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package com.sun.jersey.server.linking;

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

import com.sun.jersey.server.linking.impl.LinkProcessor;
import com.sun.jersey.server.linking.impl.RefProcessor;
import com.sun.jersey.spi.container.ContainerRequest;
import com.sun.jersey.spi.container.ContainerResponse;
import com.sun.jersey.spi.container.ContainerResponseFilter;

/**
 * Filter that processes {@link Link} annotated fields in returned response
 * entities.
 * <p/>
 * When an application is deployed as a Servlet or Filter this filter can be
 * registered using the following initialization parameters:
 * <blockquote><pre>
 *     &lt;init-param&gt
 *         &lt;param-name&gt;com.sun.jersey.spi.container.ContainerResponseFilters&lt;/param-name&gt;
 *         &lt;param-value&gt;com.sun.jersey.server.linking.LinkFilter&lt;/param-value&gt;
 *     &lt;/init-param&gt;
 * </pre></blockquote>
 * <p/>
 *
 * @author mh124079
 * @see Link
 */
public class LinkFilter implements ContainerResponseFilter {

    @Context
    private UriInfo uriInfo;

    public ContainerResponse filter(ContainerRequest request, ContainerResponse response) {
        final Object entity = response.getEntity();

        if (entity != null && !uriInfo.getMatchedResources().isEmpty()) {
            Class<?> entityClass = entity.getClass();
            LinkProcessor lhp = new LinkProcessor(entityClass);
            lhp.processLinkHeaders(entity, uriInfo, response.getHttpHeaders());
            RefProcessor lp = new RefProcessor(entityClass);
            lp.processLinks(entity, uriInfo);
        }

        return response;
    }
}