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Minipedia.java
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Minipedia.java
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/*
* Minipedia.java
*
* A client program that uses the DatabaseIterator
* and Article classes, along with additional data
* structures, to allow a user to create, modify
* and interact with a encyclopedia database.
*
* Author: Alexander Breen ([email protected]) and Wayne Snyder ([email protected])
* Date: March 24, 2014
*/
import java.util.*;
public class Minipedia{
private static Article[] getArticleTable(DatabaseIterator db) {
// count how many articles are in the directory
int count = db.getNumArticles();
// now create array
Article[] list = new Article[count];
for(int i = 0; i < count; ++i)
list[i] = db.next();
return list;
}
private static DatabaseIterator setupDatabase(String path) {
return new DatabaseIterator(path);
}
private static void addArticle(Scanner s, ArticleTable D) {
System.out.println();
System.out.println("Add an article");
System.out.println("==============");
System.out.print("Enter article title: ");
String title = s.nextLine();
System.out.println("You may now enter the body of the article.");
System.out.println("Press return two times when you are done.");
String body = "";
String line = "";
do {
line = s.nextLine();
body += line + "\n";
} while (!line.equals(""));
D.insert(new Article(title, body));
}
private static void removeArticle(Scanner s, ArticleTable D) {
System.out.println();
System.out.println("Remove an article");
System.out.println("=================");
System.out.print("Enter article title: ");
String title = s.nextLine();
D.delete(title);
}
private static void titleSearch(Scanner s, ArticleTable D) {
System.out.println();
System.out.println("Search by article title");
System.out.println("=======================");
System.out.print("Enter article title: ");
String title = s.nextLine();
Article a = D.lookup(title);
if(a != null)
System.out.println(a);
else {
System.out.println("Article not found!");
return;
}
System.out.println("Press return when finished reading.");
s.nextLine();
}
public static void main(String[] args) {
Scanner user = new Scanner(System.in);
String dbPath = "articles/";
DatabaseIterator db = setupDatabase(dbPath);
System.out.println("Read " + db.getNumArticles() +
" articles from disk.");
ArticleTable L = new ArticleTable();
Article[] A = getArticleTable(db);
L.initialize(A);
int choice = -1;
do {
System.out.println();
System.out.println("Welcome to Minipedia!");
System.out.println("=====================");
System.out.println("Make a selection from the " +
"following options:");
System.out.println();
System.out.println("Manipulating the database");
System.out.println("-------------------------");
System.out.println(" 1. add a new article");
System.out.println(" 2. remove an article");
System.out.println();
System.out.println("Searching the database");
System.out.println("----------------------");
System.out.println(" 3. search by exact article title");
System.out.println();
System.out.print("Enter a selection (1-3, or 0 to quit): ");
choice = user.nextInt();
user.nextLine();
switch (choice) {
case 0:
return;
case 1:
addArticle(user, L);
break;
case 2:
removeArticle(user, L);
break;
case 3:
titleSearch(user, L);
break;
default:
break;
}
choice = -1;
} while (choice < 0 || choice > 4);
}
}