org.apache.commons.jexl.parser
Class ASTMethod

java.lang.Object
  org.apache.commons.jexl.parser.SimpleNode
      org.apache.commons.jexl.parser.ASTMethod

All Implemented Interfaces:

Node

public class ASTMethod
extends SimpleNode

Method execution.

Field Summary

private static Info

DUMMY dummy velocity info.

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

children, id, parent, parser

Constructor Summary

ASTMethod(int id)
Create the node given an id.

ASTMethod(Parser p, int id)
Create a node with the given parser and id.

Method Summary

java.lang.Object	execute(java.lang.Object obj, JexlContext jc) evaluate a method invocation upon a base object.
java.lang.Object	jjtAccept(ParserVisitor visitor, java.lang.Object data) Accept the visitor.
private java.lang.Number	narrow(java.lang.Number original) Given a Number, return back the value using the smallest type the result will fit into.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

DUMMY

private static final Info DUMMY

dummy velocity info.

Constructor Detail

ASTMethod

public ASTMethod(int id)

Create the node given an id.

Parameters:

id - node id.

ASTMethod

public ASTMethod(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)

execute

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

evaluate a method invocation upon a base object. foo.bar(2)

Overrides:

execute in class SimpleNode

Parameters:

jc - the JexlContext to evaluate against.

obj - The object to have the method invoked.

Returns:

the value of the method invocation.

Throws:

java.lang.Exception - on any error

narrow

private java.lang.Number narrow(java.lang.Number original)

Given a Number, return back the value using the smallest type the result will fit into. This works hand in hand with parameter 'widening' in java method calls, e.g. a call to substring(int,int) with an int and a long will fail, but a call to substring(int,int) with an int and a short will succeed.

Parameters:

original - the original number.

Returns:

a value of the smallest type the original number will fit into.

Since:

1.1