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Response.java
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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 com.google.common.base.Objects;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableListMultimap;
import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Map.Entry;
import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.base.Objects.equal;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
/**
* 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 ImmutableListMultimap<String, String> headers;
private final Optional<Body> body;
public static Response create(int status, String reason, ImmutableListMultimap<String, String> headers,
Reader chars, Integer length) {
return new Response(status, reason, headers, Optional.fromNullable(ReaderBody.orNull(chars, length)));
}
public static Response create(int status, String reason, ImmutableListMultimap<String, String> headers, String chars) {
return new Response(status, reason, headers, Optional.fromNullable(StringBody.orNull(chars)));
}
private Resp
8000
onse(int status, String reason, ImmutableListMultimap<String, String> headers, Optional<Body> body) {
checkState(status >= 200, "Invalid status code: %s", status);
this.status = status;
this.reason = checkNotNull(reason, "reason");
this.headers = checkNotNull(headers, "headers");
this.body = checkNotNull(body, "body");
}
/**
* status code. ex {@code 200}
*
* @see <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html" />
*/
public int status() {
return status;
}
public String reason() {
return reason;
}
public ImmutableListMultimap<String, String> headers() {
return headers;
}
public Optional<Body> body() {
return body;
}
public interface Body extends Closeable {
/**
* length in bytes, if known.
* <p/>
* <h4>Note</h4> This is an integer as most implementations cannot do
* bodies > 2GB. Moreover, the scope of this interface doesn't include
* large bodies.
*/
Optional<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, Optional.fromNullable(length));
}
private final Reader chars;
private final Optional<Integer> length;
private ReaderBody(Reader chars, Optional<Integer> length) {
this.chars = chars;
this.length = length;
}
@Override public Optional<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 Optional<Integer> length;
@Override public Optional<Integer> length() {
if (length == null) {
length = Optional.of(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 int hashCode() {
return Objects.hashCode(status, reason, headers, body);
}
@Override public boolean equals(Object obj) {
if (this == obj)
return true;
if (Response.class != obj.getClass())
return false;
Response that = Response.class.cast(obj);
return equal(this.status, that.status) && equal(this.reason, that.reason) && equal(this.headers, that.headers)
&& equal(this.body, that.body);
}
@Override public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("HTTP/1.1 ").append(status).append(' ').append(reason).append('\n');
for (Entry<String, String> header : headers.entries()) {
builder.append(header.getKey()).append(": ").append(header.getValue()).append('\n');
}
if (body.isPresent()) {
builder.append('\n').append(body.get());
}
return builder.toString();
}
}