| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.step6; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.StringTokenizer; |
| import org.apache.zest.api.configuration.Configuration; |
| import org.apache.zest.api.configuration.ConfigurationComposite; |
| import org.apache.zest.api.injection.scope.Structure; |
| import org.apache.zest.api.injection.scope.This; |
| import org.apache.zest.api.property.Property; |
| import org.apache.zest.api.value.ValueBuilder; |
| import org.apache.zest.api.value.ValueBuilderFactory; |
| |
| public class LibraryService |
| implements Library |
| { |
| public static interface LibraryConfiguration |
| extends ConfigurationComposite |
| { |
| Property<String> titles(); |
| |
| Property<String> authors(); |
| |
| Property<Integer> copies(); |
| } |
| |
| private HashMap<String, ArrayList<Book>> books; |
| |
| public LibraryService( @This Configuration<LibraryConfiguration> config, |
| @Structure ValueBuilderFactory factory |
| ) |
| { |
| books = new HashMap<String, ArrayList<Book>>(); |
| String titles = config.get().titles().get(); |
| String authors = config.get().authors().get(); |
| int copies = config.get().copies().get(); |
| StringTokenizer titlesSt = new StringTokenizer( titles, ",", false ); |
| StringTokenizer authorSt = new StringTokenizer( authors, ",", false ); |
| while( titlesSt.hasMoreTokens() ) |
| { |
| String title = titlesSt.nextToken(); |
| String author = authorSt.nextToken(); |
| createBook( factory, author, title, copies ); |
| } |
| } |
| |
| @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( ValueBuilderFactory factory, 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(); |
| System.out.println( "Book created: " + book ); |
| bookCopies.add( book ); |
| } |
| } |
| |
| private String constructKey( String author, String title ) |
| { |
| return author + "::" + title; |
| } |
| } |