org.apache.commons.jexl.parser

Class ASTSizeFunction

java.lang.Object

org.apache.commons.jexl.parser.SimpleNode

org.apache.commons.jexl.parser.ASTSizeFunction

All Implemented Interfaces:

Node

public class ASTSizeFunction
extends SimpleNode

generalized size() function for all classes we can think of.

Version:

$Id: ASTSizeFunction.java 548229 2007-06-18 06:11:32Z dion $

Author:

Geir Magnusson Jr., Mark H. Wilkinson

Field Summary

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

children, id, parent, parser

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
Object	jjtAccept(ParserVisitor visitor, Object data) Accept the visitor.
static int	sizeOf(Object val, Uberspect uberspect) Calculate the size of various types: Collection, Array, Map, String, and anything that has a int size() method.
Object	value(JexlContext jc) Gets the value of this node.

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

childrenAccept, dump, execute, getUberspect, 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

Constructor Detail

ASTSizeFunction

public ASTSizeFunction(int id)

Create the node given an id.

Parameters:

id - node id.

ASTSizeFunction

public ASTSizeFunction(Parser p,
                       int id)

Create a node with the given parser and id.

Parameters:

p - a parser.

id - node id.

Method Detail

jjtAccept

public Object jjtAccept(ParserVisitor visitor,
                        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 Object value(JexlContext jc)
             throws 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:

Exception - when evaluating the operands fails.

sizeOf

public static int sizeOf(Object val,
                         Uberspect uberspect)
                  throws Exception

Calculate the size of various types: Collection, Array, Map, String, and anything that has a int size() method.

Parameters:

val - the object to get the size of.

uberspect -

Returns:

the size of val

Throws:

Exception - if the size cannot be determined.