piramide.multimodal.downloader.client.RestClient.java Source code

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Here is the source code for piramide.multimodal.downloader.client.RestClient.java

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/*
 * Copyright (C) 2010 PIRAmIDE-SP3 authors
 *
 * 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.
 * 
 * This software consists of contributions made by many individuals, 
 * listed below:
 *
 * Author: Aitor Almeida <aitor.almeida@deusto.es>
 *         Pablo Ordua <pablo.orduna@deusto.es>
 *         Eduardo Castillejo <eduardo.castillejo@deusto.es>
 *
 */
package piramide.multimodal.downloader.client;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;

import android.content.Context;

public class RestClient {

    private final URLBuilder urlBuilder;
    private final Context activity;

    public RestClient(Context context) {
        this.urlBuilder = new URLBuilder(context);
        this.activity = context;
    }

    public String[] listApplications() throws DownloaderException {
        final String url = this.urlBuilder.buildApplicationsURL();
        return json2list(url);
    }

    public String[] listVersions(String application) throws DownloaderException {
        final String url = this.urlBuilder.buildVersionsURL(application);
        return json2list(url);
    }

    public void downloadAndInstallApplication(String application, String version, Map<String, Object> userVariables)
            throws DownloaderException {
        final String applicationURL = this.urlBuilder.buildApplicationURL(application, version, userVariables);
        final ApplicationDownloader downloader = new ApplicationDownloader(this.activity, applicationURL);
        downloader.download();
        downloader.install();
    }

    private String[] json2list(String url) throws DownloaderException {
        try {
            final HttpClient client = new DefaultHttpClient();
            final HttpResponse response = client.execute(new HttpGet(url));
            final InputStream is = response.getEntity().getContent();
            final int size = (int) response.getEntity().getContentLength();
            final byte[] buffer = new byte[size];
            final BufferedInputStream bis = new BufferedInputStream(is);
            int position = 0;
            while (position < size) {
                final int read = bis.read(buffer, position, buffer.length - position);
                if (read <= 0)
                    break;
                position += read;
            }

            final String strResponse = new String(buffer);
            final JSONArray arr = new JSONArray(strResponse);
            final String[] returnValue = new String[arr.length()];

            for (int i = 0; i < arr.length(); ++i)
                returnValue[i] = arr.getString(i);

            return returnValue;
        } catch (ClientProtocolException e) {
            throw new DownloaderException(e.getMessage(), e);
        } catch (IllegalStateException e) {
            throw new DownloaderException(e.getMessage(), e);
        } catch (IOException e) {
            throw new DownloaderException(e.getMessage(), e);
        } catch (JSONException e) {
            throw new DownloaderException(e.getMessage(), e);
        }
    }
}