bsh
Class BSHCastExpression

java.lang.Object
  |
  +--bsh.SimpleNode
        |
        +--bsh.BSHCastExpression

All Implemented Interfaces:

Node, java.io.Serializable

class BSHCastExpression

extends SimpleNode

Implement casts. I think it should be possible to simplify some of the code here by using the NameSpace.getAssignableForm() method, but I haven't looked into it.

Field Summary

protected Node[]	children
(package private) Token	firstToken
protected int	id
(package private) Token	lastToken
protected Node	parent
(package private) java.lang.String	sourceFile the source of the text from which this was parsed

Constructor Summary

BSHCastExpression(int id)

Method Summary

static void	castError(java.lang.Class from, java.lang.Class to) Wrap up the ClassCastException in a TargetError so that it can be caught...
static void	castError(java.lang.String from, java.lang.String to)
static java.lang.Object	castObject(java.lang.Object fromValue, java.lang.Class toType) Cast an object to a new type.
static Primitive	castPrimitive(Primitive primValue, java.lang.Class toType) Cast the bsh.Primitive value to a new bsh.Primitive value This is usually a numeric type cast.
void	dump(java.lang.String prefix)
java.lang.Object	eval(CallStack callstack, Interpreter interpreter) This is the general signature for evaluation of a node.
java.lang.Object	eval(NameSpace namespace) Some nodes require only a namespace for evaluation.
SimpleNode	getChild(int i)
int	getLineNumber() Get the line number of the starting token
java.lang.String	getSourceFile() Get the name of the source file (or more generally source) of the text from which this node was parsed.
java.lang.String	getText() Get the text of the tokens comprising this node.
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.
void	prune() Detach this node from its parent.
void	setSourceFile(java.lang.String sourceFile) Set the name of the source file (or more generally source) of the text from which this node was parsed.
java.lang.String	toString()
java.lang.String	toString(java.lang.String prefix)

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

firstToken

Token firstToken

lastToken

Token lastToken

sourceFile

java.lang.String sourceFile

the source of the text from which this was parsed

Constructor Detail

BSHCastExpression

public BSHCastExpression(int id)

Method Detail

eval

public java.lang.Object eval(CallStack callstack,
                             Interpreter interpreter)
                      throws EvalError

Description copied from class: SimpleNode

This is the general signature for evaluation of a node.

Overrides:

eval in class SimpleNode

Returns:

the result of the cast.

EvalError

castObject

public static java.lang.Object castObject(java.lang.Object fromValue,
                                          java.lang.Class toType)
                                   throws EvalError

Cast an object to a new type. This method can handle bsh.Primitive types (representing primitive casts) as well as arbitrary object casts.

Parameters:

fromValue - an Object or bsh.Primitive primitive value

toType - the class type of the cast result, which may include primitive types, e.g. Byte.TYPE

EvalError

castError

public static void castError(java.lang.Class from,
                             java.lang.Class to)
                      throws EvalError

Wrap up the ClassCastException in a TargetError so that it can be caught... Node user should catch and add the node

EvalError

castError

public static void castError(java.lang.String from,
                             java.lang.String to)
                      throws EvalError

EvalError

castPrimitive

public static Primitive castPrimitive(Primitive primValue,
                                      java.lang.Class toType)
                               throws EvalError

Cast the bsh.Primitive value to a new bsh.Primitive value This is usually a numeric type cast. Other cases include: boolean can be cast to boolen null can be cast to any object type void cannot be cast to anything

EvalError

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

getChild

public SimpleNode getChild(int i)

jjtGetNumChildren

public int jjtGetNumChildren()

Description copied from interface: Node

Return the number of children the node has.

Specified by:

jjtGetNumChildren in interface Node

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

public java.lang.String toString(java.lang.String prefix)

dump

public void dump(java.lang.String prefix)

prune

public void prune()

Detach this node from its parent. This is primarily useful in node serialization. (see BSHMethodDeclaration)

eval

public java.lang.Object eval(NameSpace namespace)
                      throws EvalError

Some nodes require only a namespace for evaluation.

EvalError

setSourceFile

public void setSourceFile(java.lang.String sourceFile)

Set the name of the source file (or more generally source) of the text from which this node was parsed.

getSourceFile

public java.lang.String getSourceFile()

Get the name of the source file (or more generally source) of the text from which this node was parsed. This will recursively search up the chain of parent nodes until a source is found or return a string indicating that the source is unknown.

getLineNumber

public int getLineNumber()

Get the line number of the starting token

getText

public java.lang.String getText()

Get the text of the tokens comprising this node.