org.trimou.engine.resolver

Class Decorator<T>

java.lang.Object

org.trimou.engine.resolver.Decorator<T>

All Implemented Interfaces:

Mapper

public class Decorator<T>
extends Object
implements Mapper

This util class can be used to decorate a delegate instance, e.g. to add a computed property to a context object (data) passed to Mustache.render(Object). The following snippet would render: "ooF".

 MustacheEngine engine = MustacheEngineBuilder.newBuilder().build();
 engine.compileMustache("{{reverse}}")
         .render(decorate("Foo").compute("reverse", s -> new StringBuilder(s).reverse().toString()).build(engine));
 

Note that ReflectionResolver and MapResolver must be registered in order to make it work.

Author:

Martin Kouba

See Also:

Decorator.Builder

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Decorator.AbstractBuilder<T,B extends Decorator.AbstractBuilder<T,B>> Logic shared accross various decorator-related builders.
static class	Decorator.Builder<T>

Field Summary

Fields

Modifier and Type	Field and Description
protected T	delegate
static String	KEY_GET_DELEGATE

Method Summary

Modifier and Type	Method and Description
static <T> Decorator.Builder<T>	decorate(T delegate) Returns a decorator builder for the specified delegate.
static <T> Decorator<T>	decorate(T delegate, Map<String,Function<T,Object>> mappings, String delegateKey, Configuration configuration) Returns a decorator instance for the specified delegate and mappings.
Object	get(String key)
String	toString()
static <T> T	unwrap(T instance) This method is recursive.

Methods inherited from class java.lang.Object

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

Field Detail

KEY_GET_DELEGATE

public static final String KEY_GET_DELEGATE

See Also:

Constant Field Values

delegate

protected final T delegate

Method Detail

decorate

public static <T> Decorator.Builder<T> decorate(T delegate)

Returns a decorator builder for the specified delegate.

Parameters:

delegate -

Returns:

a new builder instance

See Also:

Decorator.Builder.build(MustacheEngine)

decorate

public static <T> Decorator<T> decorate(T delegate,
                                        Map<String,Function<T,Object>> mappings,
                                        String delegateKey,
                                        Configuration configuration)

Returns a decorator instance for the specified delegate and mappings.

Parameters:

delegate -

mappings -

delegateKey - May be null

configuration -

Returns:

a new decorator instance

unwrap

public static <T> T unwrap(T instance)

This method is recursive.

Returns:

the underlying delegate instance

get

public Object get(String key)

Specified by:

get in interface Mapper

Returns:

the value to which the specified key is mapped, or null

toString

public String toString()

Overrides:

toString in class Object