src/main/java/org/takes/facets/fork/FkContentType.java
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2024 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.facets.fork;
import java.io.IOException;
import lombok.EqualsAndHashCode;
import org.takes.Request;
import org.takes.Response;
import org.takes.Take;
import org.takes.misc.Opt;
import org.takes.rq.RqHeaders;
import org.takes.tk.TkFixed;
/**
* Fork by Content-type accepted by "Content-Type" HTTP header.
*
* <p>The class is immutable and thread-safe.
*
* @since 1.0
* @see RsFork
*/
@EqualsAndHashCode
public final class FkContentType implements Fork {
/**
* Type we can deliver.
*/
private final MediaTypes type;
/**
* Take to handle the request and dynamically return the response.
*/
private final Take take;
/**
* Ctor.
* @param atype Accepted type
* @param response Response to return
*/
public FkContentType(final String atype, final Response response) {
this(atype, new TkFixed(response));
}
/**
* Ctor.
* @param atype Accepted type
* @param take Take to handle the request dynamically.
*/
public FkContentType(final String atype, final Take take) {
this.type = new MediaTypes(atype);
this.take = take;
}
@Override
public Opt<Response> route(final Request req) throws Exception {
final Opt<Response> resp;
if (FkContentType.getType(req).contains(this.type)) {
resp = new Opt.Single<>(this.take.act(req));
} else {
resp = new Opt.Empty<>();
}
return resp;
}
/**
* Get Content-Type type provided by the client.
* @param req Request
* @return Media type
* @throws IOException If fails
*/
@SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
private static MediaTypes getType(final Request req) throws IOException {
MediaTypes list = new MediaTypes();
final Iterable<String> headers = new RqHeaders.Base(req)
.header("Content-Type");
for (final String hdr : headers) {
list = list.merge(new MediaTypes(hdr));
}
if (list.isEmpty()) {
list = new MediaTypes("*/*");
}
return list;
}
}