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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty;

import static io.netty.handler.codec.http.HttpHeaders.Names.*;
import static org.asynchttpclient.util.HttpUtils.*;
import static org.asynchttpclient.util.MiscUtils.isNonEmpty;
import io.netty.handler.codec.http.HttpHeaders;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.asynchttpclient.HttpResponseBodyPart;
import org.asynchttpclient.HttpResponseHeaders;
import org.asynchttpclient.HttpResponseStatus;
import org.asynchttpclient.Response;
import org.asynchttpclient.cookie.Cookie;
import org.asynchttpclient.cookie.CookieDecoder;
import org.asynchttpclient.uri.Uri;

/**
 * Wrapper around the {@link org.asynchttpclient.Response} API.
 */
public class NettyResponse implements Response {

    private final List bodyParts;
    private final HttpResponseHeaders headers;
    private final HttpResponseStatus status;
    private List cookies;

    public NettyResponse(HttpResponseStatus status,//
            HttpResponseHeaders headers,//
            List bodyParts) {
        this.bodyParts = bodyParts;
        this.headers = headers;
        this.status = status;
    }

    private List buildCookies() {

        List setCookieHeaders = headers.getHeaders().getAll(SET_COOKIE2);

        if (!isNonEmpty(setCookieHeaders)) {
            setCookieHeaders = headers.getHeaders().getAll(SET_COOKIE);
        }

        if (isNonEmpty(setCookieHeaders)) {
            List cookies = new ArrayList<>(1);
            for (String value : setCookieHeaders) {
                Cookie c = CookieDecoder.decode(value);
                if (c != null)
                    cookies.add(c);
            }
            return Collections.unmodifiableList(cookies);
        }

        return Collections.emptyList();
    }

    @Override
    public final int getStatusCode() {
        return status.getStatusCode();
    }

    @Override
    public final String getStatusText() {
        return status.getStatusText();
    }

    @Override
    public final Uri getUri() {
        return status.getUri();
    }

    @Override
    public SocketAddress getRemoteAddress() {
        return status.getRemoteAddress();
    }

    @Override
    public SocketAddress getLocalAddress() {
        return status.getLocalAddress();
    }

    @Override
    public final String getContentType() {
        return headers != null ? getHeader(CONTENT_TYPE) : null;
    }

    @Override
    public final String getHeader(String name) {
        return headers != null ? getHeaders().get(name) : null;
    }

    @Override
    public final List getHeaders(String name) {
        return headers != null ? getHeaders().getAll(name) : Collections. emptyList();
    }

    @Override
    public final HttpHeaders getHeaders() {
        return headers != null ? headers.getHeaders() : HttpHeaders.EMPTY_HEADERS;
    }

    @Override
    public final boolean isRedirected() {
        switch (status.getStatusCode()) {
        case 301:
        case 302:
        case 303:
        case 307:
        case 308:
            return true;
        default:
            return false;
        }
    }

    @Override
    public List getCookies() {

        if (headers == null) {
            return Collections.emptyList();
        }

        if (cookies == null) {
            cookies = buildCookies();
        }
        return cookies;

    }

    @Override
    public boolean hasResponseStatus() {
        return status != null;
    }

    @Override
    public boolean hasResponseHeaders() {
        return headers != null && !headers.getHeaders().isEmpty();
    }

    @Override
    public boolean hasResponseBody() {
        return isNonEmpty(bodyParts);
    }

    @Override
    public byte[] getResponseBodyAsBytes() {
        return getResponseBodyAsByteBuffer().array();
    }

    @Override
    public ByteBuffer getResponseBodyAsByteBuffer() {

        int length = 0;
        for (HttpResponseBodyPart part : bodyParts)
            length += part.length();

        ByteBuffer target = ByteBuffer.wrap(new byte[length]);
        for (HttpResponseBodyPart part : bodyParts)
            target.put(part.getBodyPartBytes());

        return target;
    }

    @Override
    public String getResponseBody() {
        return getResponseBody(null);
    }

    private Charset computeCharset(Charset charset) {

        if (charset == null) {
            String contentType = getContentType();
            if (contentType != null)
                charset = parseCharset(contentType); // parseCharset can return
                                                     // null
        }
        return charset != null ? charset : DEFAULT_CHARSET;
    }

    @Override
    public String getResponseBody(Charset charset) {
        return new String(getResponseBodyAsBytes(), computeCharset(charset));
    }

    @Override
    public InputStream getResponseBodyAsStream() {
        return new ByteArrayInputStream(getResponseBodyAsBytes());
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName()).append(" {\n")//
                .append("\tstatusCode=").append(getStatusCode()).append("\n")//
                .append("\theaders=\n");

        for (Map.Entry header : getHeaders()) {
            sb.append("\t\t").append(header.getKey()).append(": ").append(header.getValue()).append("\n");
        }
        sb.append("\tbody=\n").append(getResponseBody()).append("\n")//
                .append("}").toString();
        return sb.toString();
    }
}