/*
* Copyright 2002-2016 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
*
* 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 org.springframework.http;
import java.lang.reflect.Type;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.Arrays;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ObjectUtils;
/**
* Extension of {@link HttpEntity} that adds a {@linkplain HttpMethod method} and
* {@linkplain URI uri}.
* Used in {@code RestTemplate} and {@code @Controller} methods.
*
* <p>In {@code RestTemplate}, this class is used as parameter in
* {@link org.springframework.web.client.RestTemplate#exchange(RequestEntity, Class) exchange()}:
* <pre class="code">
* MyRequest body = ...
* RequestEntity<MyRequest> request = RequestEntity.post(new URI("http://example.com/bar")).accept(MediaType.APPLICATION_JSON).body(body);
* ResponseEntity<MyResponse> response = template.exchange(request, MyResponse.class);
* </pre>
*
* <p>If you would like to provide a URI template with variables, consider using
* {@link org.springframework.web.util.UriTemplate}:
* <pre class="code">
* URI uri = new UriTemplate("http://example.com/{foo}").expand("bar");
* RequestEntity<MyRequest> request = RequestEntity.post(uri).accept(MediaType.APPLICATION_JSON).body(body);
* </pre>
*
* <p>Can also be used in Spring MVC, as a parameter in a @Controller method:
* <pre class="code">
* @RequestMapping("/handle")
* public void handle(RequestEntity<String> request) {
* HttpMethod method = request.getMethod();
* URI url = request.getUrl();
* String body = request.getBody();
* }
* </pre>
*
* @author Arjen Poutsma
* @author Sebastien Deleuze
* @since 4.1
* @see #getMethod()
* @see #getUrl()
*/
public class RequestEntity<T> extends HttpEntity<T> {
private final HttpMethod method;
private final URI url;
private final Type type;
/**
* Constructor with method and URL but without body nor headers.
* @param method the method
* @param url the URL
*/
public RequestEntity(HttpMethod method, URI url) {
this(null, null, method, url);
}
/**
* Constructor with method, URL and body but without headers.
* @param body the body
* @param method the method
* @param url the URL
*/
public RequestEntity(T body, HttpMethod method, URI url) {
this(body, null, method, url, null);
}
/**
* Constructor with method, URL, body and type but without headers.
* @param body the body
* @param method the method
* @param url the URL
* @param type the type used for generic type resolution
* @since 4.3
*/
public RequestEntity(T body, HttpMethod method, URI url, Type type) {
this(body, null, method, url, type);
}
/**
* Constructor with method, URL and headers but without body.
* @param headers the headers
* @param method the method
* @param url the URL
*/
public RequestEntity(MultiValueMap<String, String> headers, HttpMethod method, URI url) {
this(null, headers, method, url, null);
}
/**
* Constructor with method, URL, headers and body.
* @param body the body
* @param headers the headers
* @param method the method
* @param url the URL
*/
public RequestEntity(T body, MultiValueMap<String, String> headers, HttpMethod method, URI url) {
this(body, headers, method, url, null);
}
/**
* Constructor with method, URL, headers, body and type.
* @param body the body
* @param headers the headers
* @param method the method
* @param url the URL
* @param type the type used for generic type resolution
* @since 4.3
*/
public RequestEntity(T body, MultiValueMap<String, String> headers, HttpMethod method, URI url, Type type) {
super(body, headers);
this.method = method;
this.url = url;
this.type = type;
}
/**
* Return the HTTP method of the request.
* @return the HTTP method as an {@code HttpMethod} enum value
*/
public HttpMethod getMethod() {
return this.method;
}
/**
* Return the URL of the request.
* @return the URL as a {@code URI}
*/
public URI getUrl() {
return this.url;
}
/**
* Return the type of the request's body.
* @return the request's body type, or {@code null} if not known
* @since 4.3
*/
public Type getType() {
if (this.type == null) {
T body = getBody();
if (body != null) {
return body.getClass();
}
}
return this.type;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!super.equals(other)) {
return false;
}
RequestEntity<?> otherEntity = (RequestEntity<?>) other;
return (ObjectUtils.nullSafeEquals(getMethod(), otherEntity.getMethod()) &&
ObjectUtils.nullSafeEquals(getUrl(), otherEntity.getUrl()));
}
@Override
public int hashCode() {
int hashCode = super.hashCode();
hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.method);
hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.url);
return hashCode;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder("<");
builder.append(getMethod());
builder.append(' ');
builder.append(getUrl());
builder.append(',');
T body = getBody();
HttpHeaders headers = getHeaders();
if (body != null) {
builder.append(body);
if (headers != null) {
builder.append(',');
}
}
if (headers != null) {
builder.append(headers);
}
builder.append('>');
return builder.toString();
}
// Static builder methods
/**
* Create a builder with the given method and url.
* @param method the HTTP method (GET, POST, etc)
* @param url the URL
* @return the created builder
*/
public static BodyBuilder method(HttpMethod method, URI url) {
return new DefaultBodyBuilder(method, url);
}
/**
* Create an HTTP GET builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder<?> get(URI url) {
return method(HttpMethod.GET, url);
}
/**
* Create an HTTP HEAD builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder<?> head(URI url) {
return method(HttpMethod.HEAD, url);
}
/**
* Create an HTTP POST builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder post(URI url) {
return method(HttpMethod.POST, url);
}
/**
* Create an HTTP PUT builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder put(URI url) {
return method(HttpMethod.PUT, url);
}
/**
* Create an HTTP PATCH builder with the given url.
* @param url the URL
* @return the created builder
*/
public static BodyBuilder patch(URI url) {
return method(HttpMethod.PATCH, url);
}
/**
* Create an HTTP DELETE builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder<?> delete(URI url) {
return method(HttpMethod.DELETE, url);
}
/**
* Creates an HTTP OPTIONS builder with the given url.
* @param url the URL
* @return the created builder
*/
public static HeadersBuilder<?> options(URI url) {
return method(HttpMethod.OPTIONS, url);
}
/**
* Defines a builder that adds headers to the request entity.
* @param <B> the builder subclass
*/
public interface HeadersBuilder<B extends HeadersBuilder<B>> {
/**
* Add the given, single header value under the given name.
* @param headerName the header name
* @param headerValues the header value(s)
* @return this builder
* @see HttpHeaders#add(String, String)
*/
B header(String headerName, String... headerValues);
/**
* Set the list of acceptable {@linkplain MediaType media types}, as
* specified by the {@code Accept} header.
* @param acceptableMediaTypes the acceptable media types
*/
B accept(MediaType... acceptableMediaTypes);
/**
* Set the list of acceptable {@linkplain Charset charsets}, as specified
* by the {@code Accept-Charset} header.
* @param acceptableCharsets the acceptable charsets
*/
B acceptCharset(Charset... acceptableCharsets);
/**
* Set the value of the {@code If-Modified-Since} header.
* <p>The date should be specified as the number of milliseconds since
* January 1, 1970 GMT.
* @param ifModifiedSince the new value of the header
*/
B ifModifiedSince(long ifModifiedSince);
/**
* Set the values of the {@code If-None-Match} header.
* @param ifNoneMatches the new value of the header
*/
B ifNoneMatch(String... ifNoneMatches);
/**
* Builds the request entity with no body.
* @return the request entity
* @see BodyBuilder#body(Object)
*/
RequestEntity<Void> build();
}
/**
* Defines a builder that adds a body to the response entity.
*/
public interface BodyBuilder extends HeadersBuilder<BodyBuilder> {
/**
* Set the length of the body in bytes, as specified by the
* {@code Content-Length} header.
* @param contentLength the content length
* @return this builder
* @see HttpHeaders#setContentLength(long)
*/
BodyBuilder contentLength(long contentLength);
/**
* Set the {@linkplain MediaType media type} of the body, as specified
* by the {@code Content-Type} header.
* @param contentType the content type
* @return this builder
* @see HttpHeaders#setContentType(MediaType)
*/
BodyBuilder contentType(MediaType contentType);
/**
* Set the body of the request entity and build the RequestEntity.
* @param <T> the type of the body
* @param body the body of the request entity
* @return the built request entity
*/
<T> RequestEntity<T> body(T body);
/**
* Set the body and type of the request entity and build the RequestEntity.
* @param <T> the type of the body
* @param body the body of the request entity
* @param type the type of the body, useful for generic type resolution
* @return the built request entity
* @since 4.3
*/
<T> RequestEntity<T> body(T body, Type type);
}
private static class DefaultBodyBuilder implements BodyBuilder {
private final HttpMethod method;
private final URI url;
private final HttpHeaders headers = new HttpHeaders();
public DefaultBodyBuilder(HttpMethod method, URI url) {
this.method = method;
this.url = url;
}
@Override
public BodyBuilder header(String headerName, String... headerValues) {
for (String headerValue : headerValues) {
this.headers.add(headerName, headerValue);
}
return this;
}
@Override
public BodyBuilder accept(MediaType... acceptableMediaTypes) {
this.headers.setAccept(Arrays.asList(acceptableMediaTypes));
return this;
}
@Override
public BodyBuilder acceptCharset(Charset... acceptableCharsets) {
this.headers.setAcceptCharset(Arrays.asList(acceptableCharsets));
return this;
}
@Override
public BodyBuilder contentLength(long contentLength) {
this.headers.setContentLength(contentLength);
return this;
}
@Override
public BodyBuilder contentType(MediaType contentType) {
this.headers.setContentType(contentType);
return this;
}
@Override
public BodyBuilder ifModifiedSince(long ifModifiedSince) {
this.headers.setIfModifiedSince(ifModifiedSince);
return this;
}
@Override
public BodyBuilder ifNoneMatch(String... ifNoneMatches) {
this.headers.setIfNoneMatch(Arrays.asList(ifNoneMatches));
return this;
}
@Override
public RequestEntity<Void> build() {
return new RequestEntity<>(this.headers, this.method, this.url);
}
@Override
public <T> RequestEntity<T> body(T body) {
return new RequestEntity<>(body, this.headers, this.method, this.url);
}
@Override
public <T> RequestEntity<T> body(T body, Type type) {
return new RequestEntity<>(body, this.headers, this.method, this.url, type);
}
}
}