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ORM filter pattern


ORM filter pattern

By : Sheel Sadan
Date : November 21 2020, 03:00 PM
around this issue Peewee uses data-structures to represent things. Models, fields, expressions, queries, etc. When you pass these data-structures to be executed, they are converted into SQL and then returned as a database cursor. Then there is separate logic which reconstructs the flat row-tuples returned by the cursor into the appropriate model instances.
The peewee code-base is pretty small, ~5000 lines -- should give you an idea. Take a look at the 3.0a branch as it's a lot easier to read. https://github.com/coleifer/peewee/blob/3.0a/peewee.py
code :


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How to write "Intercepting Filter Pattern" like Java's servlet filter in Flex?

How to write "Intercepting Filter Pattern" like Java's servlet filter in Flex?


By : Mingma2013
Date : March 29 2020, 07:55 AM
it helps some times Create a class which will play a role of connector between your program and server. Put there event listener for server events. Create a constant types for different types of events that server could send to your program. Put a switch into event listener that receive these events, and re dispatch them to the specific places, depending on which type of the event it was.
Using filter design pattern for dynamically creating a filter criteria

Using filter design pattern for dynamically creating a filter criteria


By : Igor
Date : March 29 2020, 07:55 AM
will help you You should design the solution of your problem statement by using Intercepting Filter Pattern.
Below is the code using with Intercepting Filter Pattern:
code :
public class Person
{

    public String FirstName { get; set; }
    public String LastName { get; set; }
    public String Phone { get; set; }
    public String Email { get; set; }
}

public interface ICriteria
{
         List<Person> MeetCriteria(List<Person> persons);
}

  public class CriteriaFirstName : ICriteria
    {
        private string searchCriteria;
        public CriteriaFirstName(string searchCriteria)
        {
            this.searchCriteria = searchCriteria;
        }
        public List<Person> MeetCriteria(List<Person> persons)
        {
            List<Person> personsData = new List<Person>();
            foreach (var item in persons)
            {
                if (item.FirstName.ToUpper().Equals(searchCriteria.ToUpper()))
                {
                    personsData.Add(item);
                }
            }

            return personsData;
        }


    public class CriteriaLastName : ICriteria
    {
        private string searchCriteria;
        public CriteriaLastName(string searchCriteria)
        {
            this.searchCriteria = searchCriteria;
        }

        public List<Person> MeetCriteria(List<Person> persons)
        {
            List<Person> personsData = new List<Person>();
            foreach (var item in persons)
            {
                if (item.LastName.ToUpper().Equals(searchCriteria.ToUpper()))
                {
                    personsData.Add(item);
                }
            }

            return personsData;
        }
    }

 public class CriteriaLastPhone : ICriteria
    {
        private string searchCriteria;
        CriteriaLastPhone(string searchCriteria)
        {
            this.searchCriteria = searchCriteria;
        }

        public List<Person> MeetCriteria(List<Person> persons)
        {
            List<Person> personsData = new List<Person>();
            foreach (var item in persons)
            {
                if (item.Phone.ToUpper().Equals(searchCriteria.ToUpper()))
                {
                    personsData.Add(item);
                }
            }

            return personsData;
        }
    }

   public class CriteriaEmail : ICriteria
    {
        private string searchCriteria;
        public CriteriaEmail(string searchCriteria)
        {
            this.searchCriteria = searchCriteria;
        }
        public List<Person> MeetCriteria(List<Person> persons)
        {
            List<Person> personsData = new List<Person>();
            foreach (var item in persons)
            {
                if (item.Email.ToUpper().Equals(searchCriteria.ToUpper()))
                {
                    personsData.Add(item);
                }
            }

            return personsData;
        }
    }


public class AndCriteria : ICriteria
{
    private ICriteria criteria;
    private ICriteria otherCriteria;

    public AndCriteria(ICriteria criteria, ICriteria otherCriteria)
    {
        this.criteria = criteria;
        this.otherCriteria = otherCriteria;
    }

    public List<Person> MeetCriteria(List<Person> persons)
    {
        List<Person> firstCriteriaPersons = criteria.MeetCriteria(persons);
        return otherCriteria.MeetCriteria(firstCriteriaPersons);
    }
}

public class OrCriteria : ICriteria
{
    private ICriteria criteria;
    private ICriteria otherCriteria;

    public OrCriteria(ICriteria criteria, ICriteria otherCriteria)
    {
        this.criteria = criteria;
        this.otherCriteria = otherCriteria;
    }

    public List<Person> MeetCriteria(List<Person> persons)
    {
        List<Person> firstCriteriaItems = criteria.MeetCriteria(persons);
        List<Person> otherCriteriaItems = otherCriteria.MeetCriteria(persons);

        foreach (var otherItems in otherCriteriaItems)
        {
            if (!firstCriteriaItems.Contains(otherItems))
            {
                firstCriteriaItems.Add(otherItems);
            }
        }

        return firstCriteriaItems;
    }

}
class Program
{
    static void Main(string[] args)
    {
        List<Person> persons = new List<Person>();

        persons.Add(new Person { FirstName = "Robert", LastName = "kerry", Phone = "1234", Email = "cddd@xyz.com"});
        persons.Add(new Person { FirstName = "Robert", LastName = "Sam", Phone = "1234", Email = "sam@xyz.com" });
        persons.Add(new Person { FirstName = "Jon", LastName = "Kam", Phone = "1234", Email = "john@xyz.com" });

        Console.WriteLine("---Search by First and Last Name----");
        ICriteria firstName = new CriteriaFirstName("Robert");
        ICriteria lastName = new CriteriaLastName("Kerry");
        ICriteria fullName = new AndCriteria(firstName, lastName);
        var searchedData = fullName.MeetCriteria(persons);

        //Search by First and last name (And criteria)
        foreach (var person in searchedData)
        {
            Console.WriteLine(person.FirstName);
            Console.WriteLine(person.LastName);
            Console.WriteLine(person.Phone);
        }

        //Search by first name and email. (And Criteria)
        firstName = new CriteriaFirstName("Robert");
        var email = new CriteriaEmail("sam@xyz.com");
        fullName = new AndCriteria(firstName, email);
        searchedData = fullName.MeetCriteria(persons);
        foreach (var person in searchedData)
        {
            Console.WriteLine(person.FirstName);
            Console.WriteLine(person.LastName);
            Console.WriteLine(person.Phone);
        }

        Console.WriteLine("---Search by First Name Only----");
        firstName = new CriteriaFirstName("Robert");
        searchedData = firstName.MeetCriteria(persons);
        foreach (var person in searchedData)
        {
            Console.WriteLine(person.FirstName);
            Console.WriteLine(person.LastName);
            Console.WriteLine(person.Phone);
        }

        Console.WriteLine("---Search by First Name or email ----");
        //Search by first name . (or Criteria)
        firstName = new CriteriaFirstName("Robert");
        email = new CriteriaEmail("john@xyz.com");
        fullName = new OrCriteria(firstName, email);
        searchedData = fullName.MeetCriteria(persons);
        foreach (var person in searchedData)
        {
            Console.WriteLine(person.FirstName);
            Console.WriteLine(person.LastName);
            Console.WriteLine(person.Phone);
        }

        Console.ReadKey();
    }
}
Implement Filter Design Pattern for generic cases (i.e. filter specific String attributes)

Implement Filter Design Pattern for generic cases (i.e. filter specific String attributes)


By : Martin
Date : October 31 2020, 05:01 AM
This might help you That design pattern is obsolete since the addition of the Stream API in Java 8. Criteria are now defined by the Predicate interface and executed by the filter method.
code :
public static void main(String... args) {
    Person john = new Person("John Doe", Gender.MALE, MaritalStatus.MARRIED);
    Person jane = new Person("Jane Doe", Gender.FEMALE, MaritalStatus.MARRIED);
    Person joe  = new Person("Joe Bloe", Gender.MALE, MaritalStatus.SINGLE);

    Set<Person> husbands = Stream.of(john, jane, joe)
            .filter(person -> person.gender == Gender.MALE)
            .filter(person -> person.maritalStatus == MaritalStatus.MARRIED)
            .collect(Collectors.toSet());
}

enum Gender {  MALE, FEMALE  }
enum MaritalStatus { MARRIED, SINGLE }
static class Person {
    final String name;
    final Gender gender;
    final MaritalStatus maritalStatus;

    Person(String name, Gender gender, MaritalStatus maritalStatus){
        this.name = name;
        this.gender = gender;
        this.maritalStatus = maritalStatus;
    }
}
How to filter out a certain pattern in filter pyspark RDD

How to filter out a certain pattern in filter pyspark RDD


By : user3627774
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Using PySpark RDD filter method, you just need to make sure at least one of login or auth is NOT in the string, in Python code:
code :
data.filter(lambda x: any(e not in x for e in ['login', 'auth']) ).collect()
Comparing pipe and filter pattern to builder pattern

Comparing pipe and filter pattern to builder pattern


By : Spence
Date : March 29 2020, 07:55 AM
wish helps you Pipes and Filters pattern is Enterprice integration pattern, while the Builder pattern is one of the object-oriented design pattern.
These two patterns have a different semantics:
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