prefuse.data.expression
Class BinaryExpression

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

All Implemented Interfaces:

java.util.EventListener, ExpressionListener, Expression

Direct Known Subclasses:

ArithmeticExpression, ComparisonPredicate, RangePredicate

public abstract class BinaryExpression
extends AbstractExpression

Abstract base class for Expression implementations that maintain two sub-expressions. These are referred to as the left expression (the first one) and the right expression (the second one).

Author:

jeffrey heer

Field Summary

protected Expression	m_left
protected int	m_op
protected Expression	m_right

Constructor Summary

protected

BinaryExpression(int operation, int minOp, int maxOp, Expression left, Expression right) Create a new BinaryExpression.

Method Summary

protected void	addChildListeners() Add child listeners to catch and propagate sub-expression updates.
Expression	getLeftExpression() Get the left sub-expression.
int	getOperation() Get the operation code for this expression.
Expression	getRightExpression() Get the right sub-expression.
protected void	removeChildListeners() Remove child listeners for sub-expression updates.
void	setLeftExpression(Expression e) Set the left sub-expression.
void	setRightExpression(Expression e) Set the right sub-expression.
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, get, getBoolean, getDouble, getFloat, getInt, getLong, hasListeners, removeExpressionListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface prefuse.data.expression.Expression

getType

Field Detail

m_op

protected int m_op

m_left

protected Expression m_left

m_right

protected Expression m_right

Constructor Detail

BinaryExpression

protected BinaryExpression(int operation,
                           int minOp,
                           int maxOp,
                           Expression left,
                           Expression right)

Create a new BinaryExpression.

Parameters:

operation - int value indicating the operation to be performed on the subtrees. The actual range of acceptable values are determined by subclasses.

minOp - the minimum legal operation code value

maxOp - the maximum legal operation code value

left - the left sub-expression

right - the right sub-expression

Method Detail

getLeftExpression

public Expression getLeftExpression()

Get the left sub-expression.

Returns:

the left sub-expression

getRightExpression

public Expression getRightExpression()

Get the right sub-expression.

Returns:

the right sub-expression

setLeftExpression

public void setLeftExpression(Expression e)

Set the left sub-expression. Any listeners will be notified.

Parameters:

e - the left sub-expression to use

setRightExpression

public void setRightExpression(Expression e)

Set the right sub-expression. Any listeners will be notified.

Parameters:

e - the right sub-expression to use

getOperation

public int getOperation()

Get the operation code for this expression. The meaning of this code is left for subclasses to determine.

Returns:

the operation code

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()