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/*
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 *
 * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
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package com.sun.jersey.server.linking.impl;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.UriInfo;

import com.sun.jersey.core.header.LinkHeader;
import com.sun.jersey.core.header.LinkHeader.LinkHeaderBuilder;
import com.sun.jersey.server.linking.Link;
import com.sun.jersey.server.linking.el.LinkBuilder;

/**
 * Processes @Link and @LinkHeaders annotations on entity classes and
 * adds appropriate HTTP Link headers.
 *
 * @author mh124079
 */
public class LinkProcessor {

    private EntityDescriptor instanceDescriptor;

    public LinkProcessor(Class c) {
        instanceDescriptor = EntityDescriptor.getInstance(c);
    }

    /**
     * Process any {@link Link} annotations on the supplied entity.
     * @param entity the entity object returned by the resource method
     * @param uriInfo the uriInfo for the request
     * @param headers the map into which the headers will be added
     */
    public void processLinkHeaders(T entity, UriInfo uriInfo, MultivaluedMap headers) {
        List headerValues = getLinkHeaderValues(entity, uriInfo);
        for (String headerValue: headerValues) {
            headers.add("Link", headerValue);
        }
    }

    List getLinkHeaderValues(Object entity, UriInfo uriInfo) {
        final List