org.apache.commons.jexl.parser

Class ASTIdentifier

java.lang.Object

org.apache.commons.jexl.parser.SimpleNode

org.apache.commons.jexl.parser.ASTIdentifier

All Implemented Interfaces:

Node

public class ASTIdentifier
extends SimpleNode

Simple identifier - $foo or $foo.bar (both parts are identifiers).

Version:

$Id: ASTIdentifier.java 398199 2006-04-29 16:30:05Z dion $

Author:

Geir Magnusson Jr.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.String	val the name of the variable.

Fields inherited from class org.apache.commons.jexl.parser.SimpleNode

children, id, parent, parser

Constructor Summary

Constructors

Constructor and Description
ASTIdentifier(int id) Create the node given an id.
ASTIdentifier(Parser p, int id) Create a node with the given parser and id.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	execute(java.lang.Object obj, JexlContext jc) returns the value of itself applied to the object.
java.lang.String	getIdentifierString() Gets the name of the variable.
java.lang.Object	jjtAccept(ParserVisitor visitor, java.lang.Object data) Accept the visitor.
java.lang.Object	value(JexlContext jc) Gets the value of this node.

Methods inherited from class org.apache.commons.jexl.parser.SimpleNode

childrenAccept, dump, interpret, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, setValue, toString, toString

Methods inherited from class java.lang.Object

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

Field Detail

val

protected java.lang.String val

the name of the variable.

Constructor Detail

ASTIdentifier

public ASTIdentifier(int id)

Create the node given an id.

Parameters:

id - node id.

ASTIdentifier

public ASTIdentifier(Parser p,
                     int id)

Create a node with the given parser and id.

Parameters:

p - a parser.

id - node 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

Parameters:

visitor - a ParserVisitor.

data - data to be passed along to the visitor.

Returns:

the value from visiting.

See Also:

ParserVisitor.visit(org.apache.commons.jexl.parser.SimpleNode, java.lang.Object)

value

public java.lang.Object value(JexlContext jc)
                       throws java.lang.Exception

Gets the value of this node.

Overrides:

value in class SimpleNode

Parameters:

jc - the context to retrieve values from.

Returns:

the value of the node.

Throws:

java.lang.Exception - when evaluating the operands fails.

execute

public java.lang.Object execute(java.lang.Object obj,
                                JexlContext jc)
                         throws java.lang.Exception

returns the value of itself applied to the object. We assume that an identifier can be gotten via a get(String). e.g. if we have bean.property, 'property' has been parsed as an identifier, and we need to resolve the expression by calling the property getter.

Overrides:

execute in class SimpleNode

Parameters:

obj - the object to evaluate against.

jc - the JexlContext.

Returns:

the resulting value.

Throws:

java.lang.Exception - on any error.

See Also:

ASTArrayAccess.evaluateExpr(Object, Object)

getIdentifierString

public java.lang.String getIdentifierString()

Gets the name of the variable.

Returns:

the variable name.