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Response.java
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/**
* Copyright 2012-2020 The Feign 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 feign;
import static feign.Util.*;
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.*;
/**
* An immutable response to an http invocation which only returns string content.
*/
public final class Response implements Closeable {
private final int status;
private final String reason;
private final Map<String, Collection<String>> headers;
private final Body body;
private final Request request;
private Response(Builder builder) {
checkState(builder.request != null, "original request is required");
this.status = builder.status;
this.request = builder.request;
this.reason = builder.reason; // nullable
this.headers = (builder.headers != null)
? Collections.unmodifiableMap(caseInsensitiveCopyOf(builder.headers))
: new LinkedHashMap<>();
this.body = builder.body; // nullable
}
public Builder toBuilder() {
return new Builder(this);
}
public static Builder builder() {
return new Builder();
}
public static final class Builder {
int status;
String reason;
Map<String, Collection<String>> headers;
Body body;
Request request;
private RequestTemplate requestTemplate;
Builder() {}
Builder(Response source) {
this.status = source.status;
this.reason = source.reason;
this.headers = source.headers;
this.body = source.body;
this.request = source.request;
}
/** @see Response#status */
public Builder status(int status) {
this.status = status;
return this;
}
/** @see Response#reason */
public Builder reason(String reason) {
this.reason = reason;
return this;
}
/** @see Response#headers */
public Builder headers(Map<String, Collection<String>> headers) {
this.headers = headers;
return this;
}
/** @see Response#body */
public Builder body(Body body) {
this.body = body;
return this;
}
/** @see Response#body */
public Builder body(InputStream inputStream, Integer length) {
this.body = InputStreamBody.orNull(inputStream, length);
return this;
}
/** @see Response#body */
public Builder body(byte[] data) {
this.body = ByteArrayBody.orNull(data);
return this;
}
/** @see Response#body */
public Builder body(String text, Charset charset) {
this.body = ByteArrayBody.orNull(text, charset);
return this;
}
/**
* @see Response#request
*/
public Builder request(Request request) {
checkNotNull(request, "request is required");
this.request = request;
return this;
}
/**
* The Request Template used for the original request.
*
* @param requestTemplate used.
* @return builder reference.
*/
@Experimental
public Builder requestTemplate(RequestTemplate requestTemplate) {
this.requestTemplate = requestTemplate;
return this;
}
public Response build() {
return new Response(this);
}
}
/**
* status code. ex {@code 200}
*
* See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html" >rfc2616</a>
*/
public int status() {
return status;
}
/**
* Nullable and not set when using http/2
*
* See https://github.com/http2/http2-spec/issues/202
*/
public String reason() {
return reason;
}
/**
* Returns a case-insensitive mapping of header names to their values.
*/
public Map<String, Collection<String>> headers() {
return headers;
}
/**
* if present, the response had a body
*/
public Body body() {
return body;
}
/**
* the request that generated this response
*/
public Request request() {
return request;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder("HTTP/1.1 ").append(status);
if (reason != null)
builder.append(' ').append(reason);
builder.append('\n');
for (String field : headers.keySet()) {
for (String value : valuesOrEmpty(headers, field)) {
builder.append(field).append(": ").append(value).append('\n');
}
}
if (body != null)
builder.append('\n').append(body);
return builder.toString();
}
@Override
public void close() {
Util.ensureClosed(body);
}
public interface Body extends Closeable {
/**
* length in bytes, if known. Null if unknown or greater than {@link Integer#MAX_VALUE}.
*
* <br>
* <br>
* <br>
* <b>Note</b><br>
* This is an integer as most implementations cannot do bodies greater than 2GB.
*/
Integer length();
/**
* True if {@link #asInputStream()} and {@link #asReader()} can be called more than once.
*/
boolean isRepeatable();
/**
* It is the responsibility of the caller to close the stream.
*/
InputStream asInputStream() throws IOException;
/**
* It is the responsibility of the caller to close the stream.
*/
Reader asReader(Charset charset) throws IOException;
}
private static final class InputStreamBody implements Response.Body {
private final InputStream inputStream;
private final Integer length;
private InputStreamBody(InputStream inputStream, Integer length) {
this.inputStream = inputStream;
this.length = length;
}
private static Body orNull(InputStream inputStream, Integer length) {
if (inputStream == null) {
return null;
}
return new InputStreamBody(inputStream, length);
}
@Override
public Integer length() {
return length;
}
@Override
public boolean isRepeatable() {
return false;
}
@Override
public InputStream asInputStream() {
return inputStream;
}
@Override
public Reader asReader(Charset charset) throws IOException {
checkNotNull(charset, "charset should not be null");
return new InputStreamReader(inputStream, charset);
}
@Override
public void close() throws IOException {
inputStream.close();
}
@Override
public String toString() {
try {
return new String(toByteArray(inputStream), UTF_8);
} catch (Exception e) {
return super.toString();
}
}
}
private static final class ByteArrayBody implements Response.Body {
private final byte[] data;
public ByteArrayBody(byte[] data) {
this.data = data;
}
private static Body orNull(byte[] data) {
if (data == null) {
return null;
}
return new ByteArrayBody(data);
}
private static Body orNull(String text, Charset charset) {
if (text == null) {
return null;
}
checkNotNull(charset, "charset");
return new ByteArrayBody(text.getBytes(charset));
}
@Override
public Integer length() {
return data.length;
}
@Override
public boolean isRepeatable() {
return true;
}
@Override
public InputStream asInputStream() throws IOException {
return new ByteArrayInputStream(data);
}
@Override
public Reader asReader(Charset charset) throws IOException {
checkNotNull(charset, "charset should not be null");
return new InputStreamReader(asInputStream(), charset);
}
@Override
public void close() throws IOException {}
@Override
public String toString() {
return decodeOrDefault(data, UTF_8, "Binary data");
}
}
private static Map<String, Collection<String>> caseInsensitiveCopyOf(Map<String, Collection<String>> headers) {
Map<String, Collection<String>> result =
new TreeMap<String, Collection<String>>(String.CASE_INSENSITIVE_ORDER);
for (Map.Entry<String, Collection<String>> entry : headers.entrySet()) {
String headerName = entry.getKey();
if (!result.containsKey(headerName)) {
result.put(headerName.toLowerCase(Locale.ROOT), new LinkedList<String>());
}
result.get(headerName).addAll(entry.getValue());
}
return result;
}
}