

Returns:

the test predicate

getThenExpression

public Expression getThenExpression()

Get the then expression

Returns:

the then expression

getElseExpression

public Expression getElseExpression()

Get the else expression

Returns:

the else expression

setTestPredicate

public void setTestPredicate(Predicate p)

Set the test predicate.

Parameters:

p - the test predicate

setThenExpression

public void setThenExpression(Expression e)

Set the then expression

Parameters:

e - the then expression to set

setElseExpression

public void setElseExpression(Expression e)

Set the else expression

Parameters:

e - the else expression to set

getType

public java.lang.Class getType(Schema s)

Description copied from interface: Expression

Returns the type that this expression evaluates to when tuples with the given Schema are provided as input.

See Also:

Expression.getType(prefuse.data.Schema)

get

public java.lang.Object get(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

get in interface Expression

Overrides:

get in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as an Object

See Also:

Expression.get(prefuse.data.Tuple)

getBoolean

public boolean getBoolean(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

getBoolean in interface Expression

Overrides:

getBoolean in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as a boolean

See Also:

Expression.getBoolean(prefuse.data.Tuple)

getDouble

public double getDouble(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

getDouble in interface Expression

Overrides:

getDouble in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as a double

See Also:

Expression.getDouble(prefuse.data.Tuple)

getFloat

public float getFloat(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

getFloat in interface Expression

Overrides:

getFloat in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as a float

See Also:

Expression.getFloat(prefuse.data.Tuple)

getInt

public int getInt(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

getInt in interface Expression

Overrides:

getInt in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as an int

See Also:

Expression.getInt(prefuse.data.Tuple)

getLong

public long getLong(Tuple t)

Description copied from class: AbstractExpression

By default, throws an UnsupportedOperationException.

Specified by:

getLong in interface Expression

Overrides:

getLong in class AbstractExpression

Parameters:

t - the input Tuple

Returns:

the Expression return value, as a long

See Also:

Expression.getLong(prefuse.data.Tuple)

visit

public void visit(ExpressionVisitor v)

Description copied from interface: Expression

Passes the visitor through this expression and any sub expressions

Specified by:

visit in interface Expression

Overrides:

visit in class AbstractExpression

Parameters:

v - the ExpressionVisitor

See Also:

Expression.visit(prefuse.data.expression.ExpressionVisitor)

addChildListeners

protected void addChildListeners()

Description copied from class: AbstractExpression

Add child listeners to catch and propagate sub-expression updates.

Overrides:

addChildListeners in class AbstractExpression

See Also:

AbstractExpression.addChildListeners()

removeChildListeners

protected void removeChildListeners()

Description copied from class: AbstractExpression

Remove child listeners for sub-expression updates.

Overrides:

removeChildListeners in class AbstractExpression

See Also:

AbstractExpression.removeChildListeners()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()