freemarker.template.expression
Class AbstractBinary

java.lang.Object
  freemarker.template.expression.AbstractBinary

All Implemented Interfaces:

Binary, Expression, Operator, java.io.Serializable

Direct Known Subclasses:

And, Divide, Equals, GreaterThan, GreaterThanOrEquals, LessThan, LessThanOrEquals, Minus, Modulo, Multiply, NotEquals, Or, Plus

public abstract class AbstractBinary
extends java.lang.Object
implements Binary, java.io.Serializable

Abstract class that implements most of the surrounding machinery needed for binary expressions. This turns out to be identical for all binary operators, so is consolidated into this one abstract class.

Version:

$Id: AbstractBinary.java 1101 2013-04-01 04:17:32Z run2000 $

See Also:

Serialized Form

Field Summary

protected Expression	left The left-hand side of the expression to be evaluated.
protected Expression	right The right-hand side of the expression to be evaluated.

Constructor Summary

AbstractBinary()
Default constructor.

Method Summary

boolean	isComplete() Is the Expression complete?
Expression	resolveExpression() Resolves the current expression, possibly into a different expression object.
void	setLeft(Expression left) Sets the left-hand side of the expression.
void	setRight(Expression right) Sets the right-hand side of the expression.

Methods inherited from class java.lang.Object

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

Methods inherited from interface freemarker.template.expression.Operator

getPrecedence

Methods inherited from interface freemarker.template.expression.Expression

getAsTemplateModel, getType, isConstant

Field Detail

left

protected Expression left

The left-hand side of the expression to be evaluated.

right

protected Expression right

The right-hand side of the expression to be evaluated.

Constructor Detail

AbstractBinary

public AbstractBinary()

Default constructor.

Method Detail

setLeft

public void setLeft(Expression left)

Sets the left-hand side of the expression.

Specified by:

setLeft in interface Binary

Parameters:

left - the left-hand side of the expression

Throws:

java.lang.NullPointerException - the argument was null

setRight

public void setRight(Expression right)

Sets the right-hand side of the expression.

Specified by:

setRight in interface Binary

Parameters:

right - the right-hand side of the expression

Throws:

java.lang.NullPointerException - the argument was null

isComplete

public boolean isComplete()

Is the Expression complete?

Specified by:

isComplete in interface Expression

Returns:

true if both left and right sides of the expression are specified, otherwise false

resolveExpression

public Expression resolveExpression()
                             throws TemplateException

Resolves the current expression, possibly into a different expression object. Situations where this may be used are:

• Caching frequently-used expression objects
• Evaluating constant expressions, and returning a constant reference

Specified by:

resolveExpression in interface Expression

Throws:

TemplateException