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Use adaptTo to transform the Resource to Custom Class

Forum|Forum|2 years ago
August 28, 2023
2 replies
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Hi, Guys,

I am new to AEM and I am facing a problem about converting Resource to Custom Model.

//--------------------------------------------------

ResourceResolver resourceResolver = request.getResourceResolver();

Resource resource = resourceResolver.getResource(path);

//--------------------------------------------------

I use the function above to get the Resource, then I use adaptTo to tranform Resource to CustomText Class.

//--------------------------------------------------

customText = resource.adaptTo(CustomText.class);

//--------------------------------------------------

But the result is null although I can get very property from getValueMap Method. But I cannot

convert it to custom class.

For my current task is that:
1. I have Page A contains Component A and Page B contains Component B
2. I want to get the Component B json or Java instance in Page A or Component A to render the Component B
with Page A together.

It is very appreciated if you guys can help me to solve problem or give me some advice to solve.

Thank you very much.

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Best answer by sherinregi-1

Hi @trifach

Data sly resource will include the component as a whole. If you want to just read one property from another component in a different page this will not help.

You can get to that page and iterate over resources and read that property .See a similar snippet in below URL.

https://stackoverflow.com/questions/70384076/how-to-access-the-properties-of-a-component-from-another-component-which-lies-on

sherinregi-1

New Participant

Hi @trifach

Sling offers an Adapter pattern to conveniently translate objects that implement the Adaptable interface. This interface provides a generic adaptTo() method that translates the object to the class type being passed as the argument. In your case it returns a null because I believe the implementation is not supported here .

Please read the below documentation to know more about supported resource adaptions

https://experienceleague.adobe.com/docs/experience-manager-65/developing/platform/sling-adapters.html?lang=en

On the tasks you had queries

Components are independent of pages. If both the components are allowed on the templates that is used to create page A and page B you can directly add component B in page A if its allowed in layout container policies.

Another approach is you can include component B through code . Place the code on the template for page A or in component A html

eg.

<sly data-sly-resource="${resource @ resourceType='wcm/foundation/components/responsivegrid'}"></sly>

where "wcm/foundation/components/responsivegrid" is path to your component.

Hope this helps

TrifaChAuthor

New Participant

Thank you for replaying. But I have a question about implementation.

<sly data-sly-resource="${resource @ resourceType='wcm/foundation/components/responsivegrid'}"></sly>

How should I access the resource of component B? For example, there is a get function in component B, how should I call it in the component A.

Thank you very much.

sherinregi-1Accepted solution

New Participant

Hi @trifach

Data sly resource will include the component as a whole. If you want to just read one property from another component in a different page this will not help.

You can get to that page and iterate over resources and read that property .See a similar snippet in below URL.

https://stackoverflow.com/questions/70384076/how-to-access-the-properties-of-a-component-from-another-component-which-lies-on

Mahedi_Sabuj

New Participant

Hi @trifach, Can you share your CustomText class implementation? It will be easier to understand the issue.

In some cases, the adaptTo() method might return null due to various reasons, which include:

make sure adapters (CustomText) utilize the @Model annotation as with the parameter adaptables set to Resource.class: @Model(adaptables = Resource.class)
the implementation does not support the target type
an adapter factory handling this case is not active (for example, due to missing service references)
internal condition failed
service is not available

For more details, you can refer to the documentation at: Adobe Experience Manager - Sling Adapters

Mahedi Sabuj

TrifaChAuthor

New Participant

@Model(adaptables = SlingHttpServletRequest.class, adapters = { CustomText.class,
        ComponentExporter.class }, resourceType = CustomTextImpl.RESOURCE_TYPE, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
@Exporter(name = ExporterConstants.SLING_MODEL_EXPORTER_NAME, extensions = ExporterConstants.SLING_MODEL_EXTENSION)
public class CustomTextImpl implements CustomText {
    static final String RESOURCE_TYPE = "application/components/text";

    @ValueMapValue
    private String text;

    @ValueMapValue
    private int size;

    @Self
    private SlingHttpServletRequest request;

    @9944223
    public String getText() {
        return text;
    }

    @9944223
    public int getSize() {
        if (size > 0){
            return size;
        }
        return 14;
    }

    @9944223
    public String getExportedType() {
        return CustomTextImpl.RESOURCE_TYPE;
    }
}

Mahedi_Sabuj

New Participant

Hi @trifach, You are currently adapting Resource to CustomText; however, the Resource.class is absent in the @Model adaptables properties. To resolve this, make sure to include Resource.class in the @Model annotation's adaptable properties. This addition will enable the adaptation of Resource to CustomText.

// SlingHttpServletRequest not required since no use of request
@Model(adaptables = Resource.class
  ....)

Mahedi Sabuj

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