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java sprint 6 v1.0 #1
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81 changes: 72 additions & 9 deletions
81
src/ru/yandex/javacource/golotin/schedule/service/InMemoryHistoryManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,28 +1,91 @@ | ||
| package ru.yandex.javacource.golotin.schedule.service; | ||
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| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import ru.yandex.javacource.golotin.schedule.model.Task; | ||
| import ru.yandex.javacource.golotin.schedule.service.HistoryManager; | ||
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| public class InMemoryHistoryManager implements HistoryManager { | ||
| private static final int HISTOY_MAX_SIZE = 10; | ||
| private final List<Task> history = new ArrayList<>(); | ||
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| private static class Node { | ||
| Task item; | ||
| Node next; | ||
| Node prev; | ||
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| Node(Node prev, Task element, Node next) {// присвоение prev, element, next | ||
| this.item = element; | ||
| this.next = next; | ||
| this.prev = prev; | ||
| } | ||
| } | ||
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| private static final Map<Integer, Node> history = new HashMap<>(); | ||
| private Node first; | ||
| private Node last; | ||
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| @Override | ||
| public void add(Task task) { | ||
| public void add(Task task) {// добавление Task | ||
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| if (task == null) { | ||
| return; | ||
| }else { | ||
| remove(task.getId()); | ||
| linkLast(task); | ||
| history.put(task.getId(), last); | ||
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| } | ||
| if (history.size() >= HISTOY_MAX_SIZE) { | ||
| history.remove(0); | ||
| } | ||
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| @Override | ||
| public List<Task> getAll() {// вывод списка истории | ||
| List<Task> list = new ArrayList<>(); | ||
| Node current = first; | ||
| while (current != null) { | ||
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| current = current.next; | ||
| } | ||
| history.add(task); | ||
| return list; | ||
| } | ||
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| @Override | ||
| public List<Task> getHistory() { | ||
| return history; | ||
| public void remove(int id) {// удаление по id | ||
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|
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| final Node node = history.remove(id); | ||
| if (node == null) { | ||
| return; | ||
| } | ||
| removeNode(node); | ||
| } | ||
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| private void removeNode(Node node) { | ||
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| if (node.prev != null) { | ||
| node.prev.next = node.next; | ||
| if (node.next == null) { | ||
| last = node.prev; | ||
| } else { | ||
| node.next.prev = node.prev; | ||
| } | ||
| } else { | ||
| first = node.next; | ||
| if (first == null) { | ||
| last = null; | ||
| } else { | ||
| first.prev = null; | ||
| } | ||
| } | ||
| } | ||
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| private void linkLast(Task task) {// двигаем историю | ||
| final Node lastLink = last; | ||
| final Node newNode = new Node(lastLink, task, null); | ||
| last = newNode; | ||
| if (lastLink == null) { | ||
| first = newNode; | ||
| } else { | ||
| lastLink.next = newNode; | ||
| } | ||
| } | ||
| } | ||
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