spring HttpComponentsHeadersAdapter 源码
spring HttpComponentsHeadersAdapter 代码
文件路径:/spring-web/src/main/java/org/springframework/http/client/reactive/HttpComponentsHeadersAdapter.java
/*
* Copyright 2002-2021 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.client.reactive;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpMessage;
import org.springframework.http.HttpHeaders;
import org.springframework.lang.Nullable;
import org.springframework.util.CollectionUtils;
import org.springframework.util.MultiValueMap;
/**
* {@code MultiValueMap} implementation for wrapping Apache HttpComponents
* HttpClient headers.
*
* @author Rossen Stoyanchev
* @since 5.3
*/
class HttpComponentsHeadersAdapter implements MultiValueMap<String, String> {
private final HttpMessage message;
HttpComponentsHeadersAdapter(HttpMessage message) {
this.message = message;
}
@Override
public String getFirst(String key) {
Header header = this.message.getFirstHeader(key);
return (header != null ? header.getValue() : null);
}
@Override
public void add(String key, @Nullable String value) {
this.message.addHeader(key, value);
}
@Override
public void addAll(String key, List<? extends String> values) {
values.forEach(value -> add(key, value));
}
@Override
public void addAll(MultiValueMap<String, String> values) {
values.forEach(this::addAll);
}
@Override
public void set(String key, @Nullable String value) {
this.message.setHeader(key, value);
}
@Override
public void setAll(Map<String, String> values) {
values.forEach(this::set);
}
@Override
public Map<String, String> toSingleValueMap() {
Map<String, String> map = CollectionUtils.newLinkedHashMap(size());
this.message.headerIterator().forEachRemaining(h -> map.putIfAbsent(h.getName(), h.getValue()));
return map;
}
@Override
public int size() {
return this.message.getHeaders().length;
}
@Override
public boolean isEmpty() {
return (this.message.getHeaders().length == 0);
}
@Override
public boolean containsKey(Object key) {
return (key instanceof String headerName && this.message.containsHeader(headerName));
}
@Override
public boolean containsValue(Object value) {
return (value instanceof String &&
Arrays.stream(this.message.getHeaders()).anyMatch(h -> h.getValue().equals(value)));
}
@Nullable
@Override
public List<String> get(Object key) {
List<String> values = null;
if (containsKey(key)) {
Header[] headers = this.message.getHeaders((String) key);
values = new ArrayList<>(headers.length);
for (Header header : headers) {
values.add(header.getValue());
}
}
return values;
}
@Nullable
@Override
public List<String> put(String key, List<String> values) {
List<String> oldValues = remove(key);
values.forEach(value -> add(key, value));
return oldValues;
}
@Nullable
@Override
public List<String> remove(Object key) {
if (key instanceof String headerName) {
List<String> oldValues = get(key);
this.message.removeHeaders(headerName);
return oldValues;
}
return null;
}
@Override
public void putAll(Map<? extends String, ? extends List<String>> map) {
map.forEach(this::put);
}
@Override
public void clear() {
this.message.setHeaders();
}
@Override
public Set<String> keySet() {
Set<String> keys = new LinkedHashSet<>(size());
for (Header header : this.message.getHeaders()) {
keys.add(header.getName());
}
return keys;
}
@Override
public Collection<List<String>> values() {
Collection<List<String>> values = new ArrayList<>(size());
for (Header header : this.message.getHeaders()) {
values.add(get(header.getName()));
}
return values;
}
@Override
public Set<Entry<String, List<String>>> entrySet() {
return new AbstractSet<>() {
@Override
public Iterator<Entry<String, List<String>>> iterator() {
return new EntryIterator();
}
@Override
public int size() {
return HttpComponentsHeadersAdapter.this.size();
}
};
}
@Override
public String toString() {
return HttpHeaders.formatHeaders(this);
}
private class EntryIterator implements Iterator<Entry<String, List<String>>> {
private final Iterator<Header> iterator = message.headerIterator();
@Override
public boolean hasNext() {
return this.iterator.hasNext();
}
@Override
public Entry<String, List<String>> next() {
return new HeaderEntry(this.iterator.next().getName());
}
}
private class HeaderEntry implements Entry<String, List<String>> {
private final String key;
HeaderEntry(String key) {
this.key = key;
}
@Override
public String getKey() {
return this.key;
}
@Override
public List<String> getValue() {
List<String> values = HttpComponentsHeadersAdapter.this.get(this.key);
return values != null ? values : Collections.emptyList();
}
@Override
public List<String> setValue(List<String> value) {
List<String> previousValues = getValue();
HttpComponentsHeadersAdapter.this.put(this.key, value);
return previousValues;
}
}
}
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