org.apache.velocity.runtime.parser.node
Class ASTIdentifier

java.lang.Object
  |
  +--org.apache.velocity.runtime.parser.node.SimpleNode
        |
        +--org.apache.velocity.runtime.parser.node.ASTIdentifier

All Implemented Interfaces:

Node

public class ASTIdentifier

extends SimpleNode

ASTIdentifier.java Method support for identifiers : $foo mainly used by ASTRefrence Introspection is now moved to 'just in time' or at render / execution time. There are many reasons why this has to be done, but the primary two are thread safety, to remove any context-derived information from class member variables.

Version:

$Id: ASTIdentifier.java,v 1.16 2001/11/19 13:53:08 geirm Exp $

Author:

Jason van Zyl, Geir Magnusson Jr.

Field Summary

private java.lang.String

identifier

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

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

Constructor Summary

ASTIdentifier(int id)

ASTIdentifier(Parser p, int id)

Method Summary

private AbstractExecutor	doIntrospection(java.lang.Class data) introspects the class to find the method name of the node, or if that fails, treats the reference object as a map and treats the identifier as a key in that map.
java.lang.Object	execute(java.lang.Object o, InternalContextAdapter context) invokes the method on the object passed in
java.lang.Object	init(InternalContextAdapter context, java.lang.Object data) simple init - don't do anything that is context specific.
java.lang.Object	jjtAccept(ParserVisitor visitor, java.lang.Object data) Accept the visitor.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

identifier

private java.lang.String identifier

Constructor Detail

ASTIdentifier

public ASTIdentifier(int id)

ASTIdentifier

public ASTIdentifier(Parser p,
                     int id)

Method Detail

jjtAccept

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

Accept the visitor.

Overrides:

jjtAccept in class SimpleNode

init

public java.lang.Object init(InternalContextAdapter context,
                             java.lang.Object data)
                      throws java.lang.Exception

simple init - don't do anything that is context specific. just get what we need from the AST, which is static.

Overrides:

init in class SimpleNode

doIntrospection

private AbstractExecutor doIntrospection(java.lang.Class data)
                                  throws java.lang.Exception

introspects the class to find the method name of the node, or if that fails, treats the reference object as a map and treats the identifier as a key in that map. This needs work.

Parameters:

data - Class to be introspected

execute

public java.lang.Object execute(java.lang.Object o,
                                InternalContextAdapter context)
                         throws MethodInvocationException

invokes the method on the object passed in

Overrides:

execute in class SimpleNode