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| 1 | +/* |
| 2 | + * Copyright 2002-2020 the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package org.springframework.http.client.reactive; |
| 18 | + |
| 19 | +import java.util.AbstractSet; |
| 20 | +import java.util.ArrayList; |
| 21 | +import java.util.Arrays; |
| 22 | +import java.util.Collection; |
| 23 | +import java.util.Collections; |
| 24 | +import java.util.Iterator; |
| 25 | +import java.util.LinkedHashMap; |
| 26 | +import java.util.LinkedHashSet; |
| 27 | +import java.util.List; |
| 28 | +import java.util.Map; |
| 29 | +import java.util.Set; |
| 30 | + |
| 31 | +import org.apache.hc.core5.http.Header; |
| 32 | +import org.apache.hc.core5.http.HttpResponse; |
| 33 | + |
| 34 | +import org.springframework.http.HttpHeaders; |
| 35 | +import org.springframework.lang.Nullable; |
| 36 | +import org.springframework.util.MultiValueMap; |
| 37 | + |
| 38 | +/** |
| 39 | + * {@code MultiValueMap} implementation for wrapping Apache HttpComponents |
| 40 | + * HttpClient headers. |
| 41 | + * |
| 42 | + * @author Rossen Stoyanchev |
| 43 | + * @since 5.3 |
| 44 | + */ |
| 45 | +class HttpComponentsHeadersAdapter implements MultiValueMap<String, String> { |
| 46 | + |
| 47 | + private final HttpResponse response; |
| 48 | + |
| 49 | + |
| 50 | + HttpComponentsHeadersAdapter(HttpResponse response) { |
| 51 | + this.response = response; |
| 52 | + } |
| 53 | + |
| 54 | + |
| 55 | + @Override |
| 56 | + public String getFirst(String key) { |
| 57 | + Header header = this.response.getFirstHeader(key); |
| 58 | + return (header != null ? header.getValue() : null); |
| 59 | + } |
| 60 | + |
| 61 | + @Override |
| 62 | + public void add(String key, @Nullable String value) { |
| 63 | + this.response.addHeader(key, value); |
| 64 | + } |
| 65 | + |
| 66 | + @Override |
| 67 | + public void addAll(String key, List<? extends String> values) { |
| 68 | + values.forEach(value -> add(key, value)); |
| 69 | + } |
| 70 | + |
| 71 | + @Override |
| 72 | + public void addAll(MultiValueMap<String, String> values) { |
| 73 | + values.forEach(this::addAll); |
| 74 | + } |
| 75 | + |
| 76 | + @Override |
| 77 | + public void set(String key, @Nullable String value) { |
| 78 | + this.response.setHeader(key, value); |
| 79 | + } |
| 80 | + |
| 81 | + @Override |
| 82 | + public void setAll(Map<String, String> values) { |
| 83 | + values.forEach(this::set); |
| 84 | + } |
| 85 | + |
| 86 | + @Override |
| 87 | + public Map<String, String> toSingleValueMap() { |
| 88 | + Map<String, String> map = new LinkedHashMap<>(size()); |
| 89 | + this.response.headerIterator().forEachRemaining(h -> map.putIfAbsent(h.getName(), h.getValue())); |
| 90 | + return map; |
| 91 | + } |
| 92 | + |
| 93 | + @Override |
| 94 | + public int size() { |
| 95 | + return this.response.getHeaders().length; |
| 96 | + } |
| 97 | + |
| 98 | + @Override |
| 99 | + public boolean isEmpty() { |
| 100 | + return (this.response.getHeaders().length == 0); |
| 101 | + } |
| 102 | + |
| 103 | + @Override |
| 104 | + public boolean containsKey(Object key) { |
| 105 | + return (key instanceof String && this.response.containsHeader((String) key)); |
| 106 | + } |
| 107 | + |
| 108 | + @Override |
| 109 | + public boolean containsValue(Object value) { |
| 110 | + return (value instanceof String && |
| 111 | + Arrays.stream(this.response.getHeaders()).anyMatch(h -> h.getValue().equals(value))); |
| 112 | + } |
| 113 | + |
| 114 | + @Nullable |
| 115 | + @Override |
| 116 | + public List<String> get(Object key) { |
| 117 | + List<String> values = null; |
| 118 | + if (containsKey(key)) { |
| 119 | + Header[] headers = this.response.getHeaders((String) key); |
| 120 | + values = new ArrayList<>(headers.length); |
| 121 | + for (Header header : headers) { |
| 122 | + values.add(header.getValue()); |
| 123 | + } |
| 124 | + } |
| 125 | + return values; |
| 126 | + } |
| 127 | + |
| 128 | + @Nullable |
| 129 | + @Override |
| 130 | + public List<String> put(String key, List<String> values) { |
| 131 | + List<String> oldValues = remove(key); |
| 132 | + values.forEach(value -> add(key, value)); |
| 133 | + return oldValues; |
| 134 | + } |
| 135 | + |
| 136 | + @Nullable |
| 137 | + @Override |
| 138 | + public List<String> remove(Object key) { |
| 139 | + if (key instanceof String) { |
| 140 | + List<String> oldValues = get(key); |
| 141 | + this.response.removeHeaders((String) key); |
| 142 | + return oldValues; |
| 143 | + } |
| 144 | + return null; |
| 145 | + } |
| 146 | + |
| 147 | + @Override |
| 148 | + public void putAll(Map<? extends String, ? extends List<String>> map) { |
| 149 | + map.forEach(this::put); |
| 150 | + } |
| 151 | + |
| 152 | + @Override |
| 153 | + public void clear() { |
| 154 | + this.response.setHeaders(); |
| 155 | + } |
| 156 | + |
| 157 | + @Override |
| 158 | + public Set<String> keySet() { |
| 159 | + Set<String> keys = new LinkedHashSet<>(size()); |
| 160 | + for (Header header : this.response.getHeaders()) { |
| 161 | + keys.add(header.getName()); |
| 162 | + } |
| 163 | + return keys; |
| 164 | + } |
| 165 | + |
| 166 | + @Override |
| 167 | + public Collection<List<String>> values() { |
| 168 | + Collection<List<String>> values = new ArrayList<>(size()); |
| 169 | + for (Header header : this.response.getHeaders()) { |
| 170 | + values.add(get(header.getName())); |
| 171 | + } |
| 172 | + return values; |
| 173 | + } |
| 174 | + |
| 175 | + @Override |
| 176 | + public Set<Entry<String, List<String>>> entrySet() { |
| 177 | + return new AbstractSet<Entry<String, List<String>>>() { |
| 178 | + @Override |
| 179 | + public Iterator<Entry<String, List<String>>> iterator() { |
| 180 | + return new EntryIterator(); |
| 181 | + } |
| 182 | + |
| 183 | + @Override |
| 184 | + public int size() { |
| 185 | + return HttpComponentsHeadersAdapter.this.size(); |
| 186 | + } |
| 187 | + }; |
| 188 | + } |
| 189 | + |
| 190 | + |
| 191 | + @Override |
| 192 | + public String toString() { |
| 193 | + return HttpHeaders.formatHeaders(this); |
| 194 | + } |
| 195 | + |
| 196 | + |
| 197 | + private class EntryIterator implements Iterator<Entry<String, List<String>>> { |
| 198 | + |
| 199 | + private Iterator<Header> iterator = response.headerIterator(); |
| 200 | + |
| 201 | + @Override |
| 202 | + public boolean hasNext() { |
| 203 | + return this.iterator.hasNext(); |
| 204 | + } |
| 205 | + |
| 206 | + @Override |
| 207 | + public Entry<String, List<String>> next() { |
| 208 | + return new HeaderEntry(this.iterator.next().getName()); |
| 209 | + } |
| 210 | + } |
| 211 | + |
| 212 | + |
| 213 | + private class HeaderEntry implements Entry<String, List<String>> { |
| 214 | + |
| 215 | + private final String key; |
| 216 | + |
| 217 | + HeaderEntry(String key) { |
| 218 | + this.key = key; |
| 219 | + } |
| 220 | + |
| 221 | + @Override |
| 222 | + public String getKey() { |
| 223 | + return this.key; |
| 224 | + } |
| 225 | + |
| 226 | + @Override |
| 227 | + public List<String> getValue() { |
| 228 | + List<String> values = HttpComponentsHeadersAdapter.this.get(this.key); |
| 229 | + return values != null ? values : Collections.emptyList(); |
| 230 | + } |
| 231 | + |
| 232 | + @Override |
| 233 | + public List<String> setValue(List<String> value) { |
| 234 | + List<String> previousValues = getValue(); |
| 235 | + HttpComponentsHeadersAdapter.this.put(this.key, value); |
| 236 | + return previousValues; |
| 237 | + } |
| 238 | + } |
| 239 | + |
| 240 | +} |
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