prefuse.data.expression
Class ColumnExpression

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

All Implemented Interfaces:

java.util.EventListener, ExpressionListener, Expression, Predicate

Direct Known Subclasses:

HoverPredicate, StartVisiblePredicate, ValidatedPredicate, VisiblePredicate

public class ColumnExpression
extends AbstractExpression
implements Predicate

Expression instance that returns the value stored in a Tuple data field.

Author:

jeffrey heer

Field Summary

protected java.lang.String

m_field

Constructor Summary

ColumnExpression(java.lang.String field)
Create a new ColumnExpression.

Method Summary

java.lang.Object	get(Tuple t) By default, throws an UnsupportedOperationException.
boolean	getBoolean(Tuple t) By default, throws an UnsupportedOperationException.
java.lang.String	getColumnName() Get the column / data field name used by this expression.
double	getDouble(Tuple t) By default, throws an UnsupportedOperationException.
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.
java.lang.Class	getType(Schema s) Returns the type that this expression evaluates to when tuples with the given Schema are provided as input.
java.lang.String	toString()

Methods inherited from class prefuse.data.expression.AbstractExpression

addChildListeners, addExpressionListener, expressionChanged, fireExpressionChange, hasListeners, removeChildListeners, removeExpressionListener, visit

Methods inherited from class java.lang.Object

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

Methods inherited from interface prefuse.data.expression.Expression

addExpressionListener, removeExpressionListener, visit

Field Detail

m_field

protected final java.lang.String m_field

Constructor Detail

ColumnExpression

public ColumnExpression(java.lang.String field)

Create a new ColumnExpression.

Parameters:

field - the column / data field name to use

Method Detail

getColumnName

public java.lang.String getColumnName()

Get the column / data field name used by this expression.

Returns:

the column / data field name

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.

Specified by:

getType in interface Expression

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)

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)

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)

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)

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)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()