com.microsoft.services.sharepoint.http.FroyoHttpConnection.java Source code

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Here is the source code for com.microsoft.services.sharepoint.http.FroyoHttpConnection.java

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/*******************************************************************************
 * Copyright (c) Microsoft Open Technologies, Inc.
 * All Rights Reserved
 * See License.txt in the project root for license information.
 ******************************************************************************/
package com.microsoft.services.sharepoint.http;

import java.io.IOException;
import java.io.InputStream;
import java.net.SocketTimeoutException;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.message.BasicHttpEntityEnclosingRequest;

import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import com.microsoft.services.sharepoint.Platform;

import android.annotation.SuppressLint;
import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.os.Build;

/**
 * Froyo HttpConnection implementation, based on AndroidHttpClient and AsyncTask
 * for async operations
 */
public class FroyoHttpConnection implements HttpConnection {

    @Override
    public ListenableFuture<Response> execute(final Request request) {

        final SettableFuture<Response> future = SettableFuture.create();

        final RequestTask requestTask = new RequestTask() {

            AndroidHttpClient mClient;
            InputStream mResponseStream;

            @Override
            protected Void doInBackground(Void... voids) {
                if (request == null) {
                    future.setException(new IllegalArgumentException("request"));
                }

                mClient = AndroidHttpClient.newInstance(Platform.getUserAgent());
                mResponseStream = null;
                URI uri;

                try {
                    HttpRequest realRequest = createRealRequest(request);
                    assert request != null;
                    uri = new URI(request.getUrl());

                    HttpHost host = new HttpHost(uri.getHost(), uri.getPort(), uri.getScheme());

                    HttpResponse response;

                    try {
                        response = mClient.execute(host, realRequest);
                    } catch (SocketTimeoutException timeoutException) {
                        closeStreamAndClient();
                        future.setException(timeoutException);
                        return null;
                    }

                    mResponseStream = response.getEntity().getContent();
                    Header[] headers = response.getAllHeaders();
                    Map<String, List<String>> headersMap = new HashMap<String, List<String>>();
                    for (Header header : headers) {
                        String headerName = header.getName();
                        if (headersMap.containsKey(headerName)) {
                            headersMap.get(headerName).add(header.getValue());
                        } else {
                            List<String> headerValues = new ArrayList<String>();
                            headerValues.add(header.getValue());
                            headersMap.put(headerName, headerValues);
                        }
                    }

                    future.set(new StreamResponse(mResponseStream, response.getStatusLine().getStatusCode(),
                            headersMap));
                    closeStreamAndClient();
                } catch (Exception e) {
                    closeStreamAndClient();

                    future.setException(e);
                }

                return null;
            }

            protected void closeStreamAndClient() {
                if (mResponseStream != null) {
                    try {
                        mResponseStream.close();
                    } catch (IOException e) {
                    }
                }

                if (mClient != null) {
                    mClient.close();
                }
            }
        };

        Futures.addCallback(future, new FutureCallback<Response>() {
            @Override
            public void onFailure(Throwable arg0) {
                requestTask.closeStreamAndClient();

            }

            @Override
            public void onSuccess(Response response) {
            }
        });

        executeTask(requestTask);

        return future;
    }

    @SuppressLint("NewApi")
    private void executeTask(AsyncTask<Void, Void, Void> task) {
        // If it's running with Honeycomb or greater, it must execute each
        // request in a different thread
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        } else {
            task.execute();
        }
    }

    /**
     * Internal class to represent an async operation that can close a stream
     */
    private abstract class RequestTask extends AsyncTask<Void, Void, Void> {

        /**
         * Closes the internal stream and http client, if they exist
         */
        abstract protected void closeStreamAndClient();
    }

    /**
     * Creates a request that can be accepted by the AndroidHttpClient
     * 
     * @param request
     *            The request information
     */
    private static BasicHttpEntityEnclosingRequest createRealRequest(Request request) {
        BasicHttpEntityEnclosingRequest realRequest = new BasicHttpEntityEnclosingRequest(request.getVerb(),
                request.getUrl());

        if (request.getContent() != null) {
            realRequest.setEntity(new ByteArrayEntity(request.getContent()));
        }

        Map<String, String> headers = request.getHeaders();

        for (String key : headers.keySet()) {
            realRequest.addHeader(key, headers.get(key));
        }

        return realRequest;
    }
}