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+1
+00:00:00,460 --> 00:00:03,276
+>> And before we get started actually, I'd like to mention that there's
+
+2
+00:00:03,276 --> 00:00:05,124
+just, you know, FYI, there's different kinds
+
+3
+00:00:05,124 --> 00:00:06,708
+of verbs because what I'm looking for
+
+4
+00:00:06,708 --> 00:00:10,099
+is really action verbs. So verb, verbs that clearly express an action that
+
+5
+00:00:10,099 --> 00:00:13,580
+can tell me that, you know, what, for example, an item could do, 'kay?
+
+6
+00:00:13,580 --> 00:00:13,820
+>> Okay?
+
+7
+00:00:13,820 --> 00:00:16,620
+>> Not the verbs that represent, for example, relationships, 'kay?
+
+8
+00:00:16,620 --> 00:00:17,076
+>> Okay.
+
+9
+00:00:17,076 --> 00:00:19,080
+>> So, and the, there, and the ones
+
+10
+00:00:19,080 --> 00:00:22,020
+that I've identified und, underlined here actually, I,
+
+11
+00:00:22,020 --> 00:00:26,158
+I underlined complete sentences so that you kind of we can look at the verbs in
+
+12
+00:00:26,158 --> 00:00:29,150
+in context. And the first one is this
+
+13
+00:00:29,150 --> 00:00:30,850
+sentence that says that the library may need
+
+14
+00:00:30,850 --> 00:00:33,190
+to know or to calculate the items a
+
+15
+00:00:33,190 --> 00:00:35,790
+patron has checked out, when they are due, and
+
+16
+00:00:35,790 --> 00:00:38,860
+any outstanding overdue fines. So I, I will
+
+17
+00:00:38,860 --> 00:00:41,430
+imagine that this is representing a situation in
+
+18
+00:00:41,430 --> 00:00:44,224
+which you bring up a patron's record and
+
+19
+00:00:44,224 --> 00:00:46,131
+you start looking up this information. Is that [CROSSTALK]
+
+20
+00:00:46,131 --> 00:00:50,970
+>> The, the patron often wants to know what they have currently checked out.
+
+21
+00:00:50,970 --> 00:00:51,044
+>> Oh,
+
+22
+00:00:51,044 --> 00:00:51,282
+alright.
+
+23
+00:00:51,282 --> 00:00:53,260
+>> Or when are their due or how much they're owed or.
+
+24
+00:00:53,260 --> 00:00:55,100
+>> Oh, in fact, and then now that you mentioned it,
+
+25
+00:00:55,100 --> 00:00:57,500
+I think you sent me. One of the scenarios you sent
+
+26
+00:00:57,500 --> 00:00:59,400
+me had to do with that, right, with the patron coming
+
+27
+00:00:59,400 --> 00:01:01,930
+in and asking for this information. So yeah, and it makes
+
+28
+00:01:01,930 --> 00:01:05,025
+a lot of sense. So what I'm going to do, I'm going to
+
+29
+00:01:05,025 --> 00:01:10,520
+model this by adding this three operations to the patron method.
+
+30
+00:01:10,520 --> 00:01:13,410
+The first one, I'm going to call, itemsCheckedOut and, basically, it's an
+
+31
+00:01:13,410 --> 00:01:16,520
+operation, but you don't need to, you know, understand the implementation
+
+32
+00:01:16,520 --> 00:01:18,820
+details, but when you call this operation, it will
+
+33
+00:01:18,820 --> 00:01:21,770
+give you back exactly this information, so the items
+
+34
+00:01:21,770 --> 00:01:23,864
+that are checked out by that patron. The second
+
+35
+00:01:23,864 --> 00:01:25,965
+one, I'm going to call it whenDue. That will tell you
+
+36
+00:01:25,965 --> 00:01:29,080
+basically when a, when an item is due. And
+
+37
+00:01:29,080 --> 00:01:32,550
+the third one is going to be called the outstandingOverdueFines and,
+
+38
+00:01:32,550 --> 00:01:34,510
+you know, as the name says, it's going to tell
+
+39
+00:01:34,510 --> 00:01:36,860
+you what are the outstanding overdue fines for that patron.
+
+40
+00:01:36,860 --> 00:01:37,300
+>> Okay.
+
+41
+00:01:37,300 --> 00:01:39,306
+>> And as you might notice I mean,
+
+42
+00:01:39,306 --> 00:01:41,843
+I, I'm going to separate the, the, the attributes
+
+43
+00:01:41,843 --> 00:01:44,085
+from the operations by having a separate kind
+
+44
+00:01:44,085 --> 00:01:46,386
+of subrectangle so, in this way, it's clear
+
+45
+00:01:46,386 --> 00:01:48,274
+what is attribute and what is, what is
+
+46
+00:01:48,274 --> 00:01:51,000
+an attribute and what's an, what's an operation.
+
+47
+00:01:51,000 --> 00:01:51,420
+>> Gotcha.
+
+48
+00:01:51,420 --> 00:01:57,540
+>> And let me see then. Okay, for the
+
+49
+00:01:57,540 --> 00:02:00,040
+second one you can see that that patron can check
+
+50
+00:02:00,040 --> 00:02:02,990
+out books and audio visual materials. So I guess,
+
+51
+00:02:02,990 --> 00:02:06,880
+similarly you, you build kind of the record for a patron.
+
+52
+00:02:06,880 --> 00:02:09,150
+The patron will give you an item and you will record
+
+53
+00:02:09,150 --> 00:02:11,020
+the fact that the patron is kind of checking it out.
+
+54
+00:02:11,020 --> 00:02:15,730
+>> Right. And is that operation related to this,
+
+55
+00:02:15,730 --> 00:02:18,150
+the checked out attribute that we did a minute ago?
+
+56
+00:02:18,150 --> 00:02:21,495
+>> It is actually because what will happen then again, you know, if we jump
+
+57
+00:02:21,495 --> 00:02:24,975
+ahead a little bit would be that every time you invoke this operation. So I'm
+
+58
+00:02:24,975 --> 00:02:26,810
+going to represent this as a checkOut operation
+
+59
+00:02:26,810 --> 00:02:28,896
+for the patron. Every time you invoke this,
+
+60
+00:02:28,896 --> 00:02:31,920
+you will also have to say something about the item and so we will also
+
+61
+00:02:31,920 --> 00:02:35,700
+flip kind of that that, that build information in the, in the, in the item.
+
+62
+00:02:35,700 --> 00:02:36,904
+>> Okay.
+
+63
+00:02:36,904 --> 00:02:39,680
+>> Mm, 'kay? And, and finally, here, I can see that
+
+64
+00:02:39,680 --> 00:02:42,660
+a patron can request a book or an audio video item Is
+
+65
+00:02:42,660 --> 00:02:46,240
+not currently in. So I guess this is referring to items that
+
+66
+00:02:46,240 --> 00:02:48,980
+are already checked out but for which there is interest. Is that?
+
+67
+00:02:48,980 --> 00:02:54,770
+>> Right. So, particularly, the popular items the patrons want to get on
+
+68
+00:02:54,770 --> 00:02:57,140
+the list so that they get notified when it comes back in and.
+
+69
+00:02:57,140 --> 00:02:57,204
+>> Oh.
+
+70
+00:02:57,204 --> 00:02:57,730
+>> And check it out.
+
+71
+00:02:57,730 --> 00:03:00,570
+>> I see. I see. Okay. Then I'm going to do
+
+72
+00:03:00,570 --> 00:03:04,400
+the same thing here. I'm, I'm going to add this method,
+
+73
+00:03:04,400 --> 00:03:08,510
+which I'm going to call request and I'm going to put it
+
+74
+00:03:08,510 --> 00:03:11,340
+here in the list of the methods in the list.
+
+75
+00:03:11,340 --> 00:03:11,450
+>> Okay.
+
+76
+00:03:11,450 --> 00:03:12,810
+>> Of operations for the, for the patron, okay?
+