76 lines
2.0 KiB
Java
76 lines
2.0 KiB
Java
package edu.uastw;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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public class Library implements Iterable<LibraryItem> {
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private static Library instance;
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private final List<LibraryItem> libraryItems;
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private int booksCapacity = 3;
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Library() {
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this.libraryItems = new ArrayList<>();
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}
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public static Library getInstance() {
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if (instance == null) {
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instance = new Library();
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}
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return instance;
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}
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public void setBooksCapacity(int capacity) {
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this.booksCapacity = capacity;
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}
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public int getBooksCapacity() {
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return booksCapacity;
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}
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public void addLibraryItem(LibraryItem libraryItem) {
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if (libraryItems.size() < booksCapacity) {
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libraryItems.add(libraryItem);
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System.out.println("'" + libraryItem.getTitle() + "' was added.");
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} else {
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System.out.println("Library capacity reached. Cannot add more items.");
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}
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}
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public void displayLibraryItems() {
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System.out.println("Items available in the library:");
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libraryItems.forEach(libraryItem ->
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System.out.println(libraryItem.getTitle() + " by " + libraryItem.getOwner())
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);
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}
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@Override
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public Iterator<LibraryItem> iterator() {
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return new LibraryItemIterator();
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}
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private class LibraryItemIterator implements Iterator<LibraryItem> {
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private int currentIndex = 0;
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@Override
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public boolean hasNext() {
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return currentIndex < booksCapacity;
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}
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@Override
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public LibraryItem next() {
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return libraryItems.get(currentIndex++);
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}
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}
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public Iterator<LibraryItem> customTypeIterator(ItemType type) {
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List<LibraryItem> itemsOfType = new ArrayList<>();
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for (LibraryItem item : libraryItems) {
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if (item.getType() == type) {
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itemsOfType.add(item);
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}
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}
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return itemsOfType.iterator();
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}
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}
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