org.trimou.handlebars

Class EvalHelper

java.lang.Object

org.trimou.engine.config.AbstractConfigurationAware

org.trimou.handlebars.AbstractHelper

org.trimou.handlebars.BasicHelper

org.trimou.handlebars.EvalHelper

All Implemented Interfaces:

ConfigurationAware, Helper

public class EvalHelper
extends BasicHelper

Allows to build the key dynamically and evaluate it afterwards.

First a key is built from the params, or rather their Object.toString() representations, by default dot notation is used. Then the helper attempts to find the value from the context. If the helper represents a section and the value is not null the value is pushed on the context stack and the section is rendered. If the helper represents a variable and the value is null, the current MissingValueHandler is used. If the helper represents a variable and the final value is not null the the value's Object.toString() is rendered.

 {{eval "foo" "bar"}}
 

is equivalent to:

 {{foo.bar}}
 

On the other hand:

 {{#eval "list" idx}}
  Element name: {{name}}
 {{/eval}}
 

is equivalent to (provided the idx evaluates to 1):

 {{#with list.1}}
  Element name: {{name}}
 {{/with}}
 

Author:

Martin Kouba

See Also:

EvalHelper.Notation, KeySplitter

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EvalHelper.BracketDotNotation
static class	EvalHelper.DotNotation
static interface	EvalHelper.Notation

Field Summary

Fields inherited from class org.trimou.handlebars.BasicHelper

HELPER_TAG_TYPES

Fields inherited from class org.trimou.engine.config.AbstractConfigurationAware

configuration

Constructor Summary

Constructors

Constructor and Description
EvalHelper()
EvalHelper(EvalHelper.Notation notation)

Method Summary

Modifier and Type	Method and Description
void	execute(Options options) Execute the helper.

Methods inherited from class org.trimou.handlebars.BasicHelper

allowedTagTypes, getRequiredHashKeys, getSupportedHashKeys, numberOfRequiredHashEntries, numberOfRequiredParameters, validate

Methods inherited from class org.trimou.handlebars.AbstractHelper

append, convertAndAppend, convertValue, init, isSection, isUnescapeVariable, isVariable

Methods inherited from class org.trimou.engine.config.AbstractConfigurationAware

checkNotInitialized, init

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.trimou.engine.config.ConfigurationAware

getConfigurationKeys, init

Constructor Detail

EvalHelper

public EvalHelper()

See Also:

EvalHelper.DotNotation

EvalHelper

public EvalHelper(EvalHelper.Notation notation)

Parameters:

notation - The notation to be used when constructing keys

Method Detail

execute

public void execute(Options options)

Description copied from interface: Helper

Execute the helper.