org.bremersee.exception.HttpResponseHeadersAware Maven / Gradle / Ivy
/*
* Copyright 2016 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.exception;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.validation.constraints.NotNull;
/**
* Marker interface to get the response headers.
*
* @author Christian Bremer
*/
public interface HttpResponseHeadersAware {
/**
* Create headers map.
*
* @param headers the headers
* @return the map
*/
static Map createHeaders(Map> headers) {
if (headers == null || headers.isEmpty()) {
return Collections.emptyMap();
}
final Map map = new LinkedHashMap<>();
for (Entry> entry : headers.entrySet()) {
if (entry.getValue() != null && !entry.getValue().isEmpty()) {
map.put(entry.getKey(), entry.getValue().iterator().next());
}
}
return map;
}
/**
* Create multi value headers map.
*
* @param headers the headers
* @return the map
*/
static Map> createMultiValueHeaders(
Map headers) {
if (headers == null || headers.isEmpty()) {
return Collections.emptyMap();
}
final Map> map = new LinkedHashMap<>();
for (Entry entry : headers.entrySet()) {
if (entry.getValue() != null) {
map.put(entry.getKey(), Collections.singletonList(entry.getValue()));
}
}
return map;
}
/**
* Gets the response headers.
*
* @return the response headers
*/
@NotNull
Map getHeaders();
/**
* Gets the response headers as multi value map.
*
* @return the response headers
*/
@NotNull
Map> getMultiValueHeaders();
}