prefuse.data.expression
Class ColumnExpression

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

All Implemented Interfaces:

java.util.EventListener, Expression, ExpressionListener, 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) Evaluate the Expression on the given input Tuple.
boolean	getBoolean(Tuple t) Evaluate the Expression on the given input Tuple.
java.lang.String	getColumnName() Get the column / data field name used by this expression.
double	getDouble(Tuple t) Evaluate the Expression on the given input Tuple.
float	getFloat(Tuple t) Evaluate the Expression on the given input Tuple.
int	getInt(Tuple t) Evaluate the Expression on the given input Tuple.
long	getLong(Tuple t) Evaluate the Expression on the given input Tuple.
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 interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

get in interface Expression

Overrides:

get in class AbstractExpression

See Also:

Expression.get(prefuse.data.Tuple)

getInt

public int getInt(Tuple t)

Description copied from interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

getInt in interface Expression

Overrides:

getInt in class AbstractExpression

See Also:

Expression.getInt(prefuse.data.Tuple)

getLong

public long getLong(Tuple t)

Description copied from interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

getLong in interface Expression

Overrides:

getLong in class AbstractExpression

See Also:

Expression.getLong(prefuse.data.Tuple)

getFloat

public float getFloat(Tuple t)

Description copied from interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

getFloat in interface Expression

Overrides:

getFloat in class AbstractExpression

See Also:

Expression.getFloat(prefuse.data.Tuple)

getDouble

public double getDouble(Tuple t)

Description copied from interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

getDouble in interface Expression

Overrides:

getDouble in class AbstractExpression

See Also:

Expression.getDouble(prefuse.data.Tuple)

getBoolean

public boolean getBoolean(Tuple t)

Description copied from interface: Expression

Evaluate the Expression on the given input Tuple.

Specified by:

getBoolean in interface Expression

Overrides:

getBoolean in class AbstractExpression

See Also:

Expression.getBoolean(prefuse.data.Tuple)

toString

public java.lang.String toString()

See Also:

Object.toString()