org.apache.velocity.runtime.parser.node

Class ASTEQNode

java.lang.Object

org.apache.velocity.runtime.parser.node.SimpleNode

org.apache.velocity.runtime.parser.node.ASTEQNode

All Implemented Interfaces:

Node

public class ASTEQNode
extends SimpleNode

Handles the equivalence operator == This operator requires that the LHS and RHS are both of the same Class.

Version:

$Id: ASTEQNode.java,v 1.9.4.1 2004/03/03 23:22:58 geirm Exp $

Field Summary

Fields inherited from class org.apache.velocity.runtime.parser.node.SimpleNode

children, first, id, info, invalid, last, parent, parser, rsvc, state

Constructor Summary

Constructors

Constructor and Description
ASTEQNode(int id)
ASTEQNode(Parser p, int id)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	evaluate(InternalContextAdapter context) Calculates the value of the logical expression arg1 == arg2 All class types are supported.
java.lang.Object	jjtAccept(ParserVisitor visitor, java.lang.Object data) Accept the visitor.
java.lang.Object	value(InternalContextAdapter context)

Methods inherited from class org.apache.velocity.runtime.parser.node.SimpleNode

childrenAccept, dump, execute, getColumn, getFirstToken, getInfo, getLastToken, getLine, getType, init, isInvalid, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, literal, render, setFirstToken, setInfo, setInvalid, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTEQNode

public ASTEQNode(int id)

ASTEQNode

public ASTEQNode(Parser p,
         int id)

Method Detail

jjtAccept

public java.lang.Object jjtAccept(ParserVisitor visitor,
                         java.lang.Object data)

Accept the visitor.

Specified by:

jjtAccept in interface Node

Overrides:

jjtAccept in class SimpleNode

evaluate

public boolean evaluate(InternalContextAdapter context)
                 throws MethodInvocationException

Calculates the value of the logical expression arg1 == arg2 All class types are supported. Uses equals() to determine equivalence. This should work as we represent with the types we already support, and anything else that implements equals() to mean more than identical references.

Specified by:

evaluate in interface Node

Overrides:

evaluate in class SimpleNode

Parameters:

context - internal context used to evaluate the LHS and RHS

Returns:

true if equivalent, false if not equivalent, false if not compatible arguments, or false if either LHS or RHS is null

Throws:

MethodInvocationException

value

public java.lang.Object value(InternalContextAdapter context)
                       throws MethodInvocationException

Specified by:

value in interface Node

Overrides:

value in class SimpleNode

Throws:

MethodInvocationException