Class MaterialDecorator

java.lang.Object
com.university.bookstore.model.Material
com.university.bookstore.decorator.MaterialDecorator
All Implemented Interfaces:
Comparable<Material>
Direct Known Subclasses:
DigitalAnnotationDecorator, ExpeditedDeliveryDecorator, GiftWrappingDecorator
public abstract class MaterialDecorator extends Material
Abstract base class for material decorators in the Decorator pattern. Provides a common interface for decorating materials with additional features.

This class implements the Material interface and delegates all operations to the wrapped material, allowing subclasses to override specific methods to add new functionality without modifying the original material classes.

Since:
2024-09-15
Version:
3.0
Author:
Navid Mohaghegh

  • Constructor Details

    • MaterialDecorator

      public MaterialDecorator(Material material)
      Creates a new material decorator wrapping the specified material.
      Parameters:
      material - the material to decorate
      Throws:
      IllegalArgumentException - if material is null

  • 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

    • 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

    • getDecoratedMaterial

      public Material getDecoratedMaterial()
      Gets the decorated material.
      Returns:
      the wrapped material

    • getBaseMaterial

      public Material getBaseMaterial()
      Gets the base material (unwraps all decorators).
      Returns:
      the original material without any decorations

    • getDecoratorCount

      public int getDecoratorCount()
      Gets the number of decorators applied to this material.
      Returns:
      the decorator count

    • hasDecorators

      public boolean hasDecorators()
      Checks if this material has any decorators applied.
      Returns:
      true if decorators are applied

    • 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