Package com.github.jknack.handlebars

Class Context

java.lang.Object

com.github.jknack.handlebars.Context

public class Context
extends Object

Mustache/Handlebars are contextual template engines. This class represent the 'context stack' of a template.

• Objects and hashes should be pushed onto the context stack.
• All elements on the context stack should be accessible.
• Multiple sections per template should be permitted.
• Failed context lookups should be considered falsy.
• Dotted names should be valid for Section tags.
• Dotted names that cannot be resolved should be considered falsy.
• Dotted Names - Context Precedence: Dotted names should be resolved against former resolutions.

Since:

0.1.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Context.Builder	A context builder.

Field Summary

Fields

Modifier and Type	Field	Description
static String	INLINE_PARTIALS	Inline partials.
static String	INVOCATION_STACK	The qualified name for partials.
static String	PARAM_SIZE	Number of parameters of a helper.
static String	PARTIALS	The qualified name for partials.

Method Summary

Modifier and Type	Method	Description
Context	combine(String name, Object model)	Insert a new attribute in the context-stack.
Context	combine(Map<String,?> model)	Insert all the attributes in the context-stack.
static Context	copy(Context context, Object model)	Creates a new context but keep the data attribute.
<T> T	data(String name)	Read the attribute from the data storage.
Context	data(String name, Object value)	Set an attribute in the data storage.
Context	data(Map<String,?> attributes)	Store the map in the data storage.
void	destroy()	Destroy this context by cleaning up instance attributes.
Object	get(String key)	Lookup the given key inside the context stack.
Object	get(String key, boolean parentScopeResolution)	Lookup the given key inside the context stack.
Object	get(List<PathExpression> path)	Lookup the given key inside the context stack.
boolean	isBlockParams()
Object	model()	Resolved as '.' or 'this' inside templates.
static Context	newBlockParamContext(Context parent, List<String> names, List<Object> values)	Creates a new block param context.
static Context.Builder	newBuilder(Context parent, Object model)	Start a new context builder.
static Context.Builder	newBuilder(Object model)	Start a new context builder.
static Context	newContext(Context parent, Object model)	Creates a new child context.
static Context	newContext(Object model)	Creates a new root context.
static Context	newPartialContext(Context ctx, String scope, Map<String,Object> hash)	Creates a new partial context.
Context	parent()	The parent context or null.
Set<Map.Entry<String,Object>>	propertySet()	List all the properties and values of model().
Set<Map.Entry<String,Object>>	propertySet(Object context)	List all the properties and values for the given object.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

PARTIALS

public static final String PARTIALS

The qualified name for partials. Internal use.

INLINE_PARTIALS

public static final String INLINE_PARTIALS

Inline partials.

See Also:

Constant Field Values

INVOCATION_STACK

public static final String INVOCATION_STACK

The qualified name for partials. Internal use.

PARAM_SIZE

public static final String PARAM_SIZE

Number of parameters of a helper. Internal use.

Method Detail

combine

public Context combine(String name,
                       Object model)

Insert a new attribute in the context-stack.

Parameters:

name - The attribute's name. Required.

model - The model data.

Returns:

This context.

combine

public Context combine(Map<String,?> model)

Insert all the attributes in the context-stack.

Parameters:

model - The model attributes.

Returns:

This context.

data

public <T> T data(String name)

Read the attribute from the data storage.

Type Parameters:

T - Data type.

Parameters:

name - The attribute's name.

Returns:

The attribute value or null.

data

public Context data(String name,
                    Object value)

Set an attribute in the data storage.

Parameters:

name - The attribute's name. Required.

value - The attribute's value. Required.

Returns:

This context.

data

public Context data(Map<String,?> attributes)

Store the map in the data storage.

Parameters:

attributes - The attributes to add. Required.

Returns:

This context.

model

public final Object model()

Resolved as '.' or 'this' inside templates.

Returns:

The model or data.

parent

public final Context parent()

The parent context or null.

Returns:

The parent context or null.

propertySet

public Set<Map.Entry<String,Object>> propertySet(Object context)

List all the properties and values for the given object.

Parameters:

context - The context object.

Returns:

All the properties and values for the given object.

propertySet

public Set<Map.Entry<String,Object>> propertySet()

List all the properties and values of model().

Returns:

All the properties and values of model().

isBlockParams

public boolean isBlockParams()

Returns:

True, if this context is a block param context.

get

public Object get(List<PathExpression> path)

Lookup the given key inside the context stack.

• Objects and hashes should be pushed onto the context stack.
• All elements on the context stack should be accessible.
• Multiple sections per template should be permitted.
• Failed context lookups should be considered falsey.
• Dotted names should be valid for Section tags.
• Dotted names that cannot be resolved should be considered falsey.
• Dotted Names - Context Precedence: Dotted names should be resolved against former resolutions.

Parameters:

path - The object path.

Returns:

The value associated to the given key or null if no value is found.

get

public Object get(String key)

Lookup the given key inside the context stack.

• Objects and hashes should be pushed onto the context stack.
• All elements on the context stack should be accessible.
• Multiple sections per template should be permitted.
• Failed context lookups should be considered falsey.
• Dotted names should be valid for Section tags.
• Dotted names that cannot be resolved should be considered falsey.
• Dotted Names - Context Precedence: Dotted names should be resolved against former resolutions.

Parameters:

key - The object key.

Returns:

The value associated to the given key or null if no value is found.

get

public Object get(String key,
                  boolean parentScopeResolution)

Lookup the given key inside the context stack.

• Objects and hashes should be pushed onto the context stack.
• All elements on the context stack should be accessible.
• Multiple sections per template should be permitted.
• Failed context lookups should be considered falsey.
• Dotted names should be valid for Section tags.
• Dotted names that cannot be resolved should be considered falsey.
• Dotted Names - Context Precedence: Dotted names should be resolved against former resolutions.

Parameters:

key - The object key.

parentScopeResolution - False, if we want to restrict lookup to current scope.

Returns:

The value associated to the given key or null if no value is found.

destroy

public void destroy()

Destroy this context by cleaning up instance attributes.

toString

public String toString()

Overrides:

toString in class Object

newBuilder

public static Context.Builder newBuilder(Context parent,
                                         Object model)

Start a new context builder.

Parameters:

parent - The parent context. Required.

model - The model data.

Returns:

A new context builder.

newBuilder

public static Context.Builder newBuilder(Object model)

Start a new context builder.

Parameters:

model - The model data.

Returns:

A new context builder.

newContext

public static Context newContext(Context parent,
                                 Object model)

Creates a new child context.

Parameters:

parent - The parent context. Required.

model - The model data.

Returns:

A new child context.

newBlockParamContext

public static Context newBlockParamContext(Context parent,
                                           List<String> names,
                                           List<Object> values)

Creates a new block param context.

Parameters:

parent - The parent context. Required.

names - A list of names to set in the block param context.

values - A list of values to set in the block param context.

Returns:

A new block param context.

newPartialContext

public static Context newPartialContext(Context ctx,
                                        String scope,
                                        Map<String,Object> hash)

Creates a new partial context.

Parameters:

ctx - Current scope.

scope - Scope switch.

hash - Partial hash.

Returns:

A new context.

newContext

public static Context newContext(Object model)

Creates a new root context.

Parameters:

model - The model data.

Returns:

A new root context.

copy

public static Context copy(Context context,
                           Object model)

Creates a new context but keep the data attribute.

Parameters:

context - Context to extract the data attribute.

model - A model/data.

Returns:

A new context.