InputStreamResponseHandler.java

//------------------------------------------------------------------------------
// Copyright (c) 2012 Microsoft Corporation. All rights reserved.
//
// Description: See the class level JavaDoc comments.
//------------------------------------------------------------------------------

package com.microsoft.live;

import java.io.IOException;
import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.util.EntityUtils;

/**
 * InputStreamResponseHandler returns an InputStream from an HttpResponse.
 * Singleton--use INSTANCE.
 */
enum InputStreamResponseHandler implements ResponseHandler<InputStream> {
    INSTANCE;

    @Override
    public InputStream handleResponse(HttpResponse response) throws ClientProtocolException,
                                                                    IOException {
        HttpEntity entity = response.getEntity();
        StatusLine statusLine = response.getStatusLine();
        boolean successfulResponse = (statusLine.getStatusCode() / 100) == 2;
        if (!successfulResponse) {
            // If it was not a successful response, the response body contains a
            // JSON error message body. Unfortunately, I have to adhere to the interface
            // and I am throwing an IOException in this case.
            String responseBody = EntityUtils.toString(entity);
            throw new IOException(responseBody);
        }

        return entity.getContent();
    }
}