org.apache.commons.jexl.parser
Class SimpleNode

java.lang.Object
  |
  +--org.apache.commons.jexl.parser.SimpleNode

All Implemented Interfaces:

Node

Direct Known Subclasses:

ASTAddNode, ASTAndNode, ASTArrayAccess, ASTAssignment, ASTBitwiseAndNode, ASTBitwiseComplNode, ASTBitwiseOrNode, ASTBitwiseXorNode, ASTBlock, ASTDivNode, ASTEmptyFunction, ASTEQNode, ASTExpression, ASTExpressionExpression, ASTFalseNode, ASTFloatLiteral, ASTForeachStatement, ASTGENode, ASTGTNode, ASTIdentifier, ASTIfStatement, ASTIntegerLiteral, ASTJexlScript, ASTLENode, ASTLTNode, ASTMethod, ASTModNode, ASTMulNode, ASTNENode, ASTNotNode, ASTNullLiteral, ASTOrNode, ASTReference, ASTReferenceExpression, ASTSizeFunction, ASTSizeMethod, ASTStatementExpression, ASTStringLiteral, ASTSubtractNode, ASTTrueNode, ASTUnaryMinusNode, ASTWhileStatement

public class SimpleNode

extends Object

implements Node

useful interface to node. most autogened by javacc

Version:

$Id: SimpleNode.java,v 1.3 2004/02/28 13:45:21 yoavs Exp $

Field Summary

protected Node[]	children
protected int	id
protected Node	parent
protected Parser	parser

Constructor Summary

SimpleNode(int i)

SimpleNode(Parser p, int i)

Method Summary

Object	childrenAccept(ParserVisitor visitor, Object data) Accept the visitor.
void	dump(String prefix)
Object	execute(Object o, JexlContext ctx) Used to let a node calcuate it's value..
boolean	interpret(JexlContext pc) basic interpret - just invoke interpret on all children
Object	jjtAccept(ParserVisitor visitor, Object data) Accept the visitor.
void	jjtAddChild(Node n, int i) This method tells the node to add its argument to the node's list of children.
void	jjtClose() This method is called after all the child nodes have been added.
Node	jjtGetChild(int i) This method returns a child node.
int	jjtGetNumChildren() Return the number of children the node has.
Node	jjtGetParent()
void	jjtOpen() This method is called after the node has been made the current node.
void	jjtSetParent(Node n) This pair of methods are used to inform the node of its parent.
Object	setValue(JexlContext context, Object value) Sets the value for the node - again, only makes sense for some nodes but lazyness tempts me to put it here.
String	toString()
String	toString(String prefix)
Object	value(JexlContext context) Returns the value of the node.

Methods inherited from class java.lang.Object

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

Field Detail

parent

protected Node parent

children

protected Node[] children

id

protected int id

parser

protected Parser parser

Constructor Detail

SimpleNode

public SimpleNode(int i)

SimpleNode

public SimpleNode(Parser p,
                  int i)

Method Detail

jjtOpen

public void jjtOpen()

Description copied from interface: Node

This method is called after the node has been made the current node. It indicates that child nodes can now be added to it.

Specified by:

jjtOpen in interface Node

jjtClose

public void jjtClose()

Description copied from interface: Node

This method is called after all the child nodes have been added.

Specified by:

jjtClose in interface Node

jjtSetParent

public void jjtSetParent(Node n)

Description copied from interface: Node

This pair of methods are used to inform the node of its parent.

Specified by:

jjtSetParent in interface Node

jjtGetParent

public Node jjtGetParent()

Specified by:

jjtGetParent in interface Node

jjtAddChild

public void jjtAddChild(Node n,
                        int i)

Description copied from interface: Node

This method tells the node to add its argument to the node's list of children.

Specified by:

jjtAddChild in interface Node

jjtGetChild

public Node jjtGetChild(int i)

Description copied from interface: Node

This method returns a child node. The children are numbered from zero, left to right.

Specified by:

jjtGetChild in interface Node

jjtGetNumChildren

public int jjtGetNumChildren()

Description copied from interface: Node

Return the number of children the node has.

Specified by:

jjtGetNumChildren in interface Node

jjtAccept

public Object jjtAccept(ParserVisitor visitor,
                        Object data)

Accept the visitor.

Specified by:

jjtAccept in interface Node

childrenAccept

public Object childrenAccept(ParserVisitor visitor,
                             Object data)

Accept the visitor.

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(String prefix)

dump

public void dump(String prefix)

interpret

public boolean interpret(JexlContext pc)
                  throws Exception

basic interpret - just invoke interpret on all children

value

public Object value(JexlContext context)
             throws Exception

Returns the value of the node.

setValue

public Object setValue(JexlContext context,
                       Object value)
                throws Exception

Sets the value for the node - again, only makes sense for some nodes but lazyness tempts me to put it here. Keeps things simple.

execute

public Object execute(Object o,
                      JexlContext ctx)
               throws Exception

Used to let a node calcuate it's value..