GenericGroupObject/src/main/java/com/zipcodewilmington/generic/group/Group.java

package com.zipcodewilmington.generic.group;

import com.sun.javafx.tools.packager.Param;
import com.zipcodewilmington.generic.identifiables.IdentifiableInterface;

import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;

/**
 * @author leon on 06/12/2018.
 */
public class Group<TypeOfId extends Serializable,
        TypeOfEntity extends IdentifiableInterface<TypeOfId>> extends AbstractGroup<TypeOfId, TypeOfEntity> {

    public Group(){
         list = new ArrayList<>();
    }

    @Override
    public Integer count() {
        return list.size();
    }

    @Override
    public void insert(IdentifiableInterface object) {
        list.add((TypeOfEntity) object);
    }

    @Override
    public void delete(IdentifiableInterface object) {
        list.remove(object);
    }

    @Override
    public void delete(Serializable serializable) {
        list.removeIf(e -> e.getIdentity().equals(serializable));
    }

    @Override
    public Boolean has(IdentifiableInterface object) {
        return list.contains(object);
    }

    @Override
    public Boolean has(Serializable serializable) {
        for (IdentifiableInterface i : list)
            if (i.getIdentity().equals(serializable))
                return true;
        return false;
    }

    @Override
    public List filter(Predicate predicate) {
        return (List) list.stream().filter(predicate).collect(Collectors.toList());
    }

    @Override
    public Class<? extends TypeOfId> getIdentityType() {
        Class clazz = getClass(); //class com.zipcodewilmington.generic.group.Group
        Type type = clazz.getGenericSuperclass(); //com.zipcodewilmington.generic.group.AbstractGroup<TypeOfId, TypeOfEntity>
        ParameterizedType pt = (ParameterizedType) type; //com.zipcodewilmington.generic.group.AbstractGroup<TypeOfId, TypeOfEntity>
        Type[] types = pt.getActualTypeArguments(); //[Ljava.lang.reflect.Type;@6073f712
        Type type1 = types[0]; //TypeOfId
        return (Class) type1.getClass();
    }

    @Override
    public Class<? extends TypeOfEntity> getIdentifiableType() {
        Class clazz = getClass(); //class com.zipcodewilmington.generic.group.Group
        Type type = clazz.getGenericSuperclass(); //com.zipcodewilmington.generic.group.AbstractGroup<TypeOfId, TypeOfEntity>
        ParameterizedType pt = (ParameterizedType) type; //com.zipcodewilmington.generic.group.AbstractGroup<TypeOfId, TypeOfEntity>
        Type[] types = pt.getActualTypeArguments(); //[Ljava.lang.reflect.Type;@6073f712
        Type type1 = types[1]; //TypeOfEntity
        return (Class) type1.getClass();
    }

}