Class PriceChangedEvent

java.lang.Object
com.university.bookstore.observer.PriceChangedEvent
All Implemented Interfaces:
MaterialEvent
public class PriceChangedEvent extends Object implements MaterialEvent
Event that occurs when a material's price changes.
Since:
2024-09-15
Version:
3.0
Author:
Navid Mohaghegh

  • Constructor Details

    • PriceChangedEvent

      public PriceChangedEvent(Material material, double oldPrice, double newPrice)
      Creates a new price changed event.
      Parameters:
      material - the material whose price changed
      oldPrice - the previous price
      newPrice - the new price
      Throws:
      IllegalArgumentException - if material is null or prices are negative

  • Method Details

    • getMaterial

      public Material getMaterial()
      Description copied from interface: MaterialEvent
      Gets the material associated with this event.
      Specified by:
      getMaterial in interface MaterialEvent
      Returns:
      the material

    • getTimestamp

      public long getTimestamp()
      Description copied from interface: MaterialEvent
      Gets the timestamp when this event occurred.
      Specified by:
      getTimestamp in interface MaterialEvent
      Returns:
      the event timestamp in milliseconds

    • getEventType

      public String getEventType()
      Description copied from interface: MaterialEvent
      Gets the type of this event.
      Specified by:
      getEventType in interface MaterialEvent
      Returns:
      the event type

    • getDescription

      public String getDescription()
      Description copied from interface: MaterialEvent
      Gets a description of this event.
      Specified by:
      getDescription in interface MaterialEvent
      Returns:
      the event description

    • getOldPrice

      public double getOldPrice()
      Gets the old price.
      Returns:
      the previous price

    • getNewPrice

      public double getNewPrice()
      Gets the new price.
      Returns:
      the new price

    • getPriceChange

      public double getPriceChange()
      Gets the price change amount.
      Returns:
      the price change (new - old)

    • getPriceChangePercentage

      public double getPriceChangePercentage()
      Gets the price change percentage.
      Returns:
      the price change percentage

    • isPriceIncrease

      public boolean isPriceIncrease()
      Checks if the price increased.
      Returns:
      true if the price increased

    • isPriceDecrease

      public boolean isPriceDecrease()
      Checks if the price decreased.
      Returns:
      true if the price decreased

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object