org.springframework.http.support.Netty5HeadersAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2023 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
*
* https://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.springframework.http.support;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.StreamSupport;
import io.netty5.handler.codec.http.headers.HttpHeaders;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.MultiValueMap;
/**
* {@code MultiValueMap} implementation for wrapping Netty HTTP headers.
*
* @author Violeta Georgieva
* @since 6.1
*/
public final class Netty5HeadersAdapter implements MultiValueMap {
private final HttpHeaders headers;
/**
* Create a new {@code Netty5HeadersAdapter} based on the given
* {@code HttpHeaders}.
*/
public Netty5HeadersAdapter(HttpHeaders headers) {
Assert.notNull(headers, "Headers must not be null");
this.headers = headers;
}
@Override
@Nullable
public String getFirst(String key) {
CharSequence value = this.headers.get(key);
return (value != null ? value.toString() : null);
}
@Override
public void add(String key, @Nullable String value) {
if (value != null) {
this.headers.add(key, value);
}
}
@Override
public void addAll(String key, List values) {
this.headers.add(key, values);
}
@Override
public void addAll(MultiValueMap values) {
values.forEach(this.headers::add);
}
@Override
public void set(String key, @Nullable String value) {
if (value != null) {
this.headers.set(key, value);
}
}
@Override
public void setAll(Map values) {
values.forEach(this.headers::set);
}
@Override
public Map toSingleValueMap() {
Map singleValueMap = CollectionUtils.newLinkedHashMap(this.headers.size());
this.headers.forEach(entry -> singleValueMap.putIfAbsent(
entry.getKey().toString(), entry.getValue().toString()));
return singleValueMap;
}
@Override
public int size() {
return this.headers.names().size();
}
@Override
public boolean isEmpty() {
return this.headers.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return (key instanceof String headerName && this.headers.contains(headerName));
}
@Override
public boolean containsValue(Object value) {
return (value instanceof String &&
StreamSupport.stream(this.headers.spliterator(), false)
.anyMatch(entry -> value.equals(entry.getValue())));
}
@Override
@Nullable
public List get(Object key) {
Iterator iterator = this.headers.valuesIterator((CharSequence) key);
if (iterator.hasNext()) {
List result = new ArrayList<>();
iterator.forEachRemaining(value -> result.add(value.toString()));
return result;
}
return null;
}
@Nullable
@Override
public List put(String key, @Nullable List value) {
List previousValues = get(key);
this.headers.set(key, value);
return previousValues;
}
@Nullable
@Override
public List remove(Object key) {
if (key instanceof String headerName) {
List previousValues = get(headerName);
this.headers.remove(headerName);
return previousValues;
}
return null;
}
@Override
public void putAll(Map> map) {
map.forEach(this.headers::set);
}
@Override
public void clear() {
this.headers.clear();
}
@Override
public Set keySet() {
return new HeaderNames();
}
@Override
public Collection> values() {
List> result = new ArrayList<>(this.headers.size());
forEach((key, value) -> result.add(value));
return result;
}
@Override
public Set>> entrySet() {
return new AbstractSet<>() {
@Override
public Iterator>> iterator() {
return new EntryIterator();
}
@Override
public int size() {
return headers.size();
}
};
}
@Override
public String toString() {
return org.springframework.http.HttpHeaders.formatHeaders(this);
}
private class EntryIterator implements Iterator>> {
private final Iterator names = headers.names().iterator();
@Override
public boolean hasNext() {
return this.names.hasNext();
}
@Override
public Entry> next() {
return new HeaderEntry(this.names.next());
}
}
private class HeaderEntry implements Entry> {
private final CharSequence key;
HeaderEntry(CharSequence key) {
this.key = key;
}
@Override
public String getKey() {
return this.key.toString();
}
@Override
public List getValue() {
List values = get(this.key);
return (values != null ? values : Collections.emptyList());
}
@Override
public List setValue(List value) {
List previousValues = getValue();
headers.set(this.key, value);
return previousValues;
}
}
private class HeaderNames extends AbstractSet {
@Override
public Iterator iterator() {
return new HeaderNamesIterator(headers.names().iterator());
}
@Override
public int size() {
return headers.names().size();
}
}
private final class HeaderNamesIterator implements Iterator {
private final Iterator iterator;
@Nullable
private CharSequence currentName;
private HeaderNamesIterator(Iterator iterator) {
this.iterator = iterator;
}
@Override
public boolean hasNext() {
return this.iterator.hasNext();
}
@Override
public String next() {
this.currentName = this.iterator.next();
return this.currentName.toString();
}
@Override
public void remove() {
if (this.currentName == null) {
throw new IllegalStateException("No current Header in iterator");
}
if (!headers.contains(this.currentName)) {
throw new IllegalStateException("Header not present: " + this.currentName);
}
headers.remove(this.currentName);
}
}
}