Package in.co.akshitbansal.springwebquery

Class RestrictedPageableArgumentResolver

java.lang.Object

in.co.akshitbansal.springwebquery.RestrictedPageableArgumentResolver

All Implemented Interfaces:

org.springframework.web.method.support.HandlerMethodArgumentResolver

public class RestrictedPageableArgumentResolver
extends Object
implements org.springframework.web.method.support.HandlerMethodArgumentResolver

A custom HandlerMethodArgumentResolver that wraps a standard PageableHandlerMethodArgumentResolver to enforce restrictions on pageable sorting fields based on entity metadata.

This resolver only supports controller method parameters that:

• Are of type Pageable.
• Are annotated with RestrictedPageable.

The resolver delegates the initial parsing of page, size, and sort parameters to Spring's PageableHandlerMethodArgumentResolver. It then validates each requested Sort.Order against the target entity class specified in the RestrictedPageable annotation. Sorting is only allowed on fields explicitly annotated with Sortable.

If a requested sort field is not annotated as Sortable, a QueryException is thrown.

Constructor Summary

Constructors

Constructor	Description
RestrictedPageableArgumentResolver()

Method Summary

Modifier and Type	Method	Description
org.springframework.data.domain.Pageable	resolveArgument(@NonNull org.springframework.core.MethodParameter methodParameter, org.springframework.web.method.support.ModelAndViewContainer mavContainer, @NonNull org.springframework.web.context.request.NativeWebRequest webRequest, org.springframework.web.bind.support.WebDataBinderFactory binderFactory)	Resolves the given Pageable argument from the web request.
boolean	supportsParameter(org.springframework.core.MethodParameter parameter)	Determines whether the given method parameter is supported by this resolver.

Methods inherited from class java.lang.Object

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

Constructor Details

RestrictedPageableArgumentResolver

public RestrictedPageableArgumentResolver()

Method Details

supportsParameter

public boolean supportsParameter(org.springframework.core.MethodParameter parameter)

Determines whether the given method parameter is supported by this resolver.

Supported parameters must:

• Be assignable to Pageable.
• Be annotated with RestrictedPageable.

Specified by:

supportsParameter in interface org.springframework.web.method.support.HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to check

Returns:

true if the parameter is supported, false otherwise

resolveArgument

public org.springframework.data.domain.Pageable resolveArgument(@NonNull
 @NonNull org.springframework.core.MethodParameter methodParameter,
 org.springframework.web.method.support.ModelAndViewContainer mavContainer,
 @NonNull
 @NonNull org.springframework.web.context.request.NativeWebRequest webRequest,
 org.springframework.web.bind.support.WebDataBinderFactory binderFactory)

Resolves the given Pageable argument from the web request.

The process is as follows:

1. Delegate parsing of page, size, and sort parameters to delegate.
2. Retrieve the target entity class from the RestrictedPageable annotation.
3. Validate each requested Sort.Order against the entity's sortable fields. If a field is not annotated with Sortable, a QueryException is thrown.

Specified by:

resolveArgument in interface org.springframework.web.method.support.HandlerMethodArgumentResolver

Parameters:

methodParameter - the method parameter for which the value should be resolved

mavContainer - the ModelAndViewContainer (can be null)

webRequest - the current request

binderFactory - a factory for creating WebDataBinder instances (can be null)

Returns:

a Pageable object containing page, size, and validated sort information

Throws:

QueryException - if any requested sort field is not marked as Sortable