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| Filter or Criteria Design Pattern – Implementation - Class Diagram |
Person.java
public class Person
{
private String name;
private String gender;
private String maritalStatus;
public Person( String name, String gender, String maritalStatus )
{
this.name = name;
this.gender = gender;
this.maritalStatus = maritalStatus;
}
public String getName()
{
return name;
}
public String getGender()
{
return gender;
}
public String getMaritalStatus()
{
return maritalStatus;
}
}
Criteria.java
import java.util.List;
public interface Criteria
{
public List<Person> meetCriteria(List<Person> persons);
}
MaleCriteria.java
import java.util.ArrayList;
import java.util.List;
public class MaleCriteria implements Criteria
{
// Return the List of Persons who are male
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> malePersons = new ArrayList<Person>();
for( Person person : persons )
{
if( person.getGender().equalsIgnoreCase("male") )
{
malePersons.add(person);
}
}
return malePersons;
}
}
FemaleCriteria.java
import java.util.ArrayList;
import java.util.List;
public class FemaleCriteria implements Criteria
{
// Return the List of Persons who are female
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> femalePersons = new ArrayList<Person>();
for( Person person : persons )
{
if( person.getGender().equalsIgnoreCase("female") )
{
femalePersons.add(person);
}
}
return femalePersons;
}
}
MarriedCriteria.java
import java.util.ArrayList;
import java.util.List;
public class MarriedCriteria implements Criteria
{
// Return the List of Persons who are Married
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> marriedPersons = new ArrayList<Person>();
for( Person person : persons )
{
if( person.getMaritalStatus().equalsIgnoreCase("Married") )
{
marriedPersons.add(person);
}
}
return marriedPersons;
}
}
NotMarriedCriteria.java
import java.util.ArrayList;
import java.util.List;
public class NotMarriedCriteria implements Criteria
{
// Return the List of Persons who are not Married
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> notMarriedPersons = new ArrayList<Person>();
for( Person person : persons )
{
if( person.getMaritalStatus().equalsIgnoreCase("notMarried") )
{
notMarriedPersons.add(person);
}
}
return notMarriedPersons;
}
}
CriteriaOrCondition.java
import java.util.List;
public class CriteriaOrCondition implements Criteria
{
private Criteria criteria; /* male or female or married or notMarried Criteria */
private Criteria otherCriteria; /* male or female or married or notMarried Criteria */
public CriteriaOrCondition( Criteria criteria, Criteria otherCriteria )
{
this.criteria = criteria;
this.otherCriteria = otherCriteria;
}
// This will perform OR operation of two Criteria results
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> firstCriteriaItems = criteria.meetCriteria(persons);
List<Person> otherCriteriaItems = otherCriteria.meetCriteria(persons);
for( Person person : otherCriteriaItems )
{
if( !firstCriteriaItems.contains(person) )
{
firstCriteriaItems.add(person);
}
}
return firstCriteriaItems;
}
}
CriteriaAndCondition.java
import java.util.List;
public class CriteriaAndCondition implements Criteria
{
private Criteria criteria; /* male or female or married or notMarried Criteria */
private Criteria otherCriteria; /* male or female or married or notMarried Criteria */
public CriteriaAndCondition( Criteria criteria, Criteria otherCriteria )
{
this.criteria = criteria;
this.otherCriteria = otherCriteria;
}
// This will perform AND operation of two Criteria results
@Override
public List<Person> meetCriteria( List<Person> persons )
{
List<Person> firstCriteriaPersons = criteria.meetCriteria(persons);
return otherCriteria.meetCriteria(firstCriteriaPersons);
}
}
CriteriaPatternDemo.java
public class CriteriaPatternDemo
{
public static void main(String[] args)
{
List<Person> persons = new ArrayList<Person>();
persons.add(new Person("Robert", "Male", "NotMarried"));
persons.add(new Person("John", "Male", "Married"));
persons.add(new Person("Mike", "Male", "NotMarried"));
persons.add(new Person("Bobby", "Male", "NotMarried"));
persons.add(new Person("Laura", "Female", "Married"));
persons.add(new Person("Diana", "Female", "NotMarried"));
printPersons(persons);
System.out.println("---------------------------------------------------------------------");
Criteria male = new MaleCriteria();
System.out.println("Males: ");
printPersons(male.meetCriteria(persons));
Criteria female = new FemaleCriteria();
System.out.println("\nFemales: ");
printPersons(female.meetCriteria(persons));
Criteria notMarried = new NotMarriedCriteria();
System.out.println("\nNotMarried: ");
printPersons(notMarried.meetCriteria(persons));
Criteria married = new MarriedCriteria();
System.out.println("\nMarried: ");
printPersons(married.meetCriteria(persons));
Criteria marriedMale = new CriteriaAndCondition(married, male);
System.out.println("\nMarried and Male: ");
printPersons(marriedMale.meetCriteria(persons));
Criteria notMarriedOrFemale = new CriteriaOrCondition(notMarried, female);
System.out.println("\nNotMarried Or Female");
printPersons(notMarriedOrFemale.meetCriteria(persons));
}
public static void printPersons(List<Person> persons)
{
for (Person person : persons)
{
System.out.println("Person : [ Name : " + person.getName() + ", Gender : " + person.getGender() + ", Marital Status : " + person.getMaritalStatus() + " ]");
}
}
}
Output
Person : [ Name : Robert, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : John, Gender : Male, Marital Status : Married ]
Person : [ Name : Mike, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Bobby, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
Person : [ Name : Diana, Gender : Female, Marital Status : NotMarried ]
---------------------------------------------------------------------
Males:
Person : [ Name : Robert, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : John, Gender : Male, Marital Status : Married ]
Person : [ Name : Mike, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Bobby, Gender : Male, Marital Status : NotMarried ]
Females:
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
Person : [ Name : Diana, Gender : Female, Marital Status : NotMarried ]
NotMarried:
Person : [ Name : Robert, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Mike, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Bobby, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Diana, Gender : Female, Marital Status : NotMarried ]
Married:
Person : [ Name : John, Gender : Male, Marital Status : Married ]
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
Married and Male:
Person : [ Name : John, Gender : Male, Marital Status : Married ]
NotMarried Or Female
Person : [ Name : Robert, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Mike, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Bobby, Gender : Male, Marital Status : NotMarried ]
Person : [ Name : Diana, Gender : Female, Marital Status : NotMarried ]
Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
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