prefuse.data.expression
Class ComparisonPredicate

java.lang.Object
  prefuse.data.expression.AbstractExpression
      prefuse.data.expression.BinaryExpression
          prefuse.data.expression.ComparisonPredicate

All Implemented Interfaces:

java.util.EventListener, Expression, ExpressionListener, Predicate

public class ComparisonPredicate

extends BinaryExpression

implements Predicate

Predicate implementation that computes a comparison operation. Supported operations are equals, not equals, less than, greater than, less than or equal to, and greater than or equal to.

Author:

jeffrey heer

Field Summary

static int	EQ Indicates a equals comparison.
static int	GT Indicates a greater-than comparison.
static int	GTEQ Indicates a greater-than-or-equals comparison.
static int	LT Indicates a less-than comparison.
static int	LTEQ Indicates a less-than-or-equals comparison.
static int	NEQ Indicates a not-equals comparison.

Fields inherited from class prefuse.data.expression.BinaryExpression

m_left, m_op, m_right

Constructor Summary

ComparisonPredicate(int operation, Expression left, Expression right)
Create a new ComparisonPredicate.

ComparisonPredicate(int operation, Expression left, Expression right, java.util.Comparator cmp)
Create a new ComparisonPredicate.

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.util.Comparator	getComparator() Get the comparator used to compare instances.
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.BinaryExpression

addChildListeners, getLeftExpression, getOperation, getRightExpression, removeChildListeners, setLeftExpression, setRightExpression, visit

Methods inherited from class prefuse.data.expression.AbstractExpression

addExpressionListener, expressionChanged, fireExpressionChange, getDouble, getFloat, getInt, getLong, hasListeners, removeExpressionListener

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, getDouble, getFloat, getInt, getLong, removeExpressionListener, visit

Field Detail

LT

public static final int LT

Indicates a less-than comparison.

See Also:

Constant Field Values

GT

public static final int GT

Indicates a greater-than comparison.

See Also:

Constant Field Values

EQ

public static final int EQ

Indicates a equals comparison.

See Also:

Constant Field Values

NEQ

public static final int NEQ

Indicates a not-equals comparison.

See Also:

Constant Field Values

LTEQ

public static final int LTEQ

Indicates a less-than-or-equals comparison.

See Also:

Constant Field Values

GTEQ

public static final int GTEQ

Indicates a greater-than-or-equals comparison.

See Also:

Constant Field Values

Constructor Detail

ComparisonPredicate

public ComparisonPredicate(int operation,
                           Expression left,
                           Expression right)

Create a new ComparisonPredicate. Uses a default comparator instance.

Parameters:

operation - the comparison operation to compute

left - the left sub-expression

right - the right sub-expression

ComparisonPredicate

public ComparisonPredicate(int operation,
                           Expression left,
                           Expression right,
                           java.util.Comparator cmp)

Create a new ComparisonPredicate.

Parameters:

operation - the comparison operation to compute

left - the left sub-expression

right - the right sub-expression

cmp - the comparator to use to compare values

Method Detail

getComparator

public java.util.Comparator getComparator()

Get the comparator used to compare instances.

Returns:

the comparator instance

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)

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)

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)

toString

public java.lang.String toString()

See Also:

Object.toString()