AppUtils.java

package com.sopromadze.blogapi.utils;

import org.springframework.http.HttpStatus;

import com.sopromadze.blogapi.exception.BlogapiException;

public class AppUtils {
	public static void validatePageNumberAndSize(int page, int size) {
        if(page < 0) {
            throw new BlogapiException(HttpStatus.BAD_REQUEST, "Page number cannot be less than zero.");
        }

        if(size < 0) {
            throw new BlogapiException(HttpStatus.BAD_REQUEST, "Size number cannot be less than zero.");
        }

        if(size > AppConstants.MAX_PAGE_SIZE) {
        	throw new BlogapiException(HttpStatus.BAD_REQUEST, "Page size must not be greater than " + AppConstants.MAX_PAGE_SIZE);
        }
    }
}