myhw2.data

Class InventorySet

java.lang.Object

myhw2.data.InventorySet

All Implemented Interfaces:

java.lang.Iterable<Record>, Inventory

final class InventorySet
extends java.lang.Object
implements Inventory

Implementation of Inventory interface.

See Also:

Data

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	InventorySet.RecordObj Implementation of Record interface.

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map<Video,Record>	data

Constructor Summary

Constructors

Constructor and Description
InventorySet()

Method Summary

Modifier and Type	Method and Description
(package private) void	addNumOwned(Video video, int change) Add or remove copies of a video from the inventory.
(package private) void	checkIn(Video video) Check in a video.
(package private) void	checkOut(Video video) Check out a video.
(package private) void	clear() Remove all records from the inventory.
Record	get(Video v) Return the record for a given Video; if not present, return null.
java.util.Iterator<Record>	iterator() Return an iterator over Records in the Inventory.
java.util.Iterator<Record>	iterator(java.util.Comparator<Record> comparator) Return an iterator over the Inventory, sorted accoring the Comparator.
int	size() Return the number of Records.
java.lang.String	toString() Returns the inventory as a string; one record per line.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

data

private final java.util.Map<Video,Record> data

Constructor Detail

InventorySet

InventorySet()

Method Detail

size

public int size()

Description copied from interface: Inventory

Return the number of Records.

Specified by:

size in interface Inventory

get

public Record get(Video v)

Description copied from interface: Inventory

Return the record for a given Video; if not present, return null.

Specified by:

get in interface Inventory

iterator

public java.util.Iterator<Record> iterator()

Description copied from interface: Inventory

Return an iterator over Records in the Inventory.

The iterator returns objects that implement the Record interface.

Any attempt to remove objects using the iterator should result in an UnsupportedOperationException.

The Record order is unspecified

Specified by:

iterator in interface java.lang.Iterable<Record>

Specified by:

iterator in interface Inventory

iterator

public java.util.Iterator<Record> iterator(java.util.Comparator<Record> comparator)

Description copied from interface: Inventory

Return an iterator over the Inventory, sorted accoring the Comparator.

The iterator returns objects that implement the Record interface.

Any attempt to remove objects using the iterator should result in an UnsupportedOperationException.

The iteration order is determined by the comparator (least first).

The comparator may assume that its arguments implement Record.

Specified by:

iterator in interface Inventory

Parameters:

comparator - determines the order of the records returned.

addNumOwned

void addNumOwned(Video video,
                 int change)

Add or remove copies of a video from the inventory. If a video record is not already present (and change is positive), a record is created. If a record is already present, numOwned is modified using change. If change brings the number of copies to be zero, the record is removed from the inventory.

Parameters:

video - the video to be added.

change - the number of copies to add (or remove if negative).

Throws:

java.lang.IllegalArgumentException - if video null, change is zero, if attempting to remove more copies than are owned, or if attempting to remove copies that are checked out.

checkOut

void checkOut(Video video)

Check out a video.

Parameters:

video - the video to be checked out.

Throws:

java.lang.IllegalArgumentException - if video has no record or numOut equals numOwned.

checkIn

void checkIn(Video video)

Check in a video.

Parameters:

video - the video to be checked in.

Throws:

java.lang.IllegalArgumentException - if video has no record or numOut non-positive.

clear

void clear()

Remove all records from the inventory.

toString

public java.lang.String toString()

Description copied from interface: Inventory

Returns the inventory as a string; one record per line.

Specified by:

toString in interface Inventory

Overrides:

toString in class java.lang.Object