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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.Closeable;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
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.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<String, Collection<String>> headers;
private final Body body;
public static Response create(int status, String reason, Map<String, Collection<String>> headers,
Reader chars, Integer length) {
return new Response(status, reason, headers, ReaderBody.orNull(chars, length));
}
public static Response create(int status, String reason, Map<String, Collection<String>> headers, String chars) {
return new Response(status, reason, headers, StringBody.orNull(chars));
}
private Response(int status, String reason, Map<String, Collection<String>> headers, Body body) {
checkState(status >= 200, "Invalid status code: %s", status);
this.status = status;
this.reason = checkNotNull(reason, "reason");
LinkedHashMap<String, Collection<String>> copyOf = new LinkedHashMap<String, Collection<String>>();
copyOf.putAll(checkNotNull(headers, "headers"));
this.headers = Collections.unmodifiableMap(copyOf);
this.body = body; //nullable
}
/**
* status code. ex {@code 200}
*
* See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html" >rfc2616</a>
*/
public int status() {
return status;
}
public String reason() {
return reason;
}
public Map<String, Collection<String>> headers() {
return headers;
}
/**
* if present, the response had a body
*/
public Body body() {
return body;
}
public interface Body extends Closeable {
/**
* length in bytes, if known. Null if not.
* <br>
* <br><br><b>Note</b><br> 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 #asReader()} can be called more than once.
*/
boolean isRepeatable();
/**
* It is the responsibility of the caller to close the stream.
*/
Reader asReader() throws IOException;
}
private static final class ReaderBody implements Response.Body {
private static Body orNull(Reader chars, Integer length) {
if (chars == null)
return null;
return new ReaderBody(chars, length);
}
private final Reader chars;
private final Integer length;
private ReaderBody(Reader chars, Integer length) {
this.chars = chars;
this.length = length;
}
@Override public Integer length() {
return length;
}
@Override public boolean isRepeatable() {
return false;
}
@Override public Reader asReader() throws IOException {
return chars;
}
@Override public void close() throws IOException {
chars.close();
}
}
private static final class StringBody implements Response.Body {
private static Body orNull(String chars) {
if (chars == null)
return null;
return new StringBody(chars);
}
private final String chars;
public StringBody(String chars) {
this.chars = chars;
}
private volatile Integer length;
@Override public Integer length() {
if (length == null) {
length = chars.getBytes(UTF_8).length;
}
return length;
}
@Override public boolean isRepeatable() {
return true;
}
@Override public Reader asReader() throws IOException {
return new StringReader(chars);
}
public String toString() {
return chars;
}
@Override public void close() {
}
}
@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();
}
}