001package scpc.model;
002
003import java.io.Serializable;
004import java.util.Objects;
005import scpc.Calculator;
006
007/**
008 * 購物車內的單一物品<br>
009 * Present a single item of shopping cart.
010 *
011 * @author Kent Yeh
012 * @param <T> type of real cart item.
013 */
014public class SingleItem<T> implements IItem<T> {
015
016    private final IItem<T> item;
017    private final int sequenceNum;
018    private boolean serialLast = false;
019    private boolean exclusiveLock = false;
020
021    public SingleItem(IItem<T> item, int sequenceNum) {
022        this.item = item;
023        this.sequenceNum = sequenceNum;
024    }
025
026    /**
027     * @see IItem#getIdentity()
028     * @return
029     */
030    @Override
031    public Serializable getIdentity() {
032        return item.getIdentity();
033    }
034
035    /**
036     * @see IItem#as()
037     * @return
038     */
039    @Override
040    public T as() {
041        return item.as();
042    }
043
044    /**
045     * @see IItem#getQuantity()
046     * @return
047     */
048    @Override
049    public long getQuantity() {
050        return 1;
051    }
052
053    /**
054     * @see IItem#setQuantity(long)
055     * @param quantity
056     */
057    @Override
058    public void setQuantity(long quantity) {
059
060    }
061
062    /**
063     * @see IItem#getSalePrice()
064     * @return
065     */
066    @Override
067    public double getSalePrice() {
068        return item.getSalePrice();
069    }
070
071    /**
072     * @see IItem#getOriginalPrice()
073     * @return
074     */
075    @Override
076    public double getOriginalPrice() {
077        return item.getOriginalPrice();
078    }
079
080    /**
081     * 購物車裡的物品<br>
082     *
083     * @return a Shopping cart item.
084     */
085    public IItem<T> getItem() {
086        return item;
087    }
088
089    /**
090     * 排序編號
091     *
092     * @return ordered sequence number of item.
093     */
094    public int getSequenceNum() {
095        return sequenceNum;
096    }
097
098    /**
099     * 是否為同品項物品的最後一項
100     *
101     * @return the last item of same serial items.
102     */
103    public boolean isSerialLast() {
104        return serialLast;
105    }
106
107    /**
108     * Detect whether the current visit item is the last item of the same series
109     * or not.
110     * <br>當下走访品項是否為同系列中的最後一個
111     *
112     * @param serialLast
113     */
114    public void setSerialLast(boolean serialLast) {
115        this.serialLast = serialLast;
116    }
117
118    /**
119     * for {@link Calculator} use only.
120     *
121     * @return
122     */
123    public boolean isExclusiveLock() {
124        return exclusiveLock;
125    }
126
127    /**
128     * for {@link Calculator} use only.
129     *
130     * @param exclusiveLock
131     * @return
132     */
133    public SingleItem<T> setExclusiveLock(boolean exclusiveLock) {
134        this.exclusiveLock = exclusiveLock;
135        return this;
136    }
137
138    @Override
139    public int hashCode() {
140        int hash = 7;
141        hash = 73 * hash + this.sequenceNum;
142        return hash;
143    }
144
145    @Override
146    public boolean equals(Object obj) {
147        if (obj == null) {
148            return false;
149        }
150        if (getClass() != obj.getClass()) {
151            return false;
152        }
153        final SingleItem<?> other = (SingleItem<?>) obj;
154        if (!Objects.equals(this.item, other.item)) {
155            return false;
156        }
157        return this.sequenceNum == other.sequenceNum;
158    }
159
160    @Override
161    public String toString() {
162        return "singularize \"" + sequenceNum + "." + item.toString() + "\"";
163    }
164
165}