com.sepgil.ral.DrupalOperationTask.java Source code

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Here is the source code for com.sepgil.ral.DrupalOperationTask.java

Source

package com.sepgil.ral;

/**
 * This file is part of RestWS Android Library (RAL).
 * RAL is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * RAL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with RAL.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpRequestBase;
import org.json.JSONException;
import org.json.JSONObject;

import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.util.Log;

/**
 * Basic implementation of an operation for a Drupal site.
 * The class itself is extends on AsyncTask, so it takes care of performing operations in background.
 * @author Sebastian Gilits
 *
 */
public abstract class DrupalOperationTask extends AsyncTask<Endpoint, Void, HttpResponse>
        implements DrupalOperationInterface {

    @Override
    protected HttpResponse doInBackground(Endpoint... endpoints) {
        HttpResponse response = null;
        // If there is no Endpoint or we don't need to continue.
        if (endpoints.length == 0 && endpoints[0] == null) {
            onHttpError(null);
            return response;
        }
        // We only use the first endpoint, since we only want to perform the task on one site.
        Endpoint endpoint = endpoints[0];

        AndroidHttpClient client = AndroidHttpClient.newInstance("Android");

        // Request a new HTTPRequest and generate a path.
        HttpRequestBase request = getHttpRequest(endpoint.getUri() + getPath());
        // Add authentication and content type headers.
        request.setHeader("Authorization", "Basic " + endpoint.getAuth());
        request.setHeader("Content-Type", "application/json");
        request.setHeader("Accept", "application/json");

        try {
            // and try to execute the request.
            response = client.execute(request);
        } catch (IOException e) {
            onHttpError(null);
        }
        // AndroidHttpClient's need to be closed.
        client.close();
        return response;
    }

    @Override
    protected void onPostExecute(HttpResponse response) {
        // If there was no response, something may be wrong, since RestWS always returns something.
        if (response == null) {
            Log.w("DrupalCom", "Didn't get any response.");
            onHttpError(null);
            return;
        }

        int state = response.getStatusLine().getStatusCode();

        switch (state) {
        case HttpStatus.SC_CREATED:
        case HttpStatus.SC_OK:
            parseResponse(response.getEntity());
            return;
        default:
            onHttpError(response.getStatusLine());
            Log.w("DrupalCom", "Status code not ok: " + response.getStatusLine().getReasonPhrase());
            return;
        }
    }

    /**
     * Tries to parse the response to a JSON object.
     * @param httpEntity
     */
    private void parseResponse(HttpEntity httpEntity) {
        BufferedReader reader;
        String line, rawJson = "";
        // Read the input from the httpEntity and save it to a string.
        try {
            reader = new BufferedReader(new InputStreamReader(httpEntity.getContent()));
            while ((line = reader.readLine()) != null) {
                rawJson += line;
            }
        } catch (IllegalStateException stateException) {
            Log.w("DrupalCom", "IllegalStateException while reading input stream.");
            onParserError(stateException);
        } catch (IOException ioException) {
            Log.w("DrupalCom", "IO Error while reading input stream.");
            onParserError(ioException);
        }
        // Check if the content type is correct.
        String contentType = httpEntity.getContentType().getValue();
        try {
            if (contentType.equals("application/json")) {
                // Parse the string to a json object.
                JSONObject response = new JSONObject(rawJson);
                onResponse(response);
            } else {
                Log.w("DrupalCom", "Got not json but " + contentType);
                onJSONError(null);
            }
        } catch (JSONException e) {
            onJSONError(e);
        }
    }
}