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/*
* Copyright 2013 Netflix, Inc.
*
* 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 java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import static feign.Util.UTF_8;
import static feign.Util.checkNotNull;
import static feign.Util.checkState;
import static feign.Util.decodeOrDefault;
import static feign.Util.valuesOrEmpty;
/**
* An immutable response to an http invocation which only returns string content.
*/
public final class Response {
private final int status;
private final String reason;
private final Map> headers;
private final Body body;
private Response(int status, String reason, Map> headers, Body body) {
checkState(status >= 200, "Invalid status code: %s", status);
this.status = status;
this.reason = checkNotNull(reason, "reason");
LinkedHashMap>
copyOf =
new LinkedHashMap>();
copyOf.putAll(checkNotNull(headers, "headers"));
this.headers = Collections.unmodifiableMap(copyOf);
this.body = body; //nullable
}
public static Response create(int status, String reason, Map> headers,
InputStream inputStream, Integer length) {
return new Response(status, reason, headers, InputStreamBody.orNull(inputStream, length));
}
public static Response create(int status, String reason, Map> headers,
byte[] data) {
return new Response(status, reason, headers, ByteArrayBody.orNull(data));
}
public static Response create(int status, String reason, Map> headers,
String text, Charset charset) {
return new Response(status, reason, headers, ByteArrayBody.orNull(text, charset));
}
public static Response create(int status, String reason, Map> headers,
Body body) {
return new Response(status, reason, headers, body);
}
/**
* status code. ex {@code 200}
*
* See rfc2616
*/
public int status() {
return status;
}
public String reason() {
return reason;
}
public Map> headers() {
return headers;
}
/**
* if present, the response had a body
*/
public Body body() {
return body;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("HTTP/1.1 ").append(status).append(' ').append(reason).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();
}
public interface Body extends Closeable {
/**
* length in bytes, if known. Null if not.
Note This is an integer as
* most implementations cannot do bodies greater than 2GB. Moreover, the scope of this interface
* doesn't include large bodies.
*/
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() 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() throws IOException {
return inputStream;
}
@Override
public Reader asReader() throws IOException {
return new InputStreamReader(inputStream, UTF_8);
}
@Override
public void close() throws IOException {
inputStream.close();
}
}
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() throws IOException {
return new InputStreamReader(asInputStream(), UTF_8);
}
@Override
public void close() throws IOException {
}
@Override
public String toString() {
return decodeOrDefault(data, UTF_8, "Binary data");
}
}
}
