Class EBook

java.lang.Object

com.university.bookstore.model.Material

com.university.bookstore.model.EBook

All Implemented Interfaces:

Media, Comparable<Material>

public class EBook
extends Material
implements Media

Represents an electronic book (e-book) in the bookstore system. Extends Material and implements Media interface to demonstrate multiple inheritance through interfaces.

EBooks support various file formats, DRM protection, and provide reading time estimation based on word count.

Since:

2024-09-15

Version:

2.0

Author:

Navid Mohaghegh

Nested Class Summary

Nested classes/interfaces inherited from class com.university.bookstore.model.Material

Material.MaterialType

Nested classes/interfaces inherited from interface com.university.bookstore.model.Media

Media.MediaQuality

Constructor Summary

Constructors

Constructor	Description
EBook(String id, String title, String author, double price, int year, String fileFormat, double fileSize, boolean drmEnabled, int wordCount, Media.MediaQuality quality)	Constructs a new EBook with validation.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Materials are equal if they have the same ID.
String	getAuthor()	Gets the author of the e-book.
String	getCreator()	Abstract method to get the creator/author/artist of the material.
String	getDescription()
double	getDiscountRate()	Hook method for discount rate.
String	getDisplayInfo()	Abstract method to get a formatted display string.
int	getDuration()	Gets the duration of the media in minutes.
String	getFileFormat()	Gets the file format of the ebook.
double	getFileSize()	Gets the file size in MB.
String	getFormat()	Gets the file format of the media.
Media.MediaQuality	getQuality()	Gets the quality setting for the media.
int	getReadingTimeMinutes()	Calculates estimated reading time in minutes based on average reading speed.
int	getWordCount()	Gets the word count of the book.
int	hashCode()
boolean	isDrmEnabled()	Checks if DRM is enabled.
boolean	isStreamingOnly()	Checks if the media requires an internet connection.
String	toString()

Methods inherited from class com.university.bookstore.model.Material

compareTo, getDiscountedPrice, getId, getPrice, getTitle, getType, getYear

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.university.bookstore.model.Media

estimateDownloadTime, getPlaybackInfo

Constructor Details

EBook

public EBook(String id,
 String title,
 String author,
 double price,
 int year,
 String fileFormat,
 double fileSize,
 boolean drmEnabled,
 int wordCount,
 Media.MediaQuality quality)

Constructs a new EBook with validation.

Parameters:

id - unique identifier

title - the book title

author - the author name

price - the price in dollars

year - the publication year

fileFormat - the file format (PDF, EPUB, or MOBI)

fileSize - the file size in MB

drmEnabled - whether DRM is enabled

wordCount - the number of words in the book

quality - the media quality

Throws:

IllegalArgumentException - if validation fails

Method Details

getCreator

public String getCreator()

Description copied from class: Material

Abstract method to get the creator/author/artist of the material. Implementation varies by material type.

Specified by:

getCreator in class Material

Returns:

the creator's name

getAuthor

public String getAuthor()

Gets the author of the e-book.

Returns:

the author

getDisplayInfo

public String getDisplayInfo()

Description copied from class: Material

Abstract method to get a formatted display string. Each material type should provide its own formatting.

Specified by:

getDisplayInfo in class Material

Returns:

formatted display string

getDiscountRate

public double getDiscountRate()

Description copied from class: Material

Hook method for discount rate. Default is no discount. Subclasses can override to provide type-specific discounts.

Overrides:

getDiscountRate in class Material

Returns:

discount rate between 0.0 and 1.0

getReadingTimeMinutes

public int getReadingTimeMinutes()

Calculates estimated reading time in minutes based on average reading speed.

Returns:

estimated reading time in minutes

getFileFormat

public String getFileFormat()

Gets the file format of the ebook.

Returns:

the file format

getFileSize

public double getFileSize()

Gets the file size in MB.

Specified by:

getFileSize in interface Media

Returns:

the file size

isDrmEnabled

public boolean isDrmEnabled()

Checks if DRM is enabled.

Returns:

true if DRM is enabled

getWordCount

public int getWordCount()

Gets the word count of the book.

Returns:

the word count

getQuality

public Media.MediaQuality getQuality()

Description copied from interface: Media

Gets the quality setting for the media.

Specified by:

getQuality in interface Media

Returns:

quality descriptor

getDescription

public String getDescription()

getDuration

public int getDuration()

Description copied from interface: Media

Gets the duration of the media in minutes.

Specified by:

getDuration in interface Media

Returns:

duration in minutes

getFormat

public String getFormat()

Description copied from interface: Media

Gets the file format of the media.

Specified by:

getFormat in interface Media

Returns:

format string (e.g., "MP3", "MP4", "WAV")

isStreamingOnly

public boolean isStreamingOnly()

Description copied from interface: Media

Checks if the media requires an internet connection.

Specified by:

isStreamingOnly in interface Media

Returns:

true if streaming required, false if downloadable

equals

public boolean equals(Object obj)

Description copied from class: Material

Materials are equal if they have the same ID.

Overrides:

equals in class Material

hashCode

public int hashCode()

Overrides:

hashCode in class Material

toString

public String toString()

Overrides:

toString in class Material