prefuse.visual.expression
Class QueryExpression

java.lang.Object
  prefuse.data.expression.AbstractExpression
      prefuse.visual.expression.GroupExpression
          prefuse.visual.expression.QueryExpression

All Implemented Interfaces:

java.util.EventListener, ExpressionListener, Expression, Function

public class QueryExpression
extends GroupExpression

Expression that returns the current query string of a data group of the type SearchTupleSet. The data group name is provided by a String-valued sub-expression.

Author:

jeffrey heer

Field Summary

Fields inherited from class prefuse.visual.expression.GroupExpression

m_group

Fields inherited from interface prefuse.data.expression.Function

VARARGS

Constructor Summary

QueryExpression()
Create a new QueryExpression.

QueryExpression(java.lang.String group)
Create a new QueryExpression.

Method Summary

java.lang.Object	get(Tuple t) By default, throws an UnsupportedOperationException.
java.lang.String	getName() Get the name of this function.
java.lang.Class	getType(Schema s) Returns the type that this expression evaluates to when tuples with the given Schema are provided as input.

Methods inherited from class prefuse.visual.expression.GroupExpression

addParameter, getGroup, getParameterCount, toString

Methods inherited from class prefuse.data.expression.AbstractExpression

addChildListeners, addExpressionListener, expressionChanged, fireExpressionChange, getBoolean, getDouble, getFloat, getInt, getLong, 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, getBoolean, getDouble, getFloat, getInt, getLong, removeExpressionListener, visit

Constructor Detail

QueryExpression

public QueryExpression()

Create a new QueryExpression.

QueryExpression

public QueryExpression(java.lang.String group)

Create a new QueryExpression.

Parameters:

group - @param group the data group name to use as a parameter

Method Detail

getName

public java.lang.String getName()

Description copied from interface: Function

Get the name of this function.

Returns:

the function name

See Also:

Function.getName()

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)