org.bremersee.http.HttpHeadersHelper Maven / Gradle / Ivy
/*
* Copyright 2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.bremersee.http;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.function.BiConsumer;
import org.springframework.http.HttpHeaders;
import org.springframework.util.MultiValueMap;
/**
* Helper to create http headers.
*
* @author Christian Bremer
*/
public abstract class HttpHeadersHelper {
private HttpHeadersHelper() {
}
/**
* Build http headers.
*
* @param headers the headers
* @return the http headers
*/
public static HttpHeaders buildHttpHeaders(
final Map> headers) {
if (headers instanceof HttpHeaders) {
return (HttpHeaders) headers;
}
if (headers instanceof MultiValueMap) {
//noinspection unchecked
return new HttpHeaders((MultiValueMap) headers);
}
final HttpHeaders httpHeaders = new HttpHeaders();
if (headers != null) {
headers.forEach(
(BiConsumer>) (key, values)
-> httpHeaders.addAll(key, values != null
? new ArrayList<>(values)
: Collections.emptyList()));
}
return httpHeaders;
}
}