ItemResource.java

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package com.sun.jersey.samples.linking.resources;

import com.sun.jersey.api.NotFoundException;
import com.sun.jersey.samples.linking.model.ItemModel;
import com.sun.jersey.samples.linking.model.ItemsModel;
import com.sun.jersey.samples.linking.representation.ItemRepresentation;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

/**
 * Resource that provides access to one item from a set of items managed
 * by ItemsModel
 * @author mh124079
 */
@Path("{id}")
@Produces(MediaType.APPLICATION_XML)
public class ItemResource {

    private ItemsModel itemsModel;
    private ItemModel itemModel;
    private String id;

    public ItemResource(@PathParam("id") String id) {
        this.id = id;
        itemsModel = ItemsModel.getInstance();
        try {
            itemModel = itemsModel.getItem(id);
        } catch (IndexOutOfBoundsException ex) {
            throw new NotFoundException();
        }
    }

    @GET
    public ItemRepresentation get() {
        return new ItemRepresentation(itemModel.getName());
    }

    /**
     * Determines whether there is a next item.
     * @return
     */
    public boolean isNext() {
        return itemsModel.hasNext(id);
    }

    /**
     * Determines whether there is a previous item
     * @return
     */
    public boolean isPrev() {
        return itemsModel.hasPrev(id);
    }

    public String getNextId() {
        return itemsModel.getNextId(id);
    }

    public String getPrevId() {
        return itemsModel.getPrevId(id);
    }

    public String getId() {
        return id;
    }
}