gvsu/cs656/lab4/UserResource.java

//----------------------------------------------------------------------
//
//  Filename: BookResource.java
//  Description: 
// 
//  $Id:$
//
//----------------------------------------------------------------------
package edu.gvsu.cis.rest.example;

import java.io.IOException;

import org.restlet.Context;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.data.Status;
import org.restlet.resource.DomRepresentation;
import org.restlet.resource.Representation;
import org.restlet.resource.Variant;



/**
 * 
 * Book Resource.  This handles HTTP requests against a specific Book resource.
 * e.g. URIs of the form /v1/books/{id}
 * 
 * @author Jonathan Engelsma
 *
 */
public class BookResource extends BaseResource {

	private Book book;
	
	/**
	 * Load up the book resource data that is being called on.
	 * @param context Context of the HTTP request.
	 * @param request The HTTP request.
	 * @param response The HTTP response that will be returned to the caller.
	 */
	public BookResource(Context context, Request request, Response response) 
	{
		super(context, request, response);
		System.out.println("In BookResource");
        String id = (String) request.getAttributes().get("id");
        this.book = findBook(id);
        if(this.book != null) {
    		getVariants().add(new Variant(MediaType.TEXT_XML));	        	
        }
	}

	/**
	 * handle HTTP GET requests. Return an XML representation of the book resource.
	 */
	@Override
	public Representation getRepresentation(Variant variant) 
	{
		DomRepresentation rep=null;
		if (variant.getMediaType().equals(MediaType.TEXT_XML)){
			try {
				if (book!=null){
					rep = book.getDomRepresentation();
				}
				else{
					rep = new DomRepresentation(MediaType.TEXT_XML);
					getResponse().setStatus(Status.CLIENT_ERROR_NOT_FOUND);					
					//TODO: we need to return a 404 here. 
					//Error.embedErrorInResponse(rep.getDocument(),MediaType.TEXT_XML,Error.ErrorCode.RESOURCE_UNDEFINED);
				}
				rep.getDocument().normalizeDocument();
				
			} catch (IOException e){
				e.printStackTrace();
			}
		}
		return rep;	
	}
    
	
	@Override
	public boolean allowDelete() {
		return true;
	}
	
	/**
	 * Handle an HTTP DELETE request. Delete the book resource.
	 */
    @Override
	public void delete() 
    {
        if (this.book != null) {        	
            getContainer().delete(this.book);            
            // TODO: need to delete the book reviews here as well.
            getContainer().commit();
            getResponse().setStatus(Status.SUCCESS_OK);
        } else {
            getResponse().setStatus(Status.CLIENT_ERROR_NOT_FOUND);
        }
	}

    /**
     * PUT is implemented.
     */
	@Override
	public boolean allowPut() {
		// TODO Auto-generated method stub
		return true;
	}

	/**
	 * Update a resource in response to an HTTP PUT call.
	 */
	@Override
	public void put(Representation entity) 
	{
        try {
			if (entity.getMediaType().equals(MediaType.APPLICATION_WWW_FORM, true) && (this.book != null)) {
   
				// Parse the entity as a web form
			    Form form = new Form(entity);

			    // update the loaded Book object
			    String value = form.getFirstValue("book[authors]");            
			    if (value != null) {            	
			    	book.setAuthors(value);
			    } 
			    
			    value = form.getFirstValue("book[isbn]");
			    if(value != null) {
			    	book.setIsbn(value);
			    }

			    value = form.getFirstValue("book[title]");
			    if(value != null) {
			    	book.setTitle(value);
			    }
			    
			    value = form.getFirstValue("book[publisher]");
			    if(value != null) {
			    	book.setPublisher(value);
			    }
			    
			    value = form.getFirstValue("book[year]");
			    if (value != null ) {
			    	book.setYear(value);    
			    }
			                
			    // commit the changes.
			    getContainer().set(book);
			    getContainer().commit();
			    
			    getResponse().setStatus(Status.SUCCESS_OK);            
			    getResponse().setEntity(this.book.getDomRepresentation());
			    
			
			} else {
			    // Intentionnally hide the bookmark existence
			    getResponse().setStatus(Status.CLIENT_ERROR_NOT_FOUND);
			}
		} catch (IOException e) {
			getResponse().setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
			e.printStackTrace();
		}
	}

	/**
     * Returns the book instance.
     * @return a reference to a Book instance.
     */
	public Book getBook() {
		return this.book;
	}  
    
    
}