org.apache.velocity.runtime.directive

Class Macro

java.lang.Object

org.apache.velocity.runtime.directive.Directive

org.apache.velocity.runtime.directive.Macro

All Implemented Interfaces:

Cloneable, DirectiveConstants

public class Macro
extends Directive

Macro implements the macro definition directive of VTL. example: #macro( isnull $i ) #if( $i ) $i #end #end This object is used at parse time to mainly process and register the macro. It is used inline in the parser when processing a directive.

Version:

$Id$

Author:

Geir Magnusson Jr., Henning P. Schmiedehausen

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Macro.MacroArg MacroArgs holds the information for a single argument in a macro definition.

Field Summary

Fields inherited from class org.apache.velocity.runtime.directive.Directive

log, rsvc

Fields inherited from interface org.apache.velocity.runtime.directive.DirectiveConstants

BLOCK, LINE

Constructor Summary

Constructors

Constructor and Description
Macro()

Method Summary

Modifier and Type	Method and Description
void	checkArgs(ArrayList<Integer> argtypes, Token t, String templateName) Check the argument types of a macro call, called by the parser to do validation
String	getName() Return name of this directive.
int	getType() Return type of this directive.
void	init(RuntimeServices rs, InternalContextAdapter context, Node node) How this directive is to be initialized.
boolean	isScopeProvided() Since this class does no processing of content, there is never a need for an internal scope.
static StringBuilder	macroToString(StringBuilder buf, List<Macro.MacroArg> macroArgs, RuntimeServices rsvc) For debugging purposes.
boolean	render(InternalContextAdapter context, Writer writer, Node node) render() doesn't do anything in the final output rendering.

Methods inherited from class org.apache.velocity.runtime.directive.Directive

getColumn, getLine, getScopeName, getTemplate, getTemplateName, makeScope, postRender, preRender, setLocation, setLocation

Methods inherited from class java.lang.Object

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

Constructor Detail

Macro

public Macro()

Method Detail

getName

public String getName()

Return name of this directive.

Specified by:

getName in class Directive

Returns:

The name of this directive.

getType

public int getType()

Return type of this directive.

Specified by:

getType in class Directive

Returns:

The type of this directive.

isScopeProvided

public boolean isScopeProvided()

Since this class does no processing of content, there is never a need for an internal scope.

Overrides:

isScopeProvided in class Directive

Returns:

true if there will be a scope control injected into the context when rendering this directive.

render

public boolean render(InternalContextAdapter context,
                      Writer writer,
                      Node node)
               throws IOException

render() doesn't do anything in the final output rendering. There is no output from a #macro() directive.

Specified by:

render in class Directive

Parameters:

context -

writer -

node -

Returns:

True if the directive rendered successfully.

Throws:

IOException

init

public void init(RuntimeServices rs,
                 InternalContextAdapter context,
                 Node node)
          throws TemplateInitException

Description copied from class: Directive

How this directive is to be initialized.

Overrides:

init in class Directive

Throws:

TemplateInitException

See Also:

Directive.init(org.apache.velocity.runtime.RuntimeServices, org.apache.velocity.context.InternalContextAdapter, org.apache.velocity.runtime.parser.node.Node)

checkArgs

public void checkArgs(ArrayList<Integer> argtypes,
                      Token t,
                      String templateName)
               throws ParseException

Check the argument types of a macro call, called by the parser to do validation

Overrides:

checkArgs in class Directive

Parameters:

argtypes - type, Array of argument types of each argument to the directive for example ParserTreeConstants.JJTWORD

t - token of directive

templateName - the name of the template this directive is referenced in.

Throws:

ParseException

macroToString

public static StringBuilder macroToString(StringBuilder buf,
                                          List<Macro.MacroArg> macroArgs,
                                          RuntimeServices rsvc)

For debugging purposes. Formats the arguments from argArray and appends them to buf.

Parameters:

buf - A StringBuilder. If null, a new StringBuilder is allocated.

macroArgs - Array of macro arguments, containing the #macro() arguments and default values. the 0th is the name.

Returns:

A StringBuilder containing the formatted arguments. If a StringBuilder has passed in as buf, this method returns it.

Since:

1.5