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Jersey support for declarative hyperlinking.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
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 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.linking;

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

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

import org.glassfish.jersey.linking.mapping.ResourceMappingContext;

/**
 * Processes @Link and @LinkHeaders annotations on entity classes and
 * adds appropriate HTTP Link headers.
 *
 * @author Mark Hadley
 * @author Gerard Davison (gerard.davison at oracle.com)
 */
class HeaderProcessor {

    private EntityDescriptor instanceDescriptor;

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

    /**
     * Process any {@link InjectLink} 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,
                                   ResourceMappingContext rmc,
                                   MultivaluedMap headers) {
        List headerValues = getLinkHeaderValues(entity, uriInfo, rmc);
        for (String headerValue : headerValues) {
            headers.add("Link", headerValue);
        }
    }

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