com.github.jknack.handlebars

Interface HelperRegistry

All Known Implementing Classes:

DefaultHelperRegistry, Handlebars

public interface HelperRegistry

The helper registry.

Since:

1.2.0

Author:

edgar

Field Summary

Fields

Modifier and Type	Field and Description
static String	HELPER_MISSING The missing helper's name.

Method Summary

Methods

Modifier and Type	Method and Description
Decorator	decorator(String name) Find a decorator by name.
<C> Helper<C>	helper(String name) Find a helper by name.
Set<Map.Entry<String,Helper<?>>>	helpers() List all the helpers from registry.
HelperRegistry	registerDecorator(String name, Decorator decorator) Register a decorator and make it accessible via decorator(String).
<H> HelperRegistry	registerHelper(String name, Helper<H> helper) Register a helper in the helper registry.
<H> HelperRegistry	registerHelperMissing(Helper<H> helper) Register the special helper missing in the registry.
HelperRegistry	registerHelpers(Class<?> helperSource) Register all the helper methods for the given helper source.
HelperRegistry	registerHelpers(File input) Register helpers from a JavaScript source.
HelperRegistry	registerHelpers(Object helperSource) Register all the helper methods for the given helper source.
HelperRegistry	registerHelpers(String filename, InputStream source) Register helpers from a JavaScript source.
HelperRegistry	registerHelpers(String filename, Reader source) Register helpers from a JavaScript source.
HelperRegistry	registerHelpers(String filename, String source) Register helpers from a JavaScript source.
HelperRegistry	registerHelpers(URI location) Register helpers from a JavaScript source.

Field Detail

HELPER_MISSING

static final String HELPER_MISSING

The missing helper's name.

See Also:

Constant Field Values

Method Detail

helper

<C> Helper<C> helper(String name)

Find a helper by name.

Type Parameters:

C - The helper runtime type.

Parameters:

name - The helper's name. Required.

Returns:

A helper or null if it's not found.

helpers

Set<Map.Entry<String,Helper<?>>> helpers()

List all the helpers from registry.

Returns:

Available helpers in the registry.

registerHelper

<H> HelperRegistry registerHelper(String name,
                                Helper<H> helper)

Register a helper in the helper registry.

Type Parameters:

H - The helper runtime type.

Parameters:

name - The helper's name. Required.

helper - The helper object. Required.

Returns:

This handlebars.

registerHelperMissing

<H> HelperRegistry registerHelperMissing(Helper<H> helper)

Register the special helper missing in the registry.

Type Parameters:

H - The helper runtime type.

Parameters:

helper - The helper object. Required.

Returns:

This handlebars.

registerHelpers

HelperRegistry registerHelpers(Object helperSource)

Register all the helper methods for the given helper source.

A helper method looks like:

 public static? CharSequence methodName(context?, parameter*, options?) {
 }
 

Where:

• A method can/can't be static
• The method's name became the helper's name
• Context, parameters and options are all optional
• If context and options are present they must be the first and last method arguments.

Instance and static methods will be registered as helpers.

Parameters:

helperSource - The helper source. Required.

Returns:

This handlebars object.

registerHelpers

HelperRegistry registerHelpers(Class<?> helperSource)

Register all the helper methods for the given helper source.

A helper method looks like:

 public static? CharSequence methodName(context?, parameter*, options?) {
 }
 

Where:

• A method can/can't be static
• The method's name became the helper's name
• Context, parameters and options are all optional
• If context and options are present they must be the first and last method arguments.

Only static methods will be registered as helpers.

Enums are supported too

Parameters:

helperSource - The helper source. Enums are supported. Required.

Returns:

This handlebars object.

registerHelpers

HelperRegistry registerHelpers(URI location)
                               throws Exception

Register helpers from a JavaScript source.

A JavaScript source file looks like:

  Handlebars.registerHelper('hey', function (context) {
    return 'Hi ' + context.name;
  });
  ...
  Handlebars.registerHelper('hey', function (context, options) {
    return 'Hi ' + context.name + options.hash['x'];
  });
  ...
  Handlebars.registerHelper('hey', function (context, p1, p2, options) {
    return 'Hi ' + context.name + p1 + p2 + options.hash['x'];
  });
  ...
 

To keep your helpers reusable between server and client avoid DOM manipulation.

Parameters:

location - A classpath location. Required.

Returns:

This handlebars object.

Throws:

Exception - If the JavaScript helpers can't be registered.

registerHelpers

HelperRegistry registerHelpers(File input)
                               throws Exception

Register helpers from a JavaScript source.

A JavaScript source file looks like:

  Handlebars.registerHelper('hey', function (context) {
    return 'Hi ' + context.name;
  });
  ...
  Handlebars.registerHelper('hey', function (context, options) {
    return 'Hi ' + context.name + options.hash['x'];
  });
  ...
  Handlebars.registerHelper('hey', function (context, p1, p2, options) {
    return 'Hi ' + context.name + p1 + p2 + options.hash['x'];
  });
  ...
 

To keep your helpers reusable between server and client avoid DOM manipulation.

Parameters:

input - A JavaScript file name. Required.

Returns:

This handlebars object.

Throws:

Exception - If the JavaScript helpers can't be registered.

registerHelpers

HelperRegistry registerHelpers(String filename,
                             Reader source)
                               throws Exception

Register helpers from a JavaScript source.

A JavaScript source file looks like:

  Handlebars.registerHelper('hey', function (context) {
    return 'Hi ' + context.name;
  });
  ...
  Handlebars.registerHelper('hey', function (context, options) {
    return 'Hi ' + context.name + options.hash['x'];
  });
  ...
  Handlebars.registerHelper('hey', function (context, p1, p2, options) {
    return 'Hi ' + context.name + p1 + p2 + options.hash['x'];
  });
  ...
 

To keep your helpers reusable between server and client avoid DOM manipulation.

Parameters:

filename - The file name (just for debugging purpose). Required.

source - The JavaScript source. Required.

Returns:

This handlebars object.

Throws:

Exception - If the JavaScript helpers can't be registered.

registerHelpers

HelperRegistry registerHelpers(String filename,
                             InputStream source)
                               throws Exception

Register helpers from a JavaScript source.

A JavaScript source file looks like:

  Handlebars.registerHelper('hey', function (context) {
    return 'Hi ' + context.name;
  });
  ...
  Handlebars.registerHelper('hey', function (context, options) {
    return 'Hi ' + context.name + options.hash['x'];
  });
  ...
  Handlebars.registerHelper('hey', function (context, p1, p2, options) {
    return 'Hi ' + context.name + p1 + p2 + options.hash['x'];
  });
  ...
 

To keep your helpers reusable between server and client avoid DOM manipulation.

Parameters:

filename - The file name (just for debugging purpose). Required.

source - The JavaScript source. Required.

Returns:

This handlebars object.

Throws:

Exception - If the JavaScript helpers can't be registered.

registerHelpers

HelperRegistry registerHelpers(String filename,
                             String source)
                               throws Exception

Register helpers from a JavaScript source.

A JavaScript source file looks like:

  Handlebars.registerHelper('hey', function (context) {
    return 'Hi ' + context.name;
  });
  ...
  Handlebars.registerHelper('hey', function (context, options) {
    return 'Hi ' + context.name + options.hash['x'];
  });
  ...
  Handlebars.registerHelper('hey', function (context, p1, p2, options) {
    return 'Hi ' + context.name + p1 + p2 + options.hash['x'];
  });
  ...
 

To keep your helpers reusable between server and client avoid DOM manipulation.

Parameters:

filename - The file name (just for debugging purpose). Required.

source - The JavaScript source. Required.

Returns:

This registry.

Throws:

Exception - If the JavaScript helpers can't be registered.

decorator

Decorator decorator(String name)

Find a decorator by name.

Parameters:

name - A decorator's name.

Returns:

A decorator or null.

Since:

4.0.0

registerDecorator

HelperRegistry registerDecorator(String name,
                               Decorator decorator)

Register a decorator and make it accessible via decorator(String).

Parameters:

name - A decorator's name. Required.

decorator - A decorator. Required.

Returns:

This registry.

Since:

4.0.0