juneau-rest/juneau-rest-server/src/main/java/org/apache/juneau/rest/widget/ContentTypeMenuItem.java

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package org.apache.juneau.rest.widget;

import static org.apache.juneau.dto.html5.HtmlBuilder.*;

import java.net.*;
import java.util.*;

import org.apache.juneau.dto.html5.*;
import org.apache.juneau.http.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.serializer.*;
import org.apache.juneau.utils.*;

/**
 * Widget that returns back a list of hyperlinks for rendering the contents of a page in a variety of content types.
 *
 * <p>
 * The variable it resolves is <js>"$W{ContentTypeMenuItem}"</js>.
 *
 * <p>
 * An example of this widget can be found in the <c>PetStoreResource</c> in the examples that provides
 * a drop-down menu item for rendering all other supported content types in plain text:
 * <p class='bcode w800'>
 * 	<ja>@RestMethod</ja>(
 * 		name=<jsf>GET</jsf>,
 * 		path=<js>"/"</js>
 * 	)
 *  <ja>@HtmlDocConfig</ja>(
 * 		widgets={
 * 			ContentTypeMenuItem.<jk>class</jk>,
 * 		},
 * 		navlinks={
 * 			<js>"up: ..."</js>,
 * 			<js>"options: ..."</js>,
 * 			<js>"$W{QueryMenuItem}"</js>,
 * 			<js>"$W{ContentTypeMenuItem}"</js>,
 * 			<js>"$W{ThemeMenuItem}"</js>,
 * 			<js>"source: ..."</js>
 * 		}
 * 	)
 * 	<jk>public</jk> Collection&lt;Pet&gt; getPets() {
 * </p>
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc juneau-rest-server.HtmlDocAnnotation.PredefinedWidgets}
 * </ul>
 */
public class ContentTypeMenuItem extends MenuItemWidget {

	@Override /* MenuItemWidget */
	public String getLabel(RestRequest req, RestResponse res) {
		return "content-type";
	}

	@Override /* MenuItemWidget */
	public Div getContent(RestRequest req, RestResponse res) {
		Div div = div();
		Set<MediaType> l = new TreeSet<>();
		for (Serializer s : req.getSerializers().getSerializers())
			l.add(s.getPrimaryMediaType());
		for (MediaType mt : l) {
			URI uri = req.getUri(true, new AMap<String,String>().append("plainText","true").append("Accept",mt.toString()));
			div.children(a(uri, mt), br());
		}
		return div;
	}
}