Examples of javax.ws.rs.core.GenericEntity

javax.ws.rs.core.GenericEntity
Represents a message entity of a generic type {@code T}.
Normally type erasure removes generic type information such that a {@link Response} instance that contains, e.g., an entity of type{@code List} appears to contain a raw {@code List} at runtime.When the generic type is required to select a suitable {@link javax.ws.rs.ext.MessageBodyWriter}, this class may be used to wrap the entity and capture its generic type.

There are two ways to create an instance:
1. Create a (typically anonymous) subclass of this class which enables retrieval of the type information at runtime despite type erasure. For example, the following code shows how to create a {@link Response} containing an entity of type {@code List
  } whosegeneric type will be available at runtime for selection of a suitable {@link javax.ws.rs.ext.MessageBodyWriter}:
```
List<String> list = new ArrayList<String>(); GenericEntity<List<String>> entity = new GenericEntity<List<String>>(list) {}; Response response = Response.ok(entity).build();
```
  where {@code list} is the instance of {@code List}that will form the response body and entity is an instance of an anonymous subclass of {@code GenericEntity}.
2. Create an instance directly by supplying the generic type information with the entity. For example the following code shows how to create a response containing the result of a method invoked via reflection:
```
Method method = ...; GenericEntity<Object> entity = new GenericEntity<Object>( method.invoke(...), method.getGenericReturnType()); Response response = Response.ok(entity).build();
```
@param < T> response entity instance type @author Paul Sandoz @author Marc Hadley @see GenericType @since 1.0

      }
      Class clazz = entity.getClass();
      Type type = null;
      if (entity instanceof GenericEntity)
      {
         GenericEntity gen = (GenericEntity) entity;
         clazz = gen.getRawType();
         type = gen.getType();
      }
      for (MediaType accept : accepts)
      {
         if (providerFactory.getMessageBodyWriter(clazz, type, null, accept) != null)
         {

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      }
      Class clazz = entity.getClass();
      Type type = this.genericReturnType;
      if (entity instanceof GenericEntity)
      {
         GenericEntity gen = (GenericEntity) entity;
         clazz = gen.getRawType();
         type = gen.getType();
      }
      for (MediaType accept : accepts)
      {
         if (providerFactory.getMessageBodyWriter(clazz, type, method.getAnnotations(), accept) != null)
         {

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      Type generic = genericType;
      Class type = entity.getClass();
      Object ent = entity;
      if (entity instanceof GenericEntity)
      {
         GenericEntity ge = (GenericEntity) entity;
         generic = ge.getType();
         ent = ge.getEntity();
         type = ent.getClass();
      }
      MediaType contentType = resolveContentType();
      MessageBodyWriter writer = providerFactory.getMessageBodyWriter(
              type, generic, annotations, contentType);

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        Class<?> entityType = jsonEntity.getClass();


        final boolean genericEntityUsed = jsonEntity instanceof GenericEntity;


        if (genericEntityUsed) {
            GenericEntity ge = (GenericEntity)jsonEntity;
            jsonEntity = ge.getEntity();
            entityGenericType = ge.getType();
            entityType = ge.getRawType();
        }


        final boolean isJavaScript = isJavascript(mediaType);
        final MediaType workerMediaType = isJavaScript ? MediaType.APPLICATION_JSON_TYPE : mediaType;

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        if (entity == null)
            return;


        Type entityType = null;
        if (entity instanceof GenericEntity) {
            final GenericEntity ge = (GenericEntity)entity;
            entityType = ge.getType();
            entity = ge.getEntity();
        } else {
            entityType = entity.getClass();
        }
        final Class entityClass = entity.getClass();

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            final Object e = cr.getEntity();
            if (e == null)
                throw new IllegalArgumentException("The entity of the client request is null");


            if (e instanceof GenericEntity) {
                final GenericEntity ge = (GenericEntity)e;
                this.entity = ge.getEntity();
                this.entityType = ge.getType();
            } else {
                this.entity = e;
                this.entityType = entity.getClass();
            }
            final Class entityClass = entity.getClass();

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    public void setEntity(Object entity, Type entityType) {
        this.originalEntity = this.entity = entity;
        this.entityType = entityType;
        if (this.entity instanceof GenericEntity) {
            final GenericEntity ge = (GenericEntity)this.entity;
            this.entity = ge.getEntity();
            this.entityType = ge.getType();
        }
    }

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        Type entityType = entity.getClass();


        // if the entity is generic, get specific type and class
        if (entity instanceof GenericEntity) {
            final GenericEntity generic = (GenericEntity) entity;
            entityType = generic.getType(); // overwrite
            entity = generic.getEntity();
        }


        final Class entityClass = entity.getClass();


        ByteArrayOutputStream out = new ByteArrayOutputStream();

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         public Type[] getActualTypeArguments()
         {
            return new Type[]{getEntityClass()};
         }
      };
      return Response.ok(new GenericEntity(result, responseType)
      {
      }, selectedMediaType).build();
   }

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      }


      T2 id = unmarshallId(rawId);
      T entity = getEntity(id);


      return Response.ok(new GenericEntity(entity, getEntityClass())
      {
      }, selectedMediaType).build();
   }

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