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A Java persistence layer based on JOOQ for high performance and business flow support.

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package com.kenshoo.pl.entity;

import java.util.List;

/**
 * The final state of an entity in the database.
 * This will be the state of the entity after all changes have been applied on the current state and contains the final values of the entity's fields.
 *
 */

public class FinalEntityState implements Entity {

    private final CurrentEntityState currentState;
    private final EntityChange> change;

    public static FinalEntityState merge(CurrentEntityState currentEntityState, EntityChange> entityChange) {
        return new FinalEntityState(currentEntityState, entityChange);
    }

    private FinalEntityState(CurrentEntityState currentState, EntityChange> change) {
        this.currentState = currentState;
        this.change = change;
    }

    @Override
    public boolean containsField(EntityField field) {
        return change.containsField((EntityField)field) || currentState.containsField(field);
    }

    @Override
    public  T get(EntityField field) {
        return field.getEntityType() == change.getEntityType() && change.containsField((EntityField)field)
                ? (T)change.get((EntityField)field)
                : currentState.get(field);
    }

    @Override
    public > List> getMany(CHILD type) {
        throw new UnsupportedOperationException("Final state of children is unknown at this point");
    }

}