spring StompHeaders 源码
spring StompHeaders 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompHeaders.java
/*
* Copyright 2002-2020 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.messaging.simp.stomp;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Represents STOMP frame headers.
*
* <p>In addition to the normal methods defined by {@link Map}, this class offers
* the following convenience methods:
* <ul>
* <li>{@link #getFirst(String)} return the first value for a header name</li>
* <li>{@link #add(String, String)} add to the list of values for a header name</li>
* <li>{@link #set(String, String)} set a header name to a single string value</li>
* </ul>
*
* @author Rossen Stoyanchev
* @since 4.2
* @see <a href="https://stomp.github.io/stomp-specification-1.2.html#Frames_and_Headers">
* https://stomp.github.io/stomp-specification-1.2.html#Frames_and_Headers</a>
*/
public class StompHeaders implements MultiValueMap<String, String>, Serializable {
private static final long serialVersionUID = 7514642206528452544L;
// Standard headers (as defined in the spec)
public static final String CONTENT_TYPE = "content-type"; // SEND, MESSAGE, ERROR
public static final String CONTENT_LENGTH = "content-length"; // SEND, MESSAGE, ERROR
public static final String RECEIPT = "receipt"; // any client frame other than CONNECT
// CONNECT
public static final String HOST = "host";
public static final String ACCEPT_VERSION = "accept-version";
public static final String LOGIN = "login";
public static final String PASSCODE = "passcode";
public static final String HEARTBEAT = "heart-beat";
// CONNECTED
public static final String SESSION = "session";
public static final String SERVER = "server";
// SEND
public static final String DESTINATION = "destination";
// SUBSCRIBE, UNSUBSCRIBE
public static final String ID = "id";
public static final String ACK = "ack";
// MESSAGE
public static final String SUBSCRIPTION = "subscription";
public static final String MESSAGE_ID = "message-id";
// RECEIPT
public static final String RECEIPT_ID = "receipt-id";
private final Map<String, List<String>> headers;
/**
* Create a new instance to be populated with new header values.
*/
public StompHeaders() {
this(new LinkedMultiValueMap<>(3), false);
}
private StompHeaders(Map<String, List<String>> headers, boolean readOnly) {
Assert.notNull(headers, "'headers' must not be null");
if (readOnly) {
Map<String, List<String>> map = new LinkedMultiValueMap<>(headers.size());
headers.forEach((key, value) -> map.put(key, Collections.unmodifiableList(value)));
this.headers = Collections.unmodifiableMap(map);
}
else {
this.headers = headers;
}
}
/**
* Set the content-type header.
* Applies to the SEND, MESSAGE, and ERROR frames.
*/
public void setContentType(@Nullable MimeType mimeType) {
if (mimeType != null) {
Assert.isTrue(!mimeType.isWildcardType(), "'Content-Type' cannot contain wildcard type '*'");
Assert.isTrue(!mimeType.isWildcardSubtype(), "'Content-Type' cannot contain wildcard subtype '*'");
set(CONTENT_TYPE, mimeType.toString());
}
else {
set(CONTENT_TYPE, null);
}
}
/**
* Return the content-type header value.
*/
@Nullable
public MimeType getContentType() {
String value = getFirst(CONTENT_TYPE);
return (StringUtils.hasLength(value) ? MimeTypeUtils.parseMimeType(value) : null);
}
/**
* Set the content-length header.
* Applies to the SEND, MESSAGE, and ERROR frames.
*/
public void setContentLength(long contentLength) {
set(CONTENT_LENGTH, Long.toString(contentLength));
}
/**
* Return the content-length header or -1 if unknown.
*/
public long getContentLength() {
String value = getFirst(CONTENT_LENGTH);
return (value != null ? Long.parseLong(value) : -1);
}
/**
* Set the receipt header.
* Applies to any client frame other than CONNECT.
*/
public void setReceipt(@Nullable String receipt) {
set(RECEIPT, receipt);
}
/**
* Get the receipt header.
*/
@Nullable
public String getReceipt() {
return getFirst(RECEIPT);
}
/**
* Set the host header.
* Applies to the CONNECT frame.
*/
public void setHost(@Nullable String host) {
set(HOST, host);
}
/**
* Get the host header.
*/
@Nullable
public String getHost() {
return getFirst(HOST);
}
/**
* Set the accept-version header. Must be one of "1.1", "1.2", or both.
* Applies to the CONNECT frame.
* @since 5.0.7
*/
public void setAcceptVersion(@Nullable String... acceptVersions) {
if (ObjectUtils.isEmpty(acceptVersions)) {
set(ACCEPT_VERSION, null);
return;
}
Arrays.stream(acceptVersions).forEach(version ->
Assert.isTrue(version != null && (version.equals("1.1") || version.equals("1.2")),
"Invalid version: " + version));
set(ACCEPT_VERSION, StringUtils.arrayToCommaDelimitedString(acceptVersions));
}
/**
* Get the accept-version header.
* @since 5.0.7
*/
@Nullable
public String[] getAcceptVersion() {
String value = getFirst(ACCEPT_VERSION);
return value != null ? StringUtils.commaDelimitedListToStringArray(value) : null;
}
/**
* Set the login header.
* Applies to the CONNECT frame.
*/
public void setLogin(@Nullable String login) {
set(LOGIN, login);
}
/**
* Get the login header.
*/
@Nullable
public String getLogin() {
return getFirst(LOGIN);
}
/**
* Set the passcode header.
* Applies to the CONNECT frame.
*/
public void setPasscode(@Nullable String passcode) {
set(PASSCODE, passcode);
}
/**
* Get the passcode header.
*/
@Nullable
public String getPasscode() {
return getFirst(PASSCODE);
}
/**
* Set the heartbeat header.
* Applies to the CONNECT and CONNECTED frames.
*/
public void setHeartbeat(@Nullable long[] heartbeat) {
if (heartbeat == null || heartbeat.length != 2) {
throw new IllegalArgumentException("Heart-beat array must be of length 2, not " +
(heartbeat != null ? heartbeat.length : "null"));
}
String value = heartbeat[0] + "," + heartbeat[1];
if (heartbeat[0] < 0 || heartbeat[1] < 0) {
throw new IllegalArgumentException("Heart-beat values cannot be negative: " + value);
}
set(HEARTBEAT, value);
}
/**
* Get the heartbeat header.
*/
@Nullable
public long[] getHeartbeat() {
String rawValue = getFirst(HEARTBEAT);
String[] rawValues = StringUtils.split(rawValue, ",");
if (rawValues == null) {
return null;
}
return new long[] {Long.parseLong(rawValues[0]), Long.parseLong(rawValues[1])};
}
/**
* Whether heartbeats are enabled. Returns {@code false} if
* {@link #setHeartbeat} is set to "0,0", and {@code true} otherwise.
*/
public boolean isHeartbeatEnabled() {
long[] heartbeat = getHeartbeat();
return (heartbeat != null && heartbeat[0] != 0 && heartbeat[1] != 0);
}
/**
* Set the session header.
* Applies to the CONNECTED frame.
*/
public void setSession(@Nullable String session) {
set(SESSION, session);
}
/**
* Get the session header.
*/
@Nullable
public String getSession() {
return getFirst(SESSION);
}
/**
* Set the server header.
* Applies to the CONNECTED frame.
*/
public void setServer(@Nullable String server) {
set(SERVER, server);
}
/**
* Get the server header.
* Applies to the CONNECTED frame.
*/
@Nullable
public String getServer() {
return getFirst(SERVER);
}
/**
* Set the destination header.
*/
public void setDestination(@Nullable String destination) {
set(DESTINATION, destination);
}
/**
* Get the destination header.
* Applies to the SEND, SUBSCRIBE, and MESSAGE frames.
*/
@Nullable
public String getDestination() {
return getFirst(DESTINATION);
}
/**
* Set the id header.
* Applies to the SUBSCR0BE, UNSUBSCRIBE, and ACK or NACK frames.
*/
public void setId(@Nullable String id) {
set(ID, id);
}
/**
* Get the id header.
*/
@Nullable
public String getId() {
return getFirst(ID);
}
/**
* Set the ack header to one of "auto", "client", or "client-individual".
* Applies to the SUBSCRIBE and MESSAGE frames.
*/
public void setAck(@Nullable String ack) {
set(ACK, ack);
}
/**
* Get the ack header.
*/
@Nullable
public String getAck() {
return getFirst(ACK);
}
/**
* Set the login header.
* Applies to the MESSAGE frame.
*/
public void setSubscription(@Nullable String subscription) {
set(SUBSCRIPTION, subscription);
}
/**
* Get the subscription header.
*/
@Nullable
public String getSubscription() {
return getFirst(SUBSCRIPTION);
}
/**
* Set the message-id header.
* Applies to the MESSAGE frame.
*/
public void setMessageId(@Nullable String messageId) {
set(MESSAGE_ID, messageId);
}
/**
* Get the message-id header.
*/
@Nullable
public String getMessageId() {
return getFirst(MESSAGE_ID);
}
/**
* Set the receipt-id header.
* Applies to the RECEIPT frame.
*/
public void setReceiptId(@Nullable String receiptId) {
set(RECEIPT_ID, receiptId);
}
/**
* Get the receipt header.
*/
@Nullable
public String getReceiptId() {
return getFirst(RECEIPT_ID);
}
/**
* Return the first header value for the given header name, if any.
* @param headerName the header name
* @return the first header value, or {@code null} if none
*/
@Override
@Nullable
public String getFirst(String headerName) {
List<String> headerValues = this.headers.get(headerName);
return headerValues != null ? headerValues.get(0) : null;
}
/**
* Add the given, single header value under the given name.
* @param headerName the header name
* @param headerValue the header value
* @throws UnsupportedOperationException if adding headers is not supported
* @see #put(String, List)
* @see #set(String, String)
*/
@Override
public void add(String headerName, @Nullable String headerValue) {
List<String> headerValues = this.headers.computeIfAbsent(headerName, k -> new ArrayList<>(1));
headerValues.add(headerValue);
}
@Override
public void addAll(String headerName, List<? extends String> headerValues) {
List<String> currentValues = this.headers.computeIfAbsent(headerName, k -> new ArrayList<>(1));
currentValues.addAll(headerValues);
}
@Override
public void addAll(MultiValueMap<String, String> values) {
values.forEach(this::addAll);
}
/**
* Set the given, single header value under the given name.
* @param headerName the header name
* @param headerValue the header value
* @throws UnsupportedOperationException if adding headers is not supported
* @see #put(String, List)
* @see #add(String, String)
*/
@Override
public void set(String headerName, @Nullable String headerValue) {
List<String> headerValues = new ArrayList<>(1);
headerValues.add(headerValue);
this.headers.put(headerName, headerValues);
}
@Override
public void setAll(Map<String, String> values) {
values.forEach(this::set);
}
@Override
public Map<String, String> toSingleValueMap() {
LinkedHashMap<String, String> singleValueMap = CollectionUtils.newLinkedHashMap(this.headers.size());
this.headers.forEach((key, value) -> singleValueMap.put(key, value.get(0)));
return singleValueMap;
}
// Map implementation
@Override
public int size() {
return this.headers.size();
}
@Override
public boolean isEmpty() {
return this.headers.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return this.headers.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return this.headers.containsValue(value);
}
@Override
public List<String> get(Object key) {
return this.headers.get(key);
}
@Override
public List<String> put(String key, List<String> value) {
return this.headers.put(key, value);
}
@Override
public List<String> remove(Object key) {
return this.headers.remove(key);
}
@Override
public void putAll(Map<? extends String, ? extends List<String>> map) {
this.headers.putAll(map);
}
@Override
public void clear() {
this.headers.clear();
}
@Override
public Set<String> keySet() {
return this.headers.keySet();
}
@Override
public Collection<List<String>> values() {
return this.headers.values();
}
@Override
public Set<Entry<String, List<String>>> entrySet() {
return this.headers.entrySet();
}
@Override
public boolean equals(@Nullable Object other) {
return (this == other || (other instanceof StompHeaders &&
this.headers.equals(((StompHeaders) other).headers)));
}
@Override
public int hashCode() {
return this.headers.hashCode();
}
@Override
public String toString() {
return this.headers.toString();
}
/**
* Return a {@code StompHeaders} object that can only be read, not written to.
*/
public static StompHeaders readOnlyStompHeaders(@Nullable Map<String, List<String>> headers) {
return new StompHeaders((headers != null ? headers : Collections.emptyMap()), true);
}
}
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