Package com.adobe.granite.ui.components

Class ExpressionCustomizer

java.lang.Object

com.adobe.granite.ui.components.ExpressionCustomizer

public class ExpressionCustomizer
extends Object

A mechanic to allow a certain customization for ExpressionResolver.

The customization is only scoped to the current request, not a global one. The resource type implementation needs to use this class explicitly to make the customization available in the request scope going forward.

For example, the resource type implementation of CQ Dialog (/apps/my/dialog) wants to register cqDesign variable so that it can be used in EL expression:

 
 Design design = getDesign();
 ExpressionCustomizer customizer = ExpressionCustomizer.from(request);
 customizer.setVariable("cqDesign", design);
 
 

Then in the content structure, the content author can use cqDesign variable in the property that accepts EL:

 
 + /apps/content/my/dialog
   - sling:resourceType = "my/dialog"
   + field1
     - sling:resourceType = "my/textfield"
     - value = "${cqDesign.id}"
 
 

Constructor Summary

Constructors

Constructor	Description
ExpressionCustomizer()

Method Summary

Modifier and Type	Method	Description
static ExpressionCustomizer	from(ServletRequest request)	Returns the instance from the given request.
Object	getVariable(String name)	Returns the value of the variable with the given name.
boolean	hasVariable(String name)	Returns true if there is a variable with the given name; false otherwise.
void	setVariable(String name, Object value)	Creates a variable with the given name and value.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionCustomizer

public ExpressionCustomizer()

Method Detail

from

@Nonnull
public static ExpressionCustomizer from(@Nonnull
                                        ServletRequest request)

Returns the instance from the given request.

Parameters:

request - the current request acting as the scope of the customization

Returns:

the instance of the customizer

getVariable

@CheckForNull
public Object getVariable(@Nonnull
                          String name)

Returns the value of the variable with the given name.

Parameters:

name - the name of the variable

Returns:

the value of the variable, or null if there is no variable with that name

setVariable

public void setVariable(@Nonnull
                        String name,
                        @Nonnull
                        Object value)

Creates a variable with the given name and value.

Setting an existing variable with the same name will overwrite its value.

Parameters:

name - the name of the variable

value - the value of the variable

hasVariable

public boolean hasVariable(@Nonnull
                           String name)

Returns true if there is a variable with the given name; false otherwise.

Parameters:

name - the name of the variable

Returns:

true if there is a variable with the given name; false otherwise