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Commit 2a7745e

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author
evitwilly
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added pattern Chain Of Responsibilities
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‎README.md‎

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* [Singleton](/src/main/kotlin/design_patterns/Singleton.kt)
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* [Strategy](/src/main/kotlin/design_patterns/Strategy.kt)
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* [Observer](/src/main/kotlin/design_patterns/Observer.kt)
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* [Dependency Injection](/src/main/kotlin/design_patterns/Dependency%20%20Injection.kt)
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* [Dependency Injection](/src/main/kotlin/design_patterns/Dependency%20Injection.kt)
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* [Adapter](/src/main/kotlin/design_patterns/Adapter.kt)
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* [Memento](/src/main/kotlin/design_patterns/Memento.kt)
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* [Chain Of Responsibilities](/src/main/kotlin/design_patterns/Chain%20Of%20Responsibilities.kt)
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2. package <code>structures</code> - data structure
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* [Binary tree](/src/main/kotlin/structures/BinaryTree.kt)

‎README_ru.md‎

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* [Singleton](/src/main/kotlin/design_patterns/Singleton.kt)
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* [Strategy](/src/main/kotlin/design_patterns/Strategy.kt)
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* [Observer](/src/main/kotlin/design_patterns/Observer.kt)
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* [Dependency Injection](/src/main/kotlin/design_patterns/Dependency%20%20Injection.kt)
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* [Dependency Injection](/src/main/kotlin/design_patterns/Dependency%20Injection.kt)
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* [Adapter](/src/main/kotlin/design_patterns/Adapter.kt)
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* [Memento](/src/main/kotlin/design_patterns/Memento.kt)
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* [Chain Of Responsibilities](/src/main/kotlin/design_patterns/Chain%20Of%20Responsibilities.kt)
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2. пакет <code>ru.structures</code> - структуры данных
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* [Бинарное дерево](/src/main/kotlin/structures/BinaryTree.kt)
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‎src/main/kotlin/design_patterns/Visitor.kt‎

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package design_patterns
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/**
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*
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* pattern: Visitor
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*
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* description: it's a behavioral pattern that allows you to add a new operation
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package design_patterns
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/**
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*
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* pattern: Chain of responsibility
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*
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* description: a design pattern consisting of "a source of command objects and a series of processing objects".
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* Each processing object in the chain is responsible for a certain type of command, and the processing is done,
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* it forwards the command to the next processor in the chain.
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*
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*/
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enum class BlockFactor {
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ONE, TWO, THREE
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}
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/**
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*
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* I decided to give an analogy from the Minecraft game.
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* In this game there are blocks that can be broken with a stone pickaxe, iron and diamond.
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* For example: diamond may mine by iron and diamond pickaxes unlike cobblestone, which is mined by any
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*
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*/
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abstract class Block(private val factor: BlockFactor) {
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fun mayMine(factor: BlockFactor) = this.factor.ordinal <= factor.ordinal
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}
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/**
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*
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* blocks from the game
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*
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*/
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class StoneBlock: Block(BlockFactor.ONE)
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class DiamondBlock: Block(BlockFactor.TWO)
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class ObsidianBlock: Block(BlockFactor.THREE)
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abstract class Pickaxe(private val factor: BlockFactor) {
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private var nextPickaxe: Pickaxe? = null
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fun changeNextPickaxe(pickaxe: Pickaxe) {
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this.nextPickaxe = pickaxe
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}
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/**
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*
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* we mine the block, if it doesn't work, we take another pickaxe, if there is one
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*
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* @return return true if a pickaxe can mine
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*/
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fun mine(block: Block): Boolean =
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if (block.mayMine(factor)) {
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true
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} else {
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nextPickaxe?.mine(block) ?: false
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}
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}
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/**
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*
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* pickaxes from the game
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*
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*/
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class StonePickaxe: Pickaxe(BlockFactor.ONE)
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class IronPickaxe: Pickaxe(BlockFactor.TWO)
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class DiamondPickaxe: Pickaxe(BlockFactor.THREE)

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