package reversetutorial.jdo;

import java.util.*;
import javax.jdo.*;

/**
 * Interprets a JDOQL query for magazines given on the command line and
 * prints the results.
 */
public class Finder {

    /**
     * Usage: java reversetutorial.jdo.Finder <JDOQL query>
     */
    public static void main(String[] args) {
        if (args.length != 1) {
            System.err.println("Usage: java reversetutorial.jdo.Finder "
                + "<JDOQL query>");
            return;
        }

        PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory 
            ("META-INF/jdo.properties");
        PersistenceManager pm = pmf.getPersistenceManager();
        pm.currentTransaction().setNontransactionalRead(true);
        try {
            executeQuery(pm, args[0]);
        } finally {
            pm.close();
            pmf.close();
        }
    }

    /**
     * Run a query for magazines matching the given filter.
     */
    private static void executeQuery(PersistenceManager pm, String filter) {
        Query q = pm.newQuery(Magazine.class, filter);
        q.declareVariables("Magazine mag; Article art");
        Collection results = (Collection) q.execute();
        try {
            Iterator itr = results.iterator();
            if (!itr.hasNext())
                System.out.println("No magazines matches your query");
            else
                while (itr.hasNext())
                    printMatch((Magazine) itr.next());
        } finally {
            q.close(results);
        }
    }

    /**
     * Outputs information about a magazine matching a query.
     */
    private static void printMatch(Magazine mag) {
        System.out.println("Magazine:");
        System.out.println("\tIsbn: " + mag.getIsbn());        
        System.out.println("\tIssue: " + mag.getIssue());        
        System.out.println("\tName: " + mag.getName());        
        System.out.println("\tPrice: " + mag.getPrice());        
        System.out.println("\tPublisher:");    
        System.out.println("\t\tName: " + mag.getPublisher().getName());    
        System.out.println("\t\tRevenue: " + mag.getPublisher().getRevenue());

        Collection articles = mag.getArticles();
        Article art;
        StringBuffer subBuffer;
        for (Iterator itr = articles.iterator(); itr.hasNext();) {
            art = (Article) itr.next();
            System.out.println("\tArticle:");    
            System.out.println("\t\tTitle: " + art.getTitle());    
            System.out.println("\t\tAuthor: " + art.getAuthorName());    
        }
    }
}