Class ExpressionParseTree

java.lang.Object

org.apache.catalina.ssi.ExpressionParseTree

public class ExpressionParseTree
extends Object

Represents a parsed expression.

Author:

Paul Speed

Constructor Summary

Constructors

Constructor	Description
ExpressionParseTree(String expr, SSIMediator ssiMediator)	Creates a new parse tree for the specified expression.

Method Summary

Modifier and Type	Method	Description
boolean	evaluateTree()	Evaluates the tree and returns true or false.

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionParseTree

public ExpressionParseTree(String expr,
 SSIMediator ssiMediator)
                    throws ParseException

Creates a new parse tree for the specified expression.

Parameters:

expr - The expression string

ssiMediator - Used to evaluated the expressions

Throws:

ParseException - a parsing error occurred

Method Details

evaluateTree

public boolean evaluateTree()
                     throws SSIStopProcessingException

Evaluates the tree and returns true or false. The specified SSIMediator is used to resolve variable references.

Returns:

the evaluation result

Throws:

SSIStopProcessingException - If an error occurs evaluating the tree