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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.codec.http;
import io.netty.util.AsciiString;
import static io.netty.util.internal.MathUtil.findNextPositivePowerOfTwo;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
/**
* The request method of HTTP or its derived protocols, such as
* RTSP and
* ICAP.
*/
public class HttpMethod implements Comparable {
/**
* The OPTIONS method represents a request for information about the communication options
* available on the request/response chain identified by the Request-URI. This method allows
* the client to determine the options and/or requirements associated with a resource, or the
* capabilities of a server, without implying a resource action or initiating a resource
* retrieval.
*/
public static final HttpMethod OPTIONS = new HttpMethod("OPTIONS");
/**
* The GET method means retrieve whatever information (in the form of an entity) is identified
* by the Request-URI. If the Request-URI refers to a data-producing process, it is the
* produced data which shall be returned as the entity in the response and not the source text
* of the process, unless that text happens to be the output of the process.
*/
public static final HttpMethod GET = new HttpMethod("GET");
/**
* The HEAD method is identical to GET except that the server MUST NOT return a message-body
* in the response.
*/
public static final HttpMethod HEAD = new HttpMethod("HEAD");
/**
* The POST method is used to request that the origin server accept the entity enclosed in the
* request as a new subordinate of the resource identified by the Request-URI in the
* Request-Line.
*/
public static final HttpMethod POST = new HttpMethod("POST");
/**
* The PUT method requests that the enclosed entity be stored under the supplied Request-URI.
*/
public static final HttpMethod PUT = new HttpMethod("PUT");
/**
* The PATCH method requests that a set of changes described in the
* request entity be applied to the resource identified by the Request-URI.
*/
public static final HttpMethod PATCH = new HttpMethod("PATCH");
/**
* The DELETE method requests that the origin server delete the resource identified by the
* Request-URI.
*/
public static final HttpMethod DELETE = new HttpMethod("DELETE");
/**
* The TRACE method is used to invoke a remote, application-layer loop- back of the request
* message.
*/
public static final HttpMethod TRACE = new HttpMethod("TRACE");
/**
* This specification reserves the method name CONNECT for use with a proxy that can dynamically
* switch to being a tunnel
*/
public static final HttpMethod CONNECT = new HttpMethod("CONNECT");
private static final EnumNameMap methodMap;
static {
methodMap = new EnumNameMap(
new EnumNameMap.Node(OPTIONS.toString(), OPTIONS),
new EnumNameMap.Node(GET.toString(), GET),
new EnumNameMap.Node(HEAD.toString(), HEAD),
new EnumNameMap.Node(POST.toString(), POST),
new EnumNameMap.Node(PUT.toString(), PUT),
new EnumNameMap.Node(PATCH.toString(), PATCH),
new EnumNameMap.Node(DELETE.toString(), DELETE),
new EnumNameMap.Node(TRACE.toString(), TRACE),
new EnumNameMap.Node(CONNECT.toString(), CONNECT));
}
/**
* Returns the {@link HttpMethod} represented by the specified name.
* If the specified name is a standard HTTP method name, a cached instance
* will be returned. Otherwise, a new instance will be returned.
*/
public static HttpMethod valueOf(String name) {
HttpMethod result = methodMap.get(name);
return result != null ? result : new HttpMethod(name);
}
private final AsciiString name;
/**
* Creates a new HTTP method with the specified name. You will not need to
* create a new method unless you are implementing a protocol derived from
* HTTP, such as
* RTSP and
* ICAP
*/
public HttpMethod(String name) {
name = checkNotNull(name, "name").trim();
if (name.isEmpty()) {
throw new IllegalArgumentException("empty name");
}
for (int i = 0; i < name.length(); i ++) {
char c = name.charAt(i);
if (Character.isISOControl(c) || Character.isWhitespace(c)) {
throw new IllegalArgumentException("invalid character in name");
}
}
this.name = AsciiString.cached(name);
}
/**
* Returns the name of this method.
*/
public String name() {
return name.toString();
}
/**
* Returns the name of this method.
*/
public AsciiString asciiName() {
return name;
}
@Override
public int hashCode() {
return name().hashCode();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof HttpMethod)) {
return false;
}
HttpMethod that = (HttpMethod) o;
return name().equals(that.name());
}
@Override
public String toString() {
return name.toString();
}
@Override
public int compareTo(HttpMethod o) {
if (o == this) {
return 0;
}
return name().compareTo(o.name());
}
private static final class EnumNameMap {
private final EnumNameMap.Node[] values;
private final int valuesMask;
EnumNameMap(EnumNameMap.Node... nodes) {
values = (EnumNameMap.Node[]) new EnumNameMap.Node[findNextPositivePowerOfTwo(nodes.length)];
valuesMask = values.length - 1;
for (EnumNameMap.Node node : nodes) {
int i = hashCode(node.key) & valuesMask;
if (values[i] != null) {
throw new IllegalArgumentException("index " + i + " collision between values: [" +
values[i].key + ", " + node.key + ']');
}
values[i] = node;
}
}
T get(String name) {
EnumNameMap.Node node = values[hashCode(name) & valuesMask];
return node == null || !node.key.equals(name) ? null : node.value;
}
private static int hashCode(String name) {
// This hash code needs to produce a unique index in the "values" array for each HttpMethod. If new
// HttpMethods are added this algorithm will need to be adjusted. The constructor will "fail fast" if there
// are duplicates detected.
// For example with the current set of HttpMethods it just so happens that the String hash code value
// shifted right by 6 bits modulo 16 is unique relative to all other HttpMethod values.
return name.hashCode() >>> 6;
}
private static final class Node {
final String key;
final T value;
Node(String key, T value) {
this.key = key;
this.value = value;
}
}
}
}
