/*
* Copyright 2002-2010 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 org.springframework.util.MultiValueMap;
/**
* Represents an HTTP request or response entity, consisting of headers and body.
*
* <p>Typically used in combination with the {@link org.springframework.web.client.RestTemplate RestTemplate}, like so:
* <pre class="code">
* HttpHeaders headers = new HttpHeaders();
* headers.setContentType(MediaType.TEXT_PLAIN);
* HttpEntity<String> entity = new HttpEntity<String>(helloWorld, headers);
* URI location = template.postForLocation("http://example.com", entity);
* </pre>
* or
* <pre class="code">
* HttpEntity<String> entity = template.getForEntity("http://example.com", String.class);
* String body = entity.getBody();
* MediaType contentType = entity.getHeaders().getContentType();
* </pre>
* Can also be used in Spring MVC, as a return value from a @Controller method:
* <pre class="code">
* @RequestMapping("/handle")
* public HttpEntity<String> handle() {
* HttpHeaders responseHeaders = new HttpHeaders();
* responseHeaders.set("MyResponseHeader", "MyValue");
* return new HttpEntity<String>("Hello World", responseHeaders);
* }
* </pre>
*
* @author Arjen Poutsma
* @since 3.0.2
* @see org.springframework.web.client.RestTemplate
* @see #getBody()
* @see #getHeaders()
*/
public class HttpEntity<T> {
/**
* The empty {@code HttpEntity}, with no body or headers.
*/
public static final HttpEntity EMPTY = new HttpEntity();
private final HttpHeaders headers;
private final T body;
/**
* Create a new, empty {@code HttpEntity}.
*/
protected HttpEntity() {
this(null, null);
}
/**
* Create a new {@code HttpEntity} with the given body and no headers.
* @param body the entity body
*/
public HttpEntity(T body) {
this(body, null);
}
/**
* Create a new {@code HttpEntity} with the given headers and no body.
* @param headers the entity headers
*/
public HttpEntity(MultiValueMap<String, String> headers) {
this(null, headers);
}
/**
* Create a new {@code HttpEntity} with the given body and headers.
* @param body the entity body
* @param headers the entity headers
*/
public HttpEntity(T body, MultiValueMap<String, String> headers) {
this.body = body;
HttpHeaders tempHeaders = new HttpHeaders();
if (headers != null) {
tempHeaders.putAll(headers);
}
this.headers = HttpHeaders.readOnlyHttpHeaders(tempHeaders);
}
/**
* Returns the headers of this entity.
*/
public HttpHeaders getHeaders() {
return this.headers;
}
/**
* Returns the body of this entity.
*/
public T getBody() {
return this.body;
}
/**
* Indicates whether this entity has a body.
*/
public boolean hasBody() {
return (this.body != null);
}
}
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