package com.briup.service;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import com.briup.pojo.Book;

public class BookService {
	private final static BookService instance=new BookService();
	private final static Map<Long,Book> books=new HashMap<Long,Book>();
	static{
		books.put(1L, new Book(1L,"jdbc",20.0));
		books.put(2L, new Book(2L,"hibernate",30.0));
		books.put(3L, new Book(3L,"servlet",40.0));
		books.put(4L, new Book(4L,"jsp",50.0));
	}
	public static BookService getInstance(){
		return instance;
	}
	public Collection<Book> getBooks(){
		return books.values();
	}
	public Book getBook(Long id){
		return books.get(id);
	}
	//add,edit
	public void storeBook(Book  book){
		books.put(book.getId(), book);
	}
	public void removeBook(Long id){
		books.remove(id);
	}	
	public void removeBooks(Long[] ids){
		for(Long id:ids){
			books.remove(id);
		}
	}
}