| /* |
| * Copyright 2009 Niclas Hedhman. |
| * Copyright 2012 Paul Merlin. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. |
| * |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.zest.tutorials.services.step3; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import org.apache.zest.api.injection.scope.Structure; |
| import org.apache.zest.api.value.ValueBuilder; |
| import org.apache.zest.api.value.ValueBuilderFactory; |
| |
| public class LibraryMixin |
| implements Library |
| { |
| @Structure |
| ValueBuilderFactory factory; |
| private HashMap<String, ArrayList<Book>> books; |
| |
| public LibraryMixin() |
| { |
| books = new HashMap<String, ArrayList<Book>>(); |
| } |
| |
| @Override |
| public void createInitialData() |
| { |
| createBook( "Eric Evans", "Domain Driven Design", 2 ); |
| createBook( "Andy Hunt", "Pragmatic Programmer", 3 ); |
| createBook( "Kent Beck", "Extreme Programming Explained", 5 ); |
| } |
| |
| @Override |
| public Book borrowBook( String author, String title ) |
| { |
| String key = constructKey( author, title ); |
| ArrayList<Book> copies = books.get( key ); |
| if( copies == null ) |
| { |
| System.out.println( "Book not available." ); |
| return null; // Indicate that book is not available. |
| } |
| Book book = copies.remove( 0 ); |
| if( book == null ) |
| { |
| System.out.println( "Book not available." ); |
| return null; // Indicate that book is not available. |
| } |
| System.out.println( "Book borrowed: " + book.title().get() + " by " + book.author().get() ); |
| return book; |
| } |
| |
| @Override |
| public void returnBook( Book book ) |
| { |
| System.out.println( "Book returned: " + book.title().get() + " by " + book.author().get() ); |
| String key = constructKey( book.author().get(), book.title().get() ); |
| ArrayList<Book> copies = books.get( key ); |
| if( copies == null ) |
| { |
| throw new IllegalStateException( "Book " + book + " was not borrowed here." ); |
| } |
| copies.add( book ); |
| } |
| |
| private void createBook( String author, String title, int copies ) |
| { |
| ArrayList<Book> bookCopies = new ArrayList<Book>(); |
| String key = constructKey( author, title ); |
| books.put( key, bookCopies ); |
| |
| for( int i = 0; i < copies; i++ ) |
| { |
| ValueBuilder<Book> builder = factory.newValueBuilder( Book.class ); |
| Book prototype = builder.prototype(); |
| prototype.author().set( author ); |
| prototype.title().set( title ); |
| |
| Book book = builder.newInstance(); |
| bookCopies.add( book ); |
| } |
| } |
| |
| private String constructKey( String author, String title ) |
| { |
| return author + "::" + title; |
| } |
| } |