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1 /*
2  * Copyright (C) 2016 Roland Haeder
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17 package org.mxchange.jshopcore.model.basket;
18
19 import java.io.Serializable;
20 import java.util.List;
21 import org.mxchange.jshopcore.exceptions.BasketItemAlreadyAddedException;
22
23 /**
24  * An interface for baskets
25  * <p>
26  * @author Roland Haeder<roland@mxchange.org>
27  * @param <T> Any addable basket items
28  */
29 public interface Basket<T extends AddableBasketItem> extends Serializable {
30
31         /**
32          * Adds given item instance to this basket
33          * <p>
34          * @param item Item instance to add
35          * <p>
36          * @throws org.mxchange.jshopcore.exceptions.BasketItemAlreadyAddedException
37          *                                                                           If
38          *                                                                           the
39          *                                                                           item
40          *                                                                           instance
41          *                                                                           has
42          *                                                                           already
43          *                                                                           been
44          *                                                                           added
45          */
46         void addItem (final T item) throws BasketItemAlreadyAddedException;
47
48         /**
49          * Clears the basket instance
50          */
51         void clear ();
52
53         /**
54          * Some "getter" for all entries in this basket
55          * <p>
56          * @return Map on all basket items
57          */
58         List<T> getAll ();
59
60         /**
61          * Getter for last entry
62          * <p>
63          * @return Last added item in basket
64          */
65         T getLast ();
66
67         /**
68          * Getter for basket size
69          * <p>
70          * @return Basket size
71          */
72         int size ();
73
74         /**
75          * Checks whether the given item has already been added by checking the
76          * item's id.
77          * <p>
78          * @param item Item instance to check
79          * <p>
80          * @return Whether the given item has been found
81          */
82         boolean isAdded (final T item);
83
84         /**
85          * Checks if the basket is empty
86          * <p>
87          * @return Whether the basket is empty
88          */
89         boolean isEmpty ();
90
91         @Override
92         boolean equals (final Object object);
93
94         @Override
95         int hashCode ();
96
97 }