Package com.blackrook.expression.node

Class ExpressionDirective

java.lang.Object

com.blackrook.expression.node.ExpressionDirective

All Implemented Interfaces:

ExpressionNode

public class ExpressionDirective
extends Object
implements ExpressionNode

Single expression directive.

Author:

Matthew Tropiano

Method Summary

Modifier and Type	Method	Description
static ExpressionDirective	create(ExpressionDirectiveType type)	Creates a new Expression directive.
static ExpressionDirective	create(ExpressionDirectiveType type, boolean operand)	Creates a new Expression directive.
static ExpressionDirective	create(ExpressionDirectiveType type, double operand)	Creates a new Expression directive.
static ExpressionDirective	create(ExpressionDirectiveType type, long operand)	Creates a new Expression directive.
static ExpressionDirective	create(ExpressionDirectiveType type, String operand)	Creates a new Expression directive.
boolean	execute(ExpressionStack stack, ExpressionVariableContext context)	Executes this node.
Object	getOperand()
ExpressionDirectiveType	getType()
boolean	isCollapsable()	Checks if this node is collapsable.
String	toString()
void	writeBytes(OutputStream out)	Write value as bytes (for digest later).

Methods inherited from class java.lang.Object

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

Method Detail

create

public static ExpressionDirective create(ExpressionDirectiveType type)

Creates a new Expression directive.

Parameters:

type - the directive type.

Returns:

a new expression directive.

create

public static ExpressionDirective create(ExpressionDirectiveType type,
                                         boolean operand)

Creates a new Expression directive.

Parameters:

type - the directive type.

operand - the operand.

Returns:

a new expression directive.

create

public static ExpressionDirective create(ExpressionDirectiveType type,
                                         long operand)

Creates a new Expression directive.

Parameters:

type - the directive type.

operand - the operand.

Returns:

a new expression directive.

create

public static ExpressionDirective create(ExpressionDirectiveType type,
                                         double operand)

Creates a new Expression directive.

Parameters:

type - the directive type.

operand - the operand.

Returns:

a new expression directive.

create

public static ExpressionDirective create(ExpressionDirectiveType type,
                                         String operand)

Creates a new Expression directive.

Parameters:

type - the directive type.

operand - the operand.

Returns:

a new expression directive.

getType

public ExpressionDirectiveType getType()

getOperand

public Object getOperand()

isCollapsable

public boolean isCollapsable()

Description copied from interface: ExpressionNode

Checks if this node is collapsable.

Specified by:

isCollapsable in interface ExpressionNode

Returns:

true if so, false if not.

execute

public boolean execute(ExpressionStack stack,
                       ExpressionVariableContext context)

Description copied from interface: ExpressionNode

Executes this node.

Specified by:

execute in interface ExpressionNode

Parameters:

stack - the stack to use.

context - the context for added variables.

Returns:

if false, stop expression calculation, else if true, continue.

writeBytes

public void writeBytes(OutputStream out)
                throws IOException

Description copied from interface: ExpressionNode

Write value as bytes (for digest later).

Specified by:

writeBytes in interface ExpressionNode

Parameters:

out - the output stream.

Throws:

IOException - on a write error.

toString

public String toString()

Overrides:

toString in class Object